Precision Rolling Bearings

Transcription

1 R Pecision Rolling Beaings CAT. No. 226-^/E

2 C O N T E N T S Technical Data NTN PRECISION ROLLING BEARINGS Main Spindle Beaings Ball Scew Suppot Beaings NTN PRODUCTS APPENDIX

3 1. Classification of Pecision Rolling Beaings fo Machine Tools 2 2. Beaing Selection and Shaft & Housing Design 5 3. Load Rating and Life Allowable Speed Beaing Aangements and Stuctues of Beaings fo Main Spindles Handling of Beaings Lubication of Beaings New Technologies Angula Contact Ball Beaings fo Radial Loads Cylindical Rolle Beaing Angula Contact Ball Beaings fo Axial Loads Tapeed Rolle Beaings Ball Scew Suppot Beaings NTN Poducts Cam followes fo pallet change Appendix 34

4 Waanty NTN waants, to the oiginal puchase only, that the deliveed poduct which is the subject of this sale (a) will confom to dawings and specifications mutually established in witing as applicable to the contact, and (b) be fee fom defects in mateial o fabication. The duation of this waanty is one yea fom date of delivey. If the buye discoves within this peiod a failue of the poduct to confom to dawings o specifications, o a defect in mateial o fabication, it must pomptly notify NTN in witing. In no event shall such notification be eceived by NTN late than 13 months fom the date of delivey. Within a easonable time afte such notification, NTN will, at its option, (a) coect any failue of the poduct to confom to dawings, specifications o any defect in mateial o wokmanship, with eithe eplacement o epai of the poduct, o (b) efund, in pat o in whole, the puchase pice. Such eplacement and epai, excluding chages fo labo, is at NTN's expense. All waanty sevice will be pefomed at sevice centes designated by NTN. These emedies ae the puchase's exclusive emedies fo beach of waanty. NTN does not waant (a) any poduct, components o pats not manufactued by NTN, (b) defects caused by failue to povide a suitable installation envionment fo the poduct, (c) damage caused by use of the poduct fo puposes othe than those fo which it was designed, (d) damage caused by disastes such as fie, flood, wind, and lightning, (e) damage caused by unauthoized attachments o modification, (f) damage duing shipment, o (g) any othe abuse o misuse by the puchase. THE FOREGOING WARRANTIES ARE IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. In no case shall NTN be liable fo any special, incidental, o consequential damages based upon beach of waanty, beach of contact, negligence, stict tot, o any othe legal theoy,and in no case shall total liability of NTN exceed the puchase pice of the pat upon which such liability is based. Such damages include, but ae not limited to, loss of pofits, loss of savings o evenue, loss of use of the poduct o any associated equipment, cost of capital, cost of any substitute equipment, facilities o sevices, downtime, the claims of thid paties including customes, and injuy to popety. Some states do not allow limits on waanties, o on emedies fo beach in cetain tansactions. In such states, the limits in this paagaph and in paagaph (2) shall apply to the extent allowable unde case law and statutes in such states. Any action fo beach of waanty o any othe legal theoy must be commenced within 15 months following delivey of the goods. Unless modified in a witing signed by both paties, this ageement is undestood to be the complete and exclusive ageement between the paties, supeceding all pio ageements, oal o witten, and all othe communications between the paties elating to the subject matte of this ageement. No employee of NTN o any othe paty is authoized to make any waanty in addition to those made in this ageement. This ageement allocates the isks of poduct failue between NTN and the puchase. This allocation is ecognized by both paties and is eflected in the pice of the goods. The puchase acknowledges that it has ead this ageement, undestands it, and is bound by its tems. NTN Copoation. 215 Although cae has been taken to assue the accuacy of the data compiled in this catalog, NTN does not assume any liability to any company o peson fo eos o omissions.

5 Pecision Rolling Beaings Page TECHNICAL DATA CONTENTS 1. Classification of Pecision Rolling Beaings fo Machine Tools 2 4 q Main spindle beaings 2 w Ball scew suppot beaings 4 2. Beaing Selection and Shaft & Housing Design 5 15 q Beaing selection 5 w Beaing accuacy 7 e Beaings and igidity 11 Designing beaing and housing Load Rating and Life q Beaing life 16 w Static load ating and allowable axial load 2 4. Allowable Speed Beaing Aangements and Stuctues of Beaings fo Main Spindles q Beaing aangement fo main spindles 22 w Beaing selection based on beaing aangement fo main spindle 24 e Adjustable peload beaing unit 25 Beaing jacket cooling system Handling of Beaings q Cleaning and filling with gease 27 w Mounting 28 e Tightening of inne ing 3 Elastic defomation of space esulting fom tightening foce 31 t Font cove dive-up 31 y Checking axial igidity 32 u Cleaance adjustment fo cylindical olle beaing 33 i Cylindical olle beaing tapeed boe and main spindle tape angle 37 o Running-in opeation fo main spindle beaing Lubication of Beaings q Gease lubication 4 w Ai-oil lubication 41 e Jet lubication New Technologies q The new seies of supe-high-speed pecision beaings fo machine tool main spindles "ULTAGE Seies" 48 w New mateial and new suface modification technology 48 e Envionmentally conscious technology 5 1

6 Technical Data 1. Classification of Pecision Rolling Beaings fo Machine Tools 1 Main spindle beaings Table.1 Types of pecision olling beaings fo machine tools Beaing type Angula contact ball beaing Double-ow cylindical olle beaing Standad High-speed Supe high-speed HSE with Lubication hole Eco-fiendly High-speed Standad Coss section Non-contact sealed type Non-contact sealed type Beaing type Beaing boe mm Contact angle Remaks Page 78C 79 (U), 5S-79 (U) 7 (U), 5S-7 (U) 72C 2LA-HSE9U 5S-2LA-HSE9 2LA-HSE 5S-2LA-HSE 5S-2LA-HSF 5S-2LA-HSL9U 5S-2LA-HSL 5S-2LA-HSFL 5S-2LA-HSEW9U 5S-2LA-HSEW 79 LLB 5S-79 LLB 7 LLB 5S-7 LLB 2LA-BNS9 LLB 5S-2LA-BNS9 LLB 2LA-BNS LLB 5S-2LA-BNS LLB BNT9 5S-BNT9 BNT 5S-BNT BNT2 5S-BNT2 NN49 (K) NN3 (K) NN3HS (K) NN3HST6 (K) NN3HSRT6 (K) NNU49 (K) , 25, 3 15, 25, , 2, , , 25 15, 25 15, 2, A beaing type code containing a suffix U means an ULTAGE seies beaing. Optimized inteio stuctue and esin cage help positively inhibit tempeatue ise (applicable to 79 and 7 types with boe diamete of 1 to 13 mm). Beaings with pefix 5S have ceamic balls. ULTAGE seies Use of special mateial and intoduction of suface modification contibute to much impoved wea esistance and anti-seizue popety. Optimized specifications fo the inteio stuctue lead to highe speed, igidity and eliability. Beaings with pefix 5S have ceamic balls. ULTAGE seies Maintaining the advantages of HSE type, this type has small diamete ceamic balls to achieve highe speed and limited heat buildup. Beaings with pefix 5S have ceamic balls. ULTAGE seies These beaings ae identical to the HSE and HSF types except in that they ae ai-oil lubication designs that have an eco-fiendly nozzle. Featuing lowe noise, educed ai and oil consumption, they positively impove opeating envionments and educe enegy consumption. Beaings with pefix 5S have ceamic balls. ULTAGE seies High speed angula contact ball beaings with lubication hole on oute ing, designed especially fo ai-oil lubication based on HSE type. These beaings have an effect on compact design and high igidity of spindle. Ai flow ate and oil consumption can be educed. Beaings with pefix 5S have ceamic balls. ULTAGE seies Featuing a two-side non-contact seal design and a special gease, these beaings ae a dedicated gease lubicated type that has achieved limited heat buildup though optimization of the inteio stuctue. Beaings with pefix 5S have ceamic balls. ULTAGE seies Maintaining the advantages of HSE type, this dedicated gease lubicated type has an impoved inteio design (gease esevoi, both -side non-contact seal and special gease) to extend gease life. Beaings with pefix 5S have ceamic balls. Angula contact ball beaing seies fo ginding machines/motos. All vaiants ae flush gound. Beaings with pefix 5S have ceamic balls. The beaing cleaance can be eithe intechangeable adial cleaance o non-intechangeable adial cleaance. A vaiant (K) is available with a tapeed boe to accommodate a tapeed shaft

7 Technical Data Beaing type Coss section Beaing type Beaing boe mm Contact angle Remaks Page Standad N1HS (K) 316 The bounday dimensions of the N1HS(K) high-speed single-ow cylindical olle beaing ae the same as those of the N1(K). Only the beaing cleaance is non-intechangeable. A ceamic-olle-type (5S-N1) is available on equest Single-ow cylindical olle beaing High-speed Eco-fiendly N1HSR (K) N1HSL (K) ULTAGE seies Optimized intenal design allows highe speed and esults in lowe tempeatue ise. The cage is made of a special esin to cope with a high-speed opeation. The allowable maximum speed is highe than that of the conventional high-speed cylindical olle beaing N1HS(K). ULTAGE seies This is a dedicated ai-oil lubicated type identical to the N1HSR(K) type except in that it incopoates an eco-fiendly nozzle. Still maintaining the high-speed pefomance of the N1HSR(K) type, this type boasts lowe noise, educed ai and oil consumption, and positively impoves opeating envionments and educes enegy consumption Plug gage Ring gage Tape gage Plug gage TA Ring gage TB Tape gage fo N1-HS(K) single-ow cylindical olle beaing and NN3(K) double-ow cylindical olle beaing. 238 SB 3516 Cleaance gage fo N1-HSK(K), N1-HSR(K) single-ow cylindical olle beaing and NN3(K), NN3HS(K) double-ow cylindicalolle beaing. 239 Cleaance adjustment gauge Adjustable peload beaing unit Adjustable peload beaing unit Fixed position adjustable peload beaing unit. Incopoation of an adjustable peload sleeve and a duplex angula ball beaing allows the use to adjust the peload of an angula ball beaing in a wide ange fom a light peload to a heavy peload. Fixed position peload leads to a geate igidity. Double-diection angula contact thust ball beaing 5629 (M) 562 (M) Small-size 132 Lage-size (M) 1433 Small-size 2532 Lage-size (M) The small beaing is used on a cylinde boe o smalle-diamete side of a tapeed boe of the NNU49, NN49 o NN3 double-ow cylindical olle beaing; the lage beaing (suffix M) is used on the lage hole side of a tapeed boe Angula contact ball beaing fo axial load HTA9U HTAU 5S-HTAU , 4 HTA9DB seies beaings ae fully compatible with 5629 seies beaings. HTADB seies beaings ae fully compatible with 562 seies beaings Tapeed olle beaings Nominal contact angle of 1 o geate, 17 o smalle Thin-wall type, ISO-compatible metic seies

8 Technical Data 2 Ball scew suppot beaings Beaing type Beaing type Beaing boe mm Contact angle Remaks Page Angula contact thust ball beaing fo ball scews BST 2A-BST Open type BST LXL/L588 2A-BST LXL/L588 Light-contact sealed type Coss section ULTAGE seies Suface modification teatment on the beaing ing aceways has led to a longe beaing life and much impoved fetting esistance. 288 Owing to pelubication with a special gease, the sealed type boasts a longe beaing life and simple maintenance wok. All vaiants ae flush-gound and ae povided with a standad peload HT 64 3 The allowable axial load of this beaing type is geate owing to the impoved inteio design. Angula contact ball beaing fo ball scews Needle olle beaings with double-diection thust needle olle beaing Cylindical olle beaings with double-diection thust needle olle beaing AXN ARN A cleaance emains between the inne ing of adial beaing and the inne ings of both thust beaings, allowing the use to detemine the peload by, fo example, tightening a nut etc. The tageted peload is attained based on the stating toque. The beaing cleaance on cetain peloaded beaings is contolled in advance so that an intended peload is attained by fully tightening the inne ings on both thust beaing with nuts, o equivalent means

9 Technical Data 2. Beaing Selection and Shaft & Housing Design 1 Beaing selection Geneally, the optimal beaing must be selected to suit the natue of the machine, the aea within the machine, the spindle specification, beaing type, lubication system and dive system of the intended machine though consideations of the design life, pecision, igidity and citical speed, etc. of the beaing. Table 2.1 summaizes a typical beaing selection pocedue, and Table 2.2 gives an example flowchat accoding to which consideations ae made to select an optimal main spindle beaing fo a machine tool. Table 2.1 Beaing selection pocedue Step Items being consideed Items being confimed Confim opeating conditions of beaing and conside beaing type. Function and constuction of components to house beaings Beaing mounting location Dimensional limitations Magnitude and diection of beaing load Magnitude of vibation and shock load Shaft speed Beaing aangement (fixed side, floating side) Noise and toque of the beaing Beaing opeating tempeatue ange Beaing igidity Installation / disassembly equiements Maintenance and inspection Cost-effectiveness Allowable misalignment of inne/oute ings Detemine beaing type and aangement. Select beaing dimensions. Design life of components to house beaings Dynamic/static equivalent load conditions Safety facto So Allowable speed Allowable axial load Detemine beaing dimensions. Select beaing toleances. Shaft unout toleances Toque fluctuation High-speed opeation Decide beaing gade. Select beaing intenal cleaance. Mateial and shape of shaft and housing Fit Tempeatue diffeence between inne and oute ings Allowable misalignment of inne/oute ings Magnitude and natue of load Amount of peload Decide beaing intenal cleaance. Select cage. Rotational speed Noise level Vibation and shock load Lubication Cage type Select lubication method. Opeating tempeatue Rotational speed Lubication method Sealing method Maintenance and inspection Decide lubication method, lubicant, and sealing method. Conside special specifications. Opeating conditions (special envionments: high o low tempeatue, chemical) Requiement fo high eliability Decide special beaing specifications. Select installation and disassembly pocedues. Mounting dimensions Installation and disassembly pocedues Decide installation and disassembly pocedues. 5

10 Technical Data Table 2.2 Beaing selection pocedue Use s equiements Max. speed Main spindle size Lubication system Beaing size. Consideation of allowable dmn value. Consideation of fit. Consideation of tightening foce fo inne ing space. Consideation of dive-up of font cove. Estimation of beaing intenal peload at maximum speed and consideation of beaing initial cleaance accoding to NTN s beaing selection guideline. Finalization of beaing specifications. NG Consideation of igidity of beaing and main spindle. Consideation of beaing life. OK Finalization of main spindle specifications The aticles necessay fo basic consideations in selecting an optimal main spindle beaing fo machine tool ae summaized in Table 2.3. Table 2.3 Selection pocedue fo beaings fo main spindles of machine tools (1) Type of Machine (2) Main spindle oientation (3) Diamete and size of main spindle NC Lathe, machining cente, ginding machine, etc. Vetical, hoizontal, vaiable-diection, inclined, etc. #3, #4, #5, etc. F d1 d2 d3 d4 Beaing type/beaing numbe Rota (Weight m) F 1 Pulley d7 (4) Shape and mounting-elated dimensions of main spindle Fa Fm Main spindle inne diamete d5-1 Main spindle oute diamete d5 Main spindle inne diamete d6-1 Main spindle oute diamete d6 Fig. 2.1 Main spindle shape and mounting-elated dimensions (example) (5) Intended beaing type, beaing size, and peloading method (6) Slide system fee side (7) Lubication method (8) Dive system Pesence/absence of jacket cooling (9) aangement on beaing aea (1) Jacket cooling conditions Font (angula contact type, cylindical olle type) o ea (angula contact type, cylindical olle type) peloading system (fixed-position peloading, fixed-pessue peloading) Cylindical olle beaing, ball bushing (availability of cooling) Gease, ai-oil, oil mist (MiconLub) Built-in moto, belt dive, coupling Yes/No Synchonization with oom tempeatue, machine-to-machine synchonization, oil feed ate (L/min) Max. speed (min -1 ) (11) Opeating speed ange Nomal speed ange (min -1 ) Opeating speed ange (min -1 ) Load cente Applied load Radial load F (N) Axial load Fa (N) (12) Load conditions (machining conditions) Speed Machining fequency Intended beaing life 6

11 Technical Data 2 Beaing accuacy Beaing accuacy Accuacies of olling beaings, that is, dimensional accuacy and unning accuacy of olling beaings ae defined by applicable ISO standads and JIS B 1514 standad (Rolling beaings - Toleances) (Tables 2.4 and 2.5). The dimensional accuacy govens the toleances that must be satisfied when mounting a beaing to a shaft o housing, while the unning accuacy defines a pemissible un-out occuing when otating a beaing by one evolution. Methods fo measuing the accuacy of olling beaings (optional methods) ae descibed in JIS B 1515 (Measuing methods fo olling beaings). Table 2.6 summaizes some typical methods fo measuing unning accuacy of olling beaings. Table 2.4 Beaing types and applicable toleance Beaing type Applicable standad Toleance class Angula contact ball beaings Cylindical olle beaigns Needle olle beaings JIS B 1514 ISO492 Class Class Class Class 6 class 6 class 6 Class 5 Class 4 Class 5 Class 4 Class 5 Class 4 Class 2 Class 2 Tapeed olle beaings Metic Inch J seies JIS B 1514 ANSI/ABMA Std.19 ANSI/ABMA Std.19.1 Class,6X Class 4 Class K class 6 Class 2 Class N Class 5 Class 3 Class C Class 4 Class Class B Class Class A Double ow angula contact thust ball beaings NTN standad Class 5 Class 4 Table 2.5. Compaison of toleance classifications of national standads Standad Japanese industial standad (JIS) Intenational Oganization fo Standadization (ISO) Deutsches Institut fu Nomung(DIN) Applicable standed JIS B 1514 ISO 492 ISO 199 ISO 578 ISO 1224 DIN 62 Ameican National Standads Institute (ANSI) ANSI/ABMA Std.2 Ameican Beaing Manufactue's Association ANSI/ABMA Std.19.1 (ABMA) ANSI/ABMA Std.19 Toleance Class Class,6X Class 6 Class 5 Class 4 Class 2 Nomal class Class 6X Class 6 Class 5 Class 4 Class 2 Nomal Class Class 6 Class 5 Class 4 Class 4 Class 3 Class Class Class 5A Class 4A P P6 P5 P4 P2 ABEC-1 RBEC-1 Class K Class 4 ABEC-3 RBEC-3 Class N Class 2 ABEC-5 RBEC-5 ABEC-7 ABEC-9 Class C Class B Class A Class 3 Class Class 1 "ABEC" is applied fo ball beaings and "RBEC" fo olle beaings. Notes 1: JIS B 1514, ISO 492 and 199, and DIN 62 have the same specification level. 2: The toleance and allowance of JIS B 1514 ae slightly diffeent fom those of ABMA standads. 1 All type Radial beaings Thust ball beaings Beaing Types Tapeed olle beaings (Inch seies) Pecision instument beaings All type Radial beaings (Except tapeed olle beaings) Tapeed olle beaings (Metic seies) Tapeed olle beaings (Inch seies) 7

12 Technical Data To attain a highe level of unning accuacy equied of a main spindle of machine tool, a high-pecision beaing that satisfies the use's main spindle specifications must be chosen. Usually, a highpecision beaing pe JIS accuacy class 5, 4 o 2 is selected accoding to an intended application. In paticula, the adial un-out, axial un-out and nonepetitive un-out of a main spindle beaing geatly affect the unning accuacy of the main spindle and theefoe have to be stictly contolled. With the ecent supe high-pecision machine tools, the contol of N.R.R.O. (Non-Repetitive Run-Out) has inceasing impotance, and the main spindle on a tuning machine o machining cente incopoates an N.R.R.O. accuacy contolled beaing. Fo futhe infomation about N.R.R.O., efe to the following section. Note that to attain a highe accuacy with a main spindle, caeful consideations need to be execised fo the accuacies (ciculaity, cylindicity, coaxiality) of machine components othe than a beaing (shaft, housing) as well as machining method and finish accuacy of the shaft and housing. Fo the infomation about the accuacies of shaft and housing, efe to a section given late. Table 2.6 Measuing methods fo unning accuacies Chaacteistic toleance Measuement method Inne ing adial unout (Kia) Measuing load Measuing load Radial unout of the inne ing is the diffeence between the maximum and minimum eading of the measuing device when the inne ing is tuned one evolution. Oute ing adial unout (Kea) Measuing load Measuing load Radial unout of the oute ing is the diffeence between the maximum and minimum eading of the measuing device when the oute ing is tuned one evolution. Inne ing axial unout (Sia) Measuing load Measuing load Axial unout of the inne ing is the diffeence between the maximum and minimum eading of the measuing device when the inne ing is tuned one evolution. Oute ing axial unout (Sea) Measuing load Measuing load Axial unout of the oute ing is the diffeence between the maximum and minimum eading of the measuing device when the oute ing is tuned one evolution. Inne ing side unout with boe (Sd) Inne ing side unout with boe is the diffeence between the maximum and minimum eading of the measuing device when the inne ing is tuned one evolution togethe with the tapeed mandel. Oute ing outside suface inclination (SD) 1.2s max 1.2s max Reinfocing plate Oute ing outside suface inclination is the diffeence between the maximum and minimum eading of the measuing device when the outside ing is tuned one evolution along the einfocing plate. 8

13 Technical Data N.R.R.O. (Non-Repetitive Run-Out) of beaing Accuacies of olling beaings ae defined by applicable ISO standads and a JIS (Japanese Industial Standad) standad, wheein the accuacies ae discussed unde the desciptions of adial un-out (Kia), axial un-out (Sia), etc. Accoding to the methods fo measuing unning accuacies in Table 2.6, un-out is ead by tuning a beaing by only one evolution (each eading is synchonized with the evolution of the beaing being analyzed). In fact, howeve, a olling beaing fo machine tool is used in a continuous evolving motion that involves moe than one evolution. As a esult, the actual un-out accuacy with a olling beaing includes elements that ae not synchonous with the evolution of the beaing (fo example, a diffeence in diamete among olling elements involved, as well as oundness on the aceway sufaces of inne ing and oute ing), causing the tajectoy of plotting with unning accuacies to vay with each evolution. The un-out of an element not in synchonization with the evolutions of beaing is known as N.R.R.O. (Non- Repetitive Run-Out) and is equivalent to the amplitude in the Lissajous figue illustated in Fig The effect of N.R.R.O. on a olling beaing onto the accuacies is illustated in Fig. 2.4 by taking a main spindle of tuning machine as an example. This diagam illustates a machining pocess whee the outside suface of a wok piece mounted to the main spindle is shaved by a tuning opeation. If the outside suface is cut with a new tajectoy with evey evolution, the outside shape of wok piece will be distoted. Futhemoe, if the accuacies of shaft and housing ae not high enough o beaings ae assembled onto the shaft and/o housing impopely, the beaing ing can be defomed, possibly leading to a un-out that is not in synchonization with the evolutions of beaing. 1st evolution 2nd evolution 3d evolution Revolution-synchonized vibation only Fig. 2.2 Non-evolution-synchonized vibation only Cutting tool Distotion of wok piece shape Fig. 2.4 Model of cutting opeation Non-epetitive un-out Fig. 2.3 Lissajous figue 9

14 Technical Data Accuacies of shaft and housing Depending on the fit of a beaing to a shaft and a housing, the beaing intenal cleaance can vay. Fo this eason, an adequate beaing fit has to be attained so that the beaing can pefom as designed. (Refe to the ecommended fit section.) Also, the axial tightening toque on a beaing needs to be consideed. To avoid defomation of beaing aceway suface owing to axial tightening of the beaing, it is necessay to caefully detemine the dimensions of components associated with a tightening foce the magnitude of tightening foce and the numbe of tightening bolts. The cleaance on a tapeed boe cylindical olle beaing is adjusted by changing the dive-up to the tape. Because of this, the citical factos associated with an appopiate fit of a beaing to a shaft and/o a housing ae the dimensional accuacies of the tape, contact suface on the tape, and the squaeness of the end face of the inne ing elative to the shaft centeline duing the dive-up pocess. Typical accuacy values fo a spindle and housing ae summaized in Tables 2.7 and 2.8. Typical accuacy fo spindle Typical accuacy fo housing Table 2.8 Fom accuacy of housing 1 t3 t t1 AB AB A Da AB 2 A Fundamental pemissible toleance IT Accuacy Symbol Toleance3 P5 P4 P2 Deviation fom cicula fom Angulaity Run out t t1 t3 IT3 2 IT3 2 IT3 B Db IT2 2 IT2 2 IT3 t3 t t1 t4 AB IT1 2 IT1 2 IT2 Table 2.7 Fom accuacy of spindle 1 A da t3 t t1 AB B AB t2 AB t db t4 2 A Eccent icity t4 1 The fom toleance, symbol and efeence face of the housing ae in accodance with ISO R The length of the beaing fit suface is often too small to measue concenticity. Theefoe, this citeion applies only when the fit suface has a width sufficient as a efeence face. 3 Housing boe diametes Da and Db ae the efeence dimensions used when the toleance fo pemissible fom accuacy ae detemined. Fo example, when a JIS class 5 beaing is used fo a housing with a 5 mm inside boe, the toleance of oundness is t = IT3/2 = 5/2 = 2.5m. IT5 IT4 IT3 Accuacy Deviation fom cicula fom Angulaity Run out Eccent icity Symbol Toleance 3 Fundamental pemissible toleance IT P5 P4 P2 t t1 t2 t3 t4 1 The fom toleance, symbol, and efeence face of spindle ae in accodance with ISO R The length of the beaing fit suface is often too small to measue concenticity. Theefoe, this citeion applies only when the fit suface has a width sufficient as a efeence face. 3 When detemining a toleance fo pemissible fom accuacy, the efeence dimensions used ae shaft diametes da and db. Fo example, when using a JIS class 5 beaing fo a dia. 5 mm shaft, the toleance of oundness is t = IT3/2 = 4/2=2 m. 4 IT is pefeed if the diamete toleance of the beaing fit suface is IT3. IT3 2 IT3 2 IT3 IT5 IT2 2 IT2 2 IT3 2 IT3 IT4 IT 2 IT 2 IT2 2 IT2 IT3 4 4 Fundamental toleance IT Table 2.9 Fundamental toleance IT Classification of nominal dimension mm ove incl Fundamental toleance IT value m IT IT1 IT2 IT3 IT

15 Technical Data 3 Beaings and igidity The igidity of the main spindle of a machine tool is associated with both beaing igidity and shaft igidity. Beaing igidity is typically govened by the elastic defomation between the olling elements and aceway suface unde load. Usually, beaings ae peloaded in ode to incease the igidity. Unde same loading conditions, a olle beaing has a highe igidity than a ball beaing of the same size. Howeve, having sliding potions, a olle beaing is disadvantageous in suppoting a high-speed shaft. Shaft igidity is geate with a lage shaft diamete. Howeve, the suppoting beaing must have a sufficient size and its dmn value (pitch cente diamete acoss olling elements dm [mm] multiplied by speed [min -1 ]) must be accodingly geate. Of couse, a lage beaing is disadvantageous fo high-speed applications. To sum up, the igidity equied of the shaft aangement must be consideed befoe the beaing igidity (beaing type and peload) and shaft igidity ae detemined. Beaings igidity The igidity of a beaing built into a spindle diectly affects the igidity of the spindle. In paticula, a high degee of igidity is equied of the main spindle of a machine tool to ensue adequate poductivity and accuate finish of wokpieces. Beaing igidity is govened by factos such as the following: (1) Types of olling elements (2) Size and quantity of olling elements (3) Mateial of olling elements (4) Beaing contact angle (5) Peload on beaing Type of olling elements (olle o ball) The suface contact patten of the olling element and aceway is line contact with a olle beaing, while a ball beaing is point contact. As a esult, the dynamic defomation of a beaing elative to a given load is smalle with a olle beaing. Size and numbe of olling elements The size and numbe of olling elements of a beaing ae detemined based on the tageted pefomance of the beaing. Lage olling elements lead to a geate beaing igidity. Howeve, a beaing having lage olling elements tends to be affected by gyatoy sliding centifugal foce, and, as a esult, its high-speed pefomance will be degaded. Incidentally, a geate numbe of olling elements helps incease beaing igidity, but at the same time ceates an inceased numbe of heat geneation souces, possibly leading to geate tempeatue ise. Fo this eason, smalle size of olling elements ae used fo high-speed applications. To achieve both "high speed" and "high igidity", each type of the NTN angula contact ball beaing fo a machine tool is manufactued accoding to optimized specifications fo inteio stuctue. Axial displacement (m) Axial displacement (m) 2LA-HSE2C 72UC Axial load (N) Fig. 2.5 Mateial of olling element (ceamic and steel) Cetain NTN beaings incopoate ceamic olling elements. As Young's modulus of silicon nitide (315 GPa) is geate than that of beaing steel (21 GPa), the igidity with this type of beaing is accodingly geate. Axial displacement (m) Beaing steel ball Ceamic ball Axial load (N) Fig. 2.6 Beaing contact angle A smalle contact angle on an angula contact ball beaing esults in geate adial igidity. When used as a thust beaing, this type of beaing should have a geate contact angle to enable geate axial igidity. 2LA-HSE2CDB/GL=15 2LA-HSE2DB/GL=2 2LA-HSE2ADDB/GL=25 Axial load (N) Fig

16 Technical Data Peload on beaing A geate peload on a given beaing esults in geate igidity (Fig. 2.8). Howeve, too geat of a peload on a beaing can lead to oveheating, seizue, and/o pematue wea of the beaing. It is possible to use beaings in thee- o fou-ow configuations in ode to achieve inceased axial igidity (Fig. 2.9). Axial displacement (µm) 2LA-HSE2DB/GL 2LA-HSE2DB/GN 2LA-HSE2DB/GM Axial load (kn) Fig. 2.8 Peloading technique and peload Beaing peloading techniques can be categoized as definite position peloading and constant pessue peloading (Fig. 2.1). Definite position peloading is useful in enhancing the igidity of a beaing unit, as the positional elationship acoss individual beaings can be maintained. On the othe hand, as peloading is achieved with sping foce, the constant pessue peloading technique can maintain a peload constant even when the beaing-to-beaing distance vaies due to heat geneation on the spindle o a change in load. The basic peload fo a duplex beaing is given in the elevant section fo each beaing. If an angula contact ball beaing is to be used fo a high-speed application, such as fo the main spindle of a machine tool, detemine the optimal peload by consideing the incease in contact suface pessue between olling elements and the aceway suface that esults fom gyatoy sliding and centifugal foce. When consideing such an application, consult NTN Engineeing. Definite position peloading Axial displacement (µm) 2LA-HSE2DB/GL 2LA-HSE2DBT/GL 2LA-HSE2DTBT/GL Axial load (kn) Fig. 2.9 Constant pessue peloading Fig. 2.1 Peload and igidity The effect of peloading fo an incease in beaing igidity is summaized in Fig When the inne ings in the diagam ae tightened to bing them togethe, beaings!and!ae each axially displaced by dimensionδo, theeby attaining a peload Fo. In this situation, if an axial load Fa is futhe exeted fom outside, the displacement on beaing!inceases byδa, while the displacement on beaing!deceases. At this point, the loads on beaings!and!ae F!and F!, espectively. When compaed with δb (the displacement occuing when an axial load Fa is exeted onto a non-peloaded beaing!), displacementδa is small. Thus, a peloaded beaing has highe igidity. Fo Beaing@ Beaing! δo δo Fa Fo (1) Fee fom peloading (2) Unde peloading Fo (3) Unde peloading with axial load applied δo δa F2 δo Oute ing Ball Inne ing δo δa Inne ing axial δo displacement Fo : peload Inne ing axial δa displacement F1=F2Fa Beaing@ Axial load δb Fo δ1 δo δa δo Fa δ2 Beaing! Fa F2 F1 Axial displacement Fig Peload gaph 12

17 Technical Data Gyatoy sliding Evey olling element M (ball) in an angula contact A ball beaing evolves on the axis of otation A-A' as illustated in Fig A evolving object tends to A' M foce the axis of otation to a vetical o hoizontal attitude. As a esult, the Fig Gyatoy sliding olling element develops a foce to alte the oientation of the axis of otation. This foce is known as a gyatoy moment (M). When the foce due to the gyatoy moment is geate than the esistance foce (olling element load multiplied by the coefficient of fiction between the aceway and olling element), gyatoy sliding occus on the aceway suface. This leads to heat geneation, wea and seizue. Theefoe, it is necessay to povide a sufficient esistance foce to inhibit gyatoy sliding. NTN's ecommended peload is based on this theoy. The gyatoy moment that will occu can be calculated by the fomula below. Mkbcsin 1 2 k mdw 1.45dw 5 M dw 5 n 2 sin M Gyatoy moment bautootation angula velocity of olling element cangula velocity of evolution m Mass of olling element Density of olling element dw Diamete of olling element Angle of axis of otation of olling element n Speed of inne ing Spin sliding Evey olling element (ball) in an angula contact ball beaing develops spin sliding that is unavoidable owing to the stuctue of the beaing, elative to the aceway suface of eithe the inne ing o oute ing (Fig. 2.13). Usually, at a lowe speed Fig Spin sliding ange, pue olling motion occus between an inne ing aceway and olling elements and spin sliding develops between an oute ing aceway and olling elements (this state is known as inne ing contol). At a highe speed ange, pue olling motion occus between an oute ing aceway and olling elements and spin sliding develops between an inne ing aceway and olling elements (this state is known as oute ing contol). A point whee tansfe fom inne ing contol to oute ing contol occus is known as contol tansfe point. An amount of spin sliding and contol tansfe point can vay depending on the beaing type and beaing data. Geneally, the amount of spin sliding will be geate with an oute ing contol state. Accoding to J. H. Rumbage and J. D. Dunfee, when the amount of spin sliding exceeds (N/m m 2 -mm/s), incease of heat geneation and wea stat. Geneally, it is necessay fo a beaing of a highspeed main spindle to have a peload that can pevent spin sliding. The example of wea on a beaing owing to spin sliding is given in Fig The magnitude of spin-deived wea is govened by a PV value (amount of spin sliding) duing opeation of the main spindle. Theefoe, the optimum beaing fo main spindle must be selected. Though the possibility of spin-deived wea occuence vaies depending on the beaing type, model numbe and specifications, we caefully detemined a contol tansfe point in an opeating aangement fo NTN angula contact ball beaings fo main spindles of machine tools. Thus, we believe that the amount of spin sliding with this beaing categoy is not vey lage. Additionally, the magnitude of spin-deived wea is significantly affected by how well the aceway suface is lubicated. Regadless of the type of sliding, even mino sliding can lead to wea if oil film is not fomed well. Fo this eason, a eliable lubication aangement needs to be incopoated. The fom of wea on the beaing aceway deived fom spin sliding appeas as. The wea on the aceway suface on inne ing that esulted fom spin sliding is given below. 2.5m Possible causes fo Rolling contact aea (1) Contact ellipse and diection of spin sliding (3) Beaing pessue within ellipse (P) (5) Wea on aceway suface Beaing: 726T1 Thust load: 2 kn Speed: 5 min -1 Lubication: Gease Run time: 5 h type wea (2) Sliding velocity (V) (4) PV value owing to spin PVmax 2.14 Mechanism of wea on beaing owing to spin sliding 13

18 Technical Data 14 4 Designing shaft and housing In designing a beaing and housing, it is vey impotant to povide a sufficient shoulde height fo the beaing and housing so as to maintain beaing and housing accuacies and to avoid intefeence with the beaing elated cone adius. The chamfe dimensions ae shown in Table 2.1 and the ecommended shoulde height and cone adii on the shaft and housing ae listed in Table Table 2.1 Allowable citical-value of beaing chamfe (1) Radial beaings (Except tapeed olle beaings) (2) Metic tapeed olle beaings Unit mm s min 1 Nominal s maxo1s max s min 2 Nominal boe 3 boe diamete diamete of beaing o d o "d" o nominal Radial Axial outside diamete "D" Radial 1s min ove incl. diection diection 1s min ove incl. diection These ae the allowable minimum dimensions of the chamfe dimension "" o "1" and ae descibed in the dimensional table. Beaing cone adius dimensions s max o1s max s min o 1s min Boe diamete face s min o 1s min of beaing o oute diamete face of s max o 1s max beaing (Axial diection) Fig Unit mm Axial diection These ae the allowable minimum dimensions of the chamfe dimension "" o "1" and ae descibed in the dimensional table. 3 Inne ings shall be in accodance with the division of "d" and oute ings with that of "D". Note: This standad will be applied to beaings whose dimensional seies (efe to the dimensional table) ae specified in the standad of ISO 355 o JIS B Fo futhe infomation concening beaings outside of these standads o tapeed olle beaings using US customay units, please contact NTN Engineeing. Side face of inne ing o cente washe, o side face of oute ing s min o 1s min (3) Thust beaings Unit mm s max o 1s max s min o 1 min 4 (Radial diection) s max o1s max Radial and axial diecition These ae the allowable minimum dimensions of the chamfe dimension "" o "1" and ae descibed in the dimensional table.

19 Technical Data Abutment height and fillet adius The shaft and housing abutment height (h) should be lage than the beaing's maximum allowable chamfe dimensions (s max), and the abutment should be designed so that it diectly contacts the flat pat of the beaing end face. The fillet adius (a) must be smalle than the beaing's minimum allowable chamfe dimension (s min) so that it does not intefee with beaing seating. Table 2.11 lists abutment height (h) and fillet adius (a). Fo beaings that suppot vey lage axial loads, shaft abutments (h) should be highe than the values in the table. Whee a fillet adius (a max) lage than the beaing chamfe dimension is equied to stengthen the shaft o to elieve stess concentation (Fig. 2.16a), o whee the shaft abutment height is too low to affod adequate contact suface with the beaing (Fig. 2.16b), spaces may be used effectively. Relief dimensions fo gound shaft and housing fitting sufaces ae given in Table h h Fig Beaing mounting with space Table 2.11 Fillet adius and abutment height Unit mm h (min) Nomal use If beaing suppots lage axial load, the height of the shoulde must exceed the value given hee. Note: as max maximum allowable fillet adius Relief dimensions fo gounding t t Relief dimensions b t b b

20 Technical Data 3. Load Rating and Life 1 Beaing life Even in beaings opeating unde nomal conditions, the sufaces of the aceway and olling elements ae constantly being subjected to epeated compessive stesses which causes flaking of these sufaces to occu. This flaking is due to mateial fatigue and will eventually cause the beaings to fail. The effective life of a beaing is usually defined in tems of the total numbe of evolutions a beaing can undego befoe flaking of eithe the aceway suface o the olling element sufaces occus. Othe causes of beaing failue ae often attibuted to poblems such as seizue, abasions, cacking, chipping, scuffing, ust, etc. Howeve, these so called "causes" of beaing failue ae usually caused by impope installation, insufficient o impope lubication, faulty sealing o impope beaing selection. Since the above mentioned "causes" of beaing failue can be avoided by taking the pope pecautions, and ae not simply caused by mateial fatigue, they ae consideed sepaately fom the flaking aspect. Usually, the load exeted on the main spindle of a machine tool is elatively small compaed to the dynamic ated load on the beaing. Theefoe, the fatigue life of a beaing seldom poses a poblem. The following opeating conditions, athe than a beaing's ating life, can significantly affect the beaing functions (unning accuacy, igidity, heat geneation, etc.) and equie special consideation. (1) High speed opeation. (2) Heavy peload. (3) Lage bending of the shaft. (4) Lage tempeatue diffeence between the inne and oute ings. Fo futhe infomation, please consult NTN Engineeing. Basic ating life and basic dynamic load ating A goup of seemingly identical beaings when subjected to identical load and opeating conditions will exhibit a wide divesity in thei duability. This "life" dispaity can be accounted fo by the diffeence in the fatigue of the beaing mateial itself. This dispaity is consideed statistically when calculating beaing life, and the basic ating life is defined as follows. The basic ating life is based on a 9% statistical model which is expessed as the total numbe of evolutions 9% of the beaings in an identical goup of beaings subjected to identical opeating conditions will attain o supass befoe flaking due to mateial fatigue occus. Fo beaings opeating at fixed constant speeds, the basic ating life (9% eliability) is expessed in the total numbe of hous of opeation. Basic dynamic load ating expesses a olling beaing's capacity to suppot a dynamic load. The basic dynamic load ating is the load unde which the basic ating life of the beaing is 1 million evolutions. This is expessed as pue adial load fo adial beaings and pue axial load fo thust beaings. These ae efeed to as "basic dynamic load ating (C)" and "basic dynamic axial load ating (Ca)." The basic dynamic load atings given in the beaing tables of this catalog ae fo beaings constucted of NTN standad beaing mateials, using standad manufactuing techniques. The elationship between the basic ating life, the basic dynamic load ating and the beaing load is given in the fomula below. Fo ball beaings: L1 =( C ) 3 (3.1) P L1h = 16 ( C ) 3 (3.2) 6n P Fo olle beaings: L1 =( C ) 1/3 (3.3) P L1h = 16 ( C ) 1/3 (3.4) 6n P whee, L1 : Basic ating life, 1 6 evolutions L1h : Basic ating life, h C : Basic dynamic load ating, N {kgf} (C: adial beaings, Ca: thust beaings) P : Equivalent dynamic load, N {kgf} (P: adial beaings, Pa: thust beaings) n : Rotational speed, min -1 When seveal beaings ae incopoated in machines o equipment as complete units, all the beaings in the unit ae consideed as a whole when computing beaing life (see fomula 3.5). 1 L=( (3.5) ) 1/e L 1 e L 2 e whee, L : Total basic ating life of entie unit, h L1, L2 Ln: Basic ating life of individual beaings, 1, 2, n, h e = 1/9...Fo ball beaings e = 9/8...Fo olle beaings When the load conditions vay at egula intevals, the life can be given by fomula (3.6). L n e Lm =( Φ1 + Φ2 + Φ j ) -1 (3.6) L1 L2 L j 16

21 Technical Data whee, L m : Total life of beaing Φ j : Fequency of individual load conditions (ΣΦ j = 1) L j : Life unde individual conditions Adjusted ating life The basic beaing ating life (9% eliability facto) can be calculated by the fomula (3.2) mentioned. Howeve, in some applications a beaing life facto of ove 9% eliability may be equied. To meet these equiements, beaing life can be lengthened by the use of specially impoved beaing mateials o manufactuing pocess. Beaing life is also sometimes affected by opeating conditions such as lubication, tempeatue and otational speed. Basic ating life adjusted to compensate fo this is called "adjusted ating life," and is detemined by using the fomula (3.7). Lna = a1 a2 a3 L1 (3.7) whee, Lna : Adjusted ating life in millions of evolutions (1 6 ) a1 : Reliability facto a2 : Beaing chaacteistics facto a3 : Opeating conditions facto Life adjustment facto fo eliability a1 The value of eliability facto a1 is povided in Table 3.1 fo eliability of 9% o geate. Table 3.1 Reliability facto a1 Reliability % L L L L L L L Reliability facto a Life adjustment facto fo mateial a2 Beaing chaacteistics concening life vay accoding to beaing mateial, quality of mateial and use of special manufactuing pocesses. In this case, life is adjusted by the beaing chaacteistics facto a2. The basic dynamic load atings listed in the catalog ae based on NTN's standad mateial and pocess, theefoe, the adjustment facto a2 =1. a2>1 may be used fo specially enhanced mateials and manufactuing methods. If this applies, consult NTN Engineeing. Life adjustment facto fo opeating conditions a3 Opeating conditions facto a3 is used to compensate fo when the lubication condition wosens due to ise in tempeatue o otational speed, lubicant deteioates, o becomes contaminated with foeign mattes. Geneally speaking, when lubicating conditions ae satisfactoy, the a3 facto has a value of one. And when lubicating conditions ae exceptionally favoable and all othe opeating conditions ae nomal, a3 can have a value geate than one. a3 is howeve less than 1 in the following cases: Dynamic viscosity of lubicating oil is too low fo beaing opeating tempeatue (13 mm 2 /s o less fo ball beaings, 2 mm 2 /s fo olle beaings) Rotational speed is paticulaly low (If multiplication of otational speed n min -1 and olling element pitch diamete Dpw mm is Dpw n< 1,) Beaing opeating tempeatue is too high Lubicant is contaminated with foeign matte o moistue 17

22 Technical Data New beaing life fomula By damatic impovement in beaing mateials and beaing manufactuing techniques, beaings can offe a life seveal times as long as that calculated fom the fomula (3.7) as long as they ae mounted with minimal mounting eos ae fully fee fom foeign matte and adequately lubicated. This finding was obtained by a seies of expeiments pefomed by NTN. NTN's new beaing life calculation theoy is based on a fatigue limit theoy accoding to which unde clean and efficient lubication conditions, beaing life can be indefinite at a paticula contact suface pessue. Fo this pupose, NTN pefoms calculations based on the contact suface pessue at a fatigue limit of 1.5 GPa that is defined in ISO281: 199/Amd2: 2. Incidentally, if foeign matte entes into a beaing, depending on the size and amount of foeign matte, the actual life of that beaing can be much shote than the ating life that is calculated by fomula (3.7). Also, poo lubicating conditions can cause the actual beaing life to be shote than the ating life. NTN's new beaing life calculation is designed to detemine a new life coection facto a NTN by the following fomula. C p Lnm=a1 a NTN ( ) (3.8) P Beaing life theoy (1) Conventional Lundbeg-Palmgen (L-P) theoy Accoding to this theoy, a stess that govens olling fatigue is consideed, that is, a maximum dynamic shea stess τo that is exeted, at a depth of Zo fom the olling contact suface, in a plane paallel with the olling contact suface. Refeing to a theoy of Neube, et. al. which claims that the duability of a mateial deteioates as the volume being subjected to a stess application deceases, the L-P theoy assumes that a fissue occuing at a weak point of mateial at aound the depth Zo eaches the suface and leads to develop flaking. The pobability of suvival S of a volume V that is subjected to N times of stess application is detemined by the fomula below accoding to the Weibull theoy. 1 N e τ c V Rn (3.9) S z h whee, S :Pobability of suvival of stess volume V N :Numbe of epeated stess applications e :Weibull slope (index to epesent vaiation in life) τo :Maximum shea stess Zo :Depth fom suface at which maximum shea stess occus c,h:indexes Fom the basic fomula fo the beaing life elative to olling fatigue (3.9), a geneic life fomula below is obtained: C P p L1= ( ) (3.1) whee, L1:Basic ating life C :Basic dynamic load ating P :Dynamic equivalent load p :(c h+2)/3e (point contact) (c h+1)/2e (line contact) Z 2a Fig. 3.1 Stess volume esulting fom olling contact accoding to L-P theoy (2) NTN's new beaing life theoy While the L-P theoy intends to define intenally occuing flaking owing to the shea stess within a mateial that esults fom hetzian contact, NTN's new beaing life theoy is designed not only to evaluate suface-initiated flaking but also to detemine life of each small segment (ΔL1) based on a local stess (σ1). This is done by dividing an aea fom the inteio to the contact suface of the mateial into small segments as illustated in Fig. 3.2, and finally obtaining the oveall beaing life L by the fomula (3.13). 1 ΔN e i σc iδvi Rn (3.11) ΔS i z h i ΔLi=ΔNi (σ -c i ΔV -1 i z h i ) 1/e (3.12) n -1/e L= { Σ ΔLi -e } (3.13) i=1 whee, ΔSi:pobability of suvival of stess volumeδvi of divided segment L :Oveall beaing life Zi :Depth of divided small stess volumeδvi fom the suface n :Numbe of segments σ u :Fatigue limit stess A stess below which a beaing does not develop failue (flaking) unde ideal lubication conditions. ISO 281: 199/Amd2: 2 specifies 1.5 GPa as a the maximum contact suface pessue at a fatigue limit. NTN uses it as a Von Misses stess equivalent to the maximum contact suface pessue 1.5 GPa. When σi is smalle than σ u (fatigue limit), the life of a egion in question (ΔL1) will be infinitely long. 18

23 Technical Data NTN's new beaing life fomula The coelation between the NTN's life coection facto a NTN and coected ating life Lnm is defined by the fomula (3.14) below. C p Lnm=a1 a NTN ( ) (3.14) P whee, Pmax Z Fig. 3.2 Calculation model Lnm :Coected ating life a1 :Reliability coefficient a NTN :Life coection facto that eflects mateial popeties, fatigue limit stess, contamination with foeign matte and oil film paamete (Λ) (.1 a NTN 5) C :Basic dynamic load ating P :Dynamic equivalent load p :Index 3 (ball beaing) 1/3 (olle beaing) (1) Effect of fatigue limit NTN's new beaing life fomula intoduces a concept of fatigue life accoding to which the beaing life is infinitely long at a paticula contact suface pessue as illustated in Fig. 3.3 assuming no foeign matte is tapped in the beaing and the beaing is eliably lubicated. y (2) Effect of foeign matte The effect of foeign matte is teated as sufaceinitiated flaking that stats fom a dent esulting fom tapped foeign matte. NTN pefoms a beaing life calculation, assuming that the size of foeign matte and the stess concentation aea in the middle potion (the size of this aea coesponds with that of the foeign matte) in the suface laye as well as the amount of foeign matte significantly affect the beaing life. Dented aceway Nomal aceway Fig. 3.4 Contact suface pessue distibution esulting fom dent (3) Effect of oil film paamete (Λ) The oil film paamete can be used to calculate beaing life. The oil film paamete, designated byλ, is the atio of the oil film thickness to the oughness of the suface. It can be used to calculate the aveage stess acoss the suface laye of two contacting sufaces, such as a olling element and aceway. Fom this suface laye stess, the contact suface pessue can be detemined. Beaing life is then calculated fom the contact suface pessue. Conditions of two objects on suface laye Calculation model Object having composite oughness of two objects Smooth suface Contact suface pessue equivalent to fatigue limit Contact stess Rating life Life eflecting fatigue limit Life Fig. 3.3 Basic concept of fatigue limit Oil film Fig. 3.5 Model of stess load onto the suface laye New life calculation fomula chat Vaious statuses of contamination with foeign matte ae defined in Table 3.2. The values of ISO codes and NAS classes ae those fo ball beaings that ae subjected to moe sevee opeating conditions. Table 3.2 Status of contamination Condition of contamination Extemely clean Clean Nomal Lightly contaminated Modeately contaminated Highly contaminated Seveely contaminated Contamination coefficient Guideline fo application ISO cleanliness code (ISO 446) NAS class Filteed Less than 1 µm 13m 35m 57m 71m 1 µm o moe No filte Ingess of much dust 13/1 15/12 17/14 19/16 21/18 23/2 25/

24 Technical Data (1) Effect of foeign matte on coelation between load (P/C) and life coection facto a NTN antn antn antn 1 5 Nomal 15 1 Lightly contaminated Modeately contaminated Highly contaminated.5 Seveely contaminated Extemely clean Clean Nomal Highly contaminated 1.1 Seveely contaminated Extemely clean Clean.1 1 P/C Fig. 3.6 Coelation between P/C and antn (effect of foeign matte in ball beaing) P/C Fig. 3.7 Coelation between P/C and antn (effect of foeign matte in olle beaing) =1 =.5 =.1 =1.5 =2 = P/C antn Lightly contaminated Modeately contaminated (2) Effect of oil film paamete (Λ) on coelation between load (P/C) and life coection facto a NTN Fig. 3.8 Coelation between P/C and antn (effect ofwith ball beaing) 1 =3 5 =2 =1.5 1 =1 5.4 = = Static load ating and allowable axial load Basic static load ating When stationay olling beaings ae subjected to static loads, they suffe fom patial pemanent defomation of the contact sufaces at the contact point between the olling elements and the aceway. The amount of defomity inceases as the load inceases, and if this incease in load exceeds cetain limits, the subsequent smooth opeation of the beaings is impaied. It has been found though expeience that a pemanent defomity of.1 times the diamete of the olling element, occuing at the most heavily stessed contact point between the aceway and the olling elements, can be toleated without any impaiment in unning efficiency. The basic static load ating efes to a fixed static load limit at which a specified amount of pemanent defomation occus. It applies to pue adial loads fo adial beaings and to pue axial loads fo thust beaings. The maximum applied load values fo contact stess occuing at the olling element and aceway contact points ae given below. Fo ball beaings 4 2MPa{428kgf/mm 2 } Fo self-aligning ball beaings 4 6MPa{469kgf/mm 2 } Fo olle beaings 4 MPa{48kgf/mm 2 } Refeed to as "basic static adial load ating" fo adial beaings and "basic static axial load ating" fo thust beaings, basic static load ating is expessed as Co o Coa espectively and is povided in the beaing dimensions table. Allowable static equivalent load Geneally the static equivalent load which can be pemitted is limited by the basic static ating load as stated above. Howeve, depending on equiements egading fiction and smooth opeation, these limits may be geate o lesse than the basic static ating load. This is geneally detemined by taking the safety facto So given in Table 3.3 and fomula (3.13) into account. So =Co/Po (3.13) whee, So:Safety facto Co:Basic static load ating, N {kgf} adial beaings: Co, thust beaings: Coa Po:Static equivalent load, N {kgf} adial beaings: Po, thust beaings: Poa.1.1 P/C 1 Fig. 3.9 Coelation between P/C and antn (effect ofwith olle beaing) 2

25 Technical Data Table 3.3 Minimum safety facto values So Opeating conditions Ball beaings Rolle beaings High otational accuacy necessay 2 3 Nomal otating accuacy necessay (Univesal application) Slight otational accuacy deteioation pemitted (Low speed, heavy loading, etc.) Note: When vibation and/o shock loads ae pesent, a load facto based on the shock load needs to be included in the P max value. Allowable axial load A geate axial load can be exeted on a main spindle beaing on a machine tool allowing fo tool changes while the machine is stationay. When an angula contact ball beaing is subjected to a lage axial load, the contact ellipse between its olling elements and aceway suface can oveflow the aceway suface (Fig. 3.1). Futhemoe, even if the contact ellipse emains within the aceway suface, ovestessing can cause poblems such as denting. The maximum allowable load that does not cause such poblems is defined as the "allowable axial load." The allowable axial load is eached when eithe of the following conditions occus. The end of contact ellipse on the aceway suface eaches the shoulde of eithe an inne o oute ing. The contact suface pessue on the aceway suface eaches 365 MPa in eithe the inne o oute ing aceway. Note that the contact suface pessue of 365 MPa on the aceway suface is a value that leads to a pemanent defomation of.2 to.5 times as much as the olling element diamete and has been detemined though many yeas of expeience. The allowable axial load fo each beaing is found in the associated dimensions table. 4. Allowable Speed High beaing speed leads to high tempeatue ise on the beaing owing to fictional heating within the beaing. When the tempeatue of the beaing exceeds a paticula limit, the lubicant pefomance deteioates significantly, possibly leading to beaing oveheating o seizue. The factos that can affect the maximum allowable beaing speed include: (1) Beaing type (2) Beaing size (3) Lubication system (gease lubication, ai-oil lubication, jet lubication, etc.) (4) Intenal cleaance o peload on the beaing (5) Beaing aangement (2-ow, 3-ow, 4-ow) (6) Beaing load (7) Accuacies of shaft, housing, etc. The maximum allowable speeds listed in the beaing dimensions tables ae efeence values and ae applicable only to individual beaings that ae adequately lubicated and coectly peloaded unde a condition whee the heat is eliably emoved fom the beaing aangement. In the case of gease lubication, these speeds ae attainable only when the beaing is filled with an adequate amount of high-quality gease as given in Table 7.3, the beaing is sufficiently un in, and heat is emoved by an aangement such as a cooling jacket. In the case of oil lubication, these speeds ae attained only by an ai-oil lubication system if an adequate amount of VG1 o 32 spindle oil is supplied and the heat is emoved by an aangement such as a cooling jacket. When using a lage amount of lubicant, a jet lubication system excels in lubication and cooling pefomance, and can pemit opeation at the maximum allowable speed. Howeve, this lubication system involves a high powe loss and should be employed caefully. Fa a H Speed facto The maximum allowable speed of a paticula beaing can vay depending on the elation between heat geneation and heat dissipation in the beaing as well as how well the beaing is lubicated. The beaing aangements (2-ow to 4-ow) and speed eduction atios (speed factos) fo maximum allowable speed due to post-assembly peloads ae summaized in Table 4.1. H Shoulde height of beaing a Semimajo of contact ellipse Fa Axial load Fig. 3.1 Table 4.1 Speed facto by beaing aangement and peload Beaing aangement Matching DB DBT GL.85.7 GN.8.6 GM.65.5 DTBT

26 Technical Data 5. Beaing Aangements and Stuctues of Beaings fo Main Spindles 1 Beaing Aangement fo Main Spindles Typical examples of beaing aangements fo main spindles of machine tools ae summaized in Table 5.1. An optimal beaing aangement must be detemined though consideations about the popeties equied of the main spindle in question (maximum speed, adial and axial igidities, main spindle size, equied Table 5.1 Typical examples of beaing aangements fo main spindles accuacies, lubication system, etc.). Recently, an inceasing numbe of new machine tool models incopoate built-in moto type main spindles. Howeve, heat geneation on a built-in moto can affect the accuacy of the main spindle and pefomance of lubicant, so a main spindle beaing should be selected vey caefully. Beaing aangement fo main spindle Beaing type Typical applications Gea-diven configuation [Type!] Tapeed olle beaing + Tapeed olle beaing + Double-ow cylindical olle beaing Lage tuning machine Oil county lathe Geneal-pupose tuning machine Typical lubication Gease lubication Belt-diven configuation Belt-diven configuation [Type@] Double-ow cylindical olle beaing + Double-diection angula contact thust ball beaing + Double-ow cylindical olle beaing [Type#] Double-ow cylindical olle beaing + High-speed duplex angula contact ball beaing fo axial load + Single-ow cylindical olle beaing NOTE: high-speed vaiant of type@ CNC tuning machine Machining cente Boing machine Milling machine Typical lubication Gease lubication CNC tuning machine Machining cente Milling machine Typical lubication Gease lubication Belt-diven configuation Built-in moto-diven configuation [Type $] Duplex angula contact ball beaing (DBT aangement) + Double-ow cylindical olle beaing NOTE: high-speed vaiant of type@o # [Type %] Double-ow cylindical olle beaing + High-speed duplex angula contact ball beaing fo axial load + Single-ow cylindical olle beaing NOTE: high-speed vaiant of type#with built-in moto-diven configuation CNC tuning machine Machining cente Milling machine Typical lubication Gease lubication CNC tuning machine Machining cente Milling machine Typical lubication Gease lubication Ai-oil lubication 22

27 Technical Data Beaing aangement fo main spindle Beaing type Typical applications Built-in moto-diven configuation Built-in moto-diven configuation Built-in moto-diven configuation [Type ^] Single-ow cylindical olle beaing + High-speed duplex angula contact ball beaing fo axial load + Single-ow cylindical olle beaing NOTE: high-speed vaiant of type % [Type &] Duplex angula contact ball beaing (DTBT aangement) + Single-ow angula contact olle beaing (w/ ball slide) NOTE: supe high-speed vaiant [Type *] Duplex angula contact ball beaing (DTBT aangement) + Duplex angula contact olle beaing (w/ ball slide) NOTE: supe high-speed vaiant CNC tuning machine Machining cente Typical lubication Gease lubication Ai-oil lubication Machining cente <vetical> Typical lubication Gease lubication Ai-oil lubication Machining cente <vetical> Typical lubication Gease lubication Ai-oil lubication Built-in moto-diven configuation Built-in moto-diven configuation [Type (] Duplex angula contact ball beaing (DTBT aangement) + Single-ow cylindical olle beaing NOTE: supe high-speed vaiant [Type )] Adjustable peload beaing unit + Duplex angula contact ball beaing (DBT aangement) + Single-ow cylindical olle beaing NOTE: high-igidity/supe high-speed vaiant Machining cente Typical lubication Gease lubication Ai-oil lubication Machining cente Typical lubication Ai-oil lubication Built-in moto-diven configuation [Type)!] Duplex angula contact ball beaing (DT aangement) + Duplex angula contact ball beaing (DT aangement) Machining cente Small tuning machine Ginding machine Typical lubication Gease lubication Ai-oil lubication Belt-diven configuation [Type )@] Duplex angula contact ball beaing (DT aangement) + Duplex angula contact ball beaing (DT aangement) Ginding machine Typical lubication Gease lubication Ai-oil lubication Oil-mist lubication 23

28 Technical Data 2 Beaing selection based on beaing aangement fo main spindle An optimal beaing poduct that best suits the application is selected by efeing to the beaing selection table in Table 5.2, which contains the possible beaing aangements fo main spindles. Designate the fee side and fixed side. Select the beaing aangement type (I to XII) on the fee o fixed side. Select a set of beaing specifications applicable to the selected aangement type. Choose a lubication system suitable fo the selected beaing specifications. Select a poduct goup that satisfies the abovementioned consideations. Table 5.2 Beaing selection table Fix side Duplex angula contact ball beaing o adjustable peload beaing mechanism + Duplex angula contact ball beaing Fee side Single-ow angula contact ball beaing o duplex angula contact ball beaing (w/ ball bush) Beaing aangement Beaing aangement [Type &, *, )!, [Type $&*( o )@] )!o )@ Cylindical olle beaing + Duplex angula contact ball beaing Beaing aangement [Type@,#,% o ^] Tapeed olle beaing + Cylindical olle beaing Beaing aangement [Type!] Double-ow cylindical olle beaing o single-ow cylindical olle beaing Beaing aangement #,$, %, ^, (, o )] Beaing specifications Angula contact ball beaing fo adial load Contact angle 3 o smalle Cylindical olle beaing Angula contact ball beaing fo axial load Contact angle less than 6 Thust contact ball beaing Cylindical olle beaing Lubication system Ai-oil lubication Oil lubication Gease lubication Gease lubication Gease lubication Sealed Applicable poduct goups/ultage Steel balls/ceamic balls 15 78C, 72C 15, 25, 3 79U/5S-79U7U/5S-7U 15, 2, 25 2LA-HSE9U/5S-2LA-HSE9U 2LA-HSE/5S-2LA-HSE Ginding machine main spindle/ moto shaft seies 15 BNT9/5S-BNT9 BNT/5S-BNT BNT2/5S-BNT2 Supe high-speed/dedicated ai-oil lubication seies 25 5S-2LA-HSF Eco-fiendly type 2, 25 5S-2LA-HSL9U 5S-2LA-HSL 5S-2LA-HSFL With e-lubicating hole on the oute ing 2, 25 5S-2LA-HSEW9U 5S-2LA-HSEW Double-ow Single-ow 15, LLB/5S-79 LLB 7 LLB/5S-7 LLB 15, 2, 25 2LA-BNS9 LLB/5S-2LA-BNS9 LLB 2LA-BNS LLB/5S-2LA-BNS LLB NN3/NN3K NN3HS/NN3HSK NN3HST6/NN3HST6K NN3HSRT6/NN3HSRT6K NN49/NN49K NNU49/NNU49K N1HS/N1HSK N1HSRT6/N1HSRT6K Eco-fiendly type N1HSLT6/N1HSLT6K 3 HTA9A HTAA/5S-HTAA 4 HTA9U HTAU/5S-HTA /5629M 562/562M 329XU 4T-32X/32XU Inch seies tapeed olle beaing Consideations fo selection pocedue Beaing selection High-speed pefomance (geneal) HighLow Contact angle 15, 2, 25, 3 Rigidity Radial igidity HighLow Contact angle 15, 2, 25, 3 Axial igidity LowHigh Contact angle 15, 2, 25, 3, 4, 6 Complex igidity (adial and axial) High (4-ow) Medium (3-ow) Low (2-ow) Recommended aangement 4-ow (DTBT) o 2-ow (DB) Recommended lubication specifications Standad main spindle : Gease High-speed main spindle : Ai-oil Low-noise : Gease o eco-fiendly ai-oil Pesence of cooling jacket aound the beaing. In paticula, gease lubication is ecommended. 24

29 Technical Data 3 Adjustable peload beaing unit A ecent tend in the machine tool industy is a steady incease of opeating speeds. The maximum dmn value (pitch cicle diamete acoss olling elements dm[mm] multiplied by speed n[min -1 ]) eached by main spindles with ai-oil lubicated lubication can be as high as 2.5 to At the same time, main spindles ae equiing inceased igidity. Theefoe, main spindle beaings must be capable of both high-speed opeation and high igidity. This can be achieved though optimal peloading. A fixed peload (sping peload) system is usually employed to satisfy both these high speed and high igidity equiements. A spindle unit with fixed-position peload that is adjustable fo diffeent speed conditions is advantageous fo optimizing the igidity of the unit. The NTN Adjustable Peload Beaing Unit is a highspeed, high-igidity unit that featues fixed position peload that can be adjusted fo diffeent speed conditions. The NTN Adjustable Peload Beaing Unit is illustated in Fig Hydaulic pessue is used to shift the position of the adjustable peload sleeve situated in the ea beaing section of the unit. This changes the peload on the beaings. A spindle incopoating a 3-step adjustable peload beaing unit is illustated in Fig The sleeve in the adjustable peload section is compised of two hydaulic pessue chambes, A and B, as well as a spial goove fo sliding motion. The peload can be adjusted to one of thee settings by changing the hydaulic pessue in each of the chambes. To achieve instantaneous and eliable adjustment, high-pessue oil (at the same pessue as in the hydaulic chambes) is supplied to the spial goove on the outside of the sleeve. This oil povides lubication so that the sleeve can move smoothly. Angula contact ball beaing with ceamic balls Adjustable peload section Adjustable peload sleeve Hydaulic pessue chambe A Hydaulic pessue chambe B Hydaulic pessue in spial goove (fo sliding motion) Adjustable peload unit Wok piece side Locating side beaing Peload adjustment side beaing Dive side Beaing box Main spindle Angula contact ball beaing with ceamic balls Fig. 5.1 Adjustable peload beaing unit Low speed ange (high peload) Medium speed ange (medium peload) High speed ange (low peload) Spial goove Hydaulic pessue ON (Positive sign means cleaance, while negative sign means peload.) Hydaulic pessue ON (Positive sign means cleaance, while negative sign means peload.) Hydaulic pessue OFF (Positive sign means cleaance, while negative sign means peload.) L2 L1 Fig. 5.2 Typical spindle configuation incopoating 3-step Adjustable Peload Type Beaing Unit Opeating mechanism Fig. 5.3 shows the hydaulic opeation of the unit fo thee peloading conditions as well as the associated motion of the adjustable peload sleeve. Low speed opeation(high peload): Chambe A is pessuized. Component 1 moves to the ight by a peset cleaance L1 and contacts component 3. The axial cleaance is δ1. Medium speed opeation(medium peload):chambe B is pessuized. Components 1 and 2 move to the ight by a peset cleaance L2, causing Component 2 to contact Component 4. The axial cleaance isδ2. High speed opeation(low peload):chambes A and B ae not pessuized. Components 1 and 2 etun to the left due to the eaction foce on the beaing. This causes Component 2 to contact Component 5, theeby etuning the axial cleaance to the initial setting ofδ3. NOTE: The etun motion of the components 1 and 2 is achieved by the eaction foce of beaing o a sepaately povided sping. Fig. 5.3 Opeating mechanism of Adjustable peload 25

30 Technical Data 4 Beaing jacket cooling system With a built-in moto dive system, the main spindle is diectly diven by a moto and is theefoe suitable fo apid acceleation o deceleation. Howeve, this system can be advesely affected by tempeatue ise. A cooling jacket with a spial goove aound the housing allows cooling oil to flow though the unit. If heat geneated by the moto affects the beaing, oveheating of the beaing as well as degadation of the gease can occu. This situation must be stictly avoided. When designing a cooling system with jacket cooling, the following should be consideed. Consideations about cooling of jacket A typical beaing aangement is shown in Fig. 5.4 and 5.5, compising a double-ow cylindical olle beaing and an angula contact ball beaing set. The cooling goove on the jacket in Fig. 5.4 stats at aound an aea above the angula contact ball beaings and does not cool the double-ow cylindical olle beaing effectively. (Note that the fit of the angula contact ball beaings with the boe of the housing is a cleaance fit-the beaings ae not in diect contact with the housing) In the configuation in Fig. 5.5, the cooling goove extends to the egion above the double-ow cylindical olle beaing, and cools both the angula contact ball beaings and the double-ow cylindical olle beaing effectively. IN OUT Cooling goove on jacket IN Cooling goove on jacket OUT Fig. 5.4 Inadequate cooling goove on jacket Fig. 5.5 Adequate cooling goove on jacket Test conditions Test beaing Peload afte assembled Lubication system 5S-2LA-HSE14DB 1N (Fixed position peloading) Ai-oil lubication Test conditions Test beaing Mounted adial cleaance Lubication system NN328HST7-5µm Gease lubication Tempeatue incease on oute ing C w/ jacket cooling w/o jacket cooling Speed min -1 Tempeatue incease on oute ing C w/ jacket cooling w/o jacket cooling Speed min dmn value 1 4 Fig. 5.6 Vaiation in beaing tempeatue depending on pesence/absence of jacket cooling (angula ball beaing) dmn value 1 4 Fig. 5.7 Vaiation in beaing tempeatue depending on pesence/absence of jacket cooling (cylindical olle beaing) 26

31 Technical Data 6. Handling of Beaings 1 Cleaning and filling with gease To achieve maximum speed and limited tempeatue ise with a pecision olling beaing, it is vital to handle the beaing coectly. The handling of beaings involves cleaning, dying, filling with gease (if necessay), and the unning-in opeation. Fo each step, follow the pecautions and instuctions. A sealed beaing contains pefilled gease. Do not clean (inse) and dy this type of beaing. Only wipe away ustpeventive oil with a clean cloth befoe assembling the beaing. Cleaning (emoval of ust-peventive oil) Immese the beaing in keosene o a highly volatile solvent such as naphthesol and wash it by hand. Then emove the keosene using benzene o alcohol. Use clean compessed ai to blow away the insing fluid. (The beaing may be used as deliveed fo the ai-oil lubication. Howeve, we ecommend that afte cleaning, the beaing eithe be coated with the lubicant to be used o a less viscous oil, o be immesed in the lubicant o othe low-viscosity oil.) Dying If the beaing is to be used with gease lubication, it is necessay to thooughly dy the beaing to avoid leakage By using an injecto o small plastic bag, fill gease between balls in equal amounts, aiming at the olling suface of the inne ing. of gease. Afte dying, be sue to immediately fill the beaing with gease. Dying can be pefomed by blowing hot ai onto the beaing o placing the beaing in a chambe at constant tempeatue. When dying by hot ai, be sue to conside the cleanliness of the ai. Filling with gease The pocedues fo geasing ball and olle beaings can be found below. Afte filling with gease, tun the beaing by hand to unifomly distibute the gease to the whole olling suface. <Ball beaings> See Photo 6.1 By using an injecto o small plastic bag, fill gease between balls in equal amounts, aiming at the inne ing olling suface. Fo a beaing with a ing-guided cage, also apply gease to the guide suface of the cage using a spatula o simila tool. If gease cannot be filled into the inne ing olling suface because of a small gap between the cage and the inne ing add gease to the oute ing olling suface. In this case, caefully tun the beaing so that the gease is fully spead on the inne ing side. <Rolle beaings> See Photo 6.2 Apply gease to the oute (inne) side of olles, and while tuning the olles with finges, spead the gease to the inne ing (oute ing) side. Apply gease to the oute cicumfeence of cage. Afte completion of filling Apply gease to the oute side of the olles, and while tuning the olles with finges, spead the gease to the inne ing (oute ing) side. Tun the beaing by hand while applying an appopiate load in the contact angle diection so that the any aea in the inteio of beaing is sufficiently lubicated with gease. (Afte applying gease) If a lump of gease emains on the oute face of cage ib, the unning-in opeation can take a longe time. With finges, spead the gease deposited on the oute suface of the ib on the cage. Photo. 6.1 Filling gease into angula contact ball beaing Photo. 6.2 Filling gease into cylindical olle beaing 27

32 Technical Data Running-in opeation (1) Ai-oil o oil-mist lubication The unning-in opeation is elatively simple with oil lubication because no peak tempeatue occus and the beaing tempeatue stabilizes within a elatively shot time. NTN ecommends that the speed of beaing is to be inceased in steps of 2 to 3 min -1 until the maximum speed is eached. Evey speed setting should be maintained fo about 3 minutes. Howeve, fo the speed ange whee the dmn (pitch cicle diamete acoss olling elements multiplied by speed) exceeds 1,,, incease the beaing speed in steps of 1 to 2 min -1 to ensue the stable unning. (2) Gease lubication Fo a gease-lubicated beaing, a unning-in opeation is vey impotant in attaining stable tempeatue ise. Duing a unning-in opeation, a lage tempeatue ise (peak) occus while the beaing speed is inceased, and then the beaing tempeatue eventually stabilizes. Befoe tempeatue stabilization, a cetain lead time will be needed. Ball beaing NTN ecommends that the beaing speed be inceased in steps of 1 to 2 min -1 and be futhe inceased only afte the tempeatue has stabilized at the cuent speed setting. Howeve, fo the speed ange whee the dmn exceeds 4,, incease the beaing speed in steps of 5 to 1 min -1 to ensue the stable unning. Rolle beaing Compaed with contact ball beaings, the time to peak tempeatue o satuation in unning-in opeation of olle beaings tends to be longe. Also, thee will be tempeatue ise due to whipping of the gease and the tempeatue ise may be unstable. To cope with this poblem, un the olle beaing in the maximum speed ange fo a polonged peiod. Incease the beaing speed in steps of 5 to 1 min -1 only afte the beaing tempeatue has stabilized at the cuent speed setting. Fo the speed ange whee the dmn exceeds 3,, incease the beaing speed in steps of 5 min -1 to ensue safety. 2 Mounting When mounting a beaing to a main spindle, follow eithe of the mounting techniques descibed below (1) Pess-fitting with hydaulic pess (2) Mounting by heating beaings With eithe technique, it is impotant to minimize the advese effects of the mounting pocess to maintain beaing accuacy. (1) Pess-fitting with hydaulic pess Befoe pess-fitting a beaing with a hydaulic pess o hand pess, the pess-fitting foce due to the intefeence between the shaft and inne ing must be calculated. A hydaulic pess having a capacity geate than the equied pess-fitting foce must used. Next, using an inne ing pess-fitting jig, the inne ing is coectly pess-fitted to the shoulde of shaft. Please be caeful not to exet a foce on the oute ing. Afte the pess-fitting opeation, it is impotant to measue the accuacies of vaious potions of the beaing to veify that the beaing has been coectly mounted to the shaft. When using a multi ow beaings, measue the unout afte assembly and coect misalignment acoss the oute ings as necessay. Hydaulic pess Pess-fitting jig Fig. 6.1 Pess-fitting pessue Shaft otation Fig. 6.2 Checking fo face unout of inne ing Measuement of concenticity of oute ing Fig. 6.3 Checking fo concenticity of oute ing Calculation of pess-fitting foce The pess-fitting foce occuing fom the intefeence between the shaft and inne ing can be detemined by the fomula given below. Accoding to the calculated pess-fitting foce, a hydaulic pess having a sufficiently lage capacity must be used to mount the beaing. The vaiations in dimensional eos among the beaings should be consideed. The foce needed to pess the inne ing to the shaft can be obtained with the following fomula (6.1). Foce to pess-fit inne ing to shaft Kd=μ P π d B (6.1) whee, Kd: Foce fo pess-fitting o extacting an inne ing N P : Suface pessue on fitting suface MPa (see Table 6.1) d : Shaft diamete, inne ing boe diamete mm D : Oute ing outside diamete mm B : Inne ing width μ: Sliding fiction coefficient (when pess-fitting inne ing ove cylindical shaft:.12) 28

33 Technical Data Table 6.1 Fitting conditions and calculation fomulas Symbol (unit N [kg]-mm) Fits between solid steel shaft and inne ing d : Shaft diamete, inne ing boe P E deff d do : Hollow shaft boe 2 d Di diamete diamete Di :Inne ing aveage aceway goove Fits between hollow steel shaft and inne ing diamete 2 2 E deff1dodi 1doddeff : Effective P 2 intefeence 2 d 1doDi MPa E : Modulus of Kgf mm longitudinal elasticity = 21 GPa Fitting suface pessue d Δdeff = Δd (6.4) d+2 (In the case of a gound shaft) Δd : Theoetical intefeence fitting 4d+D D i=1.5 (6.5) 5 d Fig. 6.4 Example of calculation fo pess-fitting foce The calculation fo pess-fitting foce fo tight fit of 2 μm intefeence between the shaft and inne ing fo the standad angula contact ball beaing is as summaized below: 72UC (φ1 φ15 24) Intefeence fit of 2μm (solid shaft) 1 Δdeff=.2= Di=1.5 = P= [1 ( ) 2 ]=.52 MPa Kd= π 1 24=47 N B d Di (2) Mounting by heating beaings When mounting a beaing to a shaft using a constant tempeatue chambe, beaing heate o the like, follow the instuctions below. Heat the beaing at a tempeatue that eflects the intefeence between the shaft and inne ing (see Fig. 6.5). Assuming linea expansion coefficient , heating tempeatueδt, inne ing boe diamete φd, and intefeence fit δ= d ΔT Ex.) If φd = 1 mm, and δ=.3 (3 μm, tight fit), then the equied heating tempeatue ΔT = 23.8 C. Theefoe, the beaing should be heated to appoximately oom tempeatue + 3 C. Note that in pactice, the lowe-tempeatue shaft will cool the beaing, causing it to shink. Consequently the beaing may need to be heated by moe than 3 C fo assembly. NOTE If a esin mateial is used fo the cage of angula contact ball beaing, do not excessively heat the beaing (appox. 8 C max.). As a esult of heating beaings afte cooling, the inne ing will axially shink, and thee will be cleaance between the beaing side face and shaft shoulde (Fig. 6.6). Fo this eason, keep the beaing and shaft foced togethe with a pess o the like afte the unit etuns to nomal tempeatue. Afte cooling, check that the beaing is mounted to the shaft coectly. When using a beaing heate, be sue to avoid oveheating. To pevent beaing fom being magnetized, use equipment that has a demagnetizing featue. Diametic expansion of inne ing boe m Diffeence in tempeatue befoe and afte heating the beaing 9 C k5 j5 8 C 7 C 6 C Beaing boe diamete mm Fig. 6.5 Requied heating tempeatue fo mounting by heating inne ing Remaks: The maximum intefeence amounts ae intefeence values associated with class beaings. 6 p6 n6 m6 5 C 4 C 3 C Max. intefeence amount m To accommodate fo vaiation in the lubication conditions, incopoate a safety facto of 2 to 3. As a esult, the equied pess-fitting foce is: 47 (2 to 3) = 94 to 141 N Afte cooling Shinkage Fig. 6.6 Cooling afte mounting by heating beaings 29

34 Technical Data 3 Tightening of inne ing When mounting and secuing a beaing to a main spindle, the inne ing side face is usually clamped with a stepped sleeve o pecision beaing nut, and the font cove situated on the oute ing side face is bolted down. When utilizing a stepped sleeve o pecision beaing nut to clamp the inne ing, the following pecautions must be followed. Tightening with stepped sleeve The stepped sleeve is designed that the hydaulically expanded sleeve is inseted ove the shaft, and a pedetemined dive-up foce (tightening foce) is applied to the shaft. Then the hydaulic pessue is eleased in ode to secue the sleeve onto shaft and povide a tightening foce to the beaing. This technique is a elatively simple locking method (Fig. 6.7). Note howeve afte being locked in position by intefeence with the shaft, the sleeve can come loose because of deflection of the shaft o a moment load applied to the shaft. Fo this eason, in many cases, a stepped sleeve is used togethe with a beaing nut as illustated in Fig Stepped sleeve Application of tightening foce Hydaulic pessue Fig. 6.7 Tightening with stepped sleeve Stepped sleeve Pecision beaing nut Fig. 6.8 Tightening with stepped sleeve + pecision beaing nut Tightening with pecision beaing nut Requied tightening foce is achieved with the pecision beaing nut (pecision locknut) by coectly contolling the tightening toque. Note that when a beaing has been locked with a pecision beaing nut (lock nut), the nut can develop inclination owing to the cleaance on the theaded potions. If this poblem occus, fine adjustment will be necessay to obtain necessay unning accuacy fo the shaft. Locking setscew Pecision lock nut Coelation between tightening toque and tightening foce with pecision beaing nut The coelation between tightening toque and tightening foce with a pecision beaing nut can be defined with the fomula given below. Because the thead face of the pecision beaing nut, the thead face of the shaft and the beaing suface and nut constitute sliding sufaces, the coelation between tightening toque and tightening foce will vay depending on the fiction coefficient. Theefoe, the nut needs to be thooughly un on the shaft thead in advance to ensue smooth and unifom tightening. It is also necessay to detemine the coelation between tightening toque and tightening foce by using a load washe o the like in advance. M F= (6.6) (d/2)tan(β+ρ)+ nμ n F :Thead tightening foce N M :Nut tightening toque N-mm d :Effective diamete of thead mm ρ :Fiction angle of thead face μ tan ρ= (6.7) cos α β :Lead angle of thead tan β=numbe of theads pitch/πd (6.8) n :Aveage adius of beaing nut suface mm μn:fiction coefficient of beaing nut suface μn =.15 μ :Fiction coefficient of thead face μ =.15 α :Half angle of thead Example calculation Beaing nut AN2 (Fig. 6.1) Thead data M1 2 (class 2 thead) Effective diamete d=φ98.71 mm 11 Half angle of thead α= 3 Fig. 6.1 The coelation between a tightening toque and tightening foce with the pecision beaing nut can be calculated as follows:.15 tan ρ= ρ=9.826 cos3 1 2 tan β= β=.37 π (11+12)/2 n= = M F tan M Fig. 6.9 Tightening with pecision beaing nut 3

35 Technical Data 4 Elastic defomation of space by tightening foce When incopoating a beaing into a main spindle, the beaing must be coectly foced into a pedetemined position and maintained with a pedetemined beaing pessue in ode to maintain appopiate accuacies, cleaances and igidities of the beaing and main spindle. When axially locating a duplex angula contact ball beaing by using a beaing space the coss-sectional aea of space as well as (depending on the tightening foce) the beaing pessue and elastic defomation by tightening of the space must be consideed. Coelation between inne ing space tightening foce and amount of elastic defomation When secuing an angula contact ball beaing onto a main spindle, the beaing inne ing is tightened and locked by the shoulde of main spindle and a beaing nut and/o stepped sleeve. This inne ing tightening foce causes the space to develop elastic defomation in the axial diection, vaying the axial cleaance on the beaing. In the case of a back-to-back duplex beaing (DB, DTBT o DBT) fo a main spindle in paticula, the inne ing tightening foce will decease the beaing cleaance, possibly leading to an inceased postassembly peload and opeating peload. A possible inne ing tightening foce-deived axial defomation can develop in the fom of defomation of both the inne ing and inne ing space. Howeve, NTN's expeience has shown that only the elastic defomation on inne ing spaces needs to be consideed. Inne ing tightening foce Elastic defomation Fig Elastic defomation of inne ing space The amount of defomation of a space is calculated using the following fomula: P L δ= (6.9) A E δ :Elastic defomation mm P :Inne ing tightening foce N L :Inne ing space width mm A :Inne ing coss-sectional aea mm 2 E :Young's modulus 21, MPa The equie tightening foce exeted onto inne ing spaces vaies depending on the beaing manufactue. Fom its expeience, NTN adopts the typical values listed in Table 6.2. Table 6.2 Nut tightening foce Beaing boe diamete (mm) Nut tightening foce (N) NOTE 1) NTN has specified the nut tightening foces in this table based on expeiences fom eviewing and assessing the dawings fom uses. Howeve, NTN has no poduction ecod fo boe diamete of 22 mm o lage. Thus, the nut tightening foces in paentheses ae estimated values. NOTE 2) Fo ball scew suppot beaings (BST), a tightening toque appoximately 3 times as lage as the peload is ecommended. 5 Font cove dive-up Font cove dive-up (mm) When mounting and secuing a beaing onto a main spindle, the inne ing is usually tightened with a stepped sleeve o pecision beaing nut and the oute ing side is bolted down. When locking the oute ing with a font cove, the following points need to be consideed. Font cove pessing amount The beaing oute ing is tightened and locked between the shoulde of the housing and font cove at the main spindle font section. The font cove is installed by utilizing bolt holes (6 to 8 positions) on its flange. The usual pessing allowance on the oute ing and the font cove, which NTN has adopted though expeience, falls in a ange of.1 to.2 mm. Too lage a pessing amount on the oute ing o a smalle numbe of fastening bolts may lead to poo oundness of the beaing ing. Typical fit and deteioation in oundness of a aceway suface esulting fom a pessing amount of.5 mm on the oute ing ae shown in Fig Also, typical oute ing pessing amount and deteioation of a aceway suface with a fit of 5μm loose ae povided in Fig

36 Technical Data To avoid defomation of the oute ing aceway suface, NTN ecommends that the oute ing be installed to a highly accuate housing in tansition fit with a lage numbe of bolts. 1 12(=.1 to.2 mm is ecommended) 2 Locked with bolt Deteioation in oundness of aceway suface (m) Fit: 5 m loose Bolt tightening toque: 2 kn-cm Bolts, 2 pos. Bolts, 6 pos Pessing allowance on oute ing (mm) Font cove Fig Pessing allowance on oute ing vs. deteioation in oundness of aceway suface Fig Font cove pessing allowance 6 Checking axial igidity In the typical method fo checking fo the axial igidity of a beaing installed to a machine tool, the main spindle itself is pushed with a push-pull gage to measue the esultant axial displacement. A method using a dial indicato is descibed below. Two dial indicato ae placed on two locations (axisymmetic locations sepaated by 18 ) at the leading end of the main spindle. Use magnetic stands to secue the dial indicato to the end face of housing. Then, apply the load onto the main spindle and the esultant axial displacement is measued. Fig Measuing position fo oundness on oute ing aceway suface Shaft end of main spindle Dial indicato Hydaulic cylinde Deteioation in oundness of aceway (m) Pessing amount on oute ing:.5 mm Bolt tightening toque: 2 kn-cm Bolts, 2 pos. Bolts, 6 pos Fitting amount allowance between beaing outside suface and housing (m) Dial indicato Photo 6.3 Fig Effect of fit of oute ing on oundness of aceway suface Measuing load (push-pull gage etc.) Dial indicato Dial indicato Fig Checking fo axial igidity 32

37 Technical Data 7 Cleaance adjustment fo cylindical olle beaing When incopoating a cylindical olle beaing into a main spindle of a machine tool such as an NC tuning machine o machining cente, and setting the intenal cleaance to zeo o to a negative cleaance, the inne ing of the beaing usually has a tapeed boe. The intenal cleaance is adjusted by fitting the tapeed boe beaing onto the tapeed potion of the main spindle and diving the beaing in the axial diection to expand the inne ing. Fo adjusting the intenal cleaance, two methods ae available: a method consisting of cleaance measuement fo each beaing and adjustment with a space(s), and a method with a post-mounting intenal cleaance adjustment gage. Method with cleaance measuement and adjustment with space (s) Adjust the beaing intenal cleaance by following the pocedue descibed below: (1) Calculation of oute ing shinkage (see Fig. 6.17) Calculate the intefeence at the fitting aea Δdeff between the oute ing and housing. Measue the housing boe diamete fist, and then calculate the intefeence Δdeff fom the oute ing outside diamete listed on the beaing inspection sheet. EX. 1 Beaing oute ing outside diamete φ15 mm (Inspection sheet = -.5) Housing boe diamete D φ15 mm (measuement data = -.7) Intefeence at fitting aea Δdeff =.2 (2 μm tight) Calculate the oute ing shinkage ΔG with the fomula (6.1). Dh D D Housing Fig Fit between oute ing and housing D 1DDh 2 Gdeff 6.1 D 1DD 2 DDh 2 EX. 2 Housing outside diamete Dh=φ2, oute ing outside diamete D=φ15, oute ing boe diamete D = φ /2 2 G / /2 2 (2) Measuement of beaing position and beaing adial cleaance on a tempoaily mounted beaing Mount the beaing inne ing with the cage and olles onto the tapeed shaft (see Fig. 6.18). In this pocess, foce the inne ing until its tapeed boe face is fully seated, and then measue the distance between the shaft shoulde and inne ing side face (L1). NOTE: Afte mounting the inne ing, check that the beaing side face is squae to the main spindle centeline. At this point, mount the oute ing, move the oute ing up and down by hand and then measue the intenal cleaance afte mounting (Δ1)(see Fig. 6.19). Calculate the estimated beaing cleaance Δ1 afte pess-fitting the oute ing into the housing with the fomula (6.12). The esult of the calculation eflects the oute ing shinkage ΔG. Δ1=Δ1 ΔG (6.12) EX. 3 Intenal cleaance afte mounting Δ1=.3 Oute ing shinkage ΔG=.15 Estimated beaing cleaance Δ1 = =.285 (3) Adjustment of space width between shaft shoulde and inne ing To adjust the beaing cleaance to a pedetemined taget value (δ) afte mounting, detemine the space width Ln with the fomula (6.13) (efe to Figs. 6.2 and 6.21). Ln=L1+f(δ Δ1) (6.13) (n=2,3,4 ) The value f in the fomula (6.13) is found in the table below. L1 1 Ln n Table 6.3 Value f Value dmdi Value f Fig Measuement of beaing position Fig Measuement of beaing adial cleaance Fig. 6.2 Cleaance measuement afte insetion of space di dm Fig Explanation of dmdi 33

38 Technical Data EX. 4 In the case of NN32K, if d = dia.φ1, width B = 37, and di = d + 1/12 B/2, then di = dia.φ If the tageted post-mounting cleaance value δ=.15, L1 = 15, dm = dia.φ6, Δ1 =.285, then dm/di= 6/ =.599, and, theefoe, f = 17. Thus, the space width Ln between the shoulde and inne ing equivalent to δ=.15 will be the value shown by the fomula below: Ln=15+17 ( )= (4) Beaing cleaance measuement afte insetion of space (see Fig. 6.2) Inset a space that satisfies the space width Ln between the shoulde and inne ing detemined in the pevious step, and tighten the inne ing until the space does not move. Next, move the beaing oute ing up and down by hand and measue the intenal cleaance afte mounting (post-mounting intenal cleaance) Δn. The estimated beaing cleaance Δn afte pess-fitting of the oute ing into the housing is detemined with the fomula below: (n=2,3,4 ) Δn=Δn ΔG (6.14) (5) Final adjustment fo space width Repeat the steps (3) and (4) above to gadually decease the space width Ln so as to adjust the postmounting beaing cleaance to the tageted cleaance. By plotting the coelation between the space width and post-mounting cleaance as illustated in Fig. 6.22, the space width fo the final tageted cleaance will be moe eadily obtained. Positive cleaance: All olles ae sliding athe than olling. Cleaance = : About half of the olles ae olling but the est ae sliding. Negative cleaance: All olles ae olling. Measuement with mounted intenal cleaance gage The mounted intenal cleaance gage has a cylindical ing, which has a cut-out so that the ing can be opened and closed. The boe suface of the ing is used as a location fo measuement. The cleaance at the location fo measuement is popotional to the eading on the dial indicato. As illustated in Fig. 6.23, the cleaance gage consists of a ing gage, dial indicato, and attachment components. Its fixtue potects the intefeence gage against possible defomation when not in use. Fo the measuing opeation, detach the fixtue. Dial indicato Gage suppot bolt Gage bolt Fixtue Open/close bolt NTN NN3XXK Ring gage Handle Fig Desciptions of vaious components on mounted intenal cleaance measuement gage Usage of mounted intenal cleaance gage (1) Measuement of oute ing aceway diamete (boe diamete) Mount the oute ing into the housing. (Fo easy mounting, heat the housing.) Wait until the tempeatue of the oute ing is same as that of the inne ing, and then measue the oute ing aceway diamete (boe diamete). Take measuements at seveal points and calculate the aveage, and then zeo the gage at this aveage value..4 Assembled cleaancemm Tageted value Photo Space width Lnmm Fig Coelation between space width Ln and post-mounting cleaance Δn 34

39 Technical Data (2) Setup of mounted intenal cleaance gage Place the cylinde gage, onto the boe suface of cleaance adjustment gage as shown in Photo 6.5, and adjust it with the open/close bolt so that its dial 1 is set to zeo (see Photo 6.6). When the eading of dial 1 of the cylinde gage is zeo, adjust the gage bolt so that the pointe of dial 2 points at the ed mak (coection amount of the gage). (Photo 6.6) With the gage bolt, adjust the gage so that the shot pointe is situated at the scale 2 position. (With the lage size, inset the pin into the hole of the open/ close bolt and make fine-adjustment.) NOTE 1) Photo 6.6 shows the inne ing and olles. When the coection amount of the gage is adjusted, adjust it only with the thickness gage. NOTE 2) The pointe of dial 2 is diected to the ed mak. The pupose of this is to compensate cleaance eo caused due to the stuctue of mounted intenal cleaance gage. The coection amount can vay fom gage to gage. NOTE 3) When the pointe of dial 2 is in line with the ed mak, the zeo eading on dial 2 coincides with the zeo beaing cleaance. (3) Setting up the mounted intenal cleaance gage on the main spindle Mount the inne ing onto the main spindle, and lightly tighten the beaing nut. Tightening the open/close bolt (see Fig. 6.23) on the cleaance adjustment gage will cause the gage boe to expand. With the gage boe expanded by about.15 mm, inset the gage into the outside diamete potion of the olle set in the inne ing. Be caeful not to damage the olles (Photo 6.7). Loosening the open/close bolt will cause the gage boe to shink. Loosen the open/close bolt to bing the gage boe into contact with the outside diamete of the ball set in the inne ing. Lightly swing the cleaance adjustment gage in the cicumfeential diection to stabilize the pointe on the dial indicato. the distance between the inne ing side face and shaft shoulde (dimensionrin Fig. 6.24). Measue this dimension in at least thee locations, and finally adjust the space widthrto the aveage of thee measuements. Loosen and emove the shaft nut, inne ing space and inne ing fom the main spindle. Dial 2 Photo 6.5 Photo 6.6 Dial 1 (4) Setup of inne ing cleaance Tighten the shaft nut of the main spindle. This should be done gadually to pevent shock loading. Tightening the nut futhe until the eading on the dial of the cleaance adjustment gage becomes zeo in case the cleaance is aimed at μm. Once the eading on gage gets zeo, caefully swing the adjustment gage again to check that the measuement value is coect. Loosen the open/close bolt on the cleaance adjustment gage to expand the gage boe and emove the gage fom the inne ing. R Photo 6.7 Shaft nut (5) Detemination of space width The inne ing should now be in the position whee the eading on the dial of cleaance adjustment gage was zeo in step (4). By using a block gage, measue Fig Space width dimension 35

40 Technical Data (6) Assembly and check of the mounted olle outside diamete Inset a space of widthr. Then inset the inne ing and mounting space and tighten the shaft nut. Accoding to a pocedue simila to that in steps (3) "Setting up the mounted intenal cleaance gage on the main spindle" and (4) "Setup of inne ing cleaance", check the mounted olle outside diamete and the cleaance setting. Note this pocess is only a e-check pocedue, and may be omitted once the cleaance measuements fall in a smalle ange. Cleaance coection facto and mounted intenal cleaance eading (1) Cleaance coection facto Because of the stuctue of the NTN mounted intenal cleaance adjustment gage, the atio of the cleaance eading on location fo measuement to the eading on dial indicato is 1:2.5 (cleaance indication facto). The cleaance eading on the dial indicato is 2.5 times as lage as the emaining intenal cleaance. Fo efeence, a cleaance eading convesion table is given in Table 6.4. NOTE: Note that the cleaance coection facto of cetain beaing numbes is not 1:2.5. Coection facto is given on the table of inspection esults. (2) Remaining intenal cleaance (whee cleaance indication value 1:2.5) The eading on the dial indicato is conveted into a mounted intenal cleaance in the following manne: CASE 1: The eading elative to the zeo point is in the clockwise diection (CW) (Fig. 6.25). The value of the mounted intenal cleaance (+) is 1/2.5 times as lage as the eading on dial gage. Reading on dial gage in Fig = 2.5 Remaining intenal cleaance = 2.5/2.5 = (+)1μm CASE 2: The eading elative to the zeo point is in the counteclockwise diection (CCW) (Fig. 6.26). The value of the mounted intenal cleaance (-) is Table 6.4 Cleaance eading convesion table Fig /2.5 times as lage as the eading on dial gage. Reading on dial gage in Fig = 5. Remaining intenal cleaance = 5./2.5 = (-)2μm Setup of mounted intenal cleaance When setting the mounted intenal cleaance to a specific negative o positive value, the zeo point on dial indicato by a value [tageted cleaance multiplied by 2.5] may be shifted pio to the setup of the cleaance adjustment gage. (In case that the mounted cleaance value is divided by the coection facto, it is not necessay to the value [tageted cleaance multiplied by 2.5]) (2.5: cleaance coection facto) Fig Adjustment fo negative cleaance (emaining intenal cleaance: -.8 μm) Fig Adjustment fo positive cleaance (emaining intenal cleaance: +1. μm) Pecautions fo using and stoing the mounted intenal cleaance adjustment gage When using the mounted intenal cleaance adjustment gage, follow the pecautions descibed below: When tansfeing the oute ing aceway diamete measued with the cylinde gage to the mounted intenal cleaance adjustment gage, use the adjustment gage in a vetical attitude (Photo 6.8). When not using the mounted intenal cleaance adjustment gage, place it in a hoizontal attitude (Photo 6.9). Also, afte completion of cleaance measuing opeation, apply ust-peventive oil to the intenal cleaance adjustment gage and stoe in a dy location. Fig.6.26 Reading on dial gage (m) Remaining intenal cleaance on location fo measuement (m) Reading on dial gage (m) Remaining intenal cleaance on location fo measuement (m) Photo 6.8 Vetical stoage attitude Photo 6.9 Hoizontal stoage attitude 36

41 Technical Data 8 Tapeed boe cylindical olle beaing and main spindle tape angle In ode fo a pecision beaing to pefom as designed, it must be coectly mounted to a shaft and housing. In paticula, when employing a tapeed boe cylindical olle beaing, accuate finish fo the tapeed main spindle and appopiate fit between the beaing boe and the main spindle ae vey impotant to ensue high accuacy of the main spindle. NTN ecommends that the custome use the NTN tapeed shaft ing gage, which that is finished to same accuacies as the beaing, so that the custome can achieve highe pecision. NTN also offes a plug gage so that the custome can check the accuacy of the ing gage. Tape gage fo pecision olle beaings Each NTN pecision cylindical olle beaing tape gage consists of a female gage and a male gage (plug gage) (Fig. 6.29). Using blue paste o an equivalent as well as a ing gage, check the fit of the beaing boe with the main spindle tape. The coect fit between the main spindle and the beaing leads to highe accuacy of the main spindle. The plug gage is intended to check the accuacy of the associated ing gage. Use the plug gage to veify the tape accuacies of the associated ing gage (Fig. 6.3). d1 B Tape 1/12 Plug gage (TA) d D d1 Fig Tape gage B Tape 1/12 d Ring gage (TB) Usually, Using blue paste between the tapeed boe of a cylindical olle beaing and a plug gage exhibits a stong contact mak on the small diamete side as show in Fig This is because NTN has slightly adjusted the tape angle of the beaing boe to accommodate fo the diffeence in thickness of the inne ing below each ow of olles. Fig Checking main spindle tape with ing gage When checking the main spindle tape angle with a ing gage, pefom the following steps. Thooughly clean the suface of the ing gage, and apply a thin laye of blue paste to fou equally-spaced points. Clean the tapeed suface of the shaft, and gently inset into the ing gage. The ing gage to be lightly tuning it. Check the pattens of blue paste deposited on the shaft suface. At this point, attach a stip of clea adhesive tape onto each blue paste spot, and peel off each stip. Attach stips of adhesive tape onto white pape and check how much blue paste was deposited onto each point. Check that moe than 8% of the applied blue paste was deposited on the tapeed suface. Fig Application of blue paste to ing gage Fig. 6.3 Blue paste on tape gage Tape angle NTN machines the tapeed boe of its cylindical olle beaings and the tape angle of its tape gages accoding to the toleances below: Nominal tape angle 1/12 (4 46' 18.8") Toleance fo pecision olle beaing with 1/12 tape angle is +12"±12" (JIS class 4 and 2) Tageted toleance fo tape gage 1/12 is +9. Table 6.5 Examples of blue paste ecods Region A SmallLage Region B Region C Region D SmallLage SmallLage SmallLage Small: small diamete side Lage: lage diamete side Fig Regions subjected to measuement with blue paste 37

42 Technical Data 9 Running-in opeation fo main spindle beaings Run-in is impotant fo ensuing smooth opeation of gease-lubicated main spindle beaings. The following two modes of unning-in ae ecommended: (1) The beaing speed is gadually inceased in steps. Afte the tempeatue is satuated at each speed setting, the speed is inceased to the next step (Fig. 6.34). (2) The beaing is un fo one minute at aound the maximum opeating speed of the spindel. This cycle is epeated two o thee times (Fig. 6.35) as needed. (1) is the odinay method used, howeve it takes slightly longe to each the maximum opeating speed of the spindel. In contast, (2) can shoten the unning-in time, howeve highe isk of sudden beaing tempeatue incease is consideable, so that unning speed and its holding time must be set caefully. OR tempeatue OR tempeatue Beaing Mounted peload Jacket cooling OR tempeatue Room tempeatue Speed Timeh Beaing Mounted peload Jacket cooling 5S-76CDLLBDB ows 18NFixed-position peload Yes 5S-2LA-BNS2LLBDB ows 4kNConstant pessue peload Yes OR tempeatue 4 1 Room tempeatue 2 Speed Timeh Speedmin -1 Speedmin -1 Geneally, the tempeatue of a main spindle beaing is measued on the font cove. The tempeatue diffeence acoss the beaing oute ing and font cove eaches 2 to 3 C, and at the same time, the tempeatue diffeence between the hottest olling element and the inne ing aceway suface seems to each 5 to 1 C. Fo this eason, NTN ecommends that the machine is stopped if the tempeatue on font cove eaches appoximately 6 C. The machine should be allowed to cool off befoe the unning-in opeation is estated. OR tempeatue Beaing NN32HSK11537 Mounted adial cleaance -5m Jacket cooling Yes Timeh Fig OR tempeatue Room tempeatue Speed Speedmin -1 Beaing NN32HSK11537 Mounted adial cleaance -5m Jacket cooling Yes 6 6 OR tempeatue OR tempeatue 1 Room tempeatue Speed Timeh Speedmin -1 Fig

43 Technical Data 7. Lubication of Beaings In a beaing, lubication foms a thin oil film on both olling and sliding sufaces to pevent metal-to-metal contact. The benefits of lubication can be summaized as follows: (1) Alleviation of fiction and wea (2) Removal of heat due to fiction (3) Longe beaing life (4) Rust pevention (5) Potection against contamination by foeign mateial high Tempeatue incease Tempeatue incease Oil volume Fig. 7.1 Fiction loss lage high Fiction loss To achieve the full lubicating effect, it is necessay to use a lubicating system suited to the opeating conditions, select a quality lubicant, emove dust fom the lubicant, and design an appopiate sealing stuctue to pevent contamination as well as lubicant leakage. The main spindle of a machine tool usually uses an extemely low volume of lubicant so heat geneation fom stiing of the lubicant is minimal. Fig. 7.1 summaizes the elationships between oil volume, fiction loss, and beaing tempeatue. The lubication methods available fo beaings in a machine tool include gease lubication, oil mist lubication, ai-oil lubication, and jet lubication. Each method has unique advantages. Theefoe, the lubicating system that best suits the lubication equiements should be used. Tables 7.1 and 7.2 summaize the featues of vaious lubication methods. Table 7.2 Evaluation of vaious lubicating systems Lubication method Citeion Gease lubication Oil mist lubication Ai-oil lubication Jet lubication Table 7.1 Oil volume, fiction loss and beaing tempeatue (Fig. 7.1) Zone Featues With an extemely low volume of oil, patial metal-to-metal contact occus between the olling elements and aceway suface, possibly leading to abnomal wea and beaing seizue. Typical lubication method Handling Reliability Tempeatue incease Cooling effect Sealing stuctue A unifom, uninteupted oil film is fomed. Fiction is minimal and beaing tempeatue is kept low. Gease lubication Oil mist lubication Ai-oil lubication Powe loss Even with a geate oil volume, heat geneation and cooling ae in balance. Ciculating lubication Envionmental contamination Allowable dmn value Tempeatue incease is constant egadless of oil volume. Ciculating lubication LegendExcellentGoodFaiPoo 1The pemissible dmn values ae appoximate values: dmn: pitch cicle diamete acoss olling elements [mm] multiplied by speed [min -1 ] A futhe incease in oil volume contibutes to a significant cooling effect, and the beaing tempeatue dops. Foced ciculating lubication Jet lubication 39

44 Technical Data 1 Gease lubication Gease lubication is the most common, as it simplifies the main spindle stuctue moe than othe lubicating systems. With an adequate amount of quality gease pefilled, this system can be used ove a wide ange of speed. The allowable maximum speed vaies with the type and size of beaing: fo a highspeed angula contact ball beaing, the dmn value should be as a guideline. Fo applications exceeding this ange, consult NTN Engineeing. Gease types A lithium-based gease, with a mineal oil base, is commonly used as a lubicant fo olling beaings. Its opeating tempeatue ange is -3 C to 13 C. When the tempeatue incease must be limited, as with the main spindle of a machine tool, NTN ecommends the use of a synthetic-oil-based gease (dieste, dieste+mineal oil) which penetation is NLGI gade 1 o 2. Table 7.3 lists technical data fo geases commonly used fo machine tool main spindles. Amount of gease equied Usually, a beaing fo the main spindle of a machine tool equies that gease volume be low so heat geneated by the stiing of the gease duing highspeed opeation is minimal. A guideline fo the amount of gease used fo a main spindle beaing is given below. Angula contact ball beaing (dmn value ); 15% of beaing fee space (dmn value > ); 12% of beaing fee space Cylindical olle beaing; 1% of beaing fee space Tapeed olle beaing; 15% of beaing fee space The space in the beaing typically used fo main spindles ae listed in dimension tables. Detemine a fill amount by efeing to the elevant dimension table. Befoe filling a beaing with gease, emove the ustpoof coating fom the beaing with clean wash oil and allow the beaing to dy completely. Then fill and unifomly distibute an appopiate amount of gease in the beaing with an syinge, plastic bag, etc. Table 7.3 Typical geases fo machine tool main spindle beaings Gease band SE-1 MP-1 ISOFLEX NBU15 Stabllugs NBU 8EP Multemp LRL3 Multemp PS2 ISOFLEX LDS18 Thickene Uea Ba complex soap Li soap Base oil Este Synthetic oil Este Mineal oil Synthetic oil Dieste+mineal oil Synthetic oil Base oil viscosity (4 C) mm 2 /S Dopping point C Opeating tempeatue ange C Application NTN gease code 512 Applied to ULTAGE Seies gease-lubicated sealed angula contact ball beaings L Applied to ULTAGE Seies gease-lubicated sealed angula contact ball beaings L Most commonly used fo main spindles 15K 3515 Suitable fo olle beaings subject to lage loads L Wide opeating tempeatue ange 12K 5513 Excellent low tempeatue and fiction chaactei- stics 1K 613 Suitable fo ball beaing 6K 4

45 Technical Data 2 Ai-oil lubication Ai-oil lubication (also known as oil-ai lubication o oil and ai lubication) is widely adopted fo main spindle beaings in ode to cope with the highe speed and pecision of machine tools and to ensue moe eliable lubication. Ai-oil lubication employs a method by which compessed ai is used to povide lubicating oil in pecisely contolled amounts. Geneally, an ai-oil lubication unit a volumetic piston-type distibuto that accuately metes the equied minimum amount of lubicating oil and povides it at optimal intevals contolled by a time. Special featues of ai-oil lubication Ai-oil lubication has the following advantages ove conventional oil mist lubication: Accuately supplies a minimal amount of oil. Can be adjusted to povide the pope amount of lubicant fo individual beaings. No limitations exist egading lubicant viscosity and exteme pessue additives. Compessed ai helps cool the beaing. Vaiations in the distance and height of lubication points do not affect lubication efficiency. Health hazads of oil mist ae minimized. Low oil consumption. Use of compessed ai can pevent contamination of the beaing by othe coolants. The ecommended oil viscosity is 1 to 32 mm 2 /s. Example of an ai-oil lubication unit Fig. 7.2 shows the stuctue of an ai-oil lubication unit. Ai Ai filte Solenoid valve (fo ai shut-off) Mist sepaato RV Ai-oil lubicating unit Pessue gauge Pump unit Pessue switch (ai) Pessue gauge Time Filte 1 Pessue switch (oil) Mixing valuve Oil/ai Oil Oil egulating valve Ai-oil lubication nozzle space Ai-oil lubication equies a specialized nozzle because it supplies the lubicating oil to the inside of the beaing by means of compessed ai. (Fig. 7.3) A nozzle with a hole diamete of 1. to 1.5 mm and a length 4 to 6 times the hole diamete is ecommended. Beaing Space with nozzle Fig. 7.3 Feed system fo ai-oil lubication Exhaust method fo ai-oil lubication Ai-oil lubication uses a lage volume of ai to feed lubicating oil to the beaing. Theefoe, it is essential that the ai fed into the beaing be allowed to escape. If the ai is not smoothly exhausted, the lubicating oil will emain in the beaing and possibly contibute to beaing seizue. In the design stage, emembe to allow ample space on the exhaust side of the beaing in ode to incease exhaust efficiency and povide a lage oil dain hole to ensue smooth aiflow. In addition, fo types that allow fo epositioning of the spindle, it is ecommended that the shoulde dimensions of all pats is designed to pevent lubicating oil fom flowing back into the beaing afte a change in the attitude of the main spindle. Unnecessay dimensional diffeences can also contibute to stagnancy of the lubicating oil. PSW Oil level switch Fig. 7.2 Ai-oil lubicating system 41

46 Technical Data Recommended tageted position with nozzle (1) Angula contact ball beaings Table 7.4 Ai-oil/oil mist nozzle space dimensions Note: Space dimensions ae the same fo all contact angles (15, 25 and 3 ). Table 7.5 Ai-oil/oil mist nozzle space dimensions Note: Space dimensions ae the same fo all contact angles (15, 2 and 25 ). Beaing No. A Oute diamete of Inne diamete of inne ing space oute ing space D E 79U 791U 792U 793U 794U 795U 796U 797U 798U 799U 791U 7911U 7912U 7913U 7914U 7915U 7916U 7917U 7918U 7919U 792U 7921U 7922U 7924U 7926U 7U 71U 72U 73U 74U 75U 76U 77U 78U 79U 71U 711U 712U 713U 714U 715U 716U 717U 718U 719U 72U 721U 722U 724U 726U Beaing No. HSE91U HSE911U HSE912U HSE913U HSE914U HSE915U HSE916U HSE917U HSE918U HSE919U HSE92U HSE921U HSE922U HSE924U HSE926U HSE928U HSE93U HSE932U HSE934U HSE1 HSE11 HSE12 HSE13 HSE14 HSE15 HSE16 HSE17 HSE18 HSE19 HSE2 HSE21 HSE22 HSE24 HSE26 HSE28 HSE3 HSE32 HSE34 A Oute diamete of Inne diamete of inne ing space oute ing space D E

47 Technical Data E A D Fig U, HSE, BNT and HTA types Table 7.6 Ai-oil/oil mist nozzle space dimensions Table 7.7 Ai-oil/oil mist nozzle space dimensions Note: Space dimensions ae the same fo all contact angles (3 and 4 ). Beaing No. BNT9 BNT91 BNT92 BNT93 BNT94 BNT95 BNT96 BNT97 BNT98 BNT99 BNT BNT1 BNT2 BNT3 BNT4 BNT5 BNT6 BNT7 BNT8 BNT9 BNT2 BNT21 BNT22 BNT23 BNT24 BNT25 BNT26 BNT27 BNT28 BNT29 A Oute diamete of Inne diamete of inne ing space oute ing space D E Beaing No. HTA92 HTA921 HTA922 HTA924 HTA926 HTA928 HTA93 HTA932 HTA934 HTA936 HTA938 HTA94 HTA6 HTA7 HTA8 HTA9 HTA1 HTA11 HTA12 HTA13 HTA14 HTA15 HTA16 HTA17 HTA18 HTA19 HTA2 HTA21 HTA22 HTA24 HTA26 HTA28 HTA3 HTA32 HTA34 A Oute diamete of Inne diamete of inne ing space oute ing space D E

48 Technical Data (a) When lubicant is supplied between the cage and inne ing E (b) When lubicant is supplied between the cage and oute ing E A D C B D Fig C, 79C, 7C and 72C types Table 7.8 Ai-oil/oil mist nozzle space dimensions Beaing No. 785C 786C 787C 788C 789C 781C 7811C 7812C 7813C 7814C 7815C 7816C 7817C 7818C 7819C 782C 7821C 7822C 7824C 7826CT1 7828CT1 783CT1 7832CT1 7834CT1 (b) When lubicant is supplied between the cage and oute ing B C Oute diamete of inne ing space Inne diamete of oute ing space D E CT1B 793CT1B 7932CT1B 7934CT1B

49 Technical Data 785C 7834CT1,7928CT1B 7934CT1B,72C 7218C B is ecommended. 728CT1B 74CT1B,7219C 7226C A is ecommended. If tageting at A is impossible, B is acceptable. If both A and B ae impossible, tageting fom C is acceptable. Table 7.9 Ai-oil/oil mist nozzle space dimensions Beaing No. 72C 721C 722C 723C 724C 725C 726C 727C 728C 729C 721C 7211C 7212C 7213C 7214C 7215C 7216C 7217C 7218C 7219C 722C 7221C 7222C 7224C 7226C (a) When lubicant is supplied between the cage and inne ing (b) When lubicant is supplied between the cage and oute ing Common to (a) & (b) Oute diamete of Inne diamete of Oute diamete of Inne diamete of A inne ing space oute ing space B C inne ing space oute ing space D E CT1B 73CT1B 732CT1B 734CT1B 736CT1B 738CT1B 74CT1B

50 Technical Data (2) Cylindical olle beaings E E E 1 C D B D A D Fig. 7.6 NN3 and NN3T6 types Fig. 7.7 N1HS type Table 7.1 Table 7.11 Oute diamete of Inne diamete of Beaing No. C inne ing space oute ing space D E NN35 NN36 NN37 NN38 NN39 NN31 NN311 NN312 NN313 NN314 NN315 NN316 NN317 NN318 NN319 NN32 NN321 NN322 NN324 NN326 NN328 NN33 NN332 NN334 NN336 NN (89) (143) 153 (152) 163 (162) NOTE) With cetain poducts, the dimension C of L1 cage diffes fom that of T6 cage. The values in paentheses ( ) ae dimensions C of L1 cages. Othe dimensions of L1 cages ae same as those of T6 cages. Beaing No. N16HS N17HS N18HS N19HS N11HS N111HS N112HS N113HS N114HS N115HS N116HS N117HS N118HS N119HS N12HS N121HS N122HS N124HS N126HS N128HS N13HS N132HS A B Oute diamete of Inne diamete of inne ing space oute ing space D E E A D Fig. 7.8 N1HSR type Table 7.12 Beaing No. N111 HSRT6 N112 HSRT6 N113 HSRT6 N114 HSRT6 N116 HSRT6 N118 HSRT6 N12 HSRT6 A Oute diamete of Inne diamete of inne ing space oute ing space D E

51 Technical Data 3 Jet lubication With this lubicating system, a high-speed jet of lubicant is injected into the beaing fom the side. This is the most eliable lubicating technique and is typically used on the main spindle beaings of jet engines and gas tubines. It is cuently capable of a dmn value of up to appoximately When used as a lubicating system fo the main spindle of a machine tool, it can minimize the tempeatue incease of the beaing. Howeve, the esultant toque loss is geat, as a lage amount of oil is supplied to each beaing. Theefoe, this aangement equies a poweful moto to dive the main spindle. Low viscosity oil (2-3 mm 2 /s) is used. Fig. 7.9 shows examples of the tempeatue incease with ai-oil lubication and jet lubication, while Fig. 7.1 gaphically plots test esults of powe loss. Beaing : 2LA-HSE2, boe 1 mm, outside diamete 15 mm Rolling element : Beaing steel Beaing : 2LA-HSE2, boe 1 mm, outside diamete 15 mm Rolling element : Beaing steel Tempeatue incease on oute ing C Ai-oil (Oil volume:.3 ml/min, ai: 75 NL/min) Jet (Oil volume: 3.1L/min) Powe loss kw / beaing Speed min -1 Jet (Oil volume: 3.1L/min) Ai-oil (Oil volume:.3 ml/min ai: 75 NL/min) Speed min dmn value 1 6 Fig. 7.1 Compaison of powe loss with ai-oil lubication and with jet lubication dmn value 1 6 Fig. 7.9 Compaison of tempeatue incease of oute ing with ai-oil lubication and jet lubication (The tempeatue incease with ai-oil lubication is elative to oom tempeatue; the tempeatue with jet lubication is elative to lubicant tempeatue.) 47

52 Technical Data 8. New Technologies 1 The new ULTAGE Seies of supehigh-speed pecision beaings fo machine tool main spindles NTN has esponded to need fo impoved efficiency, eliability, quality and envionmental esponsibility fo machine tools by developing the ULTAGE Seies of supe-high-speed pecision beaings. This new line of beaings demonstates excellent pefomance thanks to the optimal intenal design; a new appoach to suface quality; and the use of special mateials, special gease, and seals on both sides. "ULTAGE" is a new wod coined by combining Ultimate and Stage to stand fo NTN s wish to ealize the ultimate level of pecision beaing design. Fom low-speed heavy-duty machining to high-speed light -duty machining Impoved duability 2 New mateial and new suface modification technology The ULTAGE supe high-speed pecision beaing seies fo machine tool main spindles employs a special mateial that boasts excellent anti-seizue popeties and wea esistance, as well as a unique suface modification technique. Life unde nomal tempeatues The test esults obtained fom point contact test pieces unde geate loading ae gaphically plotted in Fig Test conditions Test piece Ball Max. contact stess Loading fequency Lubicant 1222 mm cylindical olle 19.53/4" 5.88 GPa 46,24 cycles/min Tubine VG56 (oil bath) Schematic of test ig Ball Impoved oundness with wok pieces Meets ISO 141 Test piece Concept Ou ideal is to offe a supe high-speed pecision beaing that offes excellent eliability while emaining eco-fiendly. Design The intenal beaing design has been optimized to cope with vaying applications and opeating conditions in ode to ealize high speed and high igidity, limited tempeatue incease, high pecision, enegy saving and low noise emission. It pefoms optimally in a vaiety of situations. Mateial Adoption of special mateial and a special suface modification technique has esulted in geatly enhanced eliability. Lubication Use of unique eco-conscious technology and special gease contibutes to deceased pollution and enhanced enegy savings. Pecision Ou supe high-pecision technology, in conjunction with ou poven pecision beaing technology, will help attain futhe impoved pecision. Cumulative pobability of failue (%) SUJ2 Special mateial No flaking SUJ2 Special mateial LifeLoading Cycle L1 (1 7 cycles) Life atio The olling fatigue life of the special mateial is appoximately 13 times as long as that of SUJ2. Fig. 8.1 Life test esults with point contact test pieces 48

53 Technical Data Life unde high tempeatue The test esults obtained fom thust-type test pieces at 2 C ae gaphically plotted in Fig Impoved wea esistance Test esults with a Sawin type fiction and wea test machine ae illustated in Fig Test conditions Test piece Ball Max. contact stess Loading fequency Oil tempeatue Lubicant Schematic of test ig 4729t7 flat plate 6.351/4"Ceamic ball 5.5 GPa 3, cycles/min 2 C Ethe-based oil Test conditions Speed Peipheal speed Test duation Max. contact stess Lubicant Rotating test piece Fixed test piece 4775 min -1 1 m/s 1 min 2. GPa VG2 Mateial being tested Si3N4 Schematic of test ig Rotating test piece Fixed test piece Special mateial mm 3 Ceamic ball SUJ mm 3 Cumulative pobability of failue (%) SUJ2 Special mateial No flaking SUJ2 Special mateial Life (loading cycles) L1 (1 5 cycles) 9.1 No flaking Test piece (flat plate) Life atio 1 3 Amount of wea The wea esistance of the special mateial is 6 times bette than that with SUJ2. Fig. 8.3 Test esults with Sawin type fiction and wea test machine Impoved anti-seizue popety Test esults with a two olle testing machine ae illustated in Fig Test conditions Diving side speed 2 min -1 Diven side speed 12 min -1 Sliding velocity 1.1 m/s Max. contact stess 2.9 GPa Lubicant VG2 Diving olle Mateial being tested Diven olle Mateial being tested Schematic of test ig Diven olle Diving olle The olling fatigue life of the special mateial at a high tempeatue of 2 C is moe than 3 times as long as that of SUJ2. Special mateial 3 min o longe Fig. 8.2 High tempeatue life test esults with thusttype test pieces SUJ2 2min Duation The anti-seizue popety of the special mateial is moe than 15 times bette than as that with SUJ2. Fig. 8.4 Test esults with a two olle testing machine 49

54 Technical Data Adoption of ceamic balls A compaison of tempeatue incease, which can vay depending on the mateial of olling element, is illustated in Fig Test conditions Test beaing Peload Lubication Oute casing cooling Basic beaing numbe HSE ows) 2.5 kn (constant pessue peloading) Gease None 3 Envionmentally conscious technology The eco-fiendly ULTAGE Seies is available in two specifications: an eco-fiendly ai-oil lubication design that offes enegy savings by educing ai and oil consumptions; and a gease-lubicated, sealed design that educes envionmental impact by employing a gease lubication system that is capable of highespeed opeation. Tempeatue incease of oute ing C Shaft speedmin dmn value1 6 Steel balls Ceamic balls Requied functions fo the main spindle beaing Speed Rigidity Duability Pecision Fo main spindles Eco-fiendly ai-oil lubication Eco-fiendly design The ULTAGE seies beaings employ well-poven ceamic balls to efficiently limit tempeatue incease. HSL type N1HSL type Fig. 8.5 Compaison of tempeatue incease with steel and ceamic olling elements Reduced ai/oil consumption contibutes to enegy savings. High-speed BNS LLB type Gease lubication Standad 7/79AD, CD LLB type N1HSRT6 type Sealed Sealed The intoduction of a gease lubication system that is capable of high-speed opeation educes the envionmental impact. Fo ball scew suppot Gease lubication 2A-BST LXL type 2A-BST type Sealed Combines duability with ease of handling. Duability 5

55 Technical Data Gease-lubicated sealed angula contact ball beaings (1) Ease of handling ULTAGE angula contact ball beaings with seals ae gease-pefilled beaings. No gease filling is necessay; you need only wipe off the ust-peventive oil befoe assembly. Seals of diffeent colos ae employed to diffeentiate the font and back. The black font face and oange back face ae easily identified, which also makes it easy to oient the beaings in combinations (Table 8.1). Table 8.1 Beaing combinations and seal colos DB set (back-to-back) DF set (face-to-face) Oange seal Oange seal Black seal Black seal (2) Suggestions fo simplified spindle stuctue The ULTAGE Seies sealed angula contact ball beaing makes possible high-speed opeation with gease lubication thanks to optimized intenal design. Gease lubication with minimal mist splash simplifies main spindle stuctue and contibutes to lowe envionmental impact as well as cost eduction (Fig. 8.6). Ai-oil lubication Gease lubication Simplifies the main spindle stuctue and educes both the initial cost and opeating cost. Fig. 8.6 Alteation to lubication system (ai-oil lubication to gease lubication) 51

56 Technical Data Eco-fiendly ai-oil lubicated angula contact ball beaings and cylindical olle beaings When combined with the eco-fiendly nozzle, the ecofiendly ai-oil lubicated angula contact ball beaing (HSL/HSFL Seies) o cylindical olle beaing (N1HSL[K] Seies) can educe the emissions of oil mist and noise. (1) Reduction of oil mist The eco-fiendly ai-oil lubicated beaing does not spay compessed ai fom the nozzle; instead, it uses the centifugal foce of the otating inne ing to supply lubicating oil into the beaing. Fo this eason, this type of beaing conseves both ai and oil. In addition, it educes the amount of oil mist emitted fom the labyinth seal of the spindle. The following photogaphs eveal the diffeence between the amount of oil mist emitted fom the conventional standad beaing and that emitted fom the eco-fiendly beaing. The lubicating oil dischaged with ai passes though the inside of the beaing and is then exhausted as a lage volume of mist. The lubicating oil exhausted fom the beaing in the mist state is collected though the dischage pot of the main spindle housing, but some of the oil mist leaks fom the main spindle labyinth seal and contaminates the immediate envionment aound the machine. Adoption of the eco-fiendly beaing theefoe impoves the woking envionment. Standad beaing Eco-fiendly beaing design Standad nozzle Ai-oil Ai-oil Eco-fiendly nozzle Lubicating oil supplied with a lage quantity of ai 2LA-HSE type A small amount of lubicanting oil is supplied 2LA-HSL Type Lubicating oil supplied though centifugal foce Conventional beaings consume a geat deal of ai when supplying lubicating oil to the beaing. The eco-fiendly type uses centifugal foce to supply lubicating oil into the beaing. Standad beaing Eco-fiendly beaing design Inne ing Atomized when emitted fom the nozzle The oil emitted fom the nozzle is in a liquid state. Standad beaing Eco-fiendly beaing design A lage amount of oil mist passes though the beaing, contaminating the woking envionment. The amount of oil mist is educed, minimizing envionmental contamination in wok aeas. 52

57 Technical Data (2) Noise Reduction The standad ai-oil lubication method uses ai to supply a slight amount of oil. It also uses a special nozzle space, as shown in Figs. 8.7 and 8.9. In addition, this method uses a nozzle measuing 1 to 1.5 mm in diamete to supply oil to the aceway suface of the beaing at the ate of 3 to 4 NL/min/beaing. To supply this oil, the nozzle emits compessed ai as a jet to beak the ai baie of the beaing, which is ceated when unning at high speed. In this way, the ai is used as a tool fo supplying oil. The eco-fiendly beaing developed by NTN educes the amount of ai consumed, thus educing the whistling noise of the flowing ai. The mechanism used in this type of beaing is as follows: the centifugal foce of the beaing inne ing feeds a small amount of oil fom the nozzle to the aceway suface of the beaing along the tapeed suface. (Figs. 8.8 and 8.1). Ai-oil Fig. 8.7 Standad nozzle Ai-oil Eco-fiendly nozzle Intenal specification of HSE type Eco-fiendly specification Since the function of the compessed ai is only to delive lubicating oil to the cavity of the inne ing, a lage quantity of ai is not equied. In addition, since the ai used to supply the oil is eleased between the tapeed sufaces, the whistling noise of ai is also educed. When the eco-fiendly beaing is employed, the noise is educed by 6 to 8 dba. Example: In the high-speed egion in excess of 1, min -1, noise is educed by 6 to 8 dba (Fig. 8.11). Test conditions Test beaing Shaft speed Peload Noise valuedba HSFL type HSF type 5S-2LA-HSFL2 (eco-fiendly beaing) 5S-2LA-HSF2 ( ows) 2, min kn (constant pessue peloading) Shaft speedmin dmn value1 6 Fig Compaison of noise values Fig. 8.8 Eco-fiendly type nozzle Ai-oil Fig. 8.9 Cuent beaing N1HS type The eco-fiendly beaing is paticulaly good fo educing sceeching noise. The high-fequency component of the noise geneated at high speeds is well attenuated. The eason fo this is as follows: when the ai jet emitted fom the standad nozzle hits the olling elements, a high-pitched noise is geneated; in contast, the eco-fiendly nozzle does not emit ai on the olling elements, which educes sceeching noise. Ai-oil Eco-fiendly nozzle Intenal specification of N1HSR type Eco-fiendly specification 14 MAG dbv 2 db/ Hz Beaing5S-HSC2 Numbe of balls37 Shaft speed14, min -1 PWR SP A han LIN 1kH Fig. 8.1 ULTAGE N1HSL type Fig Fequency chaacteistics of beaing noise (standad nozzle) 53

58 54 NTN Main Spindle Beaings

59 NTN Main Spindle Beaings Main Spindle Beaings 9. Angula Contact Ball Beaings fo Radial Loads CONTENTS 9. Angula Contact Ball Beaings fo Radial Loads q Featues of vaious types 56 w Standad cage design 58 e Beaing designations 58 Beaing accuacy 6 t Intenal cleaance and standad peload of duplex angula contact ball beaings 62 y Recommended fit fo angula contact ball beaings 68 u Duplex angula contact ball beaings 68 i Duplex aangement codes of duplex angula contact ball beaings 69 o Flush ginding and univesal matching 69! Angula contact ball beaings with ceamic balls 7!1 Opeating life of beaings with ceamic balls 71!2 Recommended lubication specifications 72!3 Standad angula contact ball beaings 79U and 7U types 73!4 High-speed angula contact ball beaings HSE type 74!5 Supe high-speed angula contact ball beaings HSF type 75!6 Eco-fiendly ai-oil lubicated angula contact ball beaings HSL type HSFL type 76!7 Ai-oil lubicated high-speed angula ball beaings with e-lubicating hole on the oute ing - HSEW Type 78!8 Gease-lubicated sealed standad angula contact ball beaings 79LLB/7LLB types, 5S-79LLB/7LLB types 8!9 Gease-lubicated sealed angula contact ball beaings BNS type 5S-BNS type Dimension table Standad angula contact ball beaing 84 High-speed angula contact ball beaings 112 Supe high-speed angula contact ball beaings 136 Eco-fiendly high-speed angula contact ball beaings 138 Eco-fiendly supe high-speed angula contact ball beaings 146 Ai-oil lubicated high-speed angula ball beaings with e-lubicating hole on the oute ing-hsew Type 148 Gease-lubicated sealed standad angula contact ball beaings 156 Gease-lubicated sealed high-speed angula contact ball beaings 172 Angula contact ball beaings fo motos and lathes

60 NTN Main Spindle Beaings 9. Angula Contact Ball Beaings fo Radial Loads Angula contact ball beaings fo adial loads used in machine tools ae beaings which inne and oute ings cannot be sepaated. This type of beaing includes seies 78, 79U, 7U, 72, HSE9, HSE, BNS9, BNS, BNT9, BNT and BNT2. Fo angula contact ball beaings, an imaginay staight line connecting the contact points between the balls and inne and oute ings foms an angle with the adial axis. The optimal contact angle can be selected to meet functional equiements such as high speed o high igidity. The available contact angles ae 15 (contact angle symbol "C"), 2 (no symbol), 25 ("AD"), and 3 (no symbol). (Fig. 9.1) Contact angle Fig. 9.1 Contact angle 1 Featues of vaious types Open beaings Standad angula contact ball beaings (78, 79, 7 and 72 Types) Standad angula contact ball beaings ae available in fou types: 78, 79, 7 and 72. Types 79 and 7 include the 79U and 7U ULTAGE Seies, which accommodate high speed and low tempeatue ise with optimized specifications of the intenal design. Fo these types, thee contact angles ae available: 15 (contact angle symbol "C"), 25 ("AD"), and 3 (no symbol). The contact angle of 25, howeve, is also available with 79U and 7U types. This beaing seies has an accuacy of JIS class 5 o bette. The featues include high speed, high igidity, and high load capacity. Some models incopoate ceamic balls. 72C 7UC 79UC 78C Fig Standad angula contact ball beaings suface of the inne ing and the boe of the oute ing ae elieved on one side, and this beaing seies employs an ai-oil lubication system to ensue smooth oil flow. In addition, it employs special mateials, and its suface is modified to potect the beaing fom wea and seizue moe positively. The HSE type beaing is available with eithe steel balls o ceamic balls. Ulta-high-speed angula ceamic ball beaings (HSF type) The HSF type ulta-high-speed angula contact ceamic ball beaing employs smalle balls than the HSEC type to ensue igidity and pevent tempeatue ise. In addition, it employs a contact angle of 25 to accommodate the eduction in contact angle caused by centifugal foce duing opeation. These featues allow the use of an ai-oil lubication system (dmn value < ) in a speed egion that was peviously possible only with a conventional jet lubication system. High-speed angula contact ball beaings (HSE type) High-speed angula contact beaings ae available in two types: HSE9 and HSE. The bounday dimensions of this beaing seies ae detemined accoding to the JIS dimension seies (9, ), and thee types of contact angles ae available: 15 (contact angle symbol "C"), 2 (no symbol), and 25 ("D"). The accuacy of this ball beaing seies is JIS class 5 o bette, and the ball diamete is smalle than that of the standad angula contact ball beaing in ode to accommodate high speeds. The oute HSEC HSE9C Fig. 9.3 High-speed angula contact ball beaings Fig. 9.4 Ulta-high-speed angula contact ball beaings Eco-fiendly ai-oil lubicated angula ball beaings (HSL and HSFL types) Fo eco-fiendly ai-oil lubicated angula contact ball beaings (HSL and HSFL types), the angle of the inne ing oute suface (counteboe aea) is optimized compaed with that of HSE and HSF types. In addition, these angula contact ball beaings ae dedicated to aioil lubication by adopting a cicumfeential goove and an eco-fiendly nozzle. They accommodate the same high speed as HSE and HSF types while being moe eco-fiendly. They geneate less noise and conseve enegy since they consume less ai and oil. The 56

61 NTN Main Spindle Beaings accuacies of these beaing types ae JIS class 5 o bette. Fo the HSL type, thee contact angles [2 (no symbol), and 25 ("AD")] ae available. Fo the HSFL type, howeve, only one contact angle (25 ) is available. The HSFL type utilizes a specially designed eco-fiendly nozzle. HSL type HSFL type Fig. 9.5 Eco-fiendly angula contact ball beaings Ai-oil lubicated high-speed angula ball beaings with e-lubicating hole on the oute ing (HSEW type) HSEW type is designed based on HSE type as high speed angula contact ball beaing fo ai-oil lubication with lubication hole on oute ing. Spaces next to these beaings don't need length fo nozzle to be mounted, and can be shot. These shot spaces have an effect on compact design and igidity of spindle as a esult of shotened distance between beaing and tool. In addition, diect ai-oil supply though the hole on oute ing achieves impoved lubicating eliability with low ai flow ate and small oil consumption. JIS Class 5 o highe beaing accuacy is applied on this type. Two kind of contact angles ae available, 2 (no suffix) and 25 (AD). Fig. 9.6 Ulta-high-speed angula contact ball beaings High-speed angula contact ball beaings fo ginding machines/motos (BNT type) The bounday dimensions of high-speed angula ball beaings fo ginding machines/motos (BNT type) ae detemined accoding to the JIS dimension seies (9,, 2). Fo this beaing type, only one contact angle (15, no symbol) is available, and the beaing accuacies ae JIS class 5 o bette. This beaing uses mainly ai-oil lubication and oil mist lubication. The featues of this beaing ae high speed capability and high load capacity. This type of beaing is available with eithe steel balls o ceamic balls. Sealed beaings Standad gease-lubicated sealed angula contact ball beaings (79LLB/7LLB types) The standad gease-lubicated sealed angula contact ball beaings ae available in 79 and 7 seies. Non-contact ubbe seals ae mounted on both sides and special gease is used. As a esult, these beaings accommodate high speed, offe polonged sevice life, and help to maintain a comfotable woking envionment. These beaings ae available in contact angles of 15 (contact angle symbol "CD") and 25 ("AD") and with a special accuacy of P42 (JIS class 4 dimensional accuacy and JIS class 2 unning accuacy). Since they ae pefilled with gease, these beaings equie no cleaning befoe use and ae theefoe easy to handle. They ae available with eithe steel balls o ceamic balls. Back side Fig. 9.8 Standad gease-lubicated sealed angula contact ball beaings High-speed gease-lubicated sealed angula contact ball beaings (BNS type) High-speed gease-lubicated sealed angula contact ball beaings (BNS type) ae available with the bounday dimensions of HSE type. Non-contact ubbe seals ae incopoated on both sides and its inne stuctue is optimized. It is also pefilled with a special gease to achieve high speed capability, inhibit tempeatue ise, extend sevice life and ceate a comfotable woking envionment. This beaing type is available in contact angles of 15 (contact angle symbol "CD"), 2 (no symbol), and 25 ("AD"). Beaing accuacy is JIS class 4 o bette. The beaing ing is made of a special mateial, and the suface is modified to potect the beaing fom wea and seizue. Since this type is pefilled with gease, it equies no cleaning befoe use and is theefoe easy to handle. It is available with eithe steel balls o ceamic balls. Font side Back side Font side BNT2 BNT BNT9 Fig. 9.7 High-speed angula contact ball beaings fo ginding machines/motos Fig. 9.9 High-speed gease-lubicated sealed angula contact ball beaings 57

62 NTN Main Spindle Beaings 2 Standad cage design Table 9.1 Standad cages of angula contact ball beaings fo adial loads Beaing seies Molded nylon cage Machined phenol esin cage Machined high tensile bass cage 78C 79U (15, 25, 3 ), 79C 7U (15, 25, 3 ), 7C 72C HSE9U (15, 2, 25 ) HSE (15, 2, 25 ) HSF HSL9U (2, 25 ) HSL (2, 25 ) HSFL HSEW9U (2, 25 ) HSEW (2, 25 ) 79 LLB (15, 25 ) 7 LLB (15, 25 ) BNS9 LLB (15, 2, 25 ) BNS LLB (15, 2, 25 ) BNT9 BNT BNT2 79U 7926U 7U 726U 72C 722C 79 LLB 791 LLB 7 LLB 71 LLB 785C 7824C 7221C 7228C HSE91U HSE934U HSE1 HSE34 HSF1 HSF2 HSL91U HSL926U HSL1 HSL26 HSFL1 HSFL2 HSEW91U HSEW92U HSEW1 HSEW2 BNS91 LLB BNS92 LLB BNS1 LLB BNS2 LLB BNT9 BNT913 BNT BNT14 BNT2 BNT C 7834C 7928C 7934C 728C 74C Note 1) Cage design is subject to change without notice. Fo detailed infomation, contact NTN Engineeing. Note 2) The polyamide plastic cage can be used up to the following otating speeds depending on the mateial of the olling element. The dmn is 9, fo beaing steel and dmn is 1,, fo ceamics. Machined phenol esin cages must be used if the allowable otational speed of the dimensions listed exceeds the figues above. Fo detailed infomation, contact NTN Engineeing. 3 Beaing designations 78, 79, 7, 72, BNT type 5S- 7 2 U C T1 DB /GL P4 Pecision class P5: JIS class 5, P4: JIS class 4, P2: JIS class 2 Intenal cleaance code GL: Light peload, GN: Nomal peload, GM: cental peload, Gxx: Special peload, CSxx: Special cleaance Matching code DB: Back-to-back (double-ow) DT: Tandem (double-ow) DTBT: Tandem back-to-back (quad-ow) Cage code No code: Standad cage T1: Machined phenol esin cage T2: Molded polyamide esin cage L1: Machined high tensile bass cage Contact angle code C: 15, AD: 25, No symbol: 2 Beaing seies (ULTAGE Seies) Boe diamete code (See dimension table) Dimension seies code Beaing type Mateial code 5S: Ceamic olling elements No code: Steel olling elements 58

63 NTN Main Spindle Beaings HSE type 5S- 2LA-HSE 2 AD T2 DB /GL P4 Contact angle code C: 15, AD: 25, No symbol: 2 Boe diamete code (See dimension table) Dimension seies code Beaing type 2LASpecial mateial with impoved suface teatment HSL type 5S- 2LA-HSL 2 DB +xx Dn /GL P4 +TKZ Spacecode Locatedbesidebeaings Spacecode Locatedbetweenbeaings Spacewidthdimension noteshslbeaing seies code xxdneco-fiendly nozzle, o Space with Eco- fiendly nozzle located between beaings TKZEco-fiendly nozzle, o Space with Eco- fiendly nozzle located beside beaings Beaing type HSEW type 5S- 2LA-HSEW 2 DB/GL P4 Beaing type 79LLB / 7LLB type 5S- 76 CD LLB DB /GL P42 /L749 Accuacy class P42: Dimensional accuacy = JIS class 4, unning accuacy = JIS class 2 Beaing type (ULTAGE Seies) CD : Contact angle 15 AD : Contact angle 25 BNS type 5S- 2LA-BNS 2 LLB DB /GL P4 /L749 Gease code /L448 : Special gease MP-1 /L749 : Special gease SE-1 Seal code LLB: Non-contact ubbe seal on both sides Beaing type 59

64 NTN Main Spindle Beaings 4 Beaing accuacy Table 9.2 Inne ings Nominal boe diamete d Single plane mean boe diamete deviation dmp Class 5 Class 4 1 Class 2 1 ove incl. high low high low high low Single adial plane boe diamete vaiation Vdsp Diamete seies 9 Diamete seies, 2 Class 5 Class 4 Class 2 Class 5 Class 4 Class 2 max max Mean boe diamete deviation Vdmp Class 5 Class 4 Class 2 max Inne ing adial unout Kia Class 5 Class 4 Class 2 max 1 The toleance of boe diamete deviation ds, applicable to classes 4 and 2, is the same as the toleance of mean boe diamete deviation dmp. This applies to the diamete seies o 2 fo class 4, and all the diamete seies fo class 2. 2 Applicable to individual beaing ings manufactued fo duplex beaings Table 9.3 Oute ings Nominal outside diamete D Single plane mean outside diamete deviation Dmp Class 5 Class 4 3 Class 2 3 ove incl. high low high low high low Single adial plane outside diamete vaiation VDsp Diamete seies 9 Diamete seies, 2 Class 5 Class 4 Class 2 Class 5 Class 4 Class 2 max max Mean single plane outside diamete vaiation VDmp Class 5 Class 4 Class 2 max Oute ing adial unout Kea Class 5 Class 4 Class 2 max The toleance of outside diamete deviation Ds, applicable to classes 4 and 2, is the same as the toleance of mean outside diamete deviation Dmp. This applies to the diamete seies o 2 fo class 4, and all the diamete seies fo class 2. 6

65 NTN Main Spindle Beaings Pependiculaity of inne ing face with espect to the boe Sd Class 5 Class 4 Class 2 max Axial unout Sia Width deviation Bs Duplex Single beaing beaing 2 Class 5 Class 4 Class 2 Class 5 Class 4 Class 2 Class 5 Class 4 max high low high low high low Unit: Width vaiation VBs Class 5 Class 4 Class 2 max Pependiculaity of oute ing outside suface with espect to the face SD Class 5 Class 4 Class 2 max Axial unout Sea Class 5 Class 4 Class 2 max Width deviation Cs All types Unit: Width vaiation VCs Class 5 Class 4 Class 2 max Identical to of Bs elative to d of the same beaing

66 NTN Main Spindle Beaings 5 Intenal cleaance and standad peload of duplex angula contact ball beaings The initial intenal cleaance o peload fo duplex angula contact ball beaings is detemined with consideation fo two factos: tempeatue ise duing opeation and the igidity and accuacy equied afte assembly o duing opeation. The intenal cleaance of the beaing may be significantly affected duing opeation due to thee factos: the eduction in cleaance caused by fits, the tempeatue diffeence between the inne and oute ings duing opeation, and the effects of centifugal foce. Depending on the initial intenal cleaance, a significantly educed cleaance may esult in exteme tempeatue ise, vibation, noise, and shot sevice life. In addition, seizue may esult in some cases. Fo this eason, it is impotant to detemine the optimal initial intenal cleaance and initial peload equied fo opeation. When using a duplex angula contact ball beaing on the main spindle of a machine tool, the peload is detemined by consideing the type, main spindle configuation, lubication system, dive system, intended functions, and othe factos. Howeve, peload can also be genealized by the dmn value (dmn: pitch cicle diamete acoss olling elements [mm] multiplied by speed [min -1 ]), as shown below: dmn Nomal peload (GN) <dmn Light peload (GL) dmn> to positive cleaance Fo detailed infomation, contact NTN Engineeing. Table 9.4 Radial intenal cleaance of duplex angula contact ball beaings Unit:m Nominal boe diamete d C1 C2 CN (nomal) ove incl. min max min max min max Fo duplex angula contact ball beaings, NTN ecommends the initial adial cleaances and standad peloads shown in Tables 9.4 though Select the optimal adial intenal cleaance and initial peload fo you application. When odeing a duplex angula ball beaing, please specify the desied peload and cleaance. If these ae not specified in the ode, we will ship a beaing with standad cleaance. Howeve, some poduct types do not have a standad cleaance. In this case, we will infom you of the available cleaances. Standad peloads of angula contact ball beaings (DB and DF aangements) Table 9.5 Standad angula contact ball beaings (78C type) Unit: N Nominal boe diamete Contact angle: 15 78xxC d Light peload Nomal peload Medium peload (GL) (GN) (GM)

67 NTN Main Spindle Beaings Table 9.6 Standad angula contact ball beaings (79 seies) Nominal boe Contact angle: 15 Contact angle: 25 diamete 79xxUC/5S-79xxUC 79xxUAD/5S-79xxUAD d Light peload Nomal peload Medium peload Light peload Nomal peload Medium peload (GL) (GN) (GM) (GL) (GN) (GM) Light peload (GL) Contact angle: 3 79xxU/5S-79xxU Nomal peload (GN) Unit: N Medium peload (GM) xxC

68 NTN Main Spindle Beaings Table 9.7 Standad angula contact ball beaings (7 seies) Nominal boe diamete d Light peload (GL) Contact angle: 15 7xxUC/5S-7xxUC Nomal peload (GN) xxC Medium peload (GM) Light peload (GL) Contact angle: 25 7xxUAD/5S-7xxUAD Nomal peload (GN) Medium peload (GM) Light peload (GL) Contact angle: 3 7xxU/5S-7xxU Nomal peload (GN) Unit: N Medium peload (GM) Table 9.8 Standad angula contact ball beaings (72C seies) Unit: N Nominal boe Contact angle: 15 diamete 72xxC d Light peload Nomal peload Medium peload (GL) (GN) (GM)

69 NTN Main Spindle Beaings Table 9.9 High-speed angula contact ball beaings (HSE9 seies) Unit: N Nominal boe Contact angle: 15 Contact angle: 2 Contact angle: 25 diamete HSE9xxUC/5S-HSE9xxUC HSE9xxU/5S-HSE9xxU HSE9xxUAD/5S-HSE9xxUAD d Light peload Nomal peload Medium peload Light peload Nomal peload Medium peload Light peload Nomal peload Medium peload (GL) (GN) (GM) (GL) (GN) (GM) (GL) (GN) (GM) Table 9.1 High-speed angula contact ball beaings (HSE seies) Unit: N Nominal boe Contact angle: 15 Contact angle: 2 Contact angle:25 diamete HSExxC/5S-HSExxC HSExx/5S-HSExx HSExxAD/5S-HSExxAD d Light peload Nomal peload Medium peload Light peload Nomal peload Medium peload Light peload Nomal peload Medium peload (GL) (GN) (GM) (GL) (GN) (GM) (GL) (GN) (GM)

70 NTN Main Spindle Beaings Table 9.11 Eco-fiendly ai-oil lubicated angula contact ball beaings (HSL9 seies) Nominal boe diamete d Light peload (GL) Contact angle: 2 5S-HSL9xxU Nomal peload (GN) Medium peload (GM) Light peload (GL) Unit: N Contact angle: 25 5S-HSL9xxUAD Nomal peload (GN) Medium peload (GM) Table 9.12 Eco-fiendly ai-oil lubicated angula contact ball beaings (HSL seies) Nominal boe diamete d Light peload (GL) Contact angle: 2 5S-HSLxx Nomal peload (GN) Medium peload (GM) Light peload (GL) Unit: N Contact angle: 25 5S-HSLxxAD Nomal peload (GN) Medium peload (GM) Table 9.13 Ai-oil lubicated high-speed angula ball beaings with e-lubicating hole on the oute ing (HSEW9U seies) Unit: N Nominal boe diamete d Light peload (GL) Contact angle: 2 5S-HSEW9xxU Nomal peload (GN) Medium peload (GM) Light peload (GL) Contact angle: 25 5S-HSEW9xxUAD Nomal peload (GN) Medium peload (GM) Table 9.14 Ai-oil lubicated high-speed angula ball beaings with e-lubicating hole on the oute ing (HSEW seies) Unit: N Nominal boe diamete d Light peload (GL) Contact angle: 2 5S-HSEWxx Nomal peload (GN) Medium peload (GM) Light peload (GL) Contact angle: 25 5S-HSEWxxAD Nomal peload (GN) Medium peload (GM) Table 9.15 Gease-lubicated sealed angula contact ball beaings (79CD and AD seies) Unit: N Nominal boe Contact angle: 15 Contact angle: 25 diamete 79xxCD/5S-79xxCD 79xxAD/5S-79xxAD d Light peload Nomal peload Medium peload Light peload Nomal peload Medium peload (GL) (GN) (GM) (GL) (GN) (GM) Table 9.16 Gease-lubicated sealed angula contact ball beaings (7CD and AD seies) Unit: N Nominal boe Contact angle: 15 Contact angle: 25 diamete 7xxCD/5S-7xxCD 7xxAD/5S-7xxAD d Light peload Nomal peload Medium peload Light peload Nomal peload Medium peload (GL) (GN) (GM) (GL) (GN) (GM)

71 NTN Main Spindle Beaings Table 9.17 High-speed gease-lubicated sealed angula contact ball beaings (BNS9 seies) Unit: N Nominal boe Contact angle: 15 Contact angle: 2 Contact angle: 25 diamete d Light peload Nomal peload Medium peload Light peload Nomal peload Medium peload Light peload Nomal peload Medium peload (GL) (GN) (GM) (GL) (GN) (GM) (GL) (GN) (GM) Table 9.18 High-speed gease-lubicated sealed angula contact ball beaings (BNS seies) Unit: N Contact angle: 15 Contact angle: 2 Contact angle: 25 BNSxxC/5S-BNSxxC BNSxx/5S-BNSxx BNSxxAD/5S-BNSxxAD Nominal boe diamete d Light peload (GL) Nomal peload (GN) Medium peload (GM) Light peload (GL) Nomal peload (GN) Medium peload (GM) Light peload (GL) Nomal peload (GN) Medium peload (GM) Table 9.19 High-speed sealed angula contact ball beaings (BNT9 seies) Nominal boe diamete d Light peload (GL) Table 9.2 High-speed sealed angula contact ball beaings (BNT seies) Table 9.21 High-speed sealed angula contact ball beaings (BNT2 seies) Unit: N Unit: N Unit: N Contact angle: 15 BNT9xx/5S-BNT9xx Nominal boe diamete Contact angle: 15 BNTxx/5S-BNTxx Nominal boe diamete Contact angle: 15 BNT2xx/5S-BNT2xx d d Nomal peload (GN) Medium peload (GM) Light peload (GL) Nomal peload (GN) Medium peload (GM) Light peload (GL) Nomal peload (GN) Medium peload (GM)

72 NTN Main Spindle Beaings 6 Recommended fit fo angula contact ball beaings If the dmn value is in the ange of dmn (dm : pitch cicle diamete acoss olling elements [mm], n: speed [min -1 ]), the fit values shown in Tables 9.22 and 9.23 ae ecommended to ensue high accuacies of pecision beaings. If the dmn value is in the ange of dmn>75 1 3, it is necessay to conside expansion of inne ing caused by centifugal foce. In this case, contact NTN Engineeing fo the ecommended fit. As fo the fit of the oute ing with the housing, conside the influence of the ambient tempeatue (such as heat buildup on a built-in moto o the cooling effect of jacket). Fo technical assistance, contact NTN Engineeing. Table 9.22 Shaft fit Nominal boe diamete d Ove Incl Fit of inne ing with shaft 2T 2T 2T 3T 1T4T 1T5T Unit: 7 Duplex angula contact ball beaings Duplex angula contact ball beaings can be combined in ows of two, thee o fou beaings to accommodate equied specifications. The back-to-back duplex (DB) aangement and the face-to-face duplex (DF) aangement allow fo the application of both adial loads and axial loads in both diections. The DB aangement has a wide space between load points and can handle lage moment loads. Fo this eason, this type of duplex aangement is pefeable fo use on the main spindles of machine tools. The DF aangement cannot handle lage moment loads, but its allowable inclination angle is geate than that of the DB aangement. The tandem duplex (DT) aangement can handle both a adial load and lage axial load, but this beaing can take the axial load in one diection only. The 4-ow duplex (type DTBT) aangement ensues high igidity in the adial and axial diections and accommodates high-speed opeation. Fo this eason, this type of duplex beaing is commonly used fo the main spindles of machining centes. Each duplex angula contact ball beaing is manufactued as a set to enable adjustment of the peload and cleaance. Fo this eason, combine only duplex beaings of the same poduct numbe T7T 2T8T Notes: 1. The mean value should be the taget value. 2. If the dmn value of the high-speed machine is in the ange of dmn751 3, it is necessay to incease the amount of intefeence. In this case, contact NTN Engineeing fo technical assistance. T: Tight (Intefeence) Fit DB duplex aangement DF duplex aangement DT duplex aangement Table 9.23 Housing fit Unit: Nominal outside diamete D Fit of oute ing with housing Ove Incl. Beaing on fixed side Beaing on fee side L5L 3L7L 4L9L 6L1L 6L12L 8L13L DBT duplex aangement Fig. 9.1 DTBT duplex aangement L11L 6L13L 7L15L 1L16L 11L17L 13L2L L17L 15L23L Notes: 1. The mean value should be the taget value. 2. If the dmn value is in the ange of dmn11 4, space width and beaing aangement, it is necessay to incease the amount of intefeence. In this case, contact NTN Engineeing fo technical assistance. L: Loose fit 68

73 NTN Main Spindle Beaings 8 Duplex aangement codes fo angula contact ball beaings Each duplex ball beaing has a poduct numbe and duplex aangement code etched on its side face. On angula contact ball beaing sets of thee o moe, each matching beaing has a "<" mak on its outside suface. ~~~ Be sue to align the "<" mak when assembling the ~~~ beaings. Note that duplex angula contact ball beaing types DB and DF do not have the "<" mak. To match them, ~~~ align the duplex aangement codes. Poduct numbe/duplex aangement code A Poduct numbe/duplex aangement code AB Poduct numbe Fig Poduct numbe Poduct numbe Poduct numbe Poduct numbe/duplex aangement code BC Poduct numbe 9 Flush ginding and univesal matching Angula contact ball beaings ae often combined fo a special pupose. Face-to-face duplex (DF) aangement, back-to-back duplex (DB) aangement and tandem duplex (DT) aangement may be combined in ows of two o moe. When combining many beaings, it is impotant to contol the accuacies of the beaings and to align thei face heights in a common plane. Flush ginding Flush ginding is a finishing technique in which the font and back faces of the inne and oute ings ae aligned with each othe to eliminate diffeences in face height (Fig. 9.13). Such alignment can ensue the specified cleaance and Back Face height diffeence A Face height diffeence B Font A=B Fig Flush ginding peload fo DF, DB, and DT sets, but it is possible only if the combined beaings have the same cleaance/peload symbols. The flush ginding technique is employed fo standad BNT seies, seies, and 2 seies beaings designed fo main spindles of machine tools, and fo 2A-BST thust angula contact ball beaings designed to suppot ballscews. Note: The flush ginding technique is also adopted fo othe types of angula contact ball beaings. When odeing a beaing, append G to the poduct numbe to specify the flush gound type. Example: 71UC G/GNP4 Contol of beaing-to- beaing diffeence Contol of beaing-to- beaing diffeence Fig Combinations can be changed. Adjustment of the cleaance is not necessay. Contol of beaing-to- beaing diffeence Contol of beaing-to- beaing diffeence Combinations can be changed. Adjustment of the cleaance is not necessay. Fig Univesal matching Univesal Matching In addition to the flush ginding technique, univesal matching is employed fo duplex angula contact ball beaings. Univesal matching contols the beaing-tobeaing dimensional diffeences in the boe and outside diametes. NTN can contol the beaing-to-beaing diffeence in the boe and outside diametes to no moe than onethid the toleance (a minimum of 2 μm). Univesal matching is adopted fo duplex angula contact ball beaings of JIS class 5 o bette. When odeing a beaing, specify the desied numbe of duplex beaings to be used in combination ( D2 fo DB, DF o DT; and D3 fo DBT, DFT o DTT). Contol of beaing-to- beaing diffeence Contol of beaing-to- beaing diffeence DB aangement DF aangement DT aangement Altenately, indicate the basic combination and specify univesal matching. If two duplex beaings ae combined, D2 is appended to the poduct numbe. Example: 71UC G D2/GNP4 69

74 NTN Main Spindle Beaings! Angula contact ball beaings with ceamic balls Recently, the main spindles of machining centes, NC machines and othe machine tools have been equied to opeate at much highe speeds. Beaings fo main spindles theefoe must meet the equiements of high speed and igidity as well as accuacy. To meet such equiements, many of ou customes want the olling element made of ceamic mateial. The featues of angula contact ball beaings with ceamic balls ae descibed below. Limited tempeatue ise and ulta-high speeds The specific gavity of ceamic mateial is one-half that of beaing steel. In addition, the ball diamete of 5S-HSE type is smalle than that of the standad 7 type. Fo this eason, use of ceamic balls geatly educes the influence of centifugal foce (ball sliding and spinning caused by gyatoy moment). As a esult, these angula contact ball beaings inhibit tempeatue buildup and ensue ulta-high speed. High beaing igidity fo high accuacy of manufactued poducts The Young s modulus of ceamic mateial is appoximately 1.5 times that of beaing steel. The igidity of these angula contact ball beaings is theefoe geatly inceased. Fig Test ig fo measuing tempeatue ise Beaing tempeatue ise C Beaing tested2la-hseo16c Shaft speed 412 min -1 Lubication Ai-oil lubication Aiflow ate 3 NL/min Oil supply ate.36 ml/h Steel ball Ceamic ball Table 9.24 Compaison of physical popeties between ceamic and steel balls Density (g/cm 3 ) Item Young s modulus (GPa) Poisson s atio Themal expansion (1-6 / C) Themal conductivity atio (Cal/cms C) Ceamic (Si3N4) Beaing steel (SUJ2) Speed min -1 Fig Compaison of tempeatue ise between beaings with ceamic balls and those with steel balls 7

75 NTN Main Spindle Beaings!1 Opeating life of beaings with ceamic balls Test conditions Beaing tested:626 Beaing load :686 N{7 kgf} Shaft speed :2 min -1 Lubication :Class 1 tubine oil (VG56), ciculating lubication Test machine Coupling Pulley Loading sping Suppot beaing 6312 Test beaing Accumulative pobability of failue % Hatched aea: With steel balls : With ceamic balls Opeating lifeln Fig Radial load-type beaing life test machine Fig Opeating life of ball beaing with ceamic balls Beaing fiction toquenmm Steel ball Ceamic ball 5, 1, 15, 2, Speedmin -1 Displacement in axial diection Steel ball Ceamic ball Axial loadn Fig Fictional toque Fig. 9.2 Displacement in axial diection 71

76 NTN Main Spindle Beaings!2 Recommended lubication Angula contact ball beaings ae usually used with gease lubication o ai-oil lubication. Recommended lubication specifications ae descibed below. Gease lubication Recommended band of gease Refe to 7. Lubication of Beaings, 7-1 Gease lubication in the Technical Data section. Recommended gease fill dmn value % of the capacity shown in the dimension tables dmn> % of the capacity shown in the dimension tables Recommended gease filling method Refe to 6. Handling of Beaings, 6-1 Cleaning of beaings and filling with gease in the Technical Data section. Notes Gease-lubicated sealed angula contact ball beaings (79 LLB/7 LLB type, and BNS type beaings) ae pefilled with long-life SE-1 gease. Wipe ust peventive oil fom the outside of the beaing with a clean cloth. Ai-oil lubication Recommended location of nozzle Refe to 7. Lubication of Beaings, 7-2 Ai-oil lubication in the Technical Data section. Recommended specifications of nozzle Nozzle boe dia.: 1 to 1.5 mm Numbe of nozzles: One nozzle pe beaing, depth of nozzle boe should be fou to six times as lage as the boe diamete. Recommended specifications of ai-oil Oil type: Spindle oil Viscosity gade: ISO VG fom 1 to 32 (32 is pefeable) Table Ai and oil amount Beaing type 78C,79U,7U, 72C HSE9, HSE HSF HSL HSFL HSEW dmn value (1 6 ) Ove Incl Oil valume pe shot ml.3 Lubication intevals Oil consumption ml/h NR/min (Nomal lite/minute)... NRmeans the volume of ai at C and 1 atmosphee. min Recommended ai consumption NL/min 72

77 NTN Main Spindle Beaings!3 Standad angula contact ball beaings 79U and 7U types ULTAGE 79U and 7U seies beaings wee developed fom standad angula contact ball beaings (79 and 7). Optimized intenal design and adoption of a new esin cage allows high-speed opeation and ensues high igidity. Featues 1. Optimized intenal design enables high-speed opeation and high igidity. 2. A new esin cage enables impovement in gease etention fo gease lubication and enhanced pefomance in feeding and dischage of oil fo ai-oil lubication. 3. Beaings ae available with eithe steel o ceamic balls. 4. Thee contact angles (15, 2, and 3 ) ae available to handle a wide ange of applications. Beaing specifications Ai-oil Fig U and 7U types Photo 9.1 New esin cage High-speed opeation Optimized intenal design and adoption of a new esin cage enable stable opeation at dmn value , with gease lubication. Test conditions Test Beaing Shaft speed Peload afte assembled Gease lubication Tempeatue incease on oute ing C Tempeatue incease on oute ing C UCDB (5816) 15 min -1 2 N (Fixed position peloading) NBU15 dmn value 1 6 Fig High-speed test with gease lubication Stable opeation is possible with dmn value , with ai-oil lubication. Test conditions Tested Beaing Speed Peload afte assembled Ai-oil lubication w/ jacket cooling w/o jacket cooling w/ jacket cooling w/o jacket cooling Speedmin -1 71UCDB (5816) 23 min -1 2 N (Fixed position peloading).3 ml/shot (oil injection intevals: 5 min, ai consumption: 4 NL/min) Speedmin dmn value 1 6 Fig High-speed test with ai-oil lubication Pemissible speed ange dmn value 1 6 7U 79U Gease lubication Ai-oil lubication 5S-7U S-79U Notes) Pemissible speed of each beaing (dmn value) vaies depending on the specifications of the machine on which the beaing is used (moto dive system, cooling system, and constuction aound the beaing). Conside the optimal choice efeing to the above guideline (fo two-ow aangement), and then, contact NTN Engineeing fo technical assistance. 73

78 NTN Main Spindle Beaings!4 High-speed angula contact ball beaings HSE type The HSE type employs a special mateial featuing geatly impoved wea esistance and anti-seizue popeties as well as a special suface modification technique. Futhemoe, thanks to an optimized intenal design, this type achieves high speed, high igidity and high eliability. Featues 1. Adoption of special mateials and a unique intenal design impove anti-seizue popeties (15 times bette than the conventional type) and wea esistance (6 times bette than of the conventional type). 2. Optimized intenal design enables high-speed opeation and high igidity. 3. Beaings ae available with eithe steel o ceamic balls. 4. Thee contact angles (15, 2, and 25 ) ae available to handle a wide ange of applications. Beaing specification Ai oil Fig HSE type Peload and low tempeatue ise The 5S-HSE type featues high speed and limited tempeatue incease. Even if its peload is inceased afte assembly into the spindle, it maintains stable pefomance at high speeds (Fig. 9.25). Test condition Test beaing Shaft speed Lubication Oil consumption Ai consumption Oute casing cooling Tempeatue incease of oute ing C S-2LA-HSE2 (contact angle 2 ) ( ows) 15 min -1 Ai-oil lubication.3 ml/shot (Oil shot intevals 5 min) 4NL/min Povided dmn value 1 6 Fig Relationship between peload and tempeatue incease Impoved main spindle igidity When built into a high-speed main spindle, the peload of the 5S-HSE standad type is maintained, allowing high igidity (1.9 times geate than a conventional beaing) (Fig. 9.26). Test condition Axial displacement m Test beaing Post-assembly peload S-HSE type Post-assembly peload N Post-assembly peload 5 N Post-assembly peload 1 N Shaft speedmin -1 HSB (contact angle 15 ) HSB (contact angle 2 ) HSE (contact angle 2 ) 5S-HSB2 (contact angles 15 and 2 ) 5S-2LA-HSE2 (contact angle 2 ) ( ows) 5S-HSB2 5S-HSE2 N 5 N Pemissible speed ange dmn value 1 6 2LA-HSE 2LA-HSE , , Axial loadkn Fig Compaison of igidity elative to conventional beaing (HSB type) in tems of post-assembly peload , 2 15, 2 Gease lubication Ai-oil lubication 5S-2LA-HSE 25 15, , S-2LA-HSE , , 2 Notes) Pemissible speed of each beaing (dmn value) vaies depending on the specifications of the machine on which the beaing is used (moto dive system, cooling system, and constuction aound the beaing). Conside the optimal choice efeing to the above guideline (fo two-ow aangement) and then contact NTN Engineeing fo technical assistance.

79 NTN Main Spindle Beaings!5 Supe high-speed angula contact ball beaings HSF type The HSF type ealizes futhe impovement in highspeed unning and inhibited tempeatue ise by adoption of smalle diamete ceamic balls, while etaining featues of the HSE type. This type attains dmn values as high as 2.6 million with fixed pessue peloading. Featues 1. Adoption of special mateials and a unique intenal design impove anti-seizue popety (15 times bette than the conventional type) and wea esistance (6 time bette than the conventional type). 2. Optimized intenal design enables high-speed opeation and high igidity. 3. Ceamic balls ae used. 4. Initial contact angle is set to 25 to accommodate the change in contact angle duing supe high-speed opeation. Beaing specification Ai oil Low tempeatue ise Supe high-speed 5S-HSF seies angula contact ball beaings utilize smalle balls than those of the highspeed HSE seies. This educes heating due to centifugal foce and ensues lowe tempeatue ise. Thus, the 5S-HSF type boasts an appoximately 1% eduction in tempeatue ise as compaed to the 5S- HSE type. (Fig. 9.28) Test condition Tempeatue ise of oute ing C Test beaing Shaft speed Lubication Oil consumption Ai consumption Oute casing cooling S-HSE (peload 5 N) 5S-HSF type (peload 25 N) 5S-2LA-HSE2 (contact angle 2 ) 5S-2LA-HSF2 (contact angle 25 ) ( ows) 14 min -1 Ai-oil lubication.3 ml/shot (Oil shot intevals 5 min) 4NL/min None Shaft speedmin dmn value 1 6 Fig Compaison of tempeatue ise Fig HSF type Pemissible speed ange dmn value S-2LA-HSF Fixed-pessue peloading Notes) Pemissible speed of each beaing (dmn value) vaies depending on the specifications of the machine on which the beaing is used (moto dive system, cooling system, and constuction aound the beaing). Conside the optimal choice efeing to the above guideline (fo two-ow aangement) and contact NTN Engineeing fo technical assistance. 75

80 NTN Main Spindle Beaings!6 Eco-fiendly ai-oil lubicated angula contact ball beaings HSL type HSFL type The HSL/HSFL type is an advanced vaiation of the HSE/HSF type, chaacteized by incopoation of NTN s unique eco-conscious lubication technology. The HSL type helps decease oil mist emissions and consumption of ai and oil, impoving the woking envionment fo machine tool opeatos and educing enegy consumption. Featues 1. Adoption of special mateials and a unique intenal design impove anti-seizue popeties (15 times bette compaed with the conventional type) and wea esistance (6 times bette than the conventional type). 2. Beaings ae available with eithe steel o ceamic balls (HSFL is available with ceamic balls only). 3. Adoption of eco-fiendly nozzle educes noise (eduction of 2 to 8 dba), ai consumption (eduction of 5 to 75%) and oil consumption (eduction of 2 to 9%) Beaing specification Ai-oil Ai-oil Eco-fiendly nozzle HSE(HSF) type HSL/HSFL type (ULTAGE) Fig HSL and HSFL types Intenal specification of HSE type Eco-fliendly specification NOTE) The HSL/HSFL type is packed togethe with the space with the eco-fliendly nozzle. The beaing type code HSL epesents the beaing pope, while a space code stands fo an eco-conscious nozzle pope o a space having a built-in nozzle. Fo moe details, see 3. Beaing Designation. Pemissible speed ange dmn value S-2LA-HSL S-2LA-HSL S-2LA-HSFL Fixed-pessue peloading Notes) Pemissible speed of each beaing (dmn value) vaies depending on the specifications of the machine on which the beaing is used (moto dive system, cooling system, and constuction aound the beaing). Conside the optimal choice efeing to the above guideline (fo two-ow aangement) and contact NTN Engineeing fo technical assistance. Data 1 In the high-speed egion of 1 min -1, the noise level of the HSL type is 6 dba to 8 dba lowe than that of the conventional type (HSC type) (Fig. 9.3). Noise value dba HSFL type HSF type Test conditions Test beaing Shaft speed Peload 5S-2LA-HSFL2DB 5S-2LA-HSF2DB ( ows) 2 min kn (constant pessue peloading) Speedmin dmn value 1 6 Fig. 9.3 Compaison of noise levels 76

81 NTN Main Spindle Beaings Data 2 Fo 5S-HSFL type beaings, the tempeatue of the oute ings emains stable even with an ai consumption as low as 1 NR/min (5 to 25% of the ecommended ai consumption fo standad beaings) at a speed of 21 min -1 (dmn ) (Fig. 9.31). Tempeatue incease of oute ing C HSFL type HSF type Test conditions Test beaing Shaft speed Peload Oil consumption 5S-2LA-HSFL2DB 5S-2LA-HSF2DB ( ows) 21 min kn(constant pessue peloading).3 ml/shot (oil shot intevals, 5 min) Ai consumptionnl/min Fig Relationship between ai consumption and tempeatue incease Data 3 The 5S-HSFL type beaings can opeate at 21 min -1 (dmn ) with oil shot intevals of 21 min (eduction of 2 to 9% as compaed with the ecommended oil consumption fo standad beaings) (Fig. 9.32). Tempeatue incease of oute ing C HSFL type HSF type Oil shot intevalsmin Unstable Fig Relationship between oil shot intevals and tempeatue incease Test conditions Test beaing Shaft speed Peload Oil consumption Ai consumption 5S-2LA-HSFL2DB 5S-2LA-HSF2DB ( ows) 21 min kn (constant pessue peloading).3 ml/shot 12.5 NL/min Data 4 5S-HSL type beaings can eliably un at a speed of 19 min -1 (fixed position peloading) (Fig. 9.33) with both decease ai and oil consumption. Tempeatue incease of oute ing C HSL type HSE type Unstable Speedmin dmn value 1 6 Fig High-speed test esults (fixed position peloading) Test conditions Test beaing Shaft speed Peload Oil consumption Ai consumption 5S-2LA-HSL2DB 5S-2LA-HSE2DB ( ows) 119 min -1 Afte assembly, (fixed position peloading).3 ml/shot (oil shot intevals, 1 min) 1 NL/min (HSL) 3 NL/min (HSE) 77

82 NTN Main Spindle Beaings!7 Ai-oil lubicated high-speed angula ball beaings with e-lubicating hole on the oute ing HSEW Type HSEW type is an ai-oil lubicated high-speed angula ball beaing equipped with e-lubicating holes on the oute ing of the HSE type. Because thee is no equiement fo poviding a nozzle hole on the space, the space width can be kept shot, contibuting to the moe compact main spindle and impovement of spindle igidity due to the placement of the beaings on the tool tip side. In addition, lubication eliability is inceased due to the diect lubication fom the oute ing, enabling the eduction of ai consumption and the supplied oil amount. Beaing specification Re-lubicating hole O-ing Cicumfeential oil goove Re-lubicating hole Space with e-lubicating hole Beaings with e-lubicating hole on the oute ing Space with e-lubicating hole (standad beaings) Fig HSEW Type Featues 1. Compact main spindle design is possible due to the shote space 2. Highe e-lubicating efficiency by the diect lubication fom the oute ing 3. Reduced noise level due to the ai eduction effect Pemissible speed ange dmn value S-2LA-HSEW S-2LA-HSEW9U 25 2 Notes) Pemissible speed of each beaing (dmn value) vaies depending on the specifications of the machine on which the beaing is used (moto dive system, cooling system, and constuction aound the beaing). Conside the optimal choice efeing to the above guideline (fo two-ow aangement) and contact NTN Engineeing fo technical assistance. About chamfeing of e-lubicating hole on the housing Ensue to povide chamfeing on the e-lubicating hole of the housing to avoid damage of oute O-ing when the HSEW type is inseted into the housing (Fig. 9.35). We ecommend that chamfeing is only applied to the hole. About phases of e-lubicating hole on the housing and e-lubicating hole on the oute ing Fo poducing the ai eduction effect, be sue to stagge the position of e-lubicating hole on the housing and e-lubicating hole on the oute ing. Chamfeing Only on the hole: ecommended Chamfeing Oveall cicumfeential goove (chamfeing) Fig Chamfeing of e-lubicating hole on the housing 78

83 NTN Main Spindle Beaings Data 1 Fo the HSEW type beaings, the tempeatue of the oute ings emains stable even with an ai consumption as low as 2 NR/min (1/2 of the ecommended ai consumption fo standad beaings) at a speed of 18, min -1 (dmn value: 2.25X1 6 ) (Fig. 9.36). Tempeatue incease of oute ing C HSEW type HSE type Ai consumptionnl/min Fig Relationship between ai consumption and tempeatue incease Test conditions Test beaing Shaft speed Peload Oil consumption 5S-2LA-HSEW2 5S-2LA-HSE2 ( ows) 18 min knafte assembled (Fixed position peloading).3 ml/shot (oil shot intevals) HSEW : 1 min, HSE : 5 min Data 2 The HSEW type beaings can opeate at 18, min -1 (dmn value: 2.25X1 6 ) with an oil shot inteval of 2 min (1/4 of the ecommended oil consumption fo standad beaings) (Fig. 9.37). Tempeatue incease of oute ing C HSEW type HSE type Test conditions Test beaing Shaft speed Peload Ai consumption 5S-2LA-HSEW2 5S-2LA-HSE2 ( ows) 18 min knafte assembled (Fixed position peloading) HSEW : 2NL/min HSE : 4NL/min Oil shot intevalmin Fig Relationship between oil shot inteval and tempeatue incease Data 3 The HSEW type has achieved educed noise level compaed with the HSE type (Fig. 9.38). Noise value dba HSEW type HSE type Speed Test conditions Test beaing Shaft speed Peload Ai consumption Oil consumption 5S-2LA-HSEW2 5S-2LA-HSE2 ( ows) 18 min knafte assembled (Fixed position peloading) HSEW : 2NL/min HSE : 4NL/min.3 ml/shot (oil shot intevals) HSEW : 1 min, HSE : 5 min Fig Compaison of noise levels 79

84 NTN Main Spindle Beaings!8 Gease-lubicated sealed standad angula contact ball beaings 79LLB and 7LLB, 5S-79LLB and 5S-7LLB types The 79LLB and 7LLB types ae gease-lubicated, eco-fiendly beaings that can achieve stable high-speed opeation with limited tempeatue ise. They can allow, longe sevice life and pesevation of healthy woking envionment fo otating tools with shaft diametes less than 5 mm. Featues 1. Intenal design is optimized fo high-speed opeation and limited tempeatue ise. 2. Longe gease life due to adoption of special gease and non-contact seals fo gease etention. 3. Contact angles of 15 and 25 ae available. 4. The standad types meet special pecision P42 equiements (dimensional pecision JIS P4 and unning accuacy JIS P2). 5. Seals of diffeent colos ae used fo font (black) and back (oange) sides. Beaing configuation can be easily identified by colo. 6. Available with eithe steel o ceamic balls. Beaing specifications Back Font Fig LLB and 7LLB types Simplified main spindle configuation Due to the optimized intenal stuctue, the 79LLB and 7LLB types can eliably un at a highe speed with gease lubication. The gease lubicating system is vitually fee fom oil mist emission, and contibutes to a simple main spindle stuctue, eduction in envionmental impact and decease in cost. (Fig. 9.4) Ai-oil lubication Gease lubication Simplifies the main spindle stuctue, and educes the initial and opeation costs. Fig. 9.4 Modification of lubication system (ai-oil lubication to gease lubication) Easie handling with 79LLB and 7LLB types The 79LLB and 7LLB types ae pefilled with gease. They can be eadily used afte only wiping away ust peventive oil. Seals of diffeent colos ae used fo the font and back sides of the beaing. Black seals ae used fo the font sides and oange seals ae used fo the back sides, so configuations ae eadily identified by colos. (Table 9.26) Table 9.26 Beaing Combinations and Seal Colos DB set (back faces in combination) DF set (font faces in combination) Oange seal Oange seal Black seal Black seal 8

85 NTN Main Spindle Beaings Pemissible speed ange dmn value LLB LLB S-7 LLB S-79 LLB Notes) Pemissible speed of each beaing (dmn value) vaies depending on the specifications of the machine on which the beaing is used (moto dive system, cooling system, and constuction aound the beaing). Conside the optimal choice efeing to the above guideline (fo two-ow aangement) and contact NTN Engineeing fo technical assistance. High-speed test Optimization of the intenal design pomotes stable opeation of dmn value (Figs.9.41 and 9.42) Tempeatue ise of oute ing C CDw/o jacket cooling 76CDw/ jacket cooling 76ADw/o jacket cooling 76ADw/ jacket cooling Speedmin -1 Tested beaing Shaft speed Pe-load afte assembled 76CDLLBDBP42 76ADLLBDBP42 ( ows) 25 min N5S-76CDLLB 25 N5S-76ADLLB dmn value 1 6 Fig High-speed test esults (76CD, contact angle 15 ) (76AD, contact angle 25 ) Tempeatue ise of oute ing C S-76CDw/o jacket cooling 5S-76CDw/ jacket cooling 5S-76ADw/o jacket cooling 5S-76ADw/ jacket cooling Speedmin dmn value 1 6 Test conditions Tested beaing Shaft speed Pe-load afte assembled 5S-76CDLLBDBP42 5S-76ADLLBDBP42 ( ows) 25 min N5S-76CDLLB 25 N5S-76ADLLB Fig High-speed test esults (5S-76CD, contact angle 15 ) (5S-76AD, contact angle 25 ) 81

86 NTN Main Spindle Beaings!8 Gease-lubicated sealed angula contact ball beaings BNS LLB and 5S-2LA-BNS LLB types By the optimized mateial and intenal stuctue, BNS LLB type beaings have excellent pefomance at highe speeds. This helps to educe pollution and cost. Beaing specification Featues 1. Adoption of special mateials and unique intenal design impove anti-seizue popeties (15 times bette than the conventional type) and wea esistance (6 times bette than the conventional type). 2. Optimized intenal design enables high-speed opeation and high igidity. 3. Available with eithe steel o ceamic balls. 4. Adoption of gease pockets, special gease, and non-contact seals impoves sevice life of the gease. Fig BNS LLB type Simplified main spindle configuation BNS LLB type beaings can eliably opeate at a highe speed with gease lubication. The gease lubication system is vitually fee fom oil mist emission can simplify the main spindle stuctue, educe pollution and decease cost (Fig. 9.44). Ai-oil lubication Gease lubication Capable of eplacing ai-oil lubicated beaings up to dmn value of 1,4,. Simplifies the main spindle stuctue and educes the initial and opeating costs. Fig Modification of lubication system (ai-oil lubication to gease lubication) Easie handling with BNS LLB type The BNS LLB type has been packed with gease in advance. They can be used afte wiping away ust peventive oil. Seals in diffeent colos ae used fo the font and back sides of the beaings. Black seals ae used fo the font sides and oange seals ae used fo the back sides, so configuations can be easily identified by colo. (Table 9.27) Table 9.27 Beaing Combinations and Seal Colos DB set (back faces in combination) DF set (font faces in combination) Oange seal Oange seal Black seal Black seal 82

87 NTN Main Spindle Beaings Pemissible speed ange dmn value LA-BNS LLB 25 15, 2 2LA-BNS9 LLB 25 15, 2 5S-2LA-BNS LLB 25 15, 2 5S-2LA-BNS9 LLB 25 15, 2 Notes) Pemissible speed of each beaing (dmn value) vaies depending on the specifications of the machine on which the beaing is used (moto dive system, cooling system, and constuction aound the beaing). Conside the optimal choice efeing to the above guideline (fo two-ow aangement) and contact NTN Engineeing fo technical assistance. Tempeatue incease 5S-2LA-BNS LLB type beaings exhibit stable tempeatue incease up to a dmn value of 1,4, (Fig. 9.45). Tempeatue incease of oute ing C Speedmin -1 Test conditions Test beaing Shaft speed Oute casing cooling 5S-2LA-BNS2 LLBDB ( ows) 11 min -1 Povided dmn value 1 6 Fig High-speed test esults Duability test As a esult of optimized design (such as gease esevoi) and special gease, 5S-2LA-BNS LLB type beaing have successfully achieved continuous opeation in excess of 2, hous at a dmn value of 1,4, (Fig. 9.46). Test conditions BNS type HSB type 65h 2 h o longe Moe than 25 times Test beaing Shaft speed Peload Oute casing cooling 5S-2LA-BNS2 LLBDB 5S-HSB2C ( ows) 11 min -1 Afte assembly, Povided Duation, h Fig Duability test esults 83

88 Main Spindle Dimension tables fo angula contact ball beaings Standad angula contact ball beaings (steel ball type) 78 seies Contact angle 15 d 25 17mm B 1 D D1 d d1 D2 a pat Bounday dimensions Basic load atings Static axial Facto Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co fo lubication lubication 785C C C C C C C C C C C C C C C C C C C C C C C C Minimum allowable value fo cone adius dimension o 1. 84

89 Main Spindle Beaings 1as as da Db as as da Da Dynamic equivalent adial load PXFYFa ifofa Co e Single ow / Tandem FaFe FaFe X Y 1.44 Back-to-back / Face-to-face FaFe FaFe X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm 3 kg mm mm Single-ow Single-ow da Da Db as 1as a (appox.) (appox.) d1 D1 D2 min max max max max C C C C C C C C C C C C C C C C C C C C C C C C 85

90 Main Spindle Beaings Standad angula contact ball beaings (steel ball type) 79 seies Contact angle 15 d 1 17mm B 1 B 1 D D1d2 d d1 D2 D D1 d d1 D2 a d a d 86 Pat Bounday dimensions Basic load atings Static axial Facto Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co fo lubication lubication 79UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC CT1B CT1B CT1B CT1B Minimum allowable value fo cone adius dimension o 1.

91 Main Spindle Beaings 1as as da Db as as da Da Dynamic equivalent adial load PXFYFa ifofa Co e Single ow / Tandem FaFe FaFe X Y 1.44 Back-to-back / Face-to-face FaFe FaFe X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm 3 kg mm mm Single-ow Single-ow da Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min max max max max UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC CT1B CT1B CT1B CT1B 87

92 Main Spindle Beaings Standad angula contact ball beaings (steel ball type) 79 seies Contact angle 25 d 1 13mm B 1 D D1 d2 dd1 D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co lubication lubication 79UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD Minimum allowable value fo cone adius dimension o 1. 88

93 Main Spindle Beaings 1as as as da Db as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm 3 kg mm mm Single-ow Single-ow da Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min max max max max UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD 89

94 Main Spindle Beaings Standad angula contact ball beaings (steel ball type) 79 seies Contact angle 3 d 1 13mm B 1 B 1 D D1d2 d d1 D2 D D1 d d1 D2 a d a d Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co lubication lubication 79U U U U U U U U U U U U U U U U U U U U U U U U U Minimum allowable value fo cone adius dimension o 1. 9

95 Main Spindle Beaings 1as as as da Db as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm 3 kg mm mm Single-ow Single-ow da Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min max max max max U U U U U U U U U U U U U U U U U U U U U U U U U 91

96 Main Spindle Beaings Standad angula contact ball beaings (steel ball type) 7 seies Contact angle 15 d 1 2mm B 1 B 1 D D1d2 d d1 D2 D D1 d d1 D2 a d a d 92 Pat Bounday dimensions Basic load atings Static axial Facto Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co fo lubication lubication 7UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC CT1B CT1B CT1B CT1B CT1B CT1B CT1B Minimum allowable value fo cone adius dimension o 1.

97 Main Spindle Beaings 1as as da Db as as da Da Dynamic equivalent adial load PXFYFa ifofa Co e Single ow / Tandem FaFe FaFe X Y 1.44 Back-to-back / Face-to-face FaFe FaFe X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm 3 kg mm mm Single-ow Single-ow da Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min max max max max UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC UC CT1B CT1B CT1B CT1B CT1B CT1B CT1B 93

98 Main Spindle Beaings Standad angula contact ball beaings (steel ball type) 7 seies Contact angle 25 d 1 13mm B 1 D D1 d2 dd1 D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co lubication lubication 7UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD Minimum allowable value fo cone adius dimension o 1. 94

99 Main Spindle Beaings 1as as as da Db as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm 3 kg mm mm Single-ow Single-ow da Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min max max max max UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD UAD 95

100 Main Spindle Beaings Standad angula contact ball beaings (steel ball type) 7 seies Contact angle 3 d 1 13mm B 1 D D1 d2 dd1 D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co lubication lubication 7U U U U U U U U U U U U U U U U U U U U U U U U U Minimum allowable value fo cone adius dimension o 1. 96

101 Main Spindle Beaings 1as as as da Db as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm 3 kg mm mm Single-ow Single-ow da Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min max max max max U U U U U U U U U U U U U U U U U U U U U U U U U 97

102 Main Spindle Beaings Standad angula contact ball beaings (steel ball type) 72 seies Contact angle 15 d 1 13mm B 1 D D1 d d1 D2 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co fo lubication lubication 72C C C C C C C C C C C C C C C C C C C C C CT1B CT1B CT1B CT1B Minimum allowable value fo cone adius dimension o 1. 98

103 Main Spindle Beaings 1as as da Db as as da Da Dynamic equivalent adial load PXFYFa ifofa Co e Single ow / Tandem FaFe FaFe X Y 1.44 Back-to-back / Face-to-face FaFe FaFe X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm 3 kg mm mm Single-ow Single-ow da Da Db as 1as a (appox.) (appox.) d1 D1 D2 min max max max max C C C C C C C C C C C C C C C C C C C C C CT1B CT1B CT1B CT1B 99

104 Main Spindle Beaings Standad angula contact ball beaings (ceamic ball type) 5S-79 seies Contact angle 15 d 1 13mm B 1 D D1 d2 dd1 D2 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co fo lubication lubication 5S-79UC S-791UC S-792UC S-793UC S-794UC S-795UC S-796UC S-797UC S-798UC S-799UC S-791UC S-7911UC S-7912UC S-7913UC S-7914UC S-7915UC S-7916UC S-7917UC S-7918UC S-7919UC S-792UC S-7921UC S-7922UC S-7924UC S-7926UC Minimum allowable value fo cone adius dimension o 1. 1

105 Main Spindle Beaings 1as as da Db as as da Da Dynamic equivalent adial load PXFYFa ifofa Co e Single ow / Tandem FaFe FaFe X Y 1.44 Back-to-back / Face-to-face FaFe FaFe X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm 3 kg mm mm Single-ow Single-ow da Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min max max max max S-79UC S-791UC S-792UC S-793UC S-794UC S-795UC S-796UC S-797UC S-798UC S-799UC S-791UC S-7911UC S-7912UC S-7913UC S-7914UC S-7915UC S-7916UC S-7917UC S-7918UC S-7919UC S-792UC S-7921UC S-7922UC S-7924UC S-7926UC 11

106 Main Spindle Beaings Standad angula contact ball beaings (ceamic ball type) 5S-79 seies Contact angle 25 d 1 13mm B 1 D D1 d2 dd1 D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co lubication lubication 5S-79UAD S-791UAD S-792UAD S-793UAD S-794UAD S-795UAD S-796UAD S-797UAD S-798UAD S-799UAD S-791UAD S-7911UAD S-7912UAD S-7913UAD S-7914UAD S-7915UAD S-7916UAD S-7917UAD S-7918UAD S-7919UAD S-792UAD S-7921UAD S-7922UAD S-7924UAD S-7926UAD Minimum allowable value fo cone adius dimension o 1. 12

107 Main Spindle Beaings 1as as as da Db as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm 3 kg mm mm Single-ow Single-ow da Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min max max max max S-79UAD S-791UAD S-792UAD S-793UAD S-794UAD S-795UAD S-796UAD S-797UAD S-798UAD S-799UAD S-791UAD S-7911UAD S-7912UAD S-7913UAD S-7914UAD S-7915UAD S-7916UAD S-7917UAD S-7918UAD S-7919UAD S-792UAD S-7921UAD S-7922UAD S-7924UAD S-7926UAD 13

108 Main Spindle Beaings Standad angula contact ball beaings (ceamic ball type) 5S-79 seies Contact angle 3 d 1 13mm B 1 D D1 d2 dd1 D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co lubication lubication 5S-79U S-791U S-792U S-793U S-794U S-795U S-796U S-797U S-798U S-799U S-791U S-7911U S-7912U S-7913U S-7914U S-7915U S-7916U S-7917U S-7918U S-7919U S-792U S-7921U S-7922U S-7924U S-7926U Minimum allowable value fo cone adius dimension o 1. 14

109 Main Spindle Beaings 1as as as da Db as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm 3 kg mm mm Single-ow Single-ow da Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min max max max max S-79U S-791U S-792U S-793U S-794U S-795U S-796U S-797U S-798U S-799U S-791U S-7911U S-7912U S-7913U S-7914U S-7915U S-7916U S-7917U S-7918U S-7919U S-792U S-7921U S-7922U S-7924U S-7926U 15

110 Main Spindle Beaings Standad angula contact ball beaings (ceamic ball type) 5S-7 seies Contact angle 15 d 1 13mm B 1 D D1 d2 dd1 D2 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co fo lubication lubication 5S-7UC S-71UC S-72UC S-73UC S-74UC S-75UC S-76UC S-77UC S-78UC S-79UC S-71UC S-711UC S-712UC S-713UC S-714UC S-715UC S-716UC S-717UC S-718UC S-719UC S-72UC S-721UC S-722UC S-724UC S-726UC Minimum allowable value fo cone adius dimension o 1. 16

111 Main Spindle Beaings 1as as da Db as as da Da Dynamic equivalent adial load PXFYFa ifofa Co e Single ow / Tandem FaFe FaFe X Y 1.44 Back-to-back / Face-to-face FaFe FaFe X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm 3 kg mm mm Single-ow Single-ow da Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min max max max max S-7UC S-71UC S-72UC S-73UC S-74UC S-75UC S-76UC S-77UC S-78UC S-79UC S-71UC S-711UC S-712UC S-713UC S-714UC S-715UC S-716UC S-717UC S-718UC S-719UC S-72UC S-721UC S-722UC S-724UC S-726UC 17

112 Main Spindle Beaings Standad angula contact ball beaings (ceamic ball type) 5S-7 seies Contact angle 25 d 1 13mm B 1 D D1 d2 dd1 D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co lubication lubication 5S-7UAD S-71UAD S-72UAD S-73UAD S-74UAD S-75UAD S-76UAD S-77UAD S-78UAD S-79UAD S-71UAD S-711UAD S-712UAD S-713UAD S-714UAD S-715UAD S-716UAD S-717UAD S-718UAD S-719UAD S-72UAD S-721UAD S-722UAD S-724UAD S-726UAD Minimum allowable value fo cone adius dimension o 1. 18

113 Main Spindle Beaings 1as as as da Db as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm 3 kg mm mm Single-ow Single-ow da Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min max max max max S-7UAD S-71UAD S-72UAD S-73UAD S-74UAD S-75UAD S-76UAD S-77UAD S-78UAD S-79UAD S-71UAD S-711UAD S-712UAD S-713UAD S-714UAD S-715UAD S-716UAD S-717UAD S-718UAD S-719UAD S-72UAD S-721UAD S-722UAD S-724UAD S-726UAD 19

114 Main Spindle Beaings Standad angula contact ball beaings (ceamic ball type) 5S-7 seies Contact angle 3 d 1 13mm B 1 D D1 d2 dd1 D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co lubication lubication 5S-7U S-71U S-72U S-73U S-74U S-75U S-76U S-77U S-78U S-79U S-71U S-711U S-712U S-713U S-714U S-715U S-716U S-717U S-718U S-719U S-72U S-721U S-722U S-724U S-726U Minimum allowable value fo cone adius dimension o 1. 11

115 Main Spindle Beaings 1as as as da Db as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm 3 kg mm mm Single-ow Single-ow da Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min max max max max S-7U S-71U S-72U S-73U S-74U S-75U S-76U S-77U S-78U S-79U S-71U S-711U S-712U S-713U S-714U S-715U S-716U S-717U S-718U S-719U S-72U S-721U S-722U S-724U S-726U 111

116 Main Spindle Beaings High-speed angula contact ball beaings (steel ball type) 2LA-HSE9U seies Contact angle 15 d 5 17mm B 1 1 D D1 d2 d d1 D2 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co fo lubication lubication 2LA-HSE91UC LA-HSE911UC LA-HSE912UC LA-HSE913UC LA-HSE914UC LA-HSE915UC LA-HSE916UC LA-HSE917UC LA-HSE918UC LA-HSE919UC LA-HSE92UC LA-HSE921UC LA-HSE922UC LA-HSE924UC LA-HSE926UC LA-HSE928UC LA-HSE93UC LA-HSE932UC LA-HSE934UC Minimum allowable value fo cone adius dimension o

117 Main Spindle Beaings 1as as dadb as 1as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.52 Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm 3 kg mm mm Single-ow Single-ow da db Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min min max max max max

118 Main Spindle Beaings High-speed angula contact ball beaings (steel ball type) 2LA-HSE9U seies Contact angle 2 d 5 17mm B 1 1 D D1 d2 d d1 D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co lubication lubication 2LA-HSE91U LA-HSE911U LA-HSE912U LA-HSE913U LA-HSE914U LA-HSE915U LA-HSE916U LA-HSE917U LA-HSE918U LA-HSE919U LA-HSE92U LA-HSE921U LA-HSE922U LA-HSE924U LA-HSE926U LA-HSE928U LA-HSE93U LA-HSE932U LA-HSE934U Minimum allowable value fo cone adius dimension o

119 Main Spindle Beaings 1as as as dadb 1as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm 3 kg mm mm Single-ow Single-ow da db Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min min max max max max

120 Main Spindle Beaings High-speed angula contact ball beaings (steel ball type) 2LA-HSE9U seies Contact angle 25 d 5 17mm B 1 1 D D1 d2 d d1 D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co lubication lubication 2LA-HSE91UAD LA-HSE911UAD LA-HSE912UAD LA-HSE913UAD LA-HSE914UAD LA-HSE915UAD LA-HSE916UAD LA-HSE917UAD LA-HSE918UAD LA-HSE919UAD LA-HSE92UAD LA-HSE921UAD LA-HSE922UAD LA-HSE924UAD LA-HSE926UAD LA-HSE928UAD LA-HSE93UAD LA-HSE932UAD LA-HSE934UAD Minimum allowable value fo cone adius dimension o

121 Main Spindle Beaings 1as as as dadb 1as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm 3 kg mm mm Single-ow Single-ow da db Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min min max max max max

122 Main Spindle Beaings High-speed angula contact ball beaings (steel ball type) 2LA-HSE seies Contact angle 15 d 5 17mm B 1 1 D D1 d2 d d1 D2 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co fo lubication lubication 2LA-HSE1C LA-HSE11C LA-HSE12C LA-HSE13C LA-HSE14C LA-HSE15C LA-HSE16C LA-HSE17C LA-HSE18C LA-HSE19C LA-HSE2C LA-HSE21C LA-HSE22C LA-HSE24C LA-HSE26C LA-HSE28C LA-HSE3C LA-HSE32C LA-HSE34C Minimum allowable value fo cone adius dimension o

123 Main Spindle Beaings 1as as dadb as 1as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.52 Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm 3 kg mm mm Single-ow Single-ow da db Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min min max max max max

124 Main Spindle Beaings High-speed angula contact ball beaings (steel ball type) 2LA-HSE seies Contact angle 2 d 5 17mm B 1 1 D D1 d2 d d1 D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co lubication lubication 2LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE LA-HSE Minimum allowable value fo cone adius dimension o 1. 12

125 Main Spindle Beaings 1as as as dadb 1as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm 3 kg mm mm Single-ow Single-ow da db Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min min max max max max

126 Main Spindle Beaings High-speed angula contact ball beaings (steel ball type) 2LA-HSE seies Contact angle 25 d 5 17mm B 1 1 D D1 d2 d d1 D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co lubication lubication 2LA-HSE1AD LA-HSE11AD LA-HSE12AD LA-HSE13AD LA-HSE14AD LA-HSE15AD LA-HSE16AD LA-HSE17AD LA-HSE18AD LA-HSE19AD LA-HSE2AD LA-HSE21AD LA-HSE22AD LA-HSE24AD LA-HSE26AD LA-HSE28AD LA-HSE3AD LA-HSE32AD LA-HSE34AD Minimum allowable value fo cone adius dimension o

127 Main Spindle Beaings 1as as as dadb 1as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm 3 kg mm mm Single-ow Single-ow da db Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min min max max max max

128 Main Spindle Beaings High-speed angula contact ball beaings (ceamic ball type) 5S-2LA-HSE9U seies Contact angle 15 d 5 17mm B 1 1 D D1 d2 d d1 D2 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co fo lubication lubication 5S-2LA-HSE91UC S-2LA-HSE911UC S-2LA-HSE912UC S-2LA-HSE913UC S-2LA-HSE914UC S-2LA-HSE915UC S-2LA-HSE916UC S-2LA-HSE917UC S-2LA-HSE918UC S-2LA-HSE919UC S-2LA-HSE92UC S-2LA-HSE921UC S-2LA-HSE922UC S-2LA-HSE924UC S-2LA-HSE926UC S-2LA-HSE928UC S-2LA-HSE93UC S-2LA-HSE932UC S-2LA-HSE934UC Minimum allowable value fo cone adius dimension o

129 Main Spindle Beaings 1as as dadb as 1as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.52 Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm 3 kg mm mm Single-ow Single-ow da db Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min min max max max max

130 Main Spindle Beaings High-speed angula contact ball beaings (ceamic ball type) 5S-2LA-HSE9U seies Contact angle 2 d 5 17mm B 1 1 D D1 d2 d d1 D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co lubication lubication 5S-2LA-HSE91U S-2LA-HSE911U S-2LA-HSE912U S-2LA-HSE913U S-2LA-HSE914U S-2LA-HSE915U S-2LA-HSE916U S-2LA-HSE917U S-2LA-HSE918U S-2LA-HSE919U S-2LA-HSE92U S-2LA-HSE921U S-2LA-HSE922U S-2LA-HSE924U S-2LA-HSE926U S-2LA-HSE928U S-2LA-HSE93U S-2LA-HSE932U S-2LA-HSE934U Minimum allowable value fo cone adius dimension o

131 Main Spindle Beaings 1as as as dadb 1as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm 3 kg mm mm Single-ow Single-ow da db Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min min max max max max

132 Main Spindle Beaings High-speed angula contact ball beaings (ceamic ball type) 5S-2LA-HSE9U seies Contact angle 25 d 5 17mm B 1 1 D D1 d2 d d1 D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co lubication lubication 5S-2LA-HSE91UAD S-2LA-HSE911UAD S-2LA-HSE912UAD S-2LA-HSE913UAD S-2LA-HSE914UAD S-2LA-HSE915UAD S-2LA-HSE916UAD S-2LA-HSE917UAD S-2LA-HSE918UAD S-2LA-HSE919UAD S-2LA-HSE92UAD S-2LA-HSE921UAD S-2LA-HSE922UAD S-2LA-HSE924UAD S-2LA-HSE926UAD S-2LA-HSE928UAD S-2LA-HSE93UAD S-2LA-HSE932UAD S-2LA-HSE934UAD Minimum allowable value fo cone adius dimension o

133 Main Spindle Beaings 1as as as dadb 1as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm 3 kg mm mm Single-ow Single-ow da db Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min min max max max max

134 Main Spindle Beaings High-speed angula contact ball beaings (ceamic ball type) 5S-2LA-HSE seies Contact angle 15 d 5 17mm B 1 1 D D1 d2 d d1 D2 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co fo lubication lubication 5S-2LA-HSE1C S-2LA-HSE11C S-2LA-HSE12C S-2LA-HSE13C S-2LA-HSE14C S-2LA-HSE15C S-2LA-HSE16C S-2LA-HSE17C S-2LA-HSE18C S-2LA-HSE19C S-2LA-HSE2C S-2LA-HSE21C S-2LA-HSE22C S-2LA-HSE24C S-2LA-HSE26C S-2LA-HSE28C S-2LA-HSE3C S-2LA-HSE32C S-2LA-HSE34C Minimum allowable value fo cone adius dimension o 1. 13

135 Main Spindle Beaings 1as as dadb as 1as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.52 Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm 3 kg mm mm Single-ow Single-ow da db Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min min max max max max

136 Main Spindle Beaings High-speed angula contact ball beaings (ceamic ball type) 5S-2LA-HSE seies Contact angle 2 d 5 17mm B 1 1 D D1 d2 d d1 D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co lubication lubication 5S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE S-2LA-HSE Minimum allowable value fo cone adius dimension o

137 Main Spindle Beaings 1as as as dadb 1as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm 3 kg mm mm Single-ow Single-ow da db Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min min max max max max

138 Main Spindle Beaings High-speed angula contact ball beaings (ceamic ball type) 5S-2LA-HSE seies Contact angle 25 d 5 17mm B 1 1 D D1 d2 d d1 D2 a Pat Bounday dimensions Basic load atings Static axial Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co lubication lubication 5S-2LA-HSE1AD S-2LA-HSE11AD S-2LA-HSE12AD S-2LA-HSE13AD S-2LA-HSE14AD S-2LA-HSE15AD S-2LA-HSE16AD S-2LA-HSE17AD S-2LA-HSE18AD S-2LA-HSE19AD S-2LA-HSE2AD S-2LA-HSE21AD S-2LA-HSE22AD S-2LA-HSE24AD S-2LA-HSE26AD S-2LA-HSE28AD S-2LA-HSE3AD S-2LA-HSE32AD S-2LA-HSE34AD Minimum allowable value fo cone adius dimension o

139 Main Spindle Beaings 1as as as dadb 1as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm 3 kg mm mm Single-ow Single-ow da db Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min min max max max max

140 Main Spindle Beaings Supe high-speed angula contact ball beaings 5S-2LA-HSF seies Contact angle 25 d 5 1mm B 1 1 DD1 d2 d d1 D2 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 oil d D B s min 1 1s min 1 C Co C Co lubication 5S-2LA-HSF1AD S-2LA-HSF11AD S-2LA-HSF12AD S-2LA-HSF13AD S-2LA-HSF14AD S-2LA-HSF15AD S-2LA-HSF16AD S-2LA-HSF17AD S-2LA-HSF18AD S-2LA-HSF19AD S-2LA-HSF2AD Minimum allowable value fo cone adius dimension o

141 Main Spindle Beaings 1as as as dadb 1as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm 3 kg mm mm Single-ow Single-ow da db Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min min max max max max

142 Main Spindle Beaings Eco-fiendly angula contact ball beaings (ceamic ball type) 5S-2LA-HSL9U seies Contact angle 2 d 5 13mm B 1 1 D dd1d2 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 oil d D B s min 1 1s min 1 C Co C Co lubication 5S-2LA-HSL91U S-2LA-HSL911U S-2LA-HSL912U S-2LA-HSL913U S-2LA-HSL914U S-2LA-HSL915U S-2LA-HSL916U S-2LA-HSL917U S-2LA-HSL918U S-2LA-HSL919U S-2LA-HSL92U S-2LA-HSL921U S-2LA-HSL922U S-2LA-HSL924U S-2LA-HSL926U Minimum allowable value fo cone adius dimension o 1. 2 Fo the details of space dimensions, please contact NTN Engineeing. 138

143 Main Spindle Beaings l 1as as da Db Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm mm Single-ow da Db 1as l 2 a (appox.) d1 D2 min max max min S-2LA-HSL91U S-2LA-HSL911U S-2LA-HSL912U S-2LA-HSL913U S-2LA-HSL914U S-2LA-HSL915U S-2LA-HSL916U S-2LA-HSL917U S-2LA-HSL918U S-2LA-HSL919U S-2LA-HSL92U S-2LA-HSL921U S-2LA-HSL922U S-2LA-HSL924U S-2LA-HSL926U 139

144 Main Spindle Beaings Eco-fiendly angula contact ball beaings (ceamic ball type) 5S-2LA-HSL9U seies Contact angle 25 d 5 13mm B 1 1 D dd1d2 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 oil d D B s min 1 1s min 1 C Co C Co lubication 5S-2LA-HSL91UAD S-2LA-HSL911UAD S-2LA-HSL912UAD S-2LA-HSL913UAD S-2LA-HSL914UAD S-2LA-HSL915UAD S-2LA-HSL916UAD S-2LA-HSL917UAD S-2LA-HSL918UAD S-2LA-HSL919UAD S-2LA-HSL92UAD S-2LA-HSL921UAD S-2LA-HSL922UAD S-2LA-HSL924UAD S-2LA-HSL926UAD Minimum allowable value fo cone adius dimension o 1. 2 Fo the details of space dimensions, please contact NTN Engineeing. 14

145 Main Spindle Beaings l 1as as da Db Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm mm Single-ow da Db 1as l 2 a (appox.) d1 D2 min max max min S-2LA-HSL91UAD S-2LA-HSL911UAD S-2LA-HSL912UAD S-2LA-HSL913UAD S-2LA-HSL914UAD S-2LA-HSL915UAD S-2LA-HSL916UAD S-2LA-HSL917UAD S-2LA-HSL918UAD S-2LA-HSL919UAD S-2LA-HSL92UAD S-2LA-HSL921UAD S-2LA-HSL922UAD S-2LA-HSL924UAD S-2LA-HSL926UAD 141

146 Main Spindle Beaings Eco-fiendly angula contact ball beaings (ceamic ball type) 5S-2LA-HSL seies Contact angle 2 d 5 13mm B 1 1 D dd1d2 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 oil d D B s min 1 1s min 1 C Co C Co lubication 5S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL Minimum allowable value fo cone adius dimension o 1. 2 Fo the details of space dimensions, please contact NTN Engineeing. 142

147 Main Spindle Beaings l 1as as da Db Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm mm Single-ow da Db 1as l 2 a (appox.) d1 D2 min max max min S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL S-2LA-HSL26 143

148 Main Spindle Beaings Eco-fiendly angula contact ball beaings (ceamic ball type) 5S-2LA-HSL seies Contact angle 25 d 5 13mm B 1 1 D dd1d2 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 oil d D B s min 1 1s min 1 C Co C Co lubication 5S-2LA-HSL1AD S-2LA-HSL11AD S-2LA-HSL12AD S-2LA-HSL13AD S-2LA-HSL14AD S-2LA-HSL15AD S-2LA-HSL16AD S-2LA-HSL17AD S-2LA-HSL18AD S-2LA-HSL19AD S-2LA-HSL2AD S-2LA-HSL21AD S-2LA-HSL22AD S-2LA-HSL24AD S-2LA-HSL26AD Minimum allowable value fo cone adius dimension o 1. 2 Fo the details of space dimensions, please contact NTN Engineeing. 144

149 Main Spindle Beaings l 1as as da Db Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm mm Single-ow da Db 1as l 2 a (appox.) d1 D2 min max max min S-2LA-HSL1AD S-2LA-HSL11AD S-2LA-HSL12AD S-2LA-HSL13AD S-2LA-HSL14AD S-2LA-HSL15AD S-2LA-HSL16AD S-2LA-HSL17AD S-2LA-HSL18AD S-2LA-HSL19AD S-2LA-HSL2AD S-2LA-HSL21AD S-2LA-HSL22AD S-2LA-HSL24AD S-2LA-HSL26AD 145

150 Main Spindle Beaings Eco-fiendly angula contact ball beaings (ceamic ball type) 5S-2LA-HSFL seies Contact angle 25 d 5 1mm B 1 1 D d d1 D2 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 oil d D B s min 1 1s min 1 C Co C Co lubication 5S-2LA-HSFL1AD S-2LA-HSFL11AD S-2LA-HSFL12AD S-2LA-HSFL13AD S-2LA-HSFL14AD S-2LA-HSFL15AD S-2LA-HSFL16AD S-2LA-HSFL17AD S-2LA-HSFL18AD S-2LA-HSFL19AD S-2LA-HSFL2AD Minimum allowable value fo cone adius dimension o 1. 2 Fo the details of space dimensions, please contact NTN Engineeing. 146

151 Main Spindle Beaings l 1as as da Db Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm mm Single-ow da Db 1as l 2 a (appox.) d1 D2 min max max min S-2LA-HSFL1AD S-2LA-HSFL11AD S-2LA-HSFL12AD S-2LA-HSFL13AD S-2LA-HSFL14AD S-2LA-HSFL15AD S-2LA-HSFL16AD S-2LA-HSFL17AD S-2LA-HSFL18AD S-2LA-HSFL19AD S-2LA-HSFL2AD 147

152 Main Spindle Beaings Ai-oil lubicated high-speed angula ball beaings with e-lubicating hole on the oute ing 5S-2LA-HSEW9U type Contact angle 2 d 5 1mm 1 B 1 Sn Sb Gb Bn Gb Bn D D1 d2 d d1 D2 Enlaged view a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 oil d D B Bn Sn Sb Gb s min 1 1s min 1 C Co C Co (Static) lubication 5S-2LA-HSEW91U S-2LA-HSEW911U S-2LA-HSEW912U S-2LA-HSEW913U S-2LA-HSEW914U S-2LA-HSEW915U S-2LA-HSEW916U S-2LA-HSEW917U S-2LA-HSEW918U S-2LA-HSEW919U S-2LA-HSEW92U Minimum allowable value fo cone adius dimension o

153 Main Spindle Beaings 1as as Back-to-back (DB) da Db db Da as 1as Face-to-face (DF) Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm 3 kg mm mm Single-ow Single-ow da db Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min min max max max max

154 Main Spindle Beaings Ai-oil lubicated high-speed angula ball beaings with e-lubicating hole on the oute ing 5S-2LA-HSEW9U type Contact angle 25 d 5 1mm 1 B 1 Sn Sb Gb Bn Gb Bn D D1 d2 d d1 D2 Enlaged view a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 oil d D B Bn Sn Sb Gb s min 1 1s min 1 C Co C Co (Static) lubication 5S-2LA-HSEW91UAD S-2LA-HSEW911UAD S-2LA-HSEW912UAD S-2LA-HSEW913UAD S-2LA-HSEW914UAD S-2LA-HSEW915UAD S-2LA-HSEW916UAD S-2LA-HSEW917UAD S-2LA-HSEW918UAD S-2LA-HSEW919UAD S-2LA-HSEW92UAD Minimum allowable value fo cone adius dimension o 1. 15

155 Main Spindle Beaings 1as as Back-to-back (DB) da Db db Da as 1as Face-to-face (DF) Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm 3 kg mm mm Single-ow Single-ow da db Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min min max max max max

156 Main Spindle Beaings Ai-oil lubicated high-speed angula ball beaings with e-lubicating hole on the oute ing 5S-2LA-HSEW type Contact angle 2 d 5 1mm 1 B 1 Sn Sb Gb Bn Gb Bn D D1 d2 d d1 D2 Enlaged view a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 oil d D B Bn Sn Sb Gb s min 1 1s min 1 C Co C Co (Static) lubication 5S-2LA-HSEW S-2LA-HSEW S-2LA-HSEW S-2LA-HSEW S-2LA-HSEW S-2LA-HSEW S-2LA-HSEW S-2LA-HSEW S-2LA-HSEW S-2LA-HSEW S-2LA-HSEW Minimum allowable value fo cone adius dimension o

157 Main Spindle Beaings 1as as Back-to-back (DB) da Db db Da as 1as Face-to-face (DF) Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm 3 kg mm mm Single-ow Single-ow da db Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min min max max max max

158 Main Spindle Beaings Ai-oil lubicated high-speed angula ball beaings with e-lubicating hole on the oute ing 5S-2LA-HSEW type Contact angle 25 d 5 1mm 1 B 1 Sn Sb Gb Bn Gb Bn D D1 d2 d d1 D2 Enlaged view a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 oil d D B Bn Sn Sb Gb s min 1 1s min 1 C Co C Co (Static) lubication 5S-2LA-HSEW1AD S-2LA-HSEW11AD S-2LA-HSEW12AD S-2LA-HSEW13AD S-2LA-HSEW14AD S-2LA-HSEW15AD S-2LA-HSEW16AD S-2LA-HSEW17AD S-2LA-HSEW18AD S-2LA-HSEW19AD S-2LA-HSEW2AD Minimum allowable value fo cone adius dimension o

159 Main Spindle Beaings 1as as Back-to-back (DB) da Db db Da as 1as Face-to-face (DF) Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions cente fee space mm cm 3 kg mm mm Single-ow Single-ow da db Da Db as 1as a (appox.) (appox.) d1 d2 D1 D2 min min max max max max

160 Main Spindle Beaings Sealed standad angula contact ball beaings (steel ball type) 79 LLB seies Contact angle 15 d 1 5mm B 1 D D1 dd1 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease d D B s min 1 1s min 1 C Co C Co fo lubication 79CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB Minimum allowable value fo cone adius dimension o

161 Main Spindle Beaings 1as as dadb as as da Da Dynamic equivalent adial load PXFYFa ifofa Co e Single ow / Tandem FaFe FaFe X Y 1.44 Back-to-back / Face-to-face FaFe FaFe X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm mm Single-ow da Da Db as 1as a (appox.) d1 D1 min max max max max CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB 157

162 Main Spindle Beaings Sealed standad angula contact ball beaings (steel ball type) 79 LLB seies Contact angle 25 d 1 5mm B 1 D D1 dd1 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease d D B s min 1 1s min 1 C Co C Co lubication 79ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB Minimum allowable value fo cone adius dimension o

163 Main Spindle Beaings 1as as as dadb as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm mm Single-ow da Da Db as 1as a (appox.) d1 D1 min max max max max ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB 159

164 Main Spindle Beaings Sealed standad angula contact ball beaings (steel ball type) 7 LLB seies Contact angle 15 d 1 5mm B 1 D D1 dd1 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease d D B s min 1 1s min 1 C Co C Co fo lubication 7CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB Minimum allowable value fo cone adius dimension o 1. 16

165 Main Spindle Beaings 1as as dadb as as da Da Dynamic equivalent adial load PXFYFa ifofa Co e Single ow / Tandem FaFe FaFe X Y 1.44 Back-to-back / Face-to-face FaFe FaFe X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm mm Single-ow da Da Db as 1as a (appox.) d1 D1 min max max max max CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB CDLLB 161

166 Main Spindle Beaings Sealed standad angula contact ball beaings (steel ball type) 7 LLB seies Contact angle 25 d 1 5mm B 1 D D1 dd1 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease d D B s min 1 1s min 1 C Co C Co lubication 7ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB Minimum allowable value fo cone adius dimension o

167 Main Spindle Beaings 1as as as dadb as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm mm Single-ow da Da Db as 1as a (appox.) d1 D1 min max max max max ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB ADLLB 163

168 Main Spindle Beaings Sealed standad angula contact ball beaings (ceamic ball type) 5S-79 LLB seies Contact angle 15 d 1 5mm B 1 D D1 dd1 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease d D B s min 1 1s min 1 C Co C Co fo lubication 5S-79CDLLB S-791CDLLB S-792CDLLB S-793CDLLB S-794CDLLB S-795CDLLB S-796CDLLB S-797CDLLB S-798CDLLB S-799CDLLB S-791CDLLB Minimum allowable value fo cone adius dimension o

169 Main Spindle Beaings 1as as dadb as as da Da Dynamic equivalent adial load PXFYFa ifofa Co e Single ow / Tandem FaFe FaFe X Y 1.44 Back-to-back / Face-to-face FaFe FaFe X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm mm Single-ow da Da Db as 1as a (appox.) d1 D1 min max max max max S-79CDLLB S-791CDLLB S-792CDLLB S-793CDLLB S-794CDLLB S-795CDLLB S-796CDLLB S-797CDLLB S-798CDLLB S-799CDLLB S-791CDLLB 165

170 Main Spindle Beaings Sealed standad angula contact ball beaings (ceamic ball type) 5S-79 LLB seies Contact angle 25 d 1 5mm B 1 D D1 dd1 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease d D B s min 1 1s min 1 C Co C Co lubication 5S-79ADLLB S-791ADLLB S-792ADLLB S-793ADLLB S-794ADLLB S-795ADLLB S-796ADLLB S-797ADLLB S-798ADLLB S-799ADLLB S-791ADLLB Minimum allowable value fo cone adius dimension o

171 Main Spindle Beaings 1as as as dadb as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm mm Single-ow da Da Db as 1as a (appox.) d1 D1 min max max max max S-79ADLLB S-791ADLLB S-792ADLLB S-793ADLLB S-794ADLLB S-795ADLLB S-796ADLLB S-797ADLLB S-798ADLLB S-799ADLLB S-791ADLLB 167

172 Main Spindle Beaings Sealed standad angula contact ball beaings (ceamic ball type) 5S-7 LLB seies Contact angle 15 d 1 5mm B 1 D D1 dd1 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease d D B s min 1 1s min 1 C Co C Co fo lubication 5S-7CDLLB S-71CDLLB S-72CDLLB S-73CDLLB S-74CDLLB S-75CDLLB S-76CDLLB S-77CDLLB S-78CDLLB S-79CDLLB S-71CDLLB Minimum allowable value fo cone adius dimension o

173 Main Spindle Beaings 1as as dadb as as da Da Dynamic equivalent adial load PXFYFa ifofa Co e Single ow / Tandem FaFe FaFe X Y 1.44 Back-to-back / Face-to-face FaFe FaFe X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm mm Single-ow da Da Db as 1as a (appox.) d1 D1 min max max max max S-7CDLLB S-71CDLLB S-72CDLLB S-73CDLLB S-74CDLLB S-75CDLLB S-76CDLLB S-77CDLLB S-78CDLLB S-79CDLLB S-71CDLLB 169

174 Main Spindle Beaings Sealed standad angula contact ball beaings (ceamic ball type) 5S-7 LLB seies Contact angle 25 d 1 5mm B 1 D D1 dd1 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease d D B s min 1 1s min 1 C Co C Co lubication 5S-7ADLLB S-71ADLLB S-72ADLLB S-73ADLLB S-74ADLLB S-75ADLLB S-76ADLLB S-77ADLLB S-78ADLLB S-79ADLLB S-71ADLLB Minimum allowable value fo cone adius dimension o 1. 17

175 Main Spindle Beaings 1as as as dadb as da Da Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence Abutment and fillet dimensions Pat cente dimensions numbe mm kg mm mm Single-ow da Da Db as 1as a (appox.) d1 D1 min max max max max S-7ADLLB S-71ADLLB S-72ADLLB S-73ADLLB S-74ADLLB S-75ADLLB S-76ADLLB S-77ADLLB S-78ADLLB S-79ADLLB S-71ADLLB 171

176 Main Spindle Beaings Sealed high-speed angula contact ball beaings (steel ball type) 2LA-BNS9 LLB seies Contact angle 15 d 5 1mm B 1 D D1 d2 d d1 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease d D B s min 1 1s min 1 C Co C Co fo lubication 2LA-BNS91CLLB LA-BNS911CLLB LA-BNS912CLLB LA-BNS913CLLB LA-BNS914CLLB LA-BNS915CLLB LA-BNS916CLLB LA-BNS917CLLB LA-BNS918CLLB LA-BNS919CLLB LA-BNS92CLLB Minimum allowable value fo cone adius dimension o

177 Main Spindle Beaings as as dada as 1as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.52 Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm mm Single-ow da db Da as 1as a (appox.) d1 d2 D1 min min max max max LA-BNS91CLLB LA-BNS911CLLB LA-BNS912CLLB LA-BNS913CLLB LA-BNS914CLLB LA-BNS915CLLB LA-BNS916CLLB LA-BNS917CLLB LA-BNS918CLLB LA-BNS919CLLB LA-BNS92CLLB 173

178 Main Spindle Beaings Sealed high-speed angula contact ball beaings (steel ball type) 2LA-BNS9 LLB seies Contact angle 2 d 5 1mm B 1 D D1 d2 d d1 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease d D B s min 1 1s min 1 C Co C Co lubication 2LA-BNS91LLB LA-BNS911LLB LA-BNS912LLB LA-BNS913LLB LA-BNS914LLB LA-BNS915LLB LA-BNS916LLB LA-BNS917LLB LA-BNS918LLB LA-BNS919LLB LA-BNS92LLB Minimum allowable value fo cone adius dimension o

179 Main Spindle Beaings as as as dada 1as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm mm Single-ow da db Da as 1as a (appox.) d1 d2 D1 min min max max max LA-BNS91LLB LA-BNS911LLB LA-BNS912LLB LA-BNS913LLB LA-BNS914LLB LA-BNS915LLB LA-BNS916LLB LA-BNS917LLB LA-BNS918LLB LA-BNS919LLB LA-BNS92LLB 175

180 Main Spindle Beaings Sealed high-speed angula contact ball beaings (steel ball type) 2LA-BNS9 LLB seies Contact angle 25 d 5 1mm B 1 D D1 d2 d d1 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease d D B s min 1 1s min 1 C Co C Co lubication 2LA-BNS91ADLLB LA-BNS911ADLLB LA-BNS912ADLLB LA-BNS913ADLLB LA-BNS914ADLLB LA-BNS915ADLLB LA-BNS916ADLLB LA-BNS917ADLLB LA-BNS918ADLLB LA-BNS919ADLLB LA-BNS92ADLLB Minimum allowable value fo cone adius dimension o

181 Main Spindle Beaings as as as dada 1as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm mm Single-ow da db Da as 1as a (appox.) d1 d2 D1 min min max max max LA-BNS91ADLLB LA-BNS911ADLLB LA-BNS912ADLLB LA-BNS913ADLLB LA-BNS914ADLLB LA-BNS915ADLLB LA-BNS916ADLLB LA-BNS917ADLLB LA-BNS918ADLLB LA-BNS919ADLLB LA-BNS92ADLLB 177

182 Main Spindle Beaings Sealed high-speed angula contact ball beaings (steel ball type) 2LA-BNS LLB seies Contact angle 15 d 45 1mm B 1 D D1 d2 d d1 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease d D B s min 1 1s min 1 C Co C Co fo lubication 2LA-BNS9CLLB LA-BNS1CLLB LA-BNS11CLLB LA-BNS12CLLB LA-BNS13CLLB LA-BNS14CLLB LA-BNS15CLLB LA-BNS16CLLB LA-BNS17CLLB LA-BNS18CLLB LA-BNS19CLLB LA-BNS2CLLB Minimum allowable value fo cone adius dimension o

183 Main Spindle Beaings as as dada as 1as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.52 Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm mm Single-ow da db Da as 1as a (appox.) d1 d2 D1 min min max max max LA-BNS9CLLB LA-BNS1CLLB LA-BNS11CLLB LA-BNS12CLLB LA-BNS13CLLB LA-BNS14CLLB LA-BNS15CLLB LA-BNS16CLLB LA-BNS17CLLB LA-BNS18CLLB LA-BNS19CLLB LA-BNS2CLLB 179

184 Main Spindle Beaings Sealed high-speed angula contact ball beaings (steel ball type) 2LA-BNS LLB seies Contact angle 2 d 45 1mm B 1 D D1 d2 d d1 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease d D B s min 1 1s min 1 C Co C Co lubication 2LA-BNS9LLB LA-BNS1LLB LA-BNS11LLB LA-BNS12LLB LA-BNS13LLB LA-BNS14LLB LA-BNS15LLB LA-BNS16LLB LA-BNS17LLB LA-BNS18LLB LA-BNS19LLB LA-BNS2LLB Minimum allowable value fo cone adius dimension o 1. 18

185 Main Spindle Beaings as as as dada 1as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm mm Single-ow da db Da as 1as a (appox.) d1 d2 D1 min min max max max LA-BNS9LLB LA-BNS1LLB LA-BNS11LLB LA-BNS12LLB LA-BNS13LLB LA-BNS14LLB LA-BNS15LLB LA-BNS16LLB LA-BNS17LLB LA-BNS18LLB LA-BNS19LLB LA-BNS2LLB 181

186 Main Spindle Beaings Sealed high-speed angula contact ball beaings (steel ball type) 2LA-BNS LLB seies Contact angle 25 d 45 1mm B 1 D D1 d2 d d1 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease d D B s min 1 1s min 1 C Co C Co lubication 2LA-BNS9ADLLB LA-BNS1ADLLB LA-BNS11ADLLB LA-BNS12ADLLB LA-BNS13ADLLB LA-BNS14ADLLB LA-BNS15ADLLB LA-BNS16ADLLB LA-BNS17ADLLB LA-BNS18ADLLB LA-BNS19ADLLB LA-BNS2ADLLB Minimum allowable value fo cone adius dimension o

187 Main Spindle Beaings as as as dada 1as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm mm Single-ow da db Da as 1as a (appox.) d1 d2 D1 min min max max max LA-BNS9ADLLB LA-BNS1ADLLB LA-BNS11ADLLB LA-BNS12ADLLB LA-BNS13ADLLB LA-BNS14ADLLB LA-BNS15ADLLB LA-BNS16ADLLB LA-BNS17ADLLB LA-BNS18ADLLB LA-BNS19ADLLB LA-BNS2ADLLB 183

188 Main Spindle Beaings Sealed high-speed angula contact ball beaings (ceamic ball type) 5S-2LA-BNS9 LLB seies Contact angle 15 d 5 1mm B 1 D D1 d2 d d1 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease d D B s min 1 1s min 1 C Co C Co fo lubication 5S-2LA-BNS91CLLB S-2LA-BNS911CLLB S-2LA-BNS912CLLB S-2LA-BNS913CLLB S-2LA-BNS914CLLB S-2LA-BNS915CLLB S-2LA-BNS916CLLB S-2LA-BNS917CLLB S-2LA-BNS918CLLB S-2LA-BNS919CLLB S-2LA-BNS92CLLB Minimum allowable value fo cone adius dimension o

189 Main Spindle Beaings as as dada as 1as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.52 Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm mm Single-ow da db Da as 1as a (appox.) d1 d2 D1 min min max max max S-2LA-BNS91CLLB S-2LA-BNS911CLLB S-2LA-BNS912CLLB S-2LA-BNS913CLLB S-2LA-BNS914CLLB S-2LA-BNS915CLLB S-2LA-BNS916CLLB S-2LA-BNS917CLLB S-2LA-BNS918CLLB S-2LA-BNS919CLLB S-2LA-BNS92CLLB 185

190 Main Spindle Beaings Sealed high-speed angula contact ball beaings (ceamic ball type) 5S-2LA-BNS9 LLB seies Contact angle 2 d 5 1mm B 1 D D1 d2 d d1 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease d D B s min 1 1s min 1 C Co C Co lubication 5S-2LA-BNS91LLB S-2LA-BNS911LLB S-2LA-BNS912LLB S-2LA-BNS913LLB S-2LA-BNS914LLB S-2LA-BNS915LLB S-2LA-BNS916LLB S-2LA-BNS917LLB S-2LA-BNS918LLB S-2LA-BNS919LLB S-2LA-BNS92LLB Minimum allowable value fo cone adius dimension o

191 Main Spindle Beaings as as as dada 1as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm mm Single-ow da db Da as 1as a (appox.) d1 d2 D1 min min max max max S-2LA-BNS91LLB S-2LA-BNS911LLB S-2LA-BNS912LLB S-2LA-BNS913LLB S-2LA-BNS914LLB S-2LA-BNS915LLB S-2LA-BNS916LLB S-2LA-BNS917LLB S-2LA-BNS918LLB S-2LA-BNS919LLB S-2LA-BNS92LLB 187

192 Main Spindle Beaings Sealed high-speed angula contact ball beaings (ceamic ball type) 5S-2LA-BNS9 LLB seies Contact angle 25 d 5 1mm B 1 D D1 d2 d d1 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease d D B s min 1 1s min 1 C Co C Co lubication 5S-2LA-BNS91ADLLB S-2LA-BNS911ADLLB S-2LA-BNS912ADLLB S-2LA-BNS913ADLLB S-2LA-BNS914ADLLB S-2LA-BNS915ADLLB S-2LA-BNS916ADLLB S-2LA-BNS917ADLLB S-2LA-BNS918ADLLB S-2LA-BNS919ADLLB S-2LA-BNS92ADLLB Minimum allowable value fo cone adius dimension o

193 Main Spindle Beaings as as as dada 1as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm mm Single-ow da db Da as 1as a (appox.) d1 d2 D1 min min max max max S-2LA-BNS91ADLLB S-2LA-BNS911ADLLB S-2LA-BNS912ADLLB S-2LA-BNS913ADLLB S-2LA-BNS914ADLLB S-2LA-BNS915ADLLB S-2LA-BNS916ADLLB S-2LA-BNS917ADLLB S-2LA-BNS918ADLLB S-2LA-BNS919ADLLB S-2LA-BNS92ADLLB 189

194 Main Spindle Beaings Sealed high-speed angula contact ball beaings (ceamic ball type) 5S-2LA-BNS LLB seies Contact angle 15 d 45 1mm B 1 D D1 d2 d d1 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease d D B s min 1 1s min 1 C Co C Co fo lubication 5S-2LA-BNS9CLLB S-2LA-BNS1CLLB S-2LA-BNS11CLLB S-2LA-BNS12CLLB S-2LA-BNS13CLLB S-2LA-BNS14CLLB S-2LA-BNS15CLLB S-2LA-BNS16CLLB S-2LA-BNS17CLLB S-2LA-BNS18CLLB S-2LA-BNS19CLLB S-2LA-BNS2CLLB Minimum allowable value fo cone adius dimension o 1. 19

195 Main Spindle Beaings as as dada as 1as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.52 Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm mm Single-ow da db Da as 1as a (appox.) d1 d2 D1 min min max max max S-2LA-BNS9CLLB S-2LA-BNS1CLLB S-2LA-BNS11CLLB S-2LA-BNS12CLLB S-2LA-BNS13CLLB S-2LA-BNS14CLLB S-2LA-BNS15CLLB S-2LA-BNS16CLLB S-2LA-BNS17CLLB S-2LA-BNS18CLLB S-2LA-BNS19CLLB S-2LA-BNS2CLLB 191

196 Main Spindle Beaings Sealed high-speed angula contact ball beaings (ceamic ball type) 5S-2LA-BNS LLB seies Contact angle 2 d 45 1mm B 1 D D1 d2 d d1 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease d D B s min 1 1s min 1 C Co C Co lubication 5S-2LA-BNS9LLB S-2LA-BNS1LLB S-2LA-BNS11LLB S-2LA-BNS12LLB S-2LA-BNS13LLB S-2LA-BNS14LLB S-2LA-BNS15LLB S-2LA-BNS16LLB S-2LA-BNS17LLB S-2LA-BNS18LLB S-2LA-BNS19LLB S-2LA-BNS2LLB Minimum allowable value fo cone adius dimension o

197 Main Spindle Beaings as as as dada 1as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm mm Single-ow da db Da as 1as a (appox.) d1 d2 D1 min min max max max S-2LA-BNS9LLB S-2LA-BNS1LLB S-2LA-BNS11LLB S-2LA-BNS12LLB S-2LA-BNS13LLB S-2LA-BNS14LLB S-2LA-BNS15LLB S-2LA-BNS16LLB S-2LA-BNS17LLB S-2LA-BNS18LLB S-2LA-BNS19LLB S-2LA-BNS2LLB 193

198 Main Spindle Beaings Sealed high-speed angula contact ball beaings (ceamic ball type) 5S-2LA-BNS LLB seies Contact angle 25 d 45 1mm B 1 D D1 d2 d d1 a Pat Bounday dimensions Basic load atings Static axial Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease d D B s min 1 1s min 1 C Co C Co lubication 5S-2LA-BNS9ADLLB S-2LA-BNS1ADLLB S-2LA-BNS11ADLLB S-2LA-BNS12ADLLB S-2LA-BNS13ADLLB S-2LA-BNS14ADLLB S-2LA-BNS15ADLLB S-2LA-BNS16ADLLB S-2LA-BNS17ADLLB S-2LA-BNS18ADLLB S-2LA-BNS19ADLLB S-2LA-BNS2ADLLB Minimum allowable value fo cone adius dimension o

199 Main Spindle Beaings as as as dada 1as dbda Dynamic equivalent adial loadpxfyfa Single ow / Tandem Back-to-back / Face-to-face e Fa Fe Fa Fe Fa Fe Fa Fe X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial loadpoxo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Mass Refeence dimensions Abutment and fillet dimensions Pat cente numbe mm kg mm mm Single-ow da db Da as 1as a (appox.) d1 d2 D1 min min max max max S-2LA-BNS9ADLLB S-2LA-BNS1ADLLB S-2LA-BNS11ADLLB S-2LA-BNS12ADLLB S-2LA-BNS13ADLLB S-2LA-BNS14ADLLB S-2LA-BNS15ADLLB S-2LA-BNS16ADLLB S-2LA-BNS17ADLLB S-2LA-BNS18ADLLB S-2LA-BNS19ADLLB S-2LA-BNS2ADLLB 195

200 Main Spindle Beaings Angula contact ball beaings fo motos and lathes (steel ball type) BNT9 seies Contact angle 15 d 1 65mm B 1 D D1d2 d d1 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co fo lubication lubication BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT Minimum allowable value fo cone adius dimension o

201 Main Spindle Beaings as as dada as 1as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.52 Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm 3 kg mm mm Single-ow Single-ow da db Da as 1as a (appox.) (appox.) d1 d2 D1 min min max max max BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT

202 Main Spindle Beaings Angula contact ball beaings fo motos and lathes (steel ball type) BNT seies Contact angle 15 d 1 7mm B 1 D D1d2 d d1 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co fo lubication lubication BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT Minimum allowable value fo cone adius dimension o

203 Main Spindle Beaings as as dada as 1as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.52 Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm 3 kg mm mm Single-ow Single-ow da db Da as 1as a (appox.) (appox.) d1 d2 D1 min min max max max BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT14 199

204 Main Spindle Beaings Angula contact ball beaings fo motos and lathes (steel ball type) BNT2 seies Contact angle 15 d 1 8mm B 1 D D1d2 d d1 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co fo lubication lubication BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT Minimum allowable value fo cone adius dimension o 1. 2

205 Main Spindle Beaings as as dada as 1as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.52 Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm 3 kg mm mm Single-ow Single-ow da db Da as 1as a (appox.) (appox.) d1 d2 D1 min min max max max BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT BNT216 21

206 Main Spindle Beaings Angula contact ball beaings fo motos and lathes (ceamic ball type) 5S-BNT9 seies Contact angle 15 d 1 65mm B 1 D D1d2 d d1 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co fo lubication lubication 5S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT Minimum allowable value fo cone adius dimension o 1. 22

207 Main Spindle Beaings as as dada as 1as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.52 Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm 3 kg mm mm Single-ow Single-ow da db Da as 1as a (appox.) (appox.) d1 d2 D1 min min max max max S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT913 23

208 Main Spindle Beaings Angula contact ball beaings fo motos and lathes (ceamic ball type) 5S-BNT seies Contact angle 15 d 1 7mm B 1 D D1d2 d d1 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co fo lubication lubication 5S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT Minimum allowable value fo cone adius dimension o 1. 24

209 Main Spindle Beaings as as dada as 1as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.52 Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm 3 kg mm mm Single-ow Single-ow da db Da as 1as a (appox.) (appox.) d1 d2 D1 min min max max max S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT14 25

210 Main Spindle Beaings Angula contact ball beaings fo motos and lathes (ceamic ball type) 5S-BNT2 seies Contact angle 15 d 1 8mm B 1 D D1d2 d d1 a Pat Bounday dimensions Basic load atings Static axial Facto Limiting numbe dynamic static dynamic static load capacity speed mm kn kgf kn kgf min -1 gease oil d D B s min 1 1s min 1 C Co C Co fo lubication lubication 5S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT Minimum allowable value fo cone adius dimension o 1. 26

211 Main Spindle Beaings as as dada as 1as dbda Dynamic equivalent adial load PXFYFa Single ow / Tandem Back-to-back / Face-to-face ifofa e FaFe FaFe FaFe FaFe Co X Y X Y X Y X Y Back-to-back (DB) Face-to-face (DF) Static equivalent adial load PoXo FYo Fa Single ow / Tandem Back-to-back / Face-to-face Xo.52 Yo Xo Yo When Po F with single-ow o tandem aangement, Po F. Load Intenal Mass Refeence dimensions Abutment and fillet dimensions Pat cente fee space numbe mm cm 3 kg mm mm Single-ow Single-ow da db Da as 1as a (appox.) (appox.) d1 d2 D1 min min max max max S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT S-BNT216 27

212 28 NTN Main Spindle Beaings

213 NTN Main Spindle Beaings Main Spindle Beaings 1. Cylindical Rolle Beaings CONTENTS 1. Cylindical olle beaings q Double-ow cylindical olle beaings 21 w Single-ow cylindical olle beaings 21 e Beaing designations 211 Accuacy of tapeed boe 211 t Accuacy of cylindical olle beaings 212 y Radial intenal cleaance of cylindical olle beaings 214 u Recommended fit of high-pecision cylindical olle beaings 216 i Recommended lubication specifications 217 o Ulta high speed double ow cylindical olle beaings NN3HSRT6 type 218! Ulta high-speed single ow cylindical olle beaings N1HSRT6 type 22!1 Eco-fiendly ai-oil lubicated ulta high speed single ow cylindical olle beaings N1HSLT6 type 222!2 Dimension tables fo cylindical olle beaings Double-ow cylindical olle beaings 224 High speed single-ow cylindical olle beaings 23 Ulta high-speed single ow cylindical olle beaings 234 Eco-fiendly ulta high-speed single ow cylindical olle beaings 236!3 Tape gage and intenal cleaance adjustment gage fo NTN pecision cylindical olle beaings 238!4 Dimension tables fo tape gage 238!5 Dimension table fo mounted intenal cleaance adjustment gage

214 NTN Main Spindle Beaings 1. Cylindical Rolle Beaings In a cylindical olle beaing, the olles and aceways ae in linea contact. Consequently this type of beaing can suppot a lage adial load than a point-contact ball beaing. Also, its stuctue is suitable fo high-speed opeation. A cylindical olle beaing used fo the main spindle of a machine tool can have eithe a double- o singleow configuation, and cetain vaiants have a tapeed boe so the adial intenal cleaance can be adjusted. 1 Double-ow cylindical olle beaings Double-ow cylindical olle beaings ae available in two types, NN and NNU, and two seies, 3 and 49. The olles in the NN type beaing ae guided by the ibs of the inne ing. The olles in the NNU type beaing ae guided by the ibs of the oute ing. Beaings ae available with eithe a tapeed boe type (which allows adjustment of adial intenal cleaance of beaing) o a standad cylindical boe. The beaings come in two types, standad type and high-speed HS type. Standad cage is machined bass. 2 Single-ow cylindical olle beaings Single-ow cylindical olle beaings ae available in two types, high-speed N1HS type and ulta highspeed N1HSRT6 type. The N1HS type beaings have high-stength machined bass cages, while the N1HSR type beaings have special molded esin cages, which can be used fo both gease lubication and ai-oil lubication. The eco-fiendly N1HSLT6 type is a vaiation fom the high-speed N1HSRT6 type beaing and can be used with ai-oil lubication only. Cylindical boe N1HS type Tapeed boe Cylindical boe N1HSR type Tapeed boe Cylindical boe NNU type Tapeed boe Cylindical boe N1HSL type Tapeed boe Fig. 1.2 Cylindical boe NN type Fig. 1.1 Tapeed boe 21

215 NTN Main Spindle Beaings 3 Beaing designations NN49, 3, NNU49 type NN 3 2 HS RT6 K CNA P4 Pecision class P5JIS class 5P2JIS class 2 P4JIS class 4 UPSpecialhighpecision Intenal cleaance codesee Table ExtenalconfiguationcodeKTapeedinneingboetapeatio1/12 No codecylindical inne ing boe No codemachined bass boe T6Molded PEEK cage. IntenalmodificationcodeNocodeStandadspecification HSHighspeedspecification Boe diamete code HSRUlta Highspeedspecification Dimension seies code Beaing type codenndouble ow with ibbed inne ing NNUDouble ow with ibbed oute ing N1HS, N1HSR type N 1 2 HSR T6 K CNA P4 Cage code T6MoldedPEEKcage HSRtype No codehigh stength machined bass cage Intenalmodificationcode HSHigh speed specification HSRUlta highspeedspecification N1HSL type N 1 2 HSL T6 K CNA P4 +TKZ Space code Eco- fiendly nozzle Cage code T6PEEK esin mold cage Intenalmodificationcode Beaingtypecode NSingle ow with ibbed inne ing 4 Accuacy of tapeed boe NTN specifies the accuacies of tapeed boes confoming with JIS Classes 4 and 2 as shown below. Poo accuacies of the tapeed boe lead to misalignment of the inne ing, causing poo pefomance, pematue seizue and flaking. Use of a tape gauge is ecommended fo highe accuacy of the main spindle. Refe to "6 Handling of Beaings, 8 Tapeed boe cylindical olle beaing and main spindle tape angle" in the Technical Data section fo moe infomation on tape angle. Table 1.1 Toleance of tape-boed beaings Unit: d Δdmp Δd1mpΔdmp (appox.) Vdp Class 4 Class 2 Class 4 Class 2 Class 4 Class 2 ove incl. high low high low high low high low max Note: NTN specification d d1 B Theoetical tapeed boe ddmp d1mpdmp d1d1mp B Tapeed boe having single plane mean boe diamete deviation Toleance of 1/12 tape angle d1d B 12 VdpSingle adial plane boe diamete vaiation dmpsingle plane mean boe diamete deviation (at theoetical small end on tapeed boe) d1mpsingle plane mean boe diamete deviation (at theoetical lage end on tapeed boe) BNominal inne ing width Fig

216 NTN Main Spindle Beaings 5 Accuacy of cylindical olle beaings Table 1.2 Inne ings Nominal boe diamete d Deviation of mean boe diamete in a single plane Δdmp Class 5 Class 4 1 Class 2 1 ove incl. high low high low high low Vaiation of boe diamete in a single plane Vdsp Diamete seies 9 Diamete seies Class 5 Class 4 Class 2 Class 5 Class 4 Class 2 max max Vaiation of mean boe diamete Vdmp Class 5 Class 4 Class 2 max Inne ing adial unout Kia Class 5 Class 4 Class 2 max 1 The toleance of boe diamete deviation Δds applicable to classes 4 and 2 is the same as the toleance of single plane mean boe diamete deviation Δdmp Table 1.3 Oute ings Nominal boe diamete D Deviation of mean outside diamete in a single plane Vaiation of outside diamete in a single plane ΔDmp VDsp Class 5 Class 4 2 Class 2 2 Class 5 Class 4 Class 2 Class 5 Class 4 Class 2 Diamete seies 9 Diamete seies ove incl. high low high low high low max max Vaiation of mean outside diamete VDmp Class 5 Class 4 Class 2 max Oute ing adial unout Kea Class 5 Class 4 Class 2 max The toleance of outside diamete deviation ΔDs applicable to classes 4 and 2 is the same as the toleance of mean single plane outside diamete deviation ΔDmp. 212

217 NTN Main Spindle Beaings Pependiculaity of inne ing face with espect to the boe Width deviation ΔBs Single beaing Sd Class 5 Class 4 Class 2 Class 5 Class 4 Class 2 max high low high low Unit: Width vaiation VBs Class 5 Class 4 Class 2 max Pependiculaity of oute ing outside suface with espect to the face SD Class 5 Class 4 Class 2 max Width deviation ΔCs All classes Unit: Width vaiation VCs Class 5 Class 4 Class 2 max Identical to ΔBs elative to d on the same beaing

218 NTN Main Spindle Beaings 6 Radial intenal cleaance of cylindical olle beaings Non-intechangeable adial intenal cleaance Two types of adial intenal cleaance ae available: non-intechangeable adial intenal cleaance fo which the combination of oute ing and inne ing cannot be changed; and intechangeable adial intenal cleaance that allows fo diffeent oute ing and inne ing combination. The cleaances listed ae common to both double-ow and the single-ow cylindical olle beaings. Fo machine components including highpecision machine tool main spindle, beaings with nonintechangeable adial intenal cleaance and a small cleaance ange ae used. If a double-low tapeed boe beaing is used and the desied mounted intenal cleaance is close to zeo, use of cleaance in the ange between C9NA and CINA is ecommended. Cylindical boe beaings with non-intechangeable adial intenal cleaance ae also available. Fo details, contact NTN Engineeing. Table 1.4 Cylindical boe beaings Unit: Nominal boe diamete Cylindical boe beaing d 1 ove incl. min max min max min max The code fo nomal intenal cleaance is NA. Ex: N16HSNA Table 1.5 Tapeed boe beaings Nominal boe diamete d 2 2 Tapeed boe beaing 2 ove incl. min max min max min max min max Unit: 1 min max The code fo nomal intenal cleaance is "NA". Ex: N16HSKNA 2 Intenal cleaances C9NA, CNA and C1NA apply to beaings of JIS class 5 o highe. 214

219 NTN Main Spindle Beaings Intechangeable adial intenal cleaance (cylindical boe) Table 1.6 Nominal boe diamete d incl. (Nomal) Unit: ove min max min max min max Adjustment of cleaance in tapeed boe beaings Mounted intenal cleaance of a tapeed boe beaing can be adjusted by contolling the dive-up of the tapeed boe onto the shaft. Two types of adjusting methods aea available: epeated adjustment of space width and adjustment with using a mounted intenal cleaance gauge. The cleaance gauge is convenient fo mass-poduction. Refe to "6. Handling of Beaings, 7 Cleaance adjustment fo cylindical olle beaing, measuement with mounted intenal cleaance gage" in the Technical Data section. 215

220 NTN Main Spindle Beaings 7 Recommended fit of high-pecision cylindical olle beaings In ode to maintain the high pecision of a pecision beaing unde dmn value is lowe than the fits listed in Tables 1.7 and 1.8 ae ecommended (dmn: pitch cicle diamete acoss olling elements [mm] multiplied by speed [min -1 ]). When the dmn value is lage than (dmn value ), consult NTN Engineeing about the ecommended fit. Expansion of the inne ing due to centifugal foce must be consideed when detemining shaft fit. Table 1.7 Fit with shaft Unit: Table 1.8 Fit with housing Unit: Nominal boe diamete d ove incl. Fit between inne ing and shaft Nominal boe diamete D ove incl. Fit between oute ing and housing T 5T 1T6T T 4T 4T T6T 2T8T 2T8T T 5T 6T Note 1: Taget the median value. T: Tight (Intefeence) fit Not applicable to tapeed boe beaings 3T1T 4T11T Note 1: Taget the median value. T: Tight (Intefeence) fit T 8T 9T Fit of tapeed boe beaings When fitting a tapeed boe beaing onto a shaft, caefully and thooughly adjust the fit of the tapeed boe to the shaft to maintain high pecision of the beaing. Fo details of tape angle adjustment efe to "6. Handling of Beaings, 8 Cylindical olle beaing and main spindle tape angle" in the Technical Data section. 216

221 NTN Main Spindle Beaings 8 Recommended lubication specifications Cylindical olle beaings ae usually used with gease lubication o ai-oil lubication. Recommended lubication specifications ae descibed below. Gease lubication Recommended band of gease Refe to "7. Lubication of Beaings, 1 Gease lubication" in the Technical Data section. Recommended gease fill 1% of the capacity shown in the dimension tables Recommended gease packing method Refe to "6. Handling of Beaings, 1 Cleaning and filling with gease" in the Technical Data section. Ai-oil lubication Recommended location of nozzle Refe to "7. Lubication of Beaings, 2 Ai-oil lubication" in the Technical Data section. Recommended specifications of nozzle Nozzle boe diamete.: Fom 1 to 1.5 mm Numbe of nozzles: One nozzle fo each beaing, depth of nozzle boe should be fou to six times the nozzle diamete. Recommended specifications of ai-oil Oil type: Spindle oil Viscosity gade: ISO VG fom 1 to 32 (32 is pefeable) Table. 1.9 Ai and oil amount Beaing type NN3 NN3HS N1HS N1HSRT6 NN3HST6 NN3HSRT6 N1HSL dmn value (1 6 ) Ove Incl Recommended ai consumption NR/min Oil amount pe shot cm 3 Lubication inteval min NR/min (Nomal lite/minute)... NR means the volume of ai at C and 1 atmosphee Oil consumption cm 3 /h

222 NTN Main Spindle Beaings 9 Ulta high speed double ow cylindical olle beaings NN3HSRT6 type NN3HSRT6 ulta high speed double ow cylindical olle beaings have highe opeating speed with the same level of igidity and capacity as the conventional seies. Beaing design Featues 1. Optimized intenal design to ealize high speed and low tempeatue ise. 2. Molded PEEK cage is used fo high speed unde gease & ai-oil lubication and gease life. Fig. 1.4 NN3HSRT6 type Pemissible speed ange dmn value NN3HSRT6 Gease lubication Ai-oil lubication Notes) Pemissible speed of each beaing (dmn value) vaies depending on the specifications of the machine fo which the beaing is used (moto dive system, cooling system, and constuction aound the beaing). Conside the optimal choice efeing to the above guideline and contact NTN. Cage design Cage is made of PEEK which is vey light and stong. (Photo 1.1) Smalle defomation by the centifugal foce is ealized by the lighten cage mateial and unpoved design High speed opeation is by the cage design impovement. Gease life is extended by gease pocket in the cage. Photo 1.1 PEEK cage 218

223 NTN Main Spindle Beaings High speed test dmn value of 1. million unde gease lubication and 1.75 million unde ai-oil lubication ae ealized by the optimized intenal design. (Fig 1.5, 1.6) Test conditions Beaing Speed Mounted adial cleaance Lubication Gease type Jacket cooling NN32HSRT6K NN32HST6K NN32HSK (11537) 8 min -1 5 m Gease lubication MP-1 Yes Test conditions Beaing Speed Mounted adial cleaance Lubication Oil Ai Jacket cooling NN32HSRT6K NN32HST6K NN32HSK (11537) 15 min -1 m Ai- Oil lubication.2 ml/1shot Oil shot inteval: 2min 3 NL/min Yes OR tempeatue ise C NN32HSRT6K NN32HST6K NN32HSK OR tempeatue ise C NN32HSRT6K NN32HST6K NN32HSK Speedmin Speedmin dmn value dmn value 1 6 Fig. 1.5 Compaison of tempeatue ise (gease) Fig. 1.6 Compaison of tempeatue ise (ai- oil) Gease life Ove 85 hous continuous opeation unde gease lubication is ealized by the impoved cage design at dmn value of 1. million. (Fig. 1.7) Test conditions 15h Duation, h ove 138h Moe than 9 times Beaing Speed Mounted adial cleaance Lubication Gease type Jacket cooling NN32HSRT6K NN32HSK (11537) 8 min -1 5 m Gease lubication MP-1 Yes Fig. 1.7 Compaison of gease life 219

224 NTN Main Spindle Beaings! Ulta high-speed single ow cylindical olle beaings N1HSRT6 type N1HSRT6 type cylindical olle beaings have been designed fo high-speed opeation. Beaing specification Featues 1. Optimized intenal design allows high speed opeation and limits tempeatue incease. 2. Special esin cage is suitable fo high-speed opeation. Fig. 1.8 N1HSRT6 type Pemissible speed ange dmn value N1HSRT6 Gease lubication Ai-oil lubication Notes) Pemissible speed of each beaing (dmn value) vaies depending on the specifications of the machine fo which the beaing is used (moto dive system, cooling system, and constuction aound the beaing). Conside the optimal choice efeing to the above guideline and contact NTN. Simplified main spindle configuation / adoption of simplified lubication system Due to an optimized intenal stuctue, the N1HSR type beaings can eliably un at a highe speed with gease lubication. The gease lubication system geatly contibutes to eduction in pollution of the suounding envionments by vitually eliminating oil mist (Fig. 1.9). Simplified main spindle configuation / simplified main spindle ea stuctue N1HSR (N1HSL) type high-speed cylindical olle beaings can eplace angula contact ball beaing on the ea side of the main spindle. This aangement deceases the numbe of beaing ows (two ows to one ow) and eliminates the ball slide mechanism, geatly contibuting to simplification of the ea stuctue (Fig. 1.1). Ai-oil lubication Gease lubication w/ ball slide mechanism w/o ball slide mechanism Capable of eplacing ai-oil lubicated beaings up to dmn value of 1,15,. Fig. 1.9 Modification of lubication system Capable of eplacing angula contact ball beaings up to dmn value of 2,3, [ai-oil lubication] o 1,15, [gease lubication]. Fig. 1.1 Simplified main spindle ea stuctue 22

225 NTN Main Spindle Beaings High-speed opeation test with gease lubication Due to an optimized intenal design, the N1HSR type is capable of high-speed opeation with dmn value of 1.15 million [gease lubication] o 2.3 million [ai-oil lubication] (Figs. 1.11, 1.12, 1.13, 1.14). Test conditions Test beaing Shaft speed Mounted adial cleaance Lubication Jacket cooling N111HSRT6 N111HS (55918) 16 min -1 m Gease No Test conditions Test beaing Shaft speed Mounted adial cleaance Lubication Jacket cooling N111HSRT6 N111HS (55918) 16 min -1 m Gease Yes Tempeatue incease of oute ing C Speedmin dmn value 1 6 Tempeatue incease of oute ing C Speedmin dmn value 1 6 Fig High-speed test esults (gease lubication without oute case cooling) Fig High-speed test esults (gease lubication with oute case cooling) Test conditions Test beaing Shaft speed Mounted adial cleaance Lubication Oil consumption Ai consumption Jacket cooling N116HSRT6 N116HS (812522) 22 min -1 m Ai-oil lubication.2 ml/shot (oil shot intevals, 5 min) 4 NL/min No Test conditions Test beaing Shaft speed Mounted adial cleaance Lubication Oil consumption Ai consumption Jacket cooling N116HSRT6 N116HS (812522) 22 min -1 m Ai-oil lubication.2 ml/shot (oil shot intevals, 5 min) 4 NL/min Yes Tempeatue incease of oute ing C Tempeatue incease of oute ing C Speedmin dmn value Speedmin dmn value 1 6 Fig High-speed test esults (ai-oil lubication without jacket cooling) Fig High-speed test esults (ai-oil lubication with jacket cooling) 221

226 NTN Main Spindle Beaings!1 Eco-fiendly ai-oil lubicated cylindical olle beaings N1HSLT6 type The eco-fiendly ai-oil lubicated N1HSLT6 type was developed by applying NTN's unique ecoconscious technology to the poven N1HSRT6 type beaing design. The N1HSLT6 type boasts limited emission of oil mist and educed ai and oil consumption. This impoves opeating envionments, saves enegy while allowing highe-speed machining opeation. Beaing specification Ai-oil Ai-oil Eco-fiendly nozzle Intenal specification of N1HSRT6 type Eco-fiendly specification Featues 1. Optimized intenal design allows high speed opeation and limits tempeatue incease. 2. Adoption of the eco-fiendly nozzle design has led to: Lowe noise level (up to 7 dba) 5% eduction in ai consumption 5% eduction in oil consumption. N1HS type (conventional beaing type) ULTAGE N1HSLT6 type NOTE) The N1HSLT6 type is deliveed as packed togethe with the space with the eco-fiendly nozzle. The beaing type code N1HSLT6 epesents the beaing pope, while a space code stands fo an eco-fiendly nozzle pope o a space having a built-in nozzle. Fo moe details, see 3 Beaing Designations. Fig N1HSLT6 type Pemissible speed ange dmn value N1HSLT6 Notes) Pemissible speed of each beaing (dmn value) vaies depending on the specifications of the machine fo which the beaing is used (moto dive system, cooling system, and constuction aound the beaing). Conside the optimal choice efeing to the above guideline and contact NTN. High-speed unning test Even with deceased ai consumption and oil consumption, the N1HSL type beaings can eliably opeate at high speed of dmn (Fig. 1.16, 1.17). Test conditions Test beaing Shaft speed Mounted adial cleaance Oil consumption Ai consumption Jacket cooling N116HSLT6 N116HS (812522) 22 min -1 m.2 ml/shot N116HS N116HSL N116HS N116HSL No 5 min intevals 1 min intevals 4 NL/min 2 NL/min Test conditions Test beaing Shaft speed Mounted adial cleaance Oil consumption Ai consumption Jacket cooling N116HSLT6 N116HS (812522) 23 min -1 m.2 ml/shot N116HS N116HSL N116HS N116HSL Yes 5 min intevals 1 min intevals 4 NL/min 2 NL/min Tempeatue incease of oute ing C Tempeatue incease of oute ing C Shaft speedmin dmn value1 6 Fig Hgh-speed test esults (without Jacket cooling) Shaft speedmin dmn value1 6 Fig High-speed test esults (with Jacket cooling)

227 NTN Main Spindle Beaings 223

228 Main Spindle Beaings!2 Dimension tables fo double ow cylindical olle beaings Double ow cylindical olle beaings d 25 95mm B B D d FW d D Ew d d NNU Type Cylindical boe Tapeed boe NN Type Cylindical boe Tapeed boe Pat numbe Bounday Basic load atings Limiting speeds dimensions dynamic static dynamic static NNU Type NN Type mm kn kgf min -1 cylindical tapeed cylindical tapeed gease oil boe boe 1 boe boe 1 d D B s min 2 C Co C Co lubication lubication NN35 NN35K NN35HS NN35HSK NN36 NN36K NN36HS NN36HSK NN37 NN37K NN37HS NN37HSK NN38 NN38K NN38HS NN38HSK NN39 NN39K NN39HS NN39HSK NN31 NN31K NN31HS NN31HSK NN311 NN311K NN311HS NN311HSK NN312 NN312K NN312HS NN312HSK NN313 NN313K NN313HST6 NN313HST6K NN313HSRT6 NN313HSRT6K NN314 NN314K NN314HST6 NN314HST6K NN314HSRT6 NN314HSRT6K NN315 NN315K NN315HST6 NN315HST6K NN315HSRT6 NN315HSRT6K NN316 NN316K NN316HST6 NN316HST6K NN316HSRT6 NN316HSRT6K NN317 NN317K NN317HST6 NN317HST6K NN317HSRT6 NN317HSRT6K NN318 NN318K NN318HST6 NN318HST6K NN318HSRT6 NN318HSRT6K NN319 NN319K A beaing numbe with suffix K indicates a tapeed-boe beaing (tape atio 1/12). 2 Minimum allowable value fo cone adius dimension. 224

229 Main Spindle Beaings a a a a a Da dc da dd Db da Db Db da db Dynamic equivalent adial load P=F Static equivalent adial load Po=F Dimensions Abutment and fillet dimensions Mass Intenal kg (appox.) fee space mm mm NNU Type NN Type cm 3 da db dc dd Da Db as cylindical tapeed cylindical tapeed NN Fw Ew min min max min max max min max boe boe boe boe Type

230 Main Spindle Beaings Double ow cylindical olle beaings d 1 19mm B B D d FW d D Ew d d NNU Type Cylindical boe Tapeed boe NN Type Cylindical boe Tapeed boe Pat numbe Bounday Basic load atings Limiting speeds dimensions dynamic static dynamic static NNU Type NN Type mm kn kgf min -1 cylindical tapeed cylindical tapeed gease oil boe boe 1 boe boe 1 d D B s min 2 C Co C Co lubication lubication NNU492 NNU492K NN492 NN492K NN32 NN32K NN32HST6 NN32HST6K NN32HSRT6 NN32HSRT6K NNU4921 NNU4921K NN4921 NN4921K NN321 NN321K NN321HST6 NN321HST6K NN321HSRT6 NN321HSRT6K NNU4922 NNU4922K NN4922 NN4922K NN322 NN322K NN322HST6 NN322HST6K NN322HSRT6 NN322HSRT6K NNU4924 NNU4924K NN4924 NN4924K NN324 NN324K NN324HST6 NN324HST6K NN324HSRT6 NN324HSRT6K NNU4926 NNU4926K NN4926 NN4926K NN326 NN326K NN326HST6 NN326HST6K NN326HSRT6 NN326HSRT6K NNU4928 NNU4928K NN4928 NN4928K NN328 NN328K NN328HST6 NN328HST6K NNU493 NNU493K NN493 NN493K NN33 NN33K NN33HS NN33HSK NNU4932 NNU4932K NN4932 NN4932K NN332 NN332K NN332HS NN332HSK NNU4934 NNU4934K NN4934 NN4934K NN334 NN334K NNU4936 NNU4936K NN4936 NN4936K NN336 NN336K NNU4938 NNU4938K NN4938 NN4938K NN338 NN338K A beaing numbe with suffix K indicates a tapeed-boe beaing (tape atio 1/12). 2 Minimum allowable value fo cone adius dimension. 226

231 Main Spindle Beaings a a a a a Da dc da dd Db da Db Db da db Dynamic equivalent adial load P=F Static equivalent adial load Po=F Dimensions Abutment and fillet dimensions Mass Intenal kg (appox.) fee space mm mm NNU Type NN Type cm 3 da db dc dd Da Db as cylindical tapeed cylindical tapeed NN Fw Ew min min max min max max min max boe boe boe boe Type

232 Main Spindle Beaings Double ow cylindical olle beaings d 2 5mm B B D d FW d D Ew d d NNU Type Cylindical boe Tapeed boe NN Type Cylindical boe Tapeed boe Pat numbe Bounday Basic load atings Limiting speeds dimensions dynamic static dynamic static NNU Type NN Type mm kn kgf min -1 cylindical tapeed cylindical tapeed gease oil boe boe 1 boe boe 1 d D B s min 2 C Co C Co lubication lubication NNU494 NNU494K NN494 NN494K NN34 NN34K NNU4944 NNU4944K NN4944 NN4944K NN344 NN344K NNU4948 NNU4948K NN4948 NN4948K NN348 NN348K NNU4952 NNU4952K NN4952 NN4952K NN352 NN352K NNU4956 NNU4956K NN4956 NN4956K NN356 NN356K NNU496 NNU496K NN496 NN496K NN36 NN36K NNU4964 NNU4964K NN4964 NN4964K NN364 NN364K NNU4968 NNU4968K NN368 NN368K NNU4972 NNU4972K NN372 NN372K NNU4976 NNU4976K NN376 NN376K NNU498 NNU498K NN38 NN38K NNU4984 NNU4984K NN384 NN384K NNU4988 NNU4988K NN388 NN388K NNU4992 NNU4992K NN392 NN392K NNU4996 NNU4996K NNU49/5 NNU49/5K A beaing numbe with suffix K indicates a tapeed-boe beaing (tape atio 1/12). 2 Minimum allowable value fo cone adius dimension. 228

233 Main Spindle Beaings a a a a a Da dc da dd Db da Db Db da db Dynamic equivalent adial load P=F Static equivalent adial load Po=F Dimensions Abutment and fillet dimensions Mass Intenal kg (appox.) fee space mm mm NNU Type NN Type cm 3 da db dc dd Da Db as cylindical tapeed cylindical tapeed NN Fw Ew min min max min max max min max boe boe boe boe Type

234 Main Spindle Beaings High speed single ow cylindical olle beaings d 3 8mm B 1 B 1 Ew d D Ew d D Cylindical boe Tapeed boe Pat numbe 1 3 Bounday dimensions Basic load atings Limiting speeds dynamic static dynamic static kn kgf min -1 cylindical tapeed gease oil boe boe d D B s min 2 1s min 2 Ew C Co C Co lubication lubication N16HS N16HSK N17HS N17HSK N18HS N18HSK N19HS N19HSK N11HS N11HSK N111HS N111HSK N112HS N112HSK N113HS N113HSK N114HS N114HSK N115HS N115HSK N116HS N116HSK A beaing numbe with suffix K indicates a tapeed-boe beaing (tape atio 1/12). 2 Minimum allowable value fo chamfe dimension o 1. 3 N1HS diffes fom standad N1 in intenal constuction. 23

235 Main Spindle Beaings 1a a Db da Db Dynamic equivalent adial load P=F Static equivalent adial load Po=F Abutment and Mass Intenal Pat numbe fillet dimensions cylindical fee space mm boe cm 3 da Db as 1as kg cylindical tapeed min max min max max (appox.) boe boe N16HS N16HSK N17HS N17HSK N18HS N18HSK N19HS N19HSK N11HS N11HSK N111HS N111HSK N112HS N112HSK N113HS N113HSK N114HS N114HSK N115HS N115HSK N116HS N116HSK 231

236 Main Spindle Beaings High speed single ow cylindical olle beaings d 85 16mm B 1 B 1 Ew d D Ew d D Cylindical boe Tapeed boe Pat numbe 1 3 Bounday dimensions Basic load atings Limiting speeds dynamic static dynamic static kn kgf min -1 cylindical tapeed gease oil boe boe d D B s min 2 1s min 2 Ew C Co C Co lubication lubication N117HS N117HSK N118HS N118HSK N119HS N119HSK N12HS N12HSK N121HS N121HSK N122HS N122HSK N124HS N124HSK N126HS N126HSK N128HS N128HSK N13HS N13HSK N132HS N132HSK A beaing numbe with suffix K indicates a tapeed-boe beaing (tape atio 1/12). 2 Minimum allowable value fo chamfe dimension o 1. 3 N1HS diffes fom standad N1 in intenal constuction. 232

237 Main Spindle Beaings 1a a Db da Db Dynamic equivalent adial load P=F Static equivalent adial load Po=F Abutment and Mass Intenal Pat numbe fillet dimensions cylindical fee space mm boe cm 3 da Db as 1as kg cylindical tapeed min max min max max (appox.) boe boe N117HS N117HSK N118HS N118HSK N119HS N119HSK N12HS N12HSK N121HS N121HSK N122HS N122HSK N124HS N124HSK N126HS N126HSK N128HS N128HSK N13HS N13HSK N132HS N132HSK 233

238 Main Spindle Beaings Ulta high-speed single ow cylindical olle beaings (ULTAGE seies) d 55 1mm B 1 B 1 Ew d D Ew d D Cylindical boe Tapeed boe Pat numbe 1 3 Bounday dimensions Basic load atings Limiting speeds dynamic static dynamic static kn kgf min -1 cylindical tapeed gease oil boe boe d D B s min 2 1s min 2 Ew C Co C Co lubication lubication N111HSRT6 N111HSRT6K N112HSRT6 N112HSRT6K N113HSRT6 N113HSRT6K N114HSRT6 N114HSRT6K N116HSRT6 N116HSRT6K N118HSRT6 N118HSRT6K N12HSRT6 N12HSRT6K Minimum allowable value fo chamfe dimension o

239 Main Spindle Beaings 1a a da Db Dynamic equivalent adial load P=F Static equivalent adial load Po=F Abutment and Intenal Pat numbe fillet dimensions fee space mm cm 3 da Db as 1as cylindical tapeed min max min max max boe boe N111HSRT6 N111HSRT6K N112HSRT6 N112HSRT6K N113HSRT6 N113HSRT6K N114HSRT6 N114HSRT6K N116HSRT6 N116HSRT6K N118HSRT6 N118HSRT6K N12HSRT6 N12HSRT6K 235

240 Main Spindle Beaings Eco-fiendly ulta high-speed single ow cylindical olle beaings (ULTAGE seies) Ai-oil lubication only d 55 1mm B 1 B 1 Ew d D Ew d D Cylindical boe Tapeed boe Pat numbe Bounday dimensions Basic load atings Limiting speeds dynamic static dynamic static kn kgf min -1 cylindical tapeed gease boe boe d D B s min 1 1s min 1 Ew C Co C Co lubication N111HSLT6 N111HSLT6K N112HSLT6 N112HSLT6K N113HSLT6 N113HSLT6K N114HSLT6 N114HSLT6K N116HSLT6 N116HSLT6K N118HSLT6 N118HSLT6K N12HSLT6 N12HSLT6K Minimum allowable value fo chamfe dimension o 1. 2 Fo the details of space dimensions, please contact NTN Engineeing. 236

241 Main Spindle Beaings 1a a da Db Dynamic equivalent adial load P=F Static equivalent adial load Po=F Abutment and Pat numbe fillet dimensions mm da Db as 1as 2 cylindical tapeed min max min max max min boe boe N111HSLT6 N111HSLT6K N112HSLT6 N112HSLT6K N113HSLT6 N113HSLT6K N114HSLT6 N114HSLT6K N116HSLT6 N116HSLT6K N118HSLT6 N118HSLT6K N12HSLT6 N12HSLT6K 237

242 Main Spindle Beaings!3Tape gage and intenal cleaance adjustment gage fo NTN pecision cylindical olle beaings As the need inceases fo machine tools of highe speed and pecision, a highe degee of pecision is equied of machine tool beaings. Fo a pecision beaing to exhibit its full pefomance, it must be installed coectly. In paticula, when a tapeed boe beaing is used, the coesponding tape on the shaft must be finished to a high degee of pecision. NTN ecommends the ing gage fo the tapeed shaft be finished to the same pecision as fo beaings. Note that the contact aea between tapeed faces should be 8% o geate. NTN also offes a plug gage that pemits veification of the pecision of the ing gage. Remembe that the adial intenal cleaance of a cylindical olle beaing needs to be coectly adjusted. Too lage a adial cleaance can diminish the pecision of the main spindle, while too small a adial cleaance can lead to abnomal heat geneation and pematue flaking of the beaing. To ensue adequate intenal cleaance, use a mounted intenal cleaance adjustment gage.!4dimension table fo tape gage Pat numbe Applicable beaing Bounday dimensions Mass (appox.) mm kg type type Plug gage Ring gage d d1 D B TB TA TANN36K TBNN36K N16HS NN36K TANN37K TBNN37K N17HS NN37K TANN38K TBNN38K N18HS NN38K TANN39K TBNN39K N19HS NN39K TANN31K TBNN31K N11HS NN31K TANN311K TBNN311K N111HS NN311K TANN312K TBNN312K N112HS NN312K TANN313K TBNN313K N113HS NN313K TANN314K TBNN314K N114HS NN314K TANN315K TBNN315K N115HS NN315K TANN316K TBNN316K N116HS NN316K TANN317K TBNN317K N117HS NN317K TANN318K TBNN318K N118HS NN318K TANN319K TBNN319K N119HS NN319K TANN32K TBNN32K N12HS NN32K TANN321K TBNN321K N121HS NN321K TANN322K TBNN322K N122HS NN322K TANN324K TBNN324K N124HS NN324K TANN326K TBNN326K N126HS NN326K TANN328K TBNN328K N128HS NN328K TANN33K TBNN33K N13HS NN33K TANN332K TBNN332K N132HS NN332K d1 B d Tape 1/12 Plug gage (TA) B Tape 1/12 D d d1 Ring gage (TB) 238

243 Main Spindle Beaings!5Dimension table fo mounted intenal cleaance adjustment gage Pat Applicable beaing Bounday numbe dimensions mm E D width B SBNN37-2 N17HSK NN37K SBNN38-2 N18HSK NN38K SBNN39-2 N19HSK NN39K SBNN31-2 N11HSK NN31K SBNN311-2 N111HSK NN311K SBNN312-2 N112HSK NN312K SBNN313-2 N113HSK NN313K SBNN314-2 N114HSK NN314K SBNN315-2 N115HSK NN315K SBNN316-2 N116HSK NN316K SBNN317-2 N117HSK NN317K SBNN318-2 N118HSK NN318K SBNN319-2 N119HSK NN319K SBNN32-2 N12HSK NN32K SBNN321-2 N121HSK NN321K SBNN322-2 N122HSK NN322K SBNN324-2 N124HSK NN324K SBNN326-2 N126HSK NN326K SBNN328-2 N128HSK NN328K SBNN33-2 N13HSK NN33K SBNN332-2 N132HSK NN332K

244 NTN Main Spindle Beaings

245 NTN Main Spindle Beaings Main Spindle Beaings 11. Angula Contact Ball Beaings fo Axial Loads CONTENTS 11. Angula Contact Ball Beaings fo Axial Loads q Featues and types 242 w Standad cage types 243 e Beaing designations 243 Accuacy of double-diection angula contact thust ball beaings 244 t Accuacy of high-speed duplex angula contact ball beaings fo axial loads 245 y Basic peload 246 u Shaft and housing fits 247 i Recommended lubication specifications 247 o Angula contact ball beaings fo axial loads HTA U type 248! Dimension tables Double-diection angula contact thust ball beaings 25 Angula contact ball beaings fo axial loads

246 NTN Main Spindle Beaings 11. Angula Contact Ball Beaings fo Axial Loads 1 Featues and types NTN povides a ange of thust beaings fo the main spindles. This includes 5629 and 562 seies fo high axial igidity (contact angle 6 ) and HTA U(A) seies high-speed duplex angula contact ball beaings fo axial loads with optimized intenal design (contact angle 4, 3 ). These beaings ae used in conjunction with NN3, NN49, o NNU49 seies double-ow cylindical olle beaings (matched beaings must have the same boe and outside diamete). Table 11.1 Types of angula contact ball beaings fo axial loads 5629 and 562 seies HTAU (A)..DB, HTA9U (A)..DB seies Beaing type Initial contact angle 6 43 Cage mateial Featues High-stength machined bass cage These seies can withstand axial loads in both diections. Due to a lage contact angle, igidity in axial diections is enhanced. The stuctue of these beaings limits them to gease-lubicated vetical shaft applications. Molded esin, machined phenolic, high-stength machined coppe alloy cage These duplex angula contact ball beaing seies have simila design to the double-ow thust angula contact ball beaing seies, but ae diffeent in tems of thei widths (see the diagams below). Since thei contact angles ae lowe at 4 and 3, the seies boast highspeed capability. Howeve, thei axial igidity is less than double-ow thust angula contact ball beaings with 6 contact angle. A double-diection thust angula contact ball beaing can be eadily intechanged with a duplex angula contact ball beaing simply by eplacing space C with space D; the dimensions of the shaft and housing emain unchanged. A Space C Dimension A = Dimension 2B 2B Space D Intechangeability Double-diection thust angula contact ball beaing 5629 seies 562 seies High-speed duplex angula contact ball beaing fo axial loads HTA9UDB seies HTBUDB seies 242

247 NTN Main Spindle Beaings 2 Standad cage types Table 11.2 Standad cage of angula contact ball beaing fo axial loads Beaing seies HTA9U (A) HTAU (A) Machined phenol cage HTA92HTA938U HTA7HTA38U Machined bass cage HTA94UHTA964U HTA4UHTA64U Notes: Cage types may be subjected to change without notice. Fo details, contact NTN Engineeing. 3 Beaing designations 562 2M / GN P4 Toleance class code P5: NTN Class 5 P4: NTN Class 4 Intenal cleaance code GN: Nomal peload GM: Medium peload Boe code (efe to the dimensions tables) without M: Tapeed shaft small side diamete type (Ex.: mm boe) with M: Tapeed shaft lage side diamete type (Ex.: mm boe) Dimension seies code Beaing type 5S - HTA 2 U A T2 DB / GN P4L Toleance class code P5: JIS Class 5 P4: JIS Class 4 L: Oute ing outside diamete toleance fo axial load Intenal cleaance code GN: Nomal peload GM: Medium peload Duplex aangement code DB: back-to-back (double-ow) DTBT: tandem back-to-back (fou-ow) Cage code No code: Standad cage T2: Molded esin L1: Machined bass cage Contact angle code No code: 4 A: 3 Beaing seies: ULTAGE Nominal boe diamete (see the dimensions tables) Dimension seies code Beaing type Mateial code 5S: Mateial of olling element is ceamics No code: Beaing steel 243

248 NTN Main Spindle Beaings 4 Accuacy of double-diection angula contact thust ball beaings Table 11.3 Inne ings Nominal boe diamete d ove incl Single plane mean boe diamete deviation Δdmp o boe diamete deviation Δds Class 5 Class 4 high low high low Pependiculaity of inne ing face with espect to the boe Sd Class 5 Class 4 max Axial unout Sia Class 5 Class 4 max Width vaiation VBs Class 5 Class 4 Class 5 Class 4 max high low Unit: Beaing height deviation ΔTs Table 11.4 Oute ings Nominal boe diamete D ove incl Single plane mean outside diamete deviation ΔDmp o outside diamete deviation ΔDs Class 5 Class 4 high low Pependiculaity of oute ing outside suface with espect to the face SD Class 5 Class 4 max Axial unout Sea Class 5 Class 4 max Identical to ΔBs elative to d of the same beaing. Unit: Width vaiation VCs Class 5 Class 4 max

249 NTN Main Spindle Beaings 5 Accuacy of high-speed duplex angula contact ball beaings fo axial loads Table 11.5 Inne ings Nominal boe diamete d ove incl Oveall width vaiation of assembled beaing ΔBs Class 5 Class 4 high low Single plane mean boe diamete deviation Δdmp Class 5 Class 4 1 high low high low Width vaiation VBs Class 5 Class 4 max Unit: Nominal boe diamete d ove incl. Single adial plane boe diamete vaiation Vdsp Diamete seies 9 Diamete seies Class 5 Class 4 Class 5 Class 4 max max Mean boe Pependiculaity of diamete deviation inne ing face with Vdmp espect to the boe Sd Class 5 Class 4 Class 5 Class 4 max max Unit: Axial unout Sia Class 5 Class 4 max The toleance of boe diamete deviation Δds is the same as the toleance of single plane mean boe diamete deviation Δdmp Table 11.6 Oute ings Nominal boe diamete D Single plane mean outside diamete deviation ΔDmp and outside diamete deviation ΔDs Class 5L o Class 4L 2 Class 5 ove incl. high low high low Class 4 2 high low Axial unout Sea Class 5 Class 4 All classes Oveall width vaiation of assembled beaing ΔCs All classes Unit: Width vaiation VCs Class 5 Class 4 max Identical to Bs elative to d on the same beaing The toleance of outside diamete deviation ΔDs to be applied to the Class 4 and Class 2 is same as the toleance of the mean outside diamete deviation Δdmp. Note that the Class 4 is applicable to diamete seies and 2, and the Class 2 is applicable to all the diamete seies. Note: This standad is the NTN standad. 245

250 NTN Main Spindle Beaings 6 Basic peload The initial intenal cleaance o initial peload must be selected with consideation of the lubicating method, maximum speed, and equied axial igidity. Although usage with nomal peload (GN) within the allowable speed ange is possible fo both gease lubication and ai-oil lubication, ask NTN Engineeing to ecommend the appopiate peload if axial igidity is equied and you want to inhibit tempeatue ise of the main spindle. The standad peloads ae summaized in Table Table 11.7 Basic peload Unit: Boe numbe Nomal GN Medium GM Nomal GN 562 HTA9UDB HTA9UADB HTAUDB HTAUADB Medium GM Nomal GN Medium GM Nomal GN Medium GM Nomal GN Medium GM Nomal GN Medium GM Boe numbe

251 NTN Main Spindle Beaings 7 Shaft and housing fits Fits given in Table 11.8 ae ecommended fo angula contact ball beaings fo axial loads. To maintain high accuacy, povision of intefeence between the shaft and the boe of inne ing is essential. The fit of the housing and beaing should be same as that fo cylindical olle beaings, since an angula contact ball beaing is nomally used togethe with a cylindical olle beaing. Checking concenticity of outside diamete of oute ing afte beaing Contolling concenticity of oute ing assembly is necessay fo eduction of axial unout of the main spindle. Measue and contol the concenticity of oute ing shown in Fig and "6. Handling of Beaings, 2 Mounting" in the Technical Data section. Measuement of concenticity of oute ing Fig Concenticity Table 11.8 Fit to shaft Nominal boe diamete d ove incl Fit of inne ing to shaft 2T 2T 2.5T 3T 3.5T 4T 5T 6T Unit: Note 1: Taget the median value. 2: Fo high-speed applications whee dmn value exceeds , the fit should be inceased.fo such an aangement, consult NTN Engineeing. T: Tight (Intefeence) fit 8 Recommended lubication specifications Angula contact ball beaings fo axial loads ae usually used with gease lubication o ai-oil lubication. Recommended specifications of the lubication methods ae descibed below. Gease lubication Recommended band of gease Refe to "7. Lubication of Beaings, 1 Gease lubication" in the Technical Data section. Recommended gease filling amount dmn value % of the capacity shown in the dimensions tables dmn value > % of the capacity shown in the dimensions tables Recommended gease filling method Refe to "6. Handling of Beaings, 1 Cleaning and filling with gease" in the Technical Data section. Notes: High-stength machined bass cages ae used fo 5629/562 seies. Thus, if they ae used fo gease-lubicated vetical shafts, the cage on one side may hang onto the olling elements, possibly causing seizue. Use of the HTA seies with esin cages o oil lubication (including feeding of lubicating oil) is ecommended. Ai-oil lubication Recommended location of nozzle Refe to "7. Lubication of Beaings 2 Recommended location of nozzle fo ai-oil lubication" in the Technical Data section. Recommended specifications of nozzle Nozzle boe diamete : Fom 1 to 1.5 mm Numbe of nozzles: One nozzle fo each beaing, depth of nozzle boe should be fou to six times of nozzle boe diamete. Recommended specifications of ai-oil Oil type: Spindle oil Viscosity gade: ISO VG fom 1 to 32 (32 is pefeable) Table Ai and oil amount Beaing types HTA9 (A) HTA (A) 5S-HTA (A) dmn value 1 6 Ove Incl Oil amount Lubication Oil Recommended pe shot intevalsconsumption ai consumption ml min ml/h NL/min NL/min (Nomal lite/minute) NL means the volume of ai at C and 1 atmosphee. 247

252 NTN Main Spindle Beaings 9 Angula contact ball beaings fo axial loads HTA U type HTA U type angula contact ball beaing has a highe limiting speed with the same igidity and loading capability as the conventional HTA seies. Beaings design Featues 1. Optimized intenal design to minimize the tempeatue ise especially at high speed ange. 2. Impoved molded nylon cage pocket design whee the ball contacts to have highe lubication pefomance unde gease o ai-oil lubication. Fig HTA U type Pemissible speed ange dmn value HTA9 U HTA U Gease lubication Ai-oil lubication 5S-HTA U Notes) Pemissible speed of each beaing (dmn value) vaies depending on the specifications of the machine fo which the beaing is used (moto dive system, cooling system, and constuction aound the beaing). Conside the optimal choice efeing to the above guideline and contact NTN. Axial igidity Axial igidity is at the same level as the conventional design. Data/Allowable axial load By eviewing the intenal stuctue, the allowable axial load has impoved ove HTA types by about 1.3 times with the contact angle of 3 and by about 1.2 times with the contact angle of 4. Axial displacementm Condition fo study HTA2UADBHTA2ADB Beaing HTA2UDBHTA2DB ( ow) [:3 ] 88 N Mounted peload [:4 ] 147 N HTA U type HTA type Axial loadkn Pemissible axial loadkn Condition fo study HTA2UADBHTA2ADB Beaing HTA2UDBHTA2DB ( ow) HTA U type HTA type Fig Compaison of pemissible axial load Fig Axial load and igidity 248

253 NTN Main Spindle Beaings High speed test dmn value of 1. million unde gease lubication and 1.25 million unde ai-oil lubication ae ealized by the optimized intenal design. (Fig ) Test condition Beaing[:3 ] Speed Mounted peload Lubication Gease type Jacket coating 4 HTA2UADB HTA2ADB ( ows) 8 min N Gease MP-1 w/, w/o Test condition HTA2UADB Beaing[:3 ] HTA2ADB ( ows) Speed 1 min -1 Mounted peload 88 N Lubication Ai- oil Oil.3 ml/1shot Oil shot inteval 5 min Ai 4 NL/min Jacket cooling w/, w/o 4 OR tempeatue ise HTA2UA w/o jacket cooling HTA2UA w/ jacket cooling HTA2A w/o jacket cooling HTA2A w/ jacket cooling OR tempeatue ise HTA2UA w/o jacket cooling HTA2UA w/ jacket cooling HTA2A w/o jacket cooling HTA2A w/ jacket cooling Speedmin Speedmin dmn value 1 6 Fig Compaison of tempeatue ise (Gease, 3 ) dmn value 1 6 Fig Compaison of tempeatue ise (Ai-oil, 3 ) Test condition HTA2UDB Beaing[:4 ] HTA2DB ( ows) Speed 6 min -1 Mounted peload 147 N Lubication Gease Gease type MP-1 Jacket coating w/, w/o Test condition HTA2UDB Beaing[:4 ] HTA2DB ( ows) Speed 75 min -1 Mounted peload 147 N Lubication Ai- oil Oil.3 ml/1shot Oil shot inteval 5 min Ai 4 NL/min Jacket cooling w/, w/o 3 3 OR tempeatue ise HTA2U w/o jacket cooling HTA2U w/ jacket cooling HTA2 w/o jacket cooling HTA2 w/ jacket cooling OR tempeatue ise HTA2U w/o jacket cooling HTA2U w/ jacket cooling HTA2 w/o jacket cooling HTA2 w/ jacket cooling Speedmin Speedmin dmn value 1 6 Fig Compaison of tempeatue ise (Gease, 4 ) dmn value 1 6 Fig Compaison of tempeatue ise (Ai-oil, 4 ) 249

254 Main Spindle Beaings! Dimension tables fo angula contact ball beaings Double-diection angula contact thust ball beaings 5629 seies Contact angle 6 d 1 32mm T1 C 1 J d EW D Pat numbe Bounday dimensions Basic load atings Limiting speed Mass dynamic static dynamic static (appox.) d mm kn kgf min -1 kg small lage small lage gease oil small lage size size size size D T1 C s min 1 1s min 1 Ca Coa Ca Coa lubication lubication size size M M M M M M M M M M M M M M M M M M Minimum allowable value fo cone adius dimension o 1. 2 Maximum cicumscibed cicle diamete of balls. 25

255 Main Spindle Beaings 1a a Wo 4-do Db da Dynamic equivalent axial load Pa=Fa Static equivalent axial load Poa=Fa Refeence Abutment and Pat numbe dimensions fillet dimensions mm mm da Db as 1as small lage J Ew 2 min max max max size size M M M M M M M M M M M M M M M M M M Dimensions of oil hole and oil goove unit: mm Nominal oute diamete D ove incl. Oil Oil goove hole width diamete Wo do

256 Main Spindle Beaings Double-diection angula contact thust ball beaings 562 seies Contact angle 6 d 25 32mm T1 C 1 J d EW D 252 Pat numbe Bounday dimensions Basic load atings Limiting speed Mass dynamic static dynamic static (appox.) d mm kn kgf min -1 kg small lage small lage gease oil small lage size size size size D T1 C s min 1 1s min 1 Ca Coa Ca Coa lubication lubication size size M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M Minimum allowable value fo cone adius dimension o 1. 2 Maximum cicumscibed cicle diamete of balls.

257 Main Spindle Beaings 1a a Wo 4-do Db da Dynamic equivalent axial load Pa=Fa Static equivalent axial load Poa=Fa Refeence Abutment and Pat numbe dimensions fillet dimensions mm mm da Db as 1as small lage J Ew 2 min max max max size size M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M Dimensions of oil hole and oil goove unit: mm Nominal oute diamete D ove incl. Oil Oil goove hole width diamete Wo do

258 Main Spindle Beaings Angula contact ball beaings fo axial loads (steel ball type) HTA9UA seies Contact angle 3 d 1 32mm 1 2B 1 D d d1 D2 2a Pat Bounday dimensions Basic load atings Static thust Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D 2B s min 1 1s min 1 Ca Coa Ca Coa lubication lubication HTA92UADB HTA921UADB HTA922UADB HTA924UADB HTA926UADB HTA928UADB HTA93UADB HTA932UADB HTA934UADB HTA936UADB HTA938UADB HTA94UADB HTA944UADB HTA948UADB HTA952UADB HTA956UADB HTA96UADB HTA964UADB Minimum allowable value fo cone adius dimension o

259 Main Spindle Beaings 1as as dadb Dynamic equivalent axial load Pa=Fa Static equivalent axial load Poa=Fa Load Intenal Mass Refeence Abutment and fillet dimensions Pat cente fee space dimensions numbe mm cm 3 kg mm mm Two ow Two ow da Db as 1as 2a (appox.) (appox.) d1 D2 min max max max HTA92UADB HTA921UADB HTA922UADB HTA924UADB HTA926UADB HTA928UADB HTA93UADB HTA932UADB HTA934UADB HTA936UADB HTA938UADB HTA94UADB HTA944UADB HTA948UADB HTA952UADB HTA956UADB HTA96UADB HTA964UADB 255

260 Main Spindle Beaings Angula contact ball beaings fo axial loads (steel ball type) HTA9U seies Contact angle 4 d 1 32mm 1 2B 1 D d d1 D2 2a Pat Bounday dimensions Basic load atings Static thust Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D 2B s min 1 1s min 1 Ca Coa Ca Coa lubication lubication HTA92UDB HTA921UDB HTA922UDB HTA924UDB HTA926UDB HTA928UDB HTA93UDB HTA932UDB HTA934UDB HTA936UDB HTA938UDB HTA94UDB HTA944UDB HTA948UDB HTA952UDB HTA956UDB HTA96UDB HTA964UDB Minimum allowable value fo cone adius dimension o

261 Main Spindle Beaings 1as as dadb Dynamic equivalent axial load Pa=Fa Static equivalent axial load Poa=Fa Load Intenal Mass Refeence Abutment and fillet dimensions Pat cente fee space dimensions numbe mm cm 3 kg mm mm Two ow Two ow da Db as 1as 2a (appox.) (appox.) d1 D2 min max max max HTA92UDB HTA921UDB HTA922UDB HTA924UDB HTA926UDB HTA928UDB HTA93UDB HTA932UDB HTA934UDB HTA936UDB HTA938UDB HTA94UDB HTA944UDB HTA948UDB HTA952UDB HTA956UDB HTA96UDB HTA964UDB 257

262 Main Spindle Beaings Angula contact ball beaings fo axial loads (steel ball type) HTAUA seies Contact angle 3 d 5 32mm 1 2B 1 D d d1 D2 2a Pat Bounday dimensions Basic load atings Static thust Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D 2B s min 1 1s min 1 Ca Coa Ca Coa lubication lubication HTA1UADB HTA11UADB HTA12UADB HTA13UADB HTA14UADB HTA15UADB HTA16UADB HTA17UADB HTA18UADB HTA19UADB HTA2UADB HTA21UADB HTA22UADB HTA24UADB HTA26UADB HTA28UADB HTA3UADB HTA32UADB HTA34UADB HTA36UADB HTA38UADB HTA4UADB HTA44UADB HTA48UADB HTA52UADB HTA56UADB HTA6UADB HTA64UADB Minimum allowable value fo cone adius dimension o

263 Main Spindle Beaings 1as as dadb Dynamic equivalent axial load Pa=Fa Static equivalent axial load Poa=Fa Load Intenal Mass Refeence Abutment and fillet dimensions Pat cente fee space dimensions numbe mm cm 3 kg mm mm Two ow Two ow da Db as 1as 2a (appox.) (appox.) d1 D2 min max max max HTA1UADB HTA11UADB HTA12UADB HTA13UADB HTA14UADB HTA15UADB HTA16UADB HTA17UADB HTA18UADB HTA19UADB HTA2UADB HTA21UADB HTA22UADB HTA24UADB HTA26UADB HTA28UADB HTA3UADB HTA32UADB HTA34UADB HTA36UADB HTA38UADB HTA4UADB HTA44UADB HTA48UADB HTA52UADB HTA56UADB HTA6UADB HTA64UADB 259

264 Main Spindle Beaings Angula contact ball beaings fo axial loads (steel ball type) HTAU seies Contact angle 4 d 5 32mm 1 2B 1 D d d1 D2 2a Pat Bounday dimensions Basic load atings Static thust Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D 2B s min 1 1s min 1 Ca Coa Ca Coa lubication lubication HTA1UDB HTA11UDB HTA12UDB HTA13UDB HTA14UDB HTA15UDB HTA16UDB HTA17UDB HTA18UDB HTA19UDB HTA2UDB HTA21UDB HTA22UDB HTA24UDB HTA26UDB HTA28UDB HTA3UDB HTA32UDB HTA34UDB HTA36UDB HTA38UDB HTA4UDB HTA44UDB HTA48UDB HTA52UDB HTA56UDB HTA6UDB HTA64UDB Minimum allowable value fo cone adius dimension o 1. 26

265 Main Spindle Beaings 1as as dadb Dynamic equivalent axial load Pa=Fa Static equivalent axial load Poa=Fa Load Intenal Mass Refeence Abutment and fillet dimensions Pat cente fee space dimensions numbe mm cm 3 kg mm mm Two ow Two ow da Db as 1as 2a (appox.) (appox.) d1 D2 min max max max HTA1UDB HTA11UDB HTA12UDB HTA13UDB HTA14UDB HTA15UDB HTA16UDB HTA17UDB HTA18UDB HTA19UDB HTA2UDB HTA21UDB HTA22UDB HTA24UDB HTA26UDB HTA28UDB HTA3UDB HTA32UDB HTA34UDB HTA36UDB HTA38UDB HTA4UDB HTA44UDB HTA48UDB HTA52UDB HTA56UDB HTA6UDB HTA64UDB 261

266 Main Spindle Beaings Angula contact ball beaings fo axial loads (ceamic ball type) 5S-HTAUA seies Contact angle 3 d 5 13mm 1 2B 1 D d d1 D2 2a Pat Bounday dimensions Basic load atings Static thust Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D 2B s min 1 1s min 1 Ca Coa Ca Coa lubication lubication 5S-HTA1UADB S-HTA11UADB S-HTA12UADB S-HTA13UADB S-HTA14UADB S-HTA15UADB S-HTA16UADB S-HTA17UADB S-HTA18UADB S-HTA19UADB S-HTA2UADB S-HTA21UADB S-HTA22UADB S-HTA24UADB S-HTA26UADB Minimum allowable value fo cone adius dimension o

267 Main Spindle Beaings 1as as dadb Dynamic equivalent axial load Pa=Fa Static equivalent axial load Poa=Fa Load Intenal Mass Refeence Abutment and fillet dimensions Pat cente fee space dimensions numbe mm cm 3 kg mm mm Two ow Two ow da Db as 1as 2a (appox.) (appox.) d1 D2 min max max max S-HTA1UADB S-HTA11UADB S-HTA12UADB S-HTA13UADB S-HTA14UADB S-HTA15UADB S-HTA16UADB S-HTA17UADB S-HTA18UADB S-HTA19UADB S-HTA2UADB S-HTA21UADB S-HTA22UADB S-HTA24UADB S-HTA26UADB 263

268 Main Spindle Beaings Angula contact ball beaings fo axial loads (ceamic ball type) 5S-HTAU seies Contact angle 4 d 5 13mm 1 2B 1 D d d1 D2 2a Pat Bounday dimensions Basic load atings Static thust Limiting speed numbe dynamic static dynamic static load capacity mm kn kgf kn kgf min -1 gease oil d D 2B s min 1 1s min 1 Ca Coa Ca Coa lubication lubication 5S-HTA1UDB S-HTA11UDB S-HTA12UDB S-HTA13UDB S-HTA14UDB S-HTA15UDB S-HTA16UDB S-HTA17UDB S-HTA18UDB S-HTA19UDB S-HTA2UDB S-HTA21UDB S-HTA22UDB S-HTA24UDB S-HTA26UDB Minimum allowable value fo cone adius dimension o

269 Main Spindle Beaings 1as as dadb Dynamic equivalent axial load Pa=Fa Static equivalent axial load Poa=Fa Load Intenal Mass Refeence Abutment and fillet dimensions Pat cente fee space dimensions numbe mm cm 3 kg mm mm Two ow Two ow da Db as 1as 2a (appox.) (appox.) d1 D2 min max max max S-HTA1UDB S-HTA11UDB S-HTA12UDB S-HTA13UDB S-HTA14UDB S-HTA15UDB S-HTA16UDB S-HTA17UDB S-HTA18UDB S-HTA19UDB S-HTA2UDB S-HTA21UDB S-HTA22UDB S-HTA24UDB S-HTA26UDB 265

270 NTN Main Spindle Beaings

271 NTN Main Spindle Beaings Main Spindle Beaings 12. Tapeed Rolle Beaings CONTENTS 12. Tapeed Rolle Beaings q Load calculation 268 w Beaing designation 268 e Accuacy 269 Recommended fit fo high-pecision tapeed olle beaings 269 t Dimension tables

272 NTN Main Spindle Beaings 12. Tapeed Rolle Beaings 2 Beaing designations Tapeed olle beaings ae designed so that the apexes of the inne ing, oute ing, and olles ae located at a common point on the beaing cente line. Accodingly, the olles oll on the aceway sufaces and slide along the back ib of the inne ing cone, guided by the esultant foce fom the inne ing and oute ing aceways. This beaing is suitable fo handling a adial load, an axial load in one diection, and the esultant load. Also, it has a lage load capacity. In geneal, the cage of a tapeed olle beaing is a punched steel plate type. If P4 o highe is needed fo unning accuacy, NTN ecommends that a highstength machined bass cage to be used. 1 Load calculation Tapeed olle beaings ae geneally used in pais, so thei dynamic equivalent load can be calculated accoding to Table X U DB +xx P4 Toleance class code P5: JIS class 5 P4: JIS class 4 UP: NTN special high pecision Space width dimension Duplex aangement code DB: Back-to-back DF: Face-to-face Intenal modification code Nominal boe diamete Beaing seies code Table 12.1 Beaing aangement and equivalent load Beaing aangement Load condition Axial load Equivalent adial load DB aangement 1 Fa F1 2 F2 F1 F2 Fa Y1 Y2 Fa1 F2 Fa Y2 F2 Fa2 Y2 P1XF1Y1 P2F2 F2 Fa Y2 DF aangement 2 Fa F2 1 F1 F1 F2 Fa Y1 Y2 F1 Fa1 Y1 Fa2 F1 Fa Y1 P1F1 P2XF2Y2 F1 Fa Y1 DB aangement 1 F1 Fa 2 F2 F2 F1 Fa Y2 Y1 F1 Fa1 Y1 Fa2 F1 Fa Y1 P1F1 P2XF2Y2 F1 Fa Y1 DF aangement 2 F2 Fa 1 F1 F2 F1 Fa Y2 Y1 Fa1 F2 Fa Y2 F2 Fa2 Y2 P1XF1Y1 P2F2 F2 F Y2 Note 1: The above ae valid when the beaing intenal cleaance and peload ae zeo. 2: Radial foces in the opposite diection to the aow in the above illustation ae also egaded as positive. 268

273 NTN Main Spindle Beaings 3 Accuacy Table 12.2 Inne ings Nominal boe diamete d ove incl Deviation of mean boe diamete in a single plane dmp Vaiation of boe diamete in a single plane Class 5 Class 4 1 Class 5 Class 4 Class 5 Class 4 Class 5 Class 4 Class 5 Class 4 Class 4 Class 5 Class 4 Class 5 Class 4 high low high low max max max max max high low high low Recommended fit fo high-pecision tapeed olle beaings Vdsp Mean boe diamete deviation Vdmp Radial unout Kia Pependiculaity of inne ing face with espect to the boe Sd Axial unout Sia Width vaiation Bs The toleance of boe diamete deviation ds applicable to class 4 is the same as the toleance of single plane mean boe diamete deviation dmp. Table 12.3 Oute ings Nominal boe diamete D ove incl Deviation of mean outside diamete in a single plane Dmp Class 5 Class 4 2 high low high low Vaiation of outside diamete in a single plane VDsp Class 5 Class max Mean single plane outside diamete vaiation VDmp Class 5 Class 4 max Radial unout Kea Class 5 Class 4 max Pependiculaity of oute ing outside suface with espect to the face SD Class 5 Class 4 max Unit: Axial unout Sea Class 4 max Unit: Deviation of the actual beaing width Ts The toleance of outside diamete deviation Ds applicable to class 4 is the same as the toleance of single plane mean outside diamete deviation Dmp Table 12.4 Fit to shaft Unit: Table 12.5 Fit to housing Unit: Nominal boe diamete d ove incl. Fit between inne ing and shaft Fixed side Tageted 1 intefeence Floating side Tageted 1 intefeence Nominal boe diamete D ove incl. Fit between oute ing and housing Tageted intefeence T 6T 7T 1T 2T 3T T 3T 4T T 1T 13T 4T 5T 6T T 4T 5T Taget the median value. T: Tight (Intefeence) 15T 18T 6T 8T T 6T 7T 269

274 Main Spindle Beaings 5 Dimension tables fo tapeed olle beaings Tapeed Rolle Beaings d 2 95mm 1 C T 2 D 2 B d a pat Bounday dimensions Basic load atings Limiting speed numbe dynamic static dynamic static mm kn kgf min -1 gease oil d D T B C s min 1 1s min 1 2s min 1 C Co C Co lubication lubication 4T-324X T-325X T-326X T-327X T-328X T-329X XU T-321X XU T-3211X XA T-3212X XU T-3213X XU T-3214X XU XU XU XU XU XU XU XU XU XU Minimum allowable value fo chamfe dimension, 1 o 2. 27

275 Main Spindle Beaings Sa Sb 1a Dynamic equivalent adial load Da db a da Db PXFYFa Fa Fa e F F e X Y X Y 1.4 Y2 Static equivalent adial load Po.5FYoFa Note that when PoF, PoF. The values fo e, Y2 and Yo ae given in the table below. Abutment and fillet dimensions Load Facto Axial Mass cente load facto mm mm kg da db Da Db Sa Sb as 1as min max max min min min min max max a e Y2 Y (appox.)

276 Main Spindle Beaings Tapeed Rolle Beaings d 1 19mm 1 C T 2 D 2 B d a pat Bounday dimensions Basic load atings Limiting speed numbe dynamic static dynamic static mm kn kgf min -1 gease oil d D T B C s min 1 1s min 1 2s min 1 C Co C Co lubication lubication 3292XU XU XA XU XA XU XU XU XU XU XU XU XU XU XU XU XU XU XU XU Minimum allowable value fo chamfe dimension, 1 o

277 Main Spindle Beaings Sa Sb 1a Dynamic equivalent adial load Da db a da Db PXFYFa Fa Fa e F F e X Y X Y 1.4 Y2 Static equivalent adial load Po.5FYoFa Note that when PoF, PoF. The values fo e, Y2 and Yo ae given in the table below. Abutment and fillet dimensions Load Facto Axial Mass cente load facto mm mm kg da db Da Db Sa Sb as 1as min max max min min min min max max a e Y2 Y (appox.)

278 NTN Ball Scew Suppot Beaings

279 NTN Ball Scew Suppot Beaings Ball Scew Suppot Beaings 13. Ball Scew Suppot Beaings CONTENTS 13. Ball Scew Suppot Beaings q Angula contact thust ball beaings 2A-BST seies 276 w Duplex angula contact ball beaings HT seies 279 e Needle olle beaings with double-ow thust needle olle beaings AXN seies 279 Needle olle beaings with double-ow thust cylindical olle beaings ARN seies 279 Beaing designations 28 t Beaing pecision 281 y Basic peload and axial igidity 284 u Shaft and housing fit 285 i Applications 285 o Stating toque of BST type 286! Recommended lubication specifications 287!1 Dimension tables Angula contact thust ball beaings BST and BST LXL seies 288 2A-BST and 2A-BST LXL seies 29 Duplex angula contact ball beaings HT seies 294 Needle olle beaings with double-ow thust needle olle beaings AXN, ARN seies

280 NTN Ball Scew Suppot Beaings 13. Ball Scew Suppot Beaings NTN ballscew beaings ae optimized to suppot a ballscew. These beaings ae categoized as shown in Table Table 13.1 Beaing types Type code Notes Boe diamete BST 2A-BST BST LXL/L588 2A-BST LXL/L588 HT AXN ARN Open type thust angula contact ball beaing with 6 contact angle, geneally used with gease lubication Gease-lubicated sealed angula contact ball beaing with 6 contact angle Duplex angula contact ball beaing with 3 contact angle, geneally used with gease lubication Needle olle beaing with double-diection thust needle olle beaing, geneally used with oil lubication Needle olle beaing with double-diection thust cylindical olle beaing, geneally used with oil lubication Angula contact thust ball beaings BST-1B (LXL/L588), 2A-BST-1B (LXL/L588) seies The 2A-BST type incopoates the maximum possible numbe of small balls (compaed with those of a standad beaing), has thicke inne and oute ings, and a lage contact angle of 6. Thus, this type of beaing boasts geate axial igidity. Additionally, since balls ae used as the olling elements, the stating toque of a angula contact thust ball beaing is less than that of a olle beaing. Open (BST and 2A-BST type) and light-contact seals (BST LXL and 2A-BST LXL type) ae available and molded esin cages ae standad. Side faces of BST type beaings ae flush-gound to povide the same face height diffeence fo both the font and back faces. As a esult, beaings of the same pat numbe can be feely combined into DB, DBT, DTBT configuations as illustated in Fig. 13.2, and the adjustment fo a elevant peload is no longe necessay. Evey single beaing is machined to the same face height so that when any aangement is installed on a ballscew the unit has optimal peload. Fo this eason, no time-consuming peload adjustment (adjustment with shims o tightening and loosening while measuing the stating toque) is necessay. Featues 2A-BST-1B (LXL/L588) 1. Unique heat teatment geatly impoves esistance against olling contact fatigue, leading to longe sevice life (appoximately two times that of the conventional type). 2. Both sides ae sealed to enhance contamination esistance and to peseve the gease. (Lightcontact seal type) 3. Special long-life gease is used. (Light-contact seal type) 4. The combination of a unique heat teatment and special gease educes fetting (by 8% o moe fo sliding mode, 9% o moe fo olling mode, compaed to the conventional type). (Light-contact seal type) 5. Pe-gease beaings eliminate the need fo futhe gease packing and allow easie handling. (Lightcontact seal type) Open type 2A-BST type Light-contact sealed type 2A-BST LXL type Fig DB DBT DTBT Fig Beaing aangement 276

281 NTN Ball Scew Suppot Beaings Easy handling 2A-BST LXL type and BST LXL gease-lubicated sealed angula contact ball beaings eliminate the need fo gease filling because they have been packed with gease in advance. You need to only wipe away ust peventive oil befoe use. Seals in diffeent colos ae used fo the font and back sides. The font side (black) and back side (oange) can be identified by the colo of a seal, and you can easily check configuation duing assembly. Load Sliding Ball Plate DB set (back faces in combination) Oange seal Oange seal DF set (font faces in combination) Fig Fetting esistance test (sliding) Table 13.3 Test conditions Mateial Plate Ball Load (N) Max. contact suface pessue (MPa) Loading fequency (1 5 cycle) Sliding cycle (Hz) Amplitude (mm) Lubication Tempeatue Conventional type (SUJ2 without special heat teatment) ULTAGE seies (SUJ2 with special heat teatment) SUJ Test time: 8 h 3.47 Gease Room tempeatue Black seal Black seal Won depth of plate Wea atio Conventional type ULTAGE seies Conventional type1. ULTAGE seies.12 Amount of wea 1/8 Pefomance tests 2A-BST-1B (LXL/L588) Ball scew suppot thust angula contact ball beaings have a unique intenal design in ode to lengthen sevice life and enhance esistance to fetting. (1) Fetting esistance test (sliding) Resistance to fetting while sliding is tested by the fetting esistance test. A conceptual dawing of the test is shown in Fig. 13.3, and the test conditions ae shown in Table In this test, a fixed ball is pushed against a plate, and ecipocated fo a fixed peiod. The volume of ball and plate wea depth ae checked afte testing as shown in Fig Due to a unique heat teatment and special gease (light-contact seal type), amount of wea is educed to 1/5 o less compaed to the conventional type consisting of standad SUJ2 plate mateial and lithiumbased geneal pupose gease. (Fig. 13.4) Wea of ball Wea atio Conventional type ULTAGE seies Conventional type1. ULTAGE seies.2 Amount of wea 1/5 Fig Ratio of fetting coosion in sliding mode 277

282 NTN Ball Scew Suppot Beaings (2) Fetting esistance test (olling) Resistance against fetting while olling is tested in the otating and oscillating type fetting coosion test. A conceptual dawing of the test is shown in Fig. 13.5, and the test conditions ae shown in Table In this test, a housing plate is fixed, and the shaft plate oscillates. The decease in the weight of the beaing plate afte the test is shown in Fig Due to the combination of a unique heat teatment and a special gease (light-contact seal type), the amount of wea is educed to 1/1 o less compaed to the conventional type consisting of standad SUJ2 steel ings and lithium based geneal pupose gease. (Fig. 13.6). (3) Rolling contact fatigue life test Resistance to olling contact fatigue is impoved as a esult of a special heat teatment, leading to a longe sevice life compaed to the standad heat-teated type model in both clean and contaminated oil. (Fig. 13.7) Table 13.5 Test conditions Beaing (mm) Radial load (kn) Shaft speed (min -1 ) Lubication Atmosphee tempeatue ( C) Evaluated with deep goove ball beaing VG56 tubine oil 6 Load Standad heat-teated ULTAGE seies Clean oil Life atio Standad heat-teated 1. ULTAGE seies times longe compaed to conventional Load (kn) Max. contact suface pessue (MPa) Test time (h) Oscillating cycle (Hz) Oscillating angle (deg) Lubication Tempeatue Oscillation Fig Fetting esistance test (olling) Table 13.4 Test conditions Beaing Evaluated with thust ball beaing 5124 (mm) Gease Room tempeatue Oil mixed with foeign mattes Life atio Standad heat-teated ULTAGE seies Standad heat-teated 1. ULTAGE seies times longe compaed to conventional Fig Effect of special heat teatment on olling contact fatigue life Wea atio Wea 1/1 1 Conventional type (beaing plate SUJ2, lithium base geneal pupose gease) 2 ULTAGE seies (beaing plate SUJ2 with special heat teatment, special gease) 1 Conventional type (beaing plate SUJ2, lithium base geneal pupose gease) 1. 2 ULTAGE seies (beaing plate SUJ2 with special heat teatment, special gease).1 Fig Ratio of fetting coosion while olling 278

283 NTN Ball Scew Suppot Beaings (4) Gease life test Sevice life of the gease has been damatically extended compaed to lithium-base geneal pupose gease (Fig. 13.8). (Special gease is available fo only the light-contact seal type.) Table 13.6 Test conditions Beaing (mm) Radial load (N) Axial load (N) Shaft speed (min -1 ) Atmosphee tempeatue ( C) Evaluated with deep goove ball beaing Duplex angula contact ball beaings HT seies HT type duplex angula contact ball beaings featue lage axial load capacity while maintaining the same dimensions as a standad angula contact ball beaing (contact angle: 3 ). Beaings smalle than the BST type ae available fo use in small poducts. Life atio Lithium base geneal pupose gease ULTAGE seies (Special gease) Lithium base geneal pupose gease 1. ULTAGE seies 18.9 (Special gease) 18 times longe compaed to conventional type Fig Gease life atio (5) Gease leakage test Light-contact type seals eliminate gease leakage fom the beaing. (Fig. 13.9) Table 13.7 Test conditions Beaing (mm) Axial load (kn) Shaft speed (min -1 ) Atmosphee 2A-BST472-1BDFP ows unning fo two hous fo each step Room tempeatue Fig HT 3 Needle olle beaings with double-ow thust needle olle beaings AXN seies Needle olle beaings with double-ow thust cylindical olle beaings ARN seies AXN and ARN type beaings have thust needle olle o thust cylindical olle beaings on both sides of a adial needle olle beaing. The oute ing side face of the adial needle olle beaing is used as the aceway of both thust beaings. These beaings can withstand axial loads in both diections while maintaining compact designs. The adial needle olle beaings ae suitable fo heavy adial loads. The axial igidity of the AXN type is extemely enhanced since the thust needle olle beaings ae used fo axial loads. Likewise, the axial igidity of the ARN type is impoved. Since the axial load capacity of this type is lage than the AXN type, this type is suitable fo heavy axial loads. Oil lubication is ecommended fo the ARN type. Leaked gease quantity Lithium base geneal pupose gease ULTAGE seies (Special gease) Lithium base geneal pupose gease 1.77g ULTAGE seies.1g (Special gease) Fig AXN Fig Gease leakage Fig ARN 279

284 NTN Ball Scew Suppot Beaings 4 Beaing designations The pat numbe fo a ballscew beaing consists of a type code, dimension code, and vaious suffixes. 2A-BST type 2A - BST B LXL DBT P4 / L588 Gease code L588: Uea based special gease Toleance class code P5: JIS Class 5 (equivalent) P4: JIS Class 4 (equivalent) UP: NTN Class Aangement code Seal code LXL:Light contact ubbe seals Identification code Peload code and added numbe -1B: Standad peload -11B: Light peload Outside diamete (mm) Nominal boe diamete (mm) Beaing type code Heat teatment HT type AXN and ARN type 74HTDF/GMP4 Toleance class code P5: JIS class 5 P4: JIS class 4 Intenal cleaance code GM: Medium peload GH: Heavy peload Aangement code Intenal design code Nominal boe diamete (See dimension tables.) Dimension seies code Beaing type code AXN 252 P4 Toleance class code P5: JIS Class 5 P4: JIS Class 4 Dimension Boe diamete, outside diamete (mm) Beaing type code AXN ARN 28

285 NTN Ball Scew Suppot Beaings 5 Beaing pecision The pecision of ballscew beaings vaies depending on the beaing type. 2A-BST type Available in NTN class 5 (toleance class code P5), class 4 (toleance class code P4) each complying with JIS standads, and gade UP (toleance class code UP). The classes ae listed in ascending ode. 7HT type Same pecision as the main spindle angula contact ball beaing. Classes 5 and 4 ae available. AXN, ARN types NTN standad classes 4 and 5 complying with the JIS standads. Accuacy of 2A-BST type Table 13.8 Inne ings Nominal boe Single plane mean boe diamete diamete deviation d Δdmp ove incl Class 5 Class 4 1 Class UP 1 Class 5 Class 4 Class UP Class 5 Class 4 Class UP Class 5 Class 4 Class UP Class 5 Class 4 Class UP Class 5 Class 4 Class UP high low high low high low max max max max high low high low high low Width vaiation VBs Radial unout Kia Face unout with boe Sd Axial unout Sia Unit: Width deviation ΔBs The toleance of outside diamete deviation Δds applicable to classes 4 and UP is the same as the toleance of single plane mean outside diamete deviation Δdmp. Table 13.9 Oute ings Nominal boe diamete d Single plane mean outside diamete deviation ΔDmp Width vaiation VCs Class 5 Class 4 1 Class UP 1 Class 5 Class 4 Class UP ove incl. high low high low high low max Radial unout Kea Class 5 Class 4 Class UP max Outside suface inclination SD Class 5 Class 4 Class UP max Axial unout Sea All classes Unit: Width deviation ΔCs All classes Identical to Si elative to d on the same beaing. Identical to ΔBS elative to d on the same beaing. 2 The toleance of outside diamete deviation ΔDs applicable to classes 4 and UP is the same as the toleance of single plane mean outside diamete deviation ΔDmp. 281

286 NTN Ball Scew Suppot Beaings Accuacy of HT type Table 13.1 Inne ings Nominal boe diamete d Single plane mean boe diamete deviation Δdmp Class 5 Class 4 1 Class 2 1 ove incl. high low high low high low Single adial plane boe diamete vaiation Vdp Diamete seies 9 Diamete seies,2 Class 5 Class 4 Class 2 Class 5 Class 4 Class 2 max max Mean boe diamete deviation Vdmp Class 5 Class 4 Class 2 max 1 The toleance of boe diamete deviation Δds, applicable to classes 4 and 2, is the same as the toleance of mean boe diamete deviation Δdmp. This applies to the diamete seies o 2 fo class 4, and all the diamete seies fo class 2. 2 Applicable to individual beaing ings manufactued fo duplex beaings Inne ing adial unout Kia Class 5 Class 4 Class 2 max Table Oute ings Nominal outside diamete D Single plane mean outside diamete deviation ΔDmp Class 5 Class 4 3 Class 2 3 ove incl. high low high low high low Single adial plane outside diamete deviation VDp Diamete seies 9 Diamete seies,2 Class 5 Class 4 Class 2 Class 5 Class 4 Class 2 max max Mean single plane outside diamete deviation VDmp Class 5 Class 4 Class 2 max Oute ing adial unout Kea Class 5 Class 4 Class 2 max The toleance of outside diamete deviation ΔDs, applicable to classes 4 and 2, is the same as the toleance of mean outside diamete deviation ΔDmp. This applies to the diamete seies o 2 fo class 4, and all the diamete seies fo class

287 NTN Ball Scew Suppot Beaings Face unout with boe Sd Class 5 Class 4 Class 2 max Axial unout Sia Width vaiation ΔBs Duplex Single beaing beaing 2 Class 5 Class 4 high low high low high low Class 5 Class 4 Class 2 Class 5 Class 4 Class 2 max Unit: Width vaiation VBs Class 5 Class 4 Class 2 max Unit: Outside suface inclination SD Class 5 Class 4 Class 2 max Axial unout Sea Class 5 Class 4 Class 2 max Width vaiation ΔCs All classes Width vaiation VCs Class 5 Class 4 Class 2 max Identical to ΔBs elative to d of the same beaing

288 NTN Ball Scew Suppot Beaings Accuacy of AXN and ARN type Table Inne ing and oute ing Nominal beaing boe dia. d o nominal beaing outside dia. D Deviation of mean boe 1 diamete in a single plane Δdmp Thust inne 1 ing boe dia. deviation Δdis Class 5 Class 4 Ove Incl. High Low High Low High Low Applicable only to dimension d Class 5 Class 4 High Low High Low Applicable only to dimension D. Deviation of mean outside 2 diamete in a single plane ΔDmp Beaing height deviation ΔTs High Low 37 Oute ing width deviation High ΔCs Low 13 Radial 1 inne ing adial unout Kia Class 5 Class 4 Max Oute 2 ing adial unout Kea Class 5 Class 4 Max Pependiculaity 2 of oute ing outside suface with espect to the face SD Class 5 Class 4 Max Unit: Thust inne ing 1 and oute ing 2 thickness vaiation Sia, Sea Class 5 Class 4 Max Basic peload and axial igidity Basic peloads fo each type of ball scew suppot beaings ae shown in the dimension tables. The peloads can be alteed depending on the equied igidity. Contact NTN in such a case. In the AXN and ARN types, igidity is nomally enhanced by tightening the thust beaing ings to supply peload. Peloads and toques ae shown in the dimensions tables to help contol basic peload. A beaing that allows peset peload by tightening the beaing aceways to adjust the cleaance A between the both thust beaing ings and adial beaing ings (Fig ) is also available. Ask NTN fo details. Axial igidity of the 2A-BST type DB duplex aangement and the AXN type at the basic peload ae shown in Figs and (Notes) Axial displacement is measued unde standad peloaded. 3 Axial displacementm A-BST1747-1B,2A-BST247-1B 2A-BST3572-1B,2A-BST472-1B 2A-BST2562-1B,2A-BST362-1B 2A-BST49-1B 2A-BST5512-1B,2A-BST612-1B 1 2 Axial loadkn 1KN=12kgf 2A-BST451-1B, 2A-BST51-1B, 2A-BST551-1B Fig BST type igidity chat Fig AXN type axial displacementm 1 5 AXN252 AXN357 AXN2557 AXN475 AXN362 AXN458 AXN Axial loadkn 1KN=12kgf Fig AXN type igidity chat 284

289 NTN Ball Scew Suppot Beaings 7 Shaft and housing fits Recommended fit and toleances of shaft and housing shoulde squaeness ae shown in Figs and Table Shaft and housing fits Table Toleance of shoulde squaeness Unit: Type code Shaft outside diamete Fit Housing Diamete classification mm ove incl. BST HT Type code AXNARN BST HT AXN ARN h5 j5 H6 J Applications The BST type is mainly installed on ball scews of machine tool feed systems, and two to fou ow aangements ae used in many cases. This type is popula because geased sealed angula contact ball beaings ae easy to handle. The back-to-back duplex aangement is commonly used because it allows acquisition of the specified peload by tightening the inne ing. The face-to-face duplex aangement may be used if moe pecise alignment is equied. It is not commonly used fo machine tools. Examples of beaing aangement ae shown in Figs and Fig Fig

290 NTN Ball Scew Suppot Beaings 9 Stating toque of 2A-BST type Refeence stating toque values fo 2A-BST beaings ae shown in Tables and Table Open type BST and 2A-BST BST17X47-1B 2A-BST17X47-1B BST2X47-1B 2A-BST2X47-1B BST25X62-1B 2A-BST25X62-1B BST3X62-1B 2A-BST3X62-1B BST35X72-1B 2A-BST35X72-1B BST4X72-1B 2A-BST4X72-1B BST4X9-1B 2A-BST4X9-1B BST45X75-1B 2A-BST45X75-1B BST45X1-1B 2A-BST45X1-1B BST5X1-1B 2A-BST5X1-1B BST55X1-1B 2A-BST55X1-1B DF type DB type Stating toque (efeence) Nmmkgfcm DFT type DBT type DTFT type DTBT type DFTT type DBTT type Table Light-contact sealed type BST LXL/L588 and 2A-BST LXL/L588 BST17X47-1BLXL 2A-BST17X47-1BLXL BST2X47-1BLXL 2A-BST2X47-1BLXL BST25X62-1BLXL 2A-BST25X62-1BLXL BST3X62-1BLXL 2A-BST3X62-1BLXL BST35X72-1BLXL 2A-BST35X72-1BLXL BST4X72-1BLXL 2A-BST4X72-1BLXL BST4X9-1BLXL 2A-BST4X9-1BLXL BST45X75-1BLXL 2A-BST45X75-1BLXL BST45X1-1BLXL 2A-BST45X1-1BLXL BST5X1-1BLXL 2A-BST5X1-1BLXL BST55X1-1BLXL 2A-BST55X1-1BLXL DF type DB type Stating toque (efeence) Nmmkgfcm DFT type DTFT type DFTT type DBT type DTBT type DBTT type

291 NTN Ball Scew Suppot Beaings! Recommended lubication specifications BST and HT ball scew suppot angula contact ball beaings ae geneally lubicated with gease. (BST LXL beaings with light-contact seals ae packed with gease.) AXN and ARN beaings ae geneally lubicated with ciculated oil. Gease lubication Recommended type of gease Lithium-mineal oil base geneal pupose gease of which base oil viscosity is high (fo example, Alvania Gease S2, Shell). Oil lubication Recommended type of oil Hydaulic oils o othe industial oils used fo lubication of sliding sufaces with viscosity gade ISO VG 68 o highe ae ecommended. Oil quantity Recommended oil quantity depends on the lubicating method. As a geneal guideline, the oil flow ate should be 5 to 1 cm 3 /min. Recommended gease fill 25% of the capacity shown in the dimensions tables Recommended gease filling method Refe to "6. Handling of Beaings, q Rinsing of beaings and gease filling" in the Technical Data section. 287

292 Ball Scew Suppot Beaings!1 Dimension tables Angula contact thust ball beaings fo ball scews BST seies Contact angle 6 d 17 6mm Dynamic equivalent axial load PaXFYFa Numbe of ows in beaing aangement Numbe of ows subjected to axial load Fa / F2.17 X Y Fa / F2.17 X Y D D1 d2 B 1 d d1d2 6 Static equivalent axial load PoaFa3.98F Open type Contact sealed type Pat numbe 主要寸法 Bounday dimensions 基本動定格荷重 Ca Basic dynamic 基本静定格荷重 ated load Ca Coa Basic static ated 呼び番号 load Coa kn kn mm mm kgf kn kgf kn 1 列でアキシアル W ow When thee owwhenkgf one owwhen two owwhen thee ow kgf d D B s min 1 d 1s min D 1 荷重を受ける場合 B s min 1 bl1s load min 1 beas axial 1 loadbeas2axial loadbeas 3 axial loadbeas 1 axial load2 3 BST17X47-1B BST17X47-1BLXL BST2X47-1B BST2X47-1BLXL BST25X62-1B BST25X62-1BLXL BST3X62-1B BST3X62-1BLXL BST35X72-1B BST35X72-1BLXL BST4X72-1B BST4X72-1BLXL BST4X9-1B BST4X9-1BLXL BST45X75-1B BST45X75-1BLXL BST45X1-1B BST45X1-1BLXL BST5X1-1B BST5X1-1BLXL BST55X1-1B BST55X1-1BLXL BST55X12-1B BST55X12-1BLXL BST6X12-1B BST6X12-1BLXL Minimum allowable value fo chamfe dimension o

293 Ball Scew Suppot Beaings When one ow beas axial load DB) When two ows bea axial load DBT) When two ows bea axial load DTBT) When thee ows bea axial load DBTT) Dimensions Space Static axial load capacity capacity mm cm 3 kn Single-ow kgf d1 d2 D1 D2 (appox.)

294 Ball Scew Suppot Beaings Angula contact thust ball beaings fo ball scews 2A-BST seies Contact angle 6 d 17 6mm Dynamic equivalent axial load PaXFYFa Numbe of ows in beaing aangement Numbe of ows subjected to axial load Fa / F2.17 X Y Fa / F2.17 X Y D D1 d2 B 1 d d1d2 6 Static equivalent axial load PoaFa3.98F Open type Contact sealed type Pat numbe 主要寸法 Bounday dimensions 基本動定格荷重 Ca Basic dynamic 基本静定格荷重 ated load Ca Coa Basic static ated 呼び番号 load Coa kn kn mm mm kgf kn kgf kn 1 列でアキシアル W ow When thee owwhenkgf one owwhen two owwhen thee ow kgf d D B s min 1 d 1s min D 1 荷重を受ける場合 B s min 1 bl1s load min 1 beas axial 1 loadbeas2axial loadbeas 3 axial loadbeas 1 axial load2 3 2A-BST17X47-1B A-BST17X47-1BLXL A-BST2X47-1B A-BST2X47-1BLXL A-BST25X62-1B A-BST25X62-1BLXL A-BST3X62-1B A-BST3X62-1BLXL A-BST35X72-1B A-BST35X72-1BLXL A-BST4X72-1B A-BST4X72-1BLXL A-BST4X9-1B A-BST4X9-1BLXL A-BST45X75-1B A-BST45X75-1BLXL A-BST45X1-1B A-BST45X1-1BLXL A-BST5X1-1B A-BST5X1-1BLXL A-BST55X1-1B A-BST55X1-1BLXL A-BST55X12-1B A-BST55X12-1BLXL A-BST6X12-1B A-BST6X12-1BLXL Minimum allowable value fo chamfe dimension o 1. 29

295 Ball Scew Suppot Beaings When one ow beas axial load DB) When two ows bea axial load DBT) When two ows bea axial load DTBT) When thee ows bea axial load DBTT) Dimensions Space Static axial load capacity capacity mm cm 3 kn Single-ow kgf d1 d2 D1 D2 (appox.)

296 Ball Scew Suppot Beaings!2 Peload and axial sping constant Angula contact thust ball beaings fo ball scews BST Type, 2A-BST Type Contact angle 6 d 17 6mm Pat numbe BST17X47 2A-BST17X47 BST2X47 2A-BST2X47 BST25X62 2A-BST25X62 BST3X62 2A-BST3X62 BST35X72 2A-BST35X72 BST4X72 2A-BST4X72 BST4X9 2A-BST4X9 BST45X75 2A-BST45X75 BST45X1 2A-BST45X1 BST5X1 2A-BST5X1 BST55X1 2A-BST55X1 BST55X12 2A-BST55X12 BST6X12 2A-BST6X12 Basic peload:-1b Double-ow (DF/DB types) Tiple-ow (DFT/DBT types) Fou-ow (DTFT/DTBT types) Peload Axial sping constant Peload Axial sping constant Peload Axial sping constant N kgf N/μm kgf/μm N kgf N/μm kgf/μm N kgf N/μm kgf/μm NOTE) Peload values ae those obtained fom matched beaings. Sping constants mean axial sping constants on beaings subjected to the peloads listed in the table. 292

297 Ball Scew Suppot Beaings Pat numbe BST17X47 2A-BST17X47 BST2X47 2A-BST2X47 BST25X62 2A-BST25X62 BST3X62 2A-BST3X62 BST35X72 2A-BST35X72 BST4X72 2A-BST4X72 BST4X9 2A-BST4X9 BST45X75 2A-BST45X75 BST45X1 2A-BST45X1 BST5X1 2A-BST5X1 BST55X1 2A-BST55X1 BST55X12 2A-BST55X12 BST6X12 2A-BST6X12 Light peload:-11b Double-ow (DF/DB types) Tiple-ow (DFT/DBT types) Fou-ow (DTFT/DTBT types) Peload Axial sping constant Peload Axial sping constant Peload Axial sping constant N kgf N/μm kgf/μm N kgf N/μm kgf/μm N kgf N/μm kgf/μm

298 Ball Scew Suppot Beaings Duplex angula contact ball beaings (HT seies) Contact angle 3 d 6 4mm B B Dynamic equivalent axial load PaXFYFa 1 1 Numbe of ows in beaing aangement Numbe of ows subjected to axial load X Fa / F.8 Y X Fa / F.8 Y D2 d1 d D Back-to-back (DB) Example diagam 1 Pat numbe Bounday dimensions Basic load atings Dimensions Diagam dynamic static dynamic static mm kn kgf mm Back-to-back Face-to-face (DB) (DF) d D 2B s min 1 1s min 1 Ca Coa Ca Coa d1 d2 D1 D2 79M6ADB 79M6ADF M6DB 7M6DF M8ADB 79M8ADF M8DB 7M8DF HTDB 7HTDF HTDB 71HTDF HTDB 72HTDF HTDB 723HTDF HTDB 74HTDF HTDB 724HTDF HTDB 725HTDF HTDB 726HTDF HTDB 728HTDF Minimum allowable value fo chamfe dimension o 1. 2 The numbe of ows means the numbe of beaings that bea the axial load. 3 Peload values ae those obtained fom matched beaings. 4 Sping constants mean axial sping constants on beaings subjected to the peloads listed in the table. 294

299 Ball Scew Suppot Beaings B B 2B 2B D1 d2 d D D2 d1 d D D1 d1 d D Face-to-face (DF) Example diagam 1 Back-to-back (DB) Example diagam 2 Face-to-face (DF) Static axial load 2 Medium peload (GM) Heavy peload (GH) Stating Stating capacity Peload 3 Axial sping constant 4 toque Peload 3 Axial sping constant 4 toque kn kgf N kgf N/μm kgf/μm N mm (appox.) N kgf N/μm kgf/μm N mm (appox.) DB DBT DB DBT DB DBT DB DBT DB DBT DB DBT Single ow Double ow DF DFT DF DFT DF DFT DF DFT DF DFT DF DFT

300 Ball Scew Suppot Beaings Needle olle beaings with double-diection thust needle olle beaings (AXN seies) d 2 5mm T C DW 1 D d dw F D1 Pat Bounday dimensions Basic load atings numbe dynamic static dynamic static dynamic static mm adial adial axial d dw D D1 T C F Dw s min 1 1s min 1 kn kgf kn C Co C Co Ca Coa +.61 AXN AXN AXN AXN AXN AXN AXN Minimum allowable value fo cone adius dimension o 1. 2 Stating toque value elative to the standad peload. 296

301 Ball Scew Suppot Beaings 1a a Da da Basic load atings Limiting Radial Abutment and Peload Stating 2 Mass Pat dynamic static speeds cleaance fillet dimensions toque numbe axial min -1 μm mm N N mm kg kgf gease oil da Da as 1as Ca Coa lubication lubication min max min max max max (appox.) (appox.) AXN AXN AXN AXN AXN AXN AXN59 297

302 Ball Scew Suppot Beaings Needle olle beaings with double-diection thust cylindical olle beaings (ARN seies) d 2 7mm T C DW 1 D d dw F D1 Pat Bounday dimensions Basic load atings numbe dynamic static dynamic static dynamic static mm adial adial axial d dw D D1 T C F Dw s min 1 1s min 1 kn kgf kn Minimum allowable value fo cone adius dimension o 1. 2 Stating toque value elative to the standad peload. C Co C Co Ca Coa ARN252T ARN ARN2557T ARN ARN362T ARN ARN357T ARN ARN475T ARN ARN458T ARN ARN ARN ARN ARN ARN ARN

303 Ball Scew Suppot Beaings 1a a Da da Basic load atings Limiting Radial Abutment and Peload Stating 2 Mass Pat dynamic static speeds cleaance fillet dimensions toque numbe axial min -1 μm mm N N mm kg kgf gease oil da Da as 1as Ca Coa lubication lubication min max min max max max (appox.) (appox.) ARN252T ARN ARN2557T ARN ARN362T ARN ARN357T ARN ARN475T ARN ARN458T ARN ARN ARN ARN ARN ARN ARN

304 NTN Poducts 14. NTN Poducts Cam followes fo pallet change Cam followes ae often used on wok piece tansfe systems (such as pallet changes) of machine tools (such as machining centes) to handle the lage loads geneated by these systems. NTN offes vaious types of cam followes that include a eady-to-install cam followe optimized fo pallet changes. 2 Cam followe numbeing The pat numbe fo cam followes fo pallet changes is same as that of NTN special cam followes. KRX Stuctue and featues The oute ing wall thickness is maximized fo esistance to heavy load o impact load. NTN cam followes fo pallet changes featue a compact design and can be easily mounted by tightening a setscew. The oute diamete, oute ing width, and stud diamete ae identical to the dimensions of NTN's standad cam followes (KR type). Because cam followes fo pallet changes ae actuated less fequently, they do not need to be elubicated. The oil hole has been deleted. Cost is educed by emoving the gease hole and the thead fom the stud. 3 Accuacy The accuacy of NTN cam followes fo pallet change is same as that of NTN standad cam followes (JIS class ). 4 Fit Suffix Oveall length Oute dia. Stud dia. Type code Wall thickness of oute ing maximized Oil hole emoved fom stud The NTN pallet change cam followe has a special stud that is eadily secued with a setscew. As illustated below, a setscew locks the pallet change cam followe in the axial and cicumfeential diections. Setscew Oute diamete, oute ing width, and stud diamete ae identical to those of standad cam followe Thead emoved fom stud (to be secued with setscew) Fig Typical mounting aangement Fig Schematic of NTN pallet change cam followe 3

305 NTN Poducts 5 Radial intenal cleaance The adial cleaance of NTN cam followes fo pallet changes is same as that of NTN standad cam followes (Table 14-1). Table Inne ing Nominal inscibed cicle diamete Fw Cleaance CN (nomal cleaance) ove incl. min max Lubication NTN cam followes fo pallet changes ae pefilled with lithium based gease and can be used in a tempeatue ange of -25 to +1 C. Unde the assumption that the use does not pefom elubication with gease, the standad NTN pallet change cam followe does not have an oil hole fo elubication. (If necessay, the cam followe can be povided with an oil hole o a hole fo mounting a gease nipple.) Upon equest, NTN can also povide cam followes with a synthetic ubbe seal. Lubication between the outside suface of beaing and tack is also necessay. Failue to popely lubicate the outside suface of the cam followe could lead to pematue wea of the beaing. (Example application of NTN cam followes fo pallet change) Photo: coutesy of Tsudakoma Cop. 31