Lead-screw Assemblies

Transcription

1 Lead-screw ssembies 3

2 Overview of Lead-screw ssembies LED-SREW TENOLOGIES aydon Kerk Motion Soutions, Inc. Phone: Internationa: aydon Kerk Motion Soutions products have been designed specificay for motion contro appications. They are not compromised adaptations of genera purpose screws or nuts. The screw thread form is designed for maximum ife, quiet operation, and compatibiity with aydon Kerk Motion Soutions anti-backash nut designs. KERK LED-SREWS are avaiabe in standard diameters from 1/8-in (3.2mm) to 15/16-in (23mm), with standard eads from.012-in to amost 4-in (0.30mm to 92mm) incuding hard metric and eft hand threads. ustom sizes and eads can be specia ordered. Most stock screws are manufactured from 303 stainess stee and are produced with aydon Kerk Motion Soutions excusive precision roing process. Other materias are avaiabe on specia order. Positiona bi-directiona repeatabiity (with Kerk anti-backash nut) is within 50 microes (1.25 micron) and standard ead accuracy is better than in./in. (mm/mm). Lead accuracies are avaiabe to.0001-in./in. (mm/mm). aydon Kerk Motion Soutions tota in-house manufacturing and quaity contro assure uniform and consistent products. KERK NUTS are avaiabe in 8 standard anti-backash designs (MP, ZX, WDG, NT, KD, VD, NTG, Z); genera purpose FW Series pus the Mini Series. (See Product omparison hart for size avaiabiity). ustom nut configurations and mountings are aso readiy avaiabe. The Kerk brand anti-backash designs provide assembies which are wear compensating with ow frictiona drag and exceptiona positiona repeatabiity. Operation to more than 300 miion es of trave can be achieved. aydon Kerk Motion Soutions provides nuts in a wide range of wear resistant, sef-ubricating thermopastic materias. 10

3 Lead-screw ssembies: nti-ackash Technoogies xia Take-up Mechanism The standard method for taking up backash is to bias two nut haves axiay using some type of compiant spring. (Wavy washer, compression spring, rubber washer, etc.) NUT LF SPRING PRELOD NUT LF LED-SREW TENOLOGIES The unit is very stiff in the direction in which the nut haf is oaded against the fank of the screw thread. owever, in the direction away from the screw thread, the nut is ony as axiay stiff as the amount of preoad which the spring exerts. NUT LF SPRING FORE LOD GINST SREW FLNK For exampe, if the maximum axia oad to which the system is subjected is 50 bs., the amount of spring preoad must be equa to, or greater than, 50 bs. in order to maintain intimate screw/nut contact. The probems arising from preoading in this manner are increased drag torque and nut wear. Obviousy, the higher the oad at the screw/nut interface, the higher the required torque to drive the nut on the screw and the more susceptibe the unit is to nut wear. n aternate method repaces the spring with a stiff spacer sized to fit exacty between the two nut haves. NUT LF (L) STIFF SPER NUT LF There is no excessive preoad force at the interface and the unit is capabe of carrying high axia oads in either direction with no backash. This is fine initiay. owever, as use time increases, wear begins on the nut threads causing a gap to deveop between the spacer (L) and the nut haves. 1 2 NUT LF (L) NUT LF This gap ( 1 + 2) is now the amount of backash which has deveoped in the unit. This backash can be removed by repacing the stiff spacer with a new spacer equa to (L ). This process, athough effective, woud be extremey costy and difficut to impement on a continuous basis. The Soution What is needed, then, is a stiff spacer which wi continuay expand to accommodate the wear which occurs during use. This is done by creating a spacer threaded at one end with a compimentary nut torsionay biased to advance when a gap deveops. The thread at the end of the spacer is a fine heix such that an axia oad wi not backdrive the nut once spacer growth has occurred. L The preoad on the unit is ony the amount necessary to turn the spacer nut on the spacer rod and is independent of the externa system oadings. We thus have a sef-wear compensating unit which has extremey ow frictiona drag torque yet high axia stiffness. L

4 Lead-screw ssembies: Lubrication LED-SREW TENOLOGIES Kerkote and ack Ice TFE oatings aydon Kerk Motion Soutions, Inc. offers mutipe options for ubrication. Kerk ead-screw nuts feature sef-ubricating poymers. When maximum performance is required, Kerkote and ack Ice TFE coatings provide unmatched resuts in the most demanding appications. The purpose of TFE coating is to suppy a more even distribution of ubricant than is normay found when using standard sef-ubricating pastics on stee. The wear ife, coefficient of friction and resuting torque to drive a ead screw assemby are highy governed by the abiity of the engineered pastic to suppy sufficient ubrication to the nut/screw interface. The inabiity of the interna ubricating agents in some pastics to consistenty migrate to the surface may resut in erratic drag torques and unpredictabe wear. Kerkote TFE oating Kerkote TFE coating covering the entire screw surface resuts in an extremey even ubrication distribution. Test resuts indicate system torque requirements are consistenty ow with itte or no change in required frictiona driving torque, even with changes in motor R.P.M. aydon Kerk Motion Soutions has deveoped a custom composition Kerkote TFE specificay for our ead screw and nut materias. It is appied using an automated process and provides extended nut ife and smooth operation with itte additiona cost. Kerkote TFE is a soft coating, a ong-term dry ubricant that is optimized for softer pastics ike acetas and nyons, with or without mechanica reinforcement. Lubrication to the nut/screw interface occurs by the nut picking up Kerkote TFE partices from the coating as we as from the migration of the interna ubricant within the pastic nut. though care is taken to ensure that chips and voids do not occur in the coating, sma voids have been shown to have no effect on system performance. The transfer of TFE to the nut continues throughout the operating ife of the assemby as ong as the nut periodicay traves over areas with Kerkote TFE coating. The ubricant, athough soid, aso has some spreading abiity as in fuid ubricants. Kerkote TFE coated screws provide the maximum eve of sef-ubrication and shoud not be additionay ubricated or used in environments where ois or other ubricant contamination is possibe. ack Ice TFE oating ack Ice TFE coating shares many of the benefits of Kerkote TFE but, in contrast, is a hard coating that offers exceptiona durabiity in a types of environments, with virtuay any type of poymer nut. ack Ice TFE coating remains on the screw, offering a ow friction surface upon which the nut traves. Rather than acting as a dry ubricant, ack Ice TFE is an anti-friction coating whose surface properties dispace the meta to which it is appied. Though it is not intended for use with meta or gass fiber reinforced nuts, ack Ice TFE is bonded securey to the screw s surface and can withstand abrasion from contamination, rigid poymer systems, fuid impingement and wash down appications. ack Ice TFE can be used in the presence of more aggressive environment conditions, or anywhere reduced friction and a permanent coating is desired. oth Kerkote and ack Ice TFE coatings offer the advantages of dry ubrication. These are maintenance-free coatings that are designed to ast the ife of the product. They are intended to be used without additiona ubricants, thereby further increasing the vaue of Kerk ead-screw assembies through eimination of the most common faiure of screw driven drives, ubrication faiure. There are certain appications where externa ubrication may be desired. These incude the use of nut materias such as gass reinforced pastic or meta. Greases, when used propery can provide unique capabiities and aydon Kerk Motion Soutions does offer a seection of greases deveoped specificay for these appications. Pease contact a saes engineer for assistance seecting the best ubricant for your requirements. 12

5 Lead-screw ssembies: Materias 303 Stainess Stee Kerk brand ead-screws and inear rais start with premium grade 303 stainess stee. aydon Kerk Motion Soutions, Inc. has identified the materia properties most critica for producing the very high quaity roed stee screws in the word and contros these to eves unmatched in the industry. ecause of our eadership position, we are abe to utiize this exceptiona quaity stee without having to charge premium prices. LED-SREW TENOLOGIES Kerk stainess stee ead-screws and guide rais are corrosion resistant, non-magnetic, and compatibe with many demanding processes. The idea starting point for a maintenance-free product, this premium quaity stainess stee is being used in numerous appications incuding medica appications, cean rooms, food and human contact, sat spray, cryogenics and vacuum. Kerkite omposite Poymers In addition to the Kerk sef-ubricating aceta nut materia, aydon Kerk Motion Soutions offers a variety of custom compounded Kerkite composite poymers. Kerkite poymers are a famiy of high performance materias that offer exceptiona wear properties with the cost and design advantages afforded through injection moding. Kerkite poymers offer a variety of mechanica, therma and eectrica properties and are compatibe with many chemicas and environmenta conditions. Kerkite omposite Poymers are avaiabe options for most Kerk Lead-screw s and are standard materias for Linear Rai and Spine Shaft bushings, RGS arriages and rai ushings and End Supports. Each member of the Kerkite famiy is compounded with ubricants, reinforcements and thermopastic poymers formuated to provide optimum performance in its target conditions and appications, resuting in superior performance and extended ife. cornerstone of the aydon Kerk Motion Soutions advantage is design fexibiity. Kerkite omposite Poymers, aong with our injection moding and mod making capabiities, offer huge design advantages and cost savings compared with non-modabe materias. Kerkite high performance poymers outperform other pastics and outast meta bushings and bearings. When combined with Kerkote or ack Ice TFE coatings, Kerkite omposite Poymers have been shown to provide hundreds of miions of es of trave in customer appications whie continuing to maintain precise, accurate motion and positioning. Specia Materias In addition to the Kerk standard materia 303 stainess stee, sef ubricating aceta and Kerkite high performance composite poymers we aso work with a vast array of custom materias. Kerk has roed screws in many other materias, incuding 316 stainess, 400 series stainess, precipitate hardening materias, carbon stee, auminum, and titanium. Kerk nuts had been produced in many aternative pastics incuding PEEK, poyester, Toron, Vespe, PVDF, UMW, Ertayte and customer-suppied speciaty materias. We have aso provided meta nuts made from bronze, brass, and stainess stee. With so much fexibiity in our manufacturing process, if the materia can be moded, machined, ground, or roed, aydon Kerk Motion Soutions can ikey process it using state of the art machine toos, injection moding and mod making, grinding and thread roing equipment. aydon Kerk Motion Soutions exces at suppying the best overa soution to meet our customers requirements. ontact aydon Kerk Motion Soutions to find out how you can benefit from these choices. 13

6 Lead-screw ssembies: Design & Engineering Data LED-SREW TENOLOGIES Design and Engineering Data ccuracy aydon Kerk Motion Soutions, Inc uses a unique precision roing process for screw manufacturing. Standard ead accuracy for Kerk screws is.0006 in./in. (mm/mm). Lead accuracies are avaiabe up to.0001 in./in. (mm/mm). Pease consut the factory for higher ead accuracies. ssembies have an extremey high bi-directiona repeatabiity of 50 micro-es (1.25 micron). End Machining aydon Kerk Motion Soutions can custom machine screws to your specifications or provide cut-to-ength screws for your own machining. ritica Speed This is the rotationa speed at which a screw may experience vibration or other dynamic probems. See RITIL SPEED RT to determine if appication parameters resut in speed approaching critica. To minimize critica speed probems: use a onger ead, choose a arger diameter or increase bearing mount support. s s can be specified up to 12 ft. (4M) from stock, (depending on diameter and ead). ut to ength screws are offered in 6-in increments (6-in, 12, 18,...) +1.0-in/-0-in. Lead dvancement per revoution. screws are isted by ead, not pitch. Lead = Pitch x Number of Starts Pitch rest-to-crest distance or one divided by threads per. (On a mutipe start thread, the pitch equas the ead divided by the number of starts.) 14

7 Lead-screw ssembies: Design & Engineering Data Traverse Speed The nut materias we use provide ong wear-ife over a wide variety of conditions. owever, very high oads and/or speeds wi acceerate nut wear. Specia materias may be required for these situations. We offer the foowing guideines for continuous duty inear traversing speeds for optimum ife: LED-SREW TENOLOGIES Lead Traverse Speed Lead Traverse Speed 1/10-1/2-in 4-in/sec. 1/2-1-in 10-in/sec /2-in 30-in/sec mm 100 mm/sec mm 250 mm/sec mm 760 mm/sec. Maximum though the Kerk nti-ackash ssembies are capabe of withstanding reativey high oads without catastrophic faiure, these units have been designed to operate under the oading shown in the size charts. Efficiency Efficiency is the reationship of work input to work output. It shoud not be confused with mechanica advantage. Listed efficiencies are theoretica vaues based on Kerkote TFE coated screws. The required motor torque to drive a ead screw assemby is the sum of three components: the inertia torque, drag torque, and torque-to-move oad. It must be noted that this is the torque necessary to drive the ead screw assemby aone. dditiona torque associated with driving frictiona bearings and motor shafts, moving components, and drag due to genera assemby misaignment must aso be considered. Inertia : T j = I α Where I = screw inertia α = anguar acceeration : The Kerk nti-ackash ssembies are typicay suppied with drag torque of 1 to 7 oz.- in. The magnitude of the drag torque is dependent on the standard factory settings or settings specified by the customer. Generay, the higher the preset force, the better the nti-ackash characteristics. -to-move: LOD x LED T = L 2p x EFFIIENY ack Driving Sometimes referred to as reversibiity, back driving is the abiity of a screw to be turned by a thrust oad appied to the nut. Generay, back driving wi not occur when the screw ead is ess than 1/3 the diameter for uncoated screws or 1/4 the diameter for Kerkote TFE coated screws. For higher eads where back driving is ikey, the torque required for hoding a oad is: LOD x LED x KDRIVE EFFIIENY T = b 2p Straightness straightness is measured as Tota Indicator Runout(TIR). The standard straightness for ead screws is.003-in/ft. aydon Kerk Motion Soutions can provide tighter specifications on customer request. screws are hand straightened before shipping. 15

8 Lead-screw ssembies: Design & Engineering Data LED-SREW TENOLOGIES Intertia Size Mechanica Properties Inch Inertia (oz- sec 2 /) Dimensiona Toerances.X.XX.XXX Type ±.02 ±.010 ±.005 < L 4 4 < L < L < L 250 Metric Grease ompatibiity hart MP ZX Z KD VD WDG FW NT NTG 5/64 (2) 1/8 (3.2) 9/64 (3.5) 5/32 (3.97) 3/16 (4.76) 7/32 (5.55) 1/4 (6) 5/16 (8) 3/8 (10) 7/16 1/2 5/8 (16) 3/4 (19) 7/8 (22) 15/16 (24) Grease No No No No 3.4 x x x x x x x x x x x x x x x 10 5 Lubrication oatings Kerkote ack Ice nti-ackash Life Series Z ZX KD NT VD FW NTG Without Kerkote TFE oating (cm) 40 to 60 miion (100 to 150 miion) 5 to 10 miion (12 to 25 miion) 40 to 60 miion (100 to 150 miion) 80 to 100 miion (200 to 250 miion) 100 to 125 miion (250 to 315 miion) 100 to 125 miion (250 to 315 miion) 200 to 225 miion (500 to 570 miion) N/, Typica ackash.003 to.010 (.076 to.25) 5 to 10 miion (12 to 25 miion) With Kerkote TFE oating (cm) 150 to 200 miion (380 to 500 miion) 15 to 40 miion (38 to 100 miion) 150 to 200 miion (380 to 500 miion) 180 to 230 miion (450 to 580 miion) 200 to 250 miion (500 to 635 miion) 200 to 250 miion (500 to 635 miion) 300 to 350 miion (760 to 880 miion) N/, Typica ackash.003 to.010 (.076 to.25) 15 to 40 miion (38 to 100 miion) nti-backash ife is defined as the nut s abiity to compensate for wear whie maintaining its zero backash properties. bove ife data is based on 25% of the dynamic oad rating. NT stye does not incude mini series sizes. Life wi vary with oading, operating environment, and duty cyce. The onger screw eads generay provide onger ife. ± 0.1 ± 0.15 ± 0.2 ± 0.3 MP WDG 16 Mechanica Properties Lead-screw Materia 303 Stainess Stee (options avaiabe) s Materia Poyaceta with Lubricating dditive Surface Finish etter than 16 micro Tensie Strength 9,700 psi oefficient of Expansion 6.0 x 10 5 in/in/ F ssemby Standard Operating oefficent of Friction Temp. Range to F* (0-93 )* Static =.08 = **.09 ** * Very high or ow temperatures may cause significant changes in the nut fit or drag torque. Pease ca aydon Kerk Motion Soutions for optiona temperature range materias. ** with Kerkote TFE oating

9 Lead-screw ssembies: Standard End Machining aydon Kerk Motion Soutions, Inc. Phone: Internationa: Standard End Machining ross Dried oe Turned Journa LED-SREW TENOLOGIES ex Drive End Mae Square End Femae Singe Fat driver Sot Doube Fat Standard reak Edge Ground Journa 17

10 Lead-screw ssembies: ow to Order Lead-screws Kerk Lead-screws LED-SREW SSEMLIES KERK LED-SREWS are avaiabe in standard diameters from 1/8-in (3.2mm) to 15/16-in (23mm), with standard eads from.012-in to amost 4-in (0.30mm to 92mm) incuding metric and eft hand threads. ustom sizes and eads can be specia ordered. Most stock screws are manufactured from 303 stainess stee and are produced with aydon Kerk Motion Soutions excusive precision roing process. Other materias are avaiabe on specia order. Positiona bi-directiona repeatabiity (with Kerk anti-backash nut) is within 50 micro-es (1.25 micron) and standard ead accuracy is better than in./in. (mm/mm). Lead accuracies are avaiabe to.0001-in./in. (mm/mm). Pease consut factory for more detais. aydon Kerk Motion Soutions tota in-house manufacturing and quaity contro assure uniform and consistent products. Identifying the part number codes when ordering ZX F K R XXXX Prefix: LSS ( Ony) Series MP ZX WDG NT KD VD NTG Z FW ing Stye = d (Trianguar) F = d (Round) P = (Trianguar with piot) T = ed S = ony For Micro and Mini s Ony: = arre R = Rectanguar Lubrication S = Uncoated K = Kerkote TFE oating G = Grease SS-17 Standard N = ony Direction R = Right hand L = Left hand (Refer to eadscrew charts for avaiabiity) ode (Refer to ead-screw charts) Nomina Lead ode (Refer to ead-screw charts) Unique Identifier Proprietary suffix assigned to a specific customer appication. The identifier can appy to either a standard or custom part. EXMPLES: LSSSSR = Lead-screw ony, uncoated, right hand thread, 1/4-in nomina screw diameter, thread ead, without an assigned unique identifier WDGR XXXX = ssemby: WDG Series, trianguar fanged mount, ack Ice TFE coating, right hand thread, 3/8-in nomina screw diameter, thread ead, without an assigned unique identifier ZXTKR XXXX = ssemby: ZX Series, thread mounting, Kerkote TFE coating, right hand thread, 7/16-in nomina screw diameter, thread ead, without an assigned unique identifier Specia environments (temperature, cean room, contaminents, etc.) For appications assistance or order entry, ca your the aydon Kerk Motion Soutions Engineering at NOTE: Not a thread eads are avaiabe in a screw diameters New nuts and eads are continuay being added. ontact aydon Kerk Motion Soutions for atest avaiabiity. 18

11 Lead-screws: Lead-screw Size List Lead-screw Size List (es) ode Lead (es) LED ODE Left and vaiabe Outside (for Reference) (es) Root (for Reference) (es) Efficiency %* ompatibe Styes 5/ ** 30 ** 36 ** 52 ** 66 ** FW 1/ L Ony NT NTG FW LED-SREW SSEMLIES NT NTG FW 9/ NT NTG FW 5/ L Ony NT NTG FW 3/ MP WDG NT NTG FW 7/ Shaded areas have been transated from their designed or mm dimension to an equivaent mm or dimension WDG NT NTG FW * Listed efficiencies are theoretica vaues based on Kerkote TFE coated ead-screws ** Listed efficiencies for Micro screws are theoretica vaues based on non-coated ead-screws

12 Lead-screws: Lead-screw Size List Lead-screw Size List (es) ode Lead (es) LED ODE Left and vaiabe Outside (for Reference) (es) Root (for Reference) (es) Efficiency %* ompatibe Styes LED-SREW SSEMLIES 1/ MP ZX Z WDG NT NTG FW 5/ MP ZX Z KD WDG NT NTG FW Shaded areas have been transated from their designed or mm dimension to an equivaent mm or dimension. *Listed efficiencies are theoretica vaues based on Kerkote TFE coated ead-screws 20

13 Lead-screws: Lead-screw Size List Lead-screw Size List (es) ode Lead (es) LED ODE Left and vaiabe Outside (for Reference) (es) Root (for Reference) (es) Efficiency %* ompatibe Styes 3/ MP ZX Z KD WDG NT NTG FW LED-SREW SSEMLIES 7/ ZX Z WDG NT FW Shaded areas have been transated from their designed or mm dimension to an equivaent mm or dimension. *Listed efficiencies are theoretica vaues based on Kerkote TFE coated ead-screws 21

14 Lead-screws: Lead-screw Size List Lead-screw Size List (es) ode Lead (es) LED ODE Left and vaiabe Outside (for Reference) (es) Root (for Reference) (es) Efficiency %* ompatibe Styes LED-SREW SSEMLIES 1/ ZX Z WDG NT VD FW 5/ ZX Z NT VD FW Shaded areas have been transated from their designed or mm dimension to an equivaent mm or dimension. *Listed efficiencies are theoretica vaues based on Kerkote TFE coated ead-screws 22

15 Lead-screws: Lead-screw Size List Lead-screw Size List (es) ode Lead (es) LED ODE Left and vaiabe Outside (for Reference) (es) Root (for Reference) (es) Efficiency %* ompatibe Styes 3/ Z NT VD FW LED-SREW SSEMLIES 7/ Z NT VD FW 15/ L Ony Z NT FW Shaded areas have been transated from their designed or mm dimension to an equivaent mm or dimension. *Listed efficiencies are theoretica vaues based on Kerkote TFE coated ead-screws aydon externa stye inear actuators can be made avaiabe with the various ead codes shown in this section (whie maintaining the ead screw diameter as described in the inear actuator specifications). 23

16 Lead-screw ssembies: Styes nti-ackash: Sef-ompensating, Zero ackash LED-SREW SSEMLIES MP Series Light s, ompact Design Exceptionay compact sef-ubricating aceta nut; ideay suited for appications using oi or grease. nti-ackash: Specia Purpose ZX Series Light s Patented sef-ubricating poyaceta nut; precise positiona accuracy and repeatabiity at a ow cost. VD Series eavy s, igh xia Stiffness Deivers maximum oad carrying capabiity, with highest axia and radia stiffness. WDG Series Moderate s n exceptionay compact design to provide stiffness and baanced accuracy for precise positioning. sefubricating aceta nut, axiay preoaded, the patented wedge design ocks the nut at the correct preoad without excessive drag. s: Genera Purpose KD Series Moderate s, Low For moderate oad appications; deivers increased oad capacity and greater axia stiffness with ow drag torque. s: Miniature NT Series Fu Range, Fexibe Design Sef-compensating nut assemby maintains axia stiffness throughout its ife with minimum system drag torque. Easiy modified for custom appications. s: Micro Z Series djustabe /Utra Smooth Trave Unique patented sefubricating poyaceta nut can be adjusted for torque ranges. NTG Series djustabe /ompact Size ompact anti-backash assemby aows drag torque to be pre-set according to system requirements. s: ustom FW Series For appications that do not require anti-backash or wear compensation Long ife at minima cost. ustom aydon Kerk Motion Soutions can work with you to design custom nuts in a variety of materias specificay for your appication. MINI Series Miniature ead-screw assembies dvanced mini eadscrew motion contro technoogy for smascae ead-screw appications 3 to 5 mm (1/8 to 3/16-in.). vaiabe in NT and NTG anti-backash and FW stye genera purpose configurations. MIRO Series Revoutionary micro designs ead-screw / nut product design that enabes a whoe new range of motion contro appications. vaiabe in FW stye configurations with 2 mm (5/64-) diameter ead-screws. 24

17 Lead-screw ssembies: Feature Matrix Feature Matrix aydon Kerk Motion Soutions. has a wide variety of standard nut designs which offer many features to choose from. Once an appication s most important requirements are understood, it becomes a matter of choosing the nut which best meets those requirements. Occasionay, more than one nut might do the job, but in the vast majority of situations, one nut design wi stand above the rest. The matrix beow may hep to narrow down the choices. Kerk nuts can be modified to some degree to hep them better meet specific requirements. aydon Kerk Motion Soutions is aso very wiing to discuss custom nut designs where requirements and voumes justify. Feature ompactness Stye: MP ZX Z KD WDG NT NTG VD FW LED-SREW SSEMLIES apabiity Minima N/ Vibration Damping (horizonta) N/ Vibration Damping (vertica) N/ Smoothness of Operation (printing, scanning) ackash/wear ompensation apabiity N/ Ease of User djustment of /ackash N/ N/ N/ N/ Stiffness (ess axia bi-directiona compiance) N/ biity to dd Modifications biity to manufacture with ustom Materia biity to Work with Finer Leads (<0.2-in) biity to Work with Long Leads (>1-in) GOOD ETTER EST 25

18 Lead-screw ssembies: omparison hart omparison of Kerk haracteristics LED-SREW SSEMLIES Nomina 5/64-in (2mm) 1/8-in (3mm) 3/16-in (4mm) 1/4-in (6mm) 5/16-in (8mm) 3/8-in (10mm) 7/16-in (11mm) 1/2-in (13mm) 5/8-in (16mm) 3/4-in (19mm) 7/8-in (22mm) 15/16-in (24mm) Property Static Frictiona Static Frictiona Static Frictiona Static Frictiona Static Frictiona Static Frictiona Static Frictiona Static Frictiona Static Frictiona Static Frictiona Static Frictiona Static Frictiona MP 5 bs. (2.3 kg) 4 oz.-in. (.03 NM) 5 bs. (2.3 kg) 4 oz.-in. (.03 NM) 8 bs. (3.6 kg) 5 oz.-in. (.04 NM) 8 bs. (3.6 kg) 5 oz.-in. (.04 NM) Stye Series ZX Z KD WDG NT NTG VD FW 5 bs. (2.3 kg).5-3 oz.-in. ( NM) 10 bs. (5 kg) 1-5 oz.-in. ( NM) 10 bs. (5kg) 1-5 oz.-in. ( NM) 15 bs. (7 kg) 2-6 oz.-in. ( NM) 25 bs. (11 kg) 3-7 oz.-in. ( NM) 35 bs. (16 kg) 4-8 oz.-in. ( NM) 5 bs. (2.3 kg).5-2 oz.-in. ( NM) 10 bs. (5 kg) oz.-in. ( NM) 10 bs. (5 kg) oz.-in. ( NM) 15 bs. (7 kg) 2-5 oz.-in. ( NM) 25 bs. (11 kg) 2-5 oz.-in. ( NM) 35 bs. (16 kg) 3-7 oz.-in. ( NM) 55 bs. (25 kg) 5-9 oz.-in. ( NM) 55 bs. (25 kg) 5-9 oz.-in. ( NM) 55 bs. (25 kg) 5-9 oz.-in. ( NM) 20 bs. (10 kg) oz.-in. ( NM) 20 bs. (10 kg) oz.-in. ( NM) 10 bs. (4.5 kg) 4 oz.-in. max. (.03 NM max.) 10 bs. (4.5 kg) 4 oz.-in. max. (.03 NM max) 25 bs. (11.3 kg) 5 oz.-in. max. (.04 NM max) 25 bs. (11.3 kg) 5 oz.-in. max. (.04 NM max) 75 bs. (34 kg) 9 oz.-in. max. (.06 NM max) 75 bs. (34 kg) 9 oz.-in. max. (.06 NM max) 5 bs. (2.3 kg).1-.5 oz.-in. ( NM) 5 bs. (2.3 kg).1-.5 oz.-in. ( NM) 10 bs. (4.6 kg).5-2 oz.-in. ( NM) 20 bs. (10 kg) oz.-in. ( NM) 20 bs. (10 kg) oz.-in. ( NM) 30 bs. (13 kg) oz.-in. ( NM) 100 bs. (45 kg) 2-6 oz.-in. ( NM) 125 bs. (56 kg) 2-6 oz.-in. ( NM) 150 bs. (68 kg) 3-7 oz.-in. ( NM) 200 bs. (90 kg) 4-8 oz.-in. ( NM) 200 bs. (90 kg) 4-8 oz.-in. ( NM) 5 bs. (2.3 kg).1-.5 oz.-in. ( NM) 5 bs. (2.3 kg).1-.5 oz.-in. ( NM) 10 bs. (4.6 kg).5-2 oz.-in. ( NM) 20 bs. (10 kg) oz.-in. ( NM) 20 bs. (10 kg) oz.-in. ( NM) 150 bs. (68 kg) 2-6 oz.-in. ( NM) 250 bs. (113 kg) 2-6 oz.-in. ( NM) 350 bs. (159 kg) 3-7 oz.-in. ( NM) 350 bs. (159 kg) 3-7 oz.-in. ( NM) 10 bs. (4.5 kg) Free Wheeing 25 bs. (11 kg) Free Wheeing 25 bs. (11 kg) Free Wheeing 50 bs. (20 kg) Free Wheeing 75 bs. (35 kg) Free Wheeing 75 bs. (35 kg) Free Wheeing 90 bs. (40 kg) Free Wheeing 150 bs. (68 kg) Free Wheeing 225 bs. (100 kg) Free Wheeing 350 bs. (160 kg) Free Wheeing 500 bs (227 kg) Free Wheeing 500 bs. (227 kg) Free Wheeing 26

19 nti-ackash s: MP Series MP Series for ight oads, compact design The Kerk MP Series anti-backash assemby utiizes a genera purpose sef-compensating nut in an exceptionay compact package. This aows equipment designers to utiize smaer assembies without sacrificing stroke ength. The MP anti-backash nut design is aso ideay suited for appications using grease or oi. The standard MP Series assemby utiizes a sef-ubricating aceta nut, axiay preoaded, on a 303 stainess stee screw. End machining of screw to customer specifications and Kerkote or ack Ice TFE screw coating are optiona. Various axia compression springs are aso avaiabe, depending on appication requirements. Pease consut factory for detais. MP and MPP Series D Thickness ing oe E F ot irce G ub ub J (max.) bs (Kg) oz-in (NM) MP MPP (with piot) 3/16 (4) 7/32 (5) 1/4 (6) 5/16 (8) 3/8 (10) E (16) (16) (16) (19) (19) MP 1.05 (26.6) 1.05 (26.6) 1.05 (26.6) 1.32 (33.5) 1.32 (33.5) (28.6) (28.6) (28.6) (4.1) (3.7) (22.2) 0.08 (2.04) (15.9) (4.1) (3.7) (22.2) 0.08 (2.04) (15.9) (4.1) (3.7) (22.2) 0.08 (2.04) (15.9) (5.08) 0.200(5.08) (28.6) (3.05) (5.08) 0.200(5.08) (28.6) (3.05) MPP (with piot) 5 (2.3) 5 (2.3) 5 (2.3) 8 (3.6) 8 (3.6) 4 (.03) 4 (.03) 4 (.03) 5 (.04) 5 (.04) NTI-KLS NUT SSEMLIES MPT Series (max.) M* N bs (Kg) oz-in (NM) 3/16 (4) (16) 1.05 (26.6) 9/ (6.1) 5 (2.3) 4 (.03) MPT 7/32 (5) 1/4 (6) 5/16 (8) (16) (16) (19) 1.05 (26.6) 1.05 (26.6) 1.32 (33.5) 9/ / / (6.1) (6.1) (8.1) 5 (2.3) 5 (2.3) 8 (3.6) 4 (.03) 4 (.03) 5 (.04) 3/8 (10) (19) 1.32 (33.5) 5/ (8.1) 8 (3.6) 5 (.04) * metric avaiabe as required 27

20 nti-ackash s: ZX Series ZX Series for ighter oads The patented Kerk ZX Series anti-backash assemby offers an effective inear actuator for design operations requiring precise positiona accuracy and repeatabiity, with minimum cost. The standard ZX unit utiizes a patented sef-ubricating poyaceta nut radiay preoaded on a 303 stainess stee screw. NTI-KLS NUT SSEMLIES The ZX assemby, through its unique transfer of oads, offers exceptiona torque consistency and repeatabiity when traversing in either direction. The inherent damping quaities of the ZX design make it ideay suited for vertica appications requiring noise or vibration contro. End machining to customer specifications and Kerkote TFE screw coating are optiona, as are designs for specia operating configurations or environments. 28

21 nti-ackash s: ZX Series ZX Series: ZX Series 1/4 (6) 5/16 (8) 3/8 (10) 7/16 1/2 5/8 (16).50 (12.7).70 (17.8).70 (17.8) (22.6) 1.06 (26.9) 1.0 (26) 1.9 (48) 1.9 (48) 1.9 (48) 2.0 (51) 2.0 (51) D (41.2) 1.75 (44.5) Thickness ing oe E.18 (4.6).18 (4.6).18 (4.6).18 (4.6).26 (6.6).26 (6.6) F.140 (3.6).200 (5.08).200 (5.08).200 (5.08).200 (5.08).200 (5.08) ot irce G.750 (28.6) (28.6) (28.6) 0 (31.8) (34.9) bs (Kg) 5 (2.3) 10 (5) 10 (5) 15 (7) (16) oz-in (NM).5-3 ( ) 1-5 ( ) 1-5 ( ) 2-6 ( ) 3-7 ( ) 4-8 ( ) ZXT Series: NTI-KLS NUT SSEMLIES Thickness ZXT Series 1/4 (6) 5/16 (8) 3/8 (10) 7/16 1/2 5/8 (16).50 (12.7).70 (17.8).70 (17.8) (22.6) 1.06 (26.9) 1.3 (33) 2.2 (56) 2.2 (56) 2.3 (59) 2.3 (59) 2.4 (61) D (25.9) 1.06 (26.9) E.22 (5.6).17 (4.3).17 (4.3).12 (3.1).12 (3.1).15 (3.8) M* 5/8-18 5/8-18 5/ / / /16-16 N.16 (4.1) 3.8 (9.7).38 (9.7).38 (9.7).38 (9.7).50 (12.7) bs (Kg) 5 (2.3) 10 (5) 10 (5) 15 (7) (16) oz-in (NM).5-3 ( ) 1-5 ( ) 1-5 ( ) 2-6 ( ) 3-7 ( ) 4-8 ( ) * metric avaiabe as required 29

22 nti-ackash s: KD Series KD Series for moderate oads, ow drag torque The Kerk KD Series anti-backash assemby makes use of the Kerk patented XIL TKE-UP MENISM (see Lead-screw ssembies: nti-ackash Technoogies section) to provide backash compensation. The unique spit nut with torsiona take-up provides increased oad capacity and axia stiffness over comparaby sized ZX units. though the KD offers high axia stiffness, frictiona drag torque ( oz.- in.) is very ow. The anti-backash mechanism in the KD unit eiminates the need for oad compensating preoad forces. The assemby consists of a 303 stainess stee screw mated with a sefubricating poyaceta nut. End machining to customer specifications and Kerkote TFE screw coating are optiona. NTI-KLS NUT SSEMLIES KD Series: KD Series 5/16 (8) 3/8 (10) (50.8) 2.0 (50.8) D Thickness ing oe E.19 (4.8).19 (4.8) F.200 (5.08).200 (5.08) ot irce G (28.58) (28.58) bs (Kg) 20 (10) 20 (10) oz-in (NM) ( ) ( ) KDT Series: Thickness KDT Series 5/16 (8) 3/8 (10) (55.9) 2.2 (55.9) D E.05 (1.27).05 (1.27) M* 3/4-20 3/4-20 N.35 (8.9).35 (8.9) bs (Kg) 20 (10) 20 (10) oz-in (NM) ( ) ( ) * metric avaiabe as required 30

23 nti-ackash s: WDG Series WDG Series for moderate oads, compact designs The Kerk WDG Series anti-backash assemby utiizes an exceptionay compact design to provide stiffness and baanced accuracy for precise positioning. The unique wedge design ocks the nut at the correct preoad without excessive drag. Shorter than other sef-compensating nuts with simiar performance, the W nut permits the design of smaer assembies without sacrificing stroke ength. wear or momentary overoad is accommodated through the WDG Series compensation mechanism, which maintains positiona accuracy in demanding appications. The standard W Series assemby utiizes a sef-ubricating aceta nut, axiay preoaded, on a 303 stainess stee screw. End machining to customer specifications and Kerkote or ack Ice TFE screw coating are optiona, as are designs for specia operating configurations or environments. WDG and WDGP Series D ing Thickness oe E F ot irce G ub ub J (max.) bs (Kg) oz-in (NM) WDG & WDGP (with piot) 3/16 (4) 7/32 (5) 1/4 (6) 5/16 (8) 3/8 (10) 7/16 1/2 WDG E (16) (16) (16) (19) (19) 1.05 (26.6) 1.05 (26.6) 1.05 (26.6) 1.32 (33.5) 1.32 (33.5) (52.8) (52.8) (28.6) (28.6) (28.6) (4.1) (4.1) (4.1) (3.7) (3.7) (3.7) (22.2) (22.2) (22.2) 0.08 (2.04) 0.08 (2.04) 0.08 (2.04) (15.9) (15.9) (15.9) (5.08) 0.200(5.08) (28.6) (3.05) (5.08) 0.200(5.08) (28.6) (3.05) (44.5) () (5.6) (44.5) () (5.6) (35.7) (6.48) (35.7) (6.48) 0 WDGP (with piot) 10 (4.5) 10 (4.5) 10 (4.5) 25 (11.3) 25 (11.3) 75 (34) 75 (34) 4 (.03) 4 (.03) 4 (.03) 5 (.04) 5 (.04) 9 (.06) 9 (.06) NTI-KLS NUT SSEMLIES WDGT Series (max.) M* N bs (Kg) oz-in (NM) 3/16 (4) (16) 1.05 (26.6) 9/ (6.1) 10 (4.5) 4 (.03) 7/32 (5) (16) 1.05 (26.6) 9/ (6.1) 10 (4.5) 4 (.03) WDGT 1/4 (6) 5/16 (8) 3/8 (10) (16) (19) (19) 1.05 (26.6) 1.32 (33.5) 1.32 (33.5) 9/ /8-18 5/ (6.1) (8.1) (8.1) 10 (4.5) 25 (11.3) 25 (11.3) 4 (.03) 5 (.04) 5 (.04) 7/ (52.8) 15/16-16 (12.7) 75 (34) 9 (.06) 1/ (52.8) 15/16-16 (12.7) 75 (34) 9 (.06) * metric avaiabe as required 31

24 nti-ackash s: NT Series NT Series: NT Series fu range, fexibe designs The Kerk NT Series anti-backash assemby is designed for higher oad appications than the ZX or KD series units. Using the speciay designed take up mechanism, it maintains axia stiffness throughout its ife whie system torque is hed to a minimum. The need to highy preoad the nut to compensate for oad has been eiminated with the Kerk NT Series assemby. The nut is manufactured with a sef-ubricating poyaceta designed to run efficienty on the precision roed shafting. s are 303 stainess and are avaiabe with the proprietary ong - ife Kerkote TFE coating. The NT s simpe, compact design can be easiy modified for custom appications. The NT assemby provides ow drag torque, high system stiffness, smooth operation, and ong ife throughout its oad and speed range. NTI-KLS NUT SSEMLIES NT Trianguar 1/4 (6) 5/16 (8) 3/8 (10) 7/16.52 (13.2) (22.9) 1.1 (28) 1.8 (46) 1.8 (46) 1.8 (46) D 1.62 (41.2) Thickness ing oe E.16 (4.0).20 (5.1).20 (5.1).23 (5.7) F.143 (3.63).200 (5.08).200 (5.08).200 (5.08) ot irce G.750 (28.6) (28.6) 0 (31.8) ub Width.08 (2.0).10 (2.54).10 (2.54).10 (2.54) ub J.500 (12.7) (22.2) bs (Kg) 10 (4.5) 20 (9.1) 20 (9.1) 30 (13.6) oz-in (NM).5-2 ( ) ( ) ( ) ( ) NTF Round 1/2 5/8 (16) 3/4 (19) 7/8 (22) 15/16 (24) 1.06 (26.9) 1.38 (34.9) 1.56 (39.6) 1.75 (44.5) 1.75 (44.5) 2.1 (54) 2.3 (59) 2.7 (67) 2.8 (70) 2.8 (70) 1.75 (44.5) 2.13 (54.1) 2.38 (60.5) 2.63 (66.8) 2.63 (66.8).25 (6.4).28 (7.0).31 (7.9).38 (9.5).38 (9.5).220 (5.59).220 (5.59).220 (5.59).220 (5.59).220 (5.59) (35.71) (44.45) (50.80) (57.15) (57.15).12 (3.0).10 (2.54).10 (2.54).12 (3.0).12 (3.0) 1.25 (31.8) 1.75 (44.5) 1.75 (44.5) 100 (45.5) 125 (56.8) 150 (68.2) 200 (90.9) 200 (90.9) 2-6 ( ) 2-6 ( ) 3-7 ( ) 4-8 ( ) 4-8 ( ) NT MINI Series see MINI Series Products Trianguar Round 32

25 nti-ackash s: NT Series NTT Series: NTT 1/4 to 7/16-in 1/4 (6) 5/16 (8) 3/8 (10) 7/16.52 (13.2) (22.9) 1.1 (28) 1.8 (45) 1.8 (45) 1.8 (46) M* 7/ /4-20 3/ /16-16 N.25 (6.4).38 (9.5).38 (9.5).38 (9.5) bs (Kg) 10 (4.5) 20 (9.1) 20 (9.1) 30 (13.6) oz-in (NM).5-2 ( ) ( ) ( ) ( ) NTT 1/2 to 15/16-in 1/2 5/8 (16) 3/4 (19) 7/8 (22) 15/16 (24) 1.06 (26.9) 1.38 (34.9) 1.56 (39.6) 1.75 (44.5) 1.75 (44.5) 2.1 (54) 2.3 (59) 2.7 (67) 2.8 (70) 2.8 (70) NT MINI Series see MINI Series Products 15/ / / / / (9.5).38 (9.5).50 (12.7).50 (12.7).50 (12.7) 100 (45.5) 125 (56.8) 150 (68.2) 200 (90.9) 200 (90.9) 2-6 ( ) 2-6 ( ) 3-7 ( ) 4-8 ( ) 4-8 ( ) * metric avaiabe as required NTI-KLS NUT SSEMLIES N M 33

26 nti-ackash s: VD Series The Kerk VD Series anti-backash assemby provides the maximum oad carrying capabiity and the highest axia and radia stiffness of any Kerk nut assemby. Designed for smooth, quiet operation and ong ife, the VD assemby provides ow drag torque by making use of the patented Kerk XIL TKE-UP MENISM (see Lead-screw ssembies: nti-ackash Technoogies section). and wear associated with high pre-oad forces are eiminated with the VD Series. s are 303 stainess stee with Kerk s custom Kerkote TFE extended ife coating optiona. N ssembies are avaiabe cut-to-ength or with screws machined to your requirements. NTI-KLS NUT SSEMLIES VD Series: VDF 1/2 5/8 (16) 3/4 (19) 7/8 (22) 1.12 (28.5) 1.38 (35.1) 1.62 (41.2) 1.62 (41.2) DI. M 2.3 (59) 2.6 (66) 2.8 (71) 2.8 (71) D 1.75 (44.5) 2.08 (53) 2.38 (60.5) 2.38 (60.5) DI. Thickness ing oe E.23 (5.9).28 (7.1).31 (7.9).31 (7.9) F.22 (5.60).22 (5.60).22 (5.60).22 (5.60) ot irce G (35.71) (44.45) (50.80) (50.80) ub Width.12 (3.1) N/ N/ N/ ub J.93 (23.62) N/ N/ N/ bs (Kg) 150 (68) 250 (113) 350 (159) 350 (159) oz-in (NM) 2-6 ( ) 2-6 ( ) 3-7 ( ) 3-7 ( ) VD Series: VDT 1/2 5/8 (16) 3/4 (19) 7/8 (22) 1.12 (28.5) 1.38 (35.1) 1.62 (41.2) 1.62 (41.2) 2.5 (64) 2.8 (72) 3.12 (79) 3.12 (79) M* 15/ / / /8-16 N.50 (12.7).50 (12.7).50 (12.7).50 (12.7) bs (Kg) 150 (68) 250 (113) 350 (159) 350 (159) oz-in (NM) 2-6 ( ) 2-6 ( ) 3-7 ( ) 3-7 ( ) * metric avaiabe as required 34

27 nti-ackash s: Z Series Z Series adjusabe drag torque/utra smooth trave The patented Kerk Z Series offers a cost effective anti-backash assemby for appications requiring precise positiona accuracy and repeatabiity. The Z has been deveoped specificay for those appications that require very smooth and consistent motion such as printing, scanning, and coordinate measurement systems. n added benefit of the Z design is the abiity to manuay adjust the drag torque setting to match the specific requirements of the appication. This drag torque can aso be set at the factory to meet individua customer specifications. The inherent damping quaities of the Z design make it ideay suited for appications requiring noise or vibration contro. NTI-KLS NUT SSEMLIES The standard Z unit utiizes a sef-ubricating poyaceta nut radiay preoaded on a 303 stainess stee screw. End machining to customer specifications and Kerkote TFE screw coating are optiona. 35

28 NTI-KLS NUT SSEMLIES 36 nti-ackash s: Z Series ZT Series: 1/4 (6) 5/16 (8) 3/8 (10) 7/16 1/2 5/8 (16) 1.3 (33) 2.2 (56) 2.2 (56) 2.3 (59) 2.3 (59) 2.3 (58.9) (26.4) 1.06 (26.9).12 (3.1).15 (3.8).15 (3.8).10 (2.5).10 (2.5).14 (3.6).53 (13.5).74 (18.8).74 (18.8) (22.6) 1.06 (26.9).16 (4.1).38 (9.7).38 (9.7).38 (9.7).38 (9.7).50 (12.7) 5 (2.3) 10 (5) 10 (5) 15 (7) (16).5-2 ( ) ( ) ( ) 2-5 ( ) 2-5 ( ) 3-7 ( ) D E M* N bs (Kg) oz-in (NM) Thickness 5/8-18 5/8-18 5/ / / /16-16 * metric avaiabe as required Z Series: 1/4 (6) 5/16 (8) 3/8 (9) 7/16 1/2 5/8 (16) 3/4 (19) 7/8 (22) 15/16 (24) 1.9 (48) 1.9 (48) 1.9 (48) 2.00 (50.8) 2.00 (50.8) 2.88 (73.2) 2.88 (73.2) 2.88 (73.2) 38.1) 1.62 (41.2) 1.75 (44.5) 2.63 (66.8) 2.63 (66.8) 2.63 (66.8).18 (4.6).18 (4.6).18 (4.6).18 (4.6).28 (7.1).28 (7.1).38 (9.6).38 (9.6).38 (9.6).143 (3.6).200 (5.08).200 (5.08).200 (5.08).200 (5.08).200 (5.08).218 (5.5).218 (5.5).218 (5.5).53 (13.5).74 (18.8).74 (18.8) (22.6) 1.06 (26.9) 1.70 (43.2) 1.70 (43.2) 1.70 (43.2).750 (19.05) (28.58) (28.58) (28.58) (31.75) (34.93) 2.25 (57.2) 2.25 (57.2) 2.25 (57.2) 5 (2.3) 10 (5) 10 (5) 15 (7) (16) 55 (25) 55 (25) 55 (25).5-2 ( ) ( ) ( ) 2-5 ( ) 2-5 ( ) 3-7 ( ) 5-9 ( ) 5-9 ( ) 5-9 ( ) D E F G bs (Kg) oz-in (NM) Thickness ing oe ot irce Z ZT

29 nti-ackash s: NTG Series NTG Series adjustabe drag torque/compact size The adjustabe Kerk NTG Series offers a cost effective anti-backash assemby for appications requiring precise positiona accuracy, repeatabiity, and smoothness. The NTG has been deveoped specificay for demanding appications that require zero backash with minima drag torque. With its compact size and no moving components, the NTG can aso be easiy incorporated into customer specified, custom moded parts. n integra part of the NTG design is the abiity to manuay adjust the drag torque setting to match specific requirements of the appication. This drag torque can aso be set at the factory to meet individua customer specifications. This is especiay effective with fine eads. The standard NTG unit utiizes a sef-ubricating poyaceta nut on a precision roed 303 stainess stee screw. End machining to customer specifications and Kerkote TFE screw coating are optiona. NTG Series: NTG 1/4 (6) 5/16 (8) 3/8 (10).52 (13.2) NTG MINI Series see MINI Series Products D Thickness ing oe E.16 (4.0).20 (5.1).20 (5.1) F.143 (3.63).197 (5.00).197 (5.00) ot irce G.750 (28.6) (28.6) bs (Kg) 10 (4.5) 20 (9.1) 20 (9.1) oz-in (NM).5-2 ( ) ( ) ( ) NTI-KLS NUT SSEMLIES NTGT Series: NTGT 1/4 (6) 5/16 (8) 3/8 (10).520 (13.2) (22) 1.2 (30) 1.2 (30) NTG MINI Series see MINI Series Products M* 7/ /4-20 3/4-20 N.250 ().375 ().375 () bs (Kg) 10 (4.5) 20 (9.1) 20 (9.1) oz-in (NM).5-2 ( ) ( ) ( ) * metric avaiabe as required 37

30 Genera Purpose s: FW Series FW Series conventiona stye, without anti-backash function The Kerk FW Series genera purpose free-wheeing nut is for appications not requiring anti-backash and wear compensation. It provides effective power transmission at minimum cost, and features ong ife, sef-ubricating poyaceta nuts. The secure mounting and convenience of a circuar fange is standard on the FW nuts with trianguar fange and thread mounting as an option. Many custom configurations are avaiabe. s are 303 stainess stee with extended ife, custom Kerkote TFE coating optiona. ssembies can be suppied cut-to-ength or with ends machined to customer requirements. FWF Series: (Round) FREE-WEELING and SPEILTY NUTS FWF Round 1/4 (6) 5/16 (8) 3/8 (10) 7/16 1/2 5/8 (16) 3/4 (19) 7/8 (22) 15/16 (24).50 (12.7).63 (15.9).63 (15.9) (22.2) 1.12 (28.4) (38) 1.5 (38) 1.5 (38) 2.0 (51) 2.0 (51) 2.0 (51) D 1.13 (28.7) 1.13 (28.7) 38.1) 1.75 (44.4) 2.25 (57.1) 2.25 (57.1) Thickness ing oe E.19 (4.8).19 (4.8).19 (4.8).19 (4.8).19 (4.8).19 (4.8).25 (6.4).25 (6.4).25 (6.4) F.140 (3.56).140 (3.56).140 (3.56).203 (5.16).203 (5.16).203 (5.16).203 (5.16).203 (5.16).203 (5.16) ot irce G.750 (19.05).875 (22.23).875 (22.23) (28.58) (28.58) (30.18) (36.53) (47.63) (47.63) bs (Kg) 50 (20) 75 (35) 75 (35) 90 (40) 150 (68) 225 (100) 350 (160) 500 (227) 500 (227) FW MINI Series see MINI Series Products 38

31 Genera Purpose s: FW Series FW Series: (Trianguar) FW Trianguar FW MINI Series see MINI Series Products 1/4 (6) 5/16 (8) 3/8 (10) 7/16 1/2.50 (12.7).66 (16.6).66 (16.6) (48.3) 1.9 (48.3) 1.9 (48.3) 1.9 (48.3) D Thickness ing oe E.17 (4.3).17 (4.3).17 (4.3).17 (4.3).17 (4.3) F.143 (3.63).197 (5.00).197 (5.00).197 (5.00).197 (5.00) ot irce G.750 (19.05) (28.58) (28.58) (28.58) (28.58) bs (Kg) 50 (20) 75 (35) 75 (35) 90 (40) 150 (68) FWT Series: FWT 1/4 (6) 5/16 (8) 3/8 (10) 7/16 1/2 5/8 (16) 3/4 (19) 7/8 (22) 15/16 (24).63 (15.9) (51) 2.0 (51) 2.0 (51) M* 9/ /8-18 5/ / / / / / /8-16 N.187 (4.75).250 ().250 ().375 ().375 ().375 ().500 ().500 ().500 () bs (Kg) 50 (20) 75 (35) 75 (35) 90 (40) 150 (68) 225 (100) 350 (160) 500 (227) 500 (227) FREE-WEELING and SPEILTY NUTS FW MINI Series see MINI Series Products * metric avaiabe as required 39

32 Lead-screw ssembies: MINI Series MINI Series miniature stye asembies, with or without anti-backash function The Kerk MINI Series brings aydon Kerk Motion Soutions quaity, precision and vaue to products that were previousy off imits to ead-screw technoogy. To meet a wide range of appications, the MINI Series incudes anti-backash and standard assembies. Using a patented take-up mechanism, the sef-compensating NT maintains axia stiffness throughout its ife whie system torque is hed to a minimum. The NTG aows drag torque to be pre-set according to system requirements. The MINI FW Series is for appications not requiring anti-backash and wear compensation. MINI SERIES LED-SREW & NUTS Mini Series assembies incude 303 stainess stee ead screws, avaiabe with aydon Kerk Motion Soutions proprietary, ong-ife Kerkote TFE coating. the nuts are maintenance free, manufactured with sef-ubricating poyaceta, and designed to run smoothy and efficienty on aydon Kerk Motion Soutions precision roed screws. Perfect for demanding appications, the MINI NT and NTG nuts provide zero backash with drag torque of ess than 1 oz.-in. (some sizes as ow as 0.1 oz.-in.)! Kerk Mini Series Leadscrew ssembies have what it takes for affordabe, precision motion contro, sized to fit and buit to ast. 40

33 Lead-screw ssembies: MINI Series MINI Series: FWR NTR NTGR 1/8 (3) 3/16 (5) 1/8 (3) 3/16 (5) 1/8 (3) 3/16 (5) eight D1 Width D Thickness E 0.13 (3.2) 0.13 (3.2) 0.13 (3.2) 0.13 (3.2) 0.13 (3.2) 0.13 (3.2) Sot Width F (3.05) (3.05) (3.05) (3.05) (3.05) (3.05) ot irce G (15.24) (15.24) (15.24) (15.24) (15.24) (15.24) bs (Kg) (2.3) 5 (2.3) 5 (2.3) 5 (2.3) oz-in (NM) free wheeing free wheeing 0.5 (.004) 0.5 (.004) 0.5 (.004) 0.5 (.004) For 1/4-in diameter screws and arger, pease refer to the individua sections for each nut type. MINI Series: FWT NTT NTGT 1/8 (3) 3/16 (5) 1/8 (3) 3/16 (5) 1/8 (3) 3/16 (5) M* 3/8-24 3/8-24 3/8-24 3/8-24 3/8-24 3/8-24 N (4.75) (4.75) (3.18) (3.18) (4.06) (4.06) bs (Kg) (2.3) 5 (2.3) 5 (2.3) 5 (2.3) oz-in (NM) free wheeing free wheeing 0.5 (.004) 0.5 (.004) 0.5 (.004) 0.5 (.004) MINI SERIES LED-SREW & NUTS * metric avaiabe as required 41

34 Lead-screw ssembies: MIRO Series Micro Lead-screw / ssembies aydon Kerk Motion Soutions, recognized word-wide as a eader in inear motion, has appied their experience and knowedge of precision thread roing to a new range of micro-sized ead-screws. Manufactured of premium grade 303 stainess stee, Kerk Micro Series Lead ssembies provide exceptiona performance, ong ife, and require no maintenance. igh accuracy threads with superior uniformity deiver precise motion and reduce noise and vibration. configurations of sef-ubricating aceta and Kerkite igh Performance omposite Poymers. This remarkabe product ine is an enabing technoogy, opening up a whoe new range of designs. The Micro Series aows the miniaturization of products, reduced power consumption, and weight reduction without sacrificing performance or reiabiity. Deveoped in response to growing demands in many markets, aydon Kerk Motion Soutions has offered micro screws on a custom basis for more than 10 years. Now, avaiabe as a standard product, customers can get quicker, cost effective deiveries. The Micro Series Lead screws are avaiabe as stand-aone components or integrated into the high performance aydon inear actuators. MIRO Series LED-SREWS ode Lead Lead ode Outside * Root * Efficiency % ** (0.30) (2.01) (1.73) () (1.91) (1.47) 30 5/64 (2) (0.50) (1.96) (1.45) () (2.01) () 52 MIRO SERIES LED-SREW & NUTS FW (2.00) (1.96) (1.45) * For Reference ** Theoretica vaues based on uncoated ead-screws FW Stye arre arre Stye MIRO Series Styes 5/64 (2) 0.22 (5.5) 0.32 (8) Fats D bs (Kg) 0.20 (5.08) 10 (4.5) 66 oz-in. (NM) Free Wheeing FWR FW Stye Rectanguar eight D1 5/64 (2) 0.22 (5.5) 0.32 (8) Width D Thickness E Sot Width F ot irce G bs (Kg) oz-in. (NM) 0.22 (5.5) 0.47 (11.9) 0.08 (2.0) 0.07 (1.8) 0.35 (9.0) 10 (4.5) Free Wheeing Rectanguar Stye 42

35 Lead-screw ssembies: ustom s ustom onfigurations In addition to The Kerk standard nut types, modified and compete custom configurations represent a arge portion of the company s production. Modifications may be simpe changes such as different mounting hoe patterns or mounting threads, sma dimensiona changes, or specia materias. aydon Kerk Motion Soutions can provide tremendous vaue by producing a muti-functiona nut. Using custom mods and speciaty machining, nuts can aso incude guide bushings, carriages, timing pueys, gears, syringe components, sensor mounts and fags, encoder features, camps and many other compimentary eements. In addition, custom designed nuts can offer quick reease mounts, partia thread engagement, haf nut construction or specia shapes and geometries. Specia materias are offered to extend the performance of our assembies. Materias can be chosen for extreme temperature, chemica compatibiity, autocaving, agency approvas, specia oadings and many other specific requirements. ustom nut designs can incude muti-functionaity, eiminating additiona components to simpify product manufacturing. This can deiver both cost- and space-saving benefits. FREE-WEELING and SPEILTY NUTS ustom geometries and custom materias can be combined for a wide variety of product appication requirements. 43