Hepco - PRT Ring Slide & Track System

Transcription

1 Hepco - PRT Ring Slide & Track System Hepco has been solving customer's circular motion problems for years. Building up an indispensable knowledge of applications and clever technical solutions. This knowledge coupled with many months of research and development has resulted in the introduction of a comprehensive range of ring slides and track systems to suit virtually every need. The ring slide and track system products complement Hepco's extensive range of linear motion products enabling customers to choose a single source for all their motion guidance requirements. Benefits (Common) Friction free motion Fully adjustable Tolerant of debris Simple and effective means of lubrication Zero play Works in any plane Tolerant of misalignment Easy to install Benefits (Ring slides and segments) Circular motion control at the periphery where it is needed Large hollow centre to accommodate other components Will track the curvature of cylindrical shapes Easy means of driving available Benefits (Track system) Limitless variety of circuits available Precision positioning possible High stability assured Simple alignment facility provided 255

2 System Composition RING SYSTEMS: A useful range of nine different ring diameter comprising four different sections is available togther with corresponding bearing assemblies. 90 and 180 stock segments are available in each ring size. RINGS Precision ground all over for optimum accuracy and concentricity. Hardened 'V' faces for maximum wear resistance. Soft centre section allows customising. Datum location faces provided both internally and externally. Gearcut option for ease of driving. Through hole fixing or tapped hole fixing. BEARING ASSEMBLY (ECCENTRIC) Provides simple means of adjustment via centre hexagon or socket each end. Eccentric throw is sufficient to enable removal of ring without disassembly. FIXED CENTRE CARRIAGE Low cost mounting platform for your components. May be used with ring, segment, or unidirectional track system of common bend radius. Incorporates lubricators for increased load/life. Accurate overall height. Keyway location facility. Useful fixing holes provided. BLIND HOLE BEARING ASSEMBLY (ECCENTRIC) Two screw fixing direct into mounting surface where access to opposite side is restricted. BEARING ASSEMBLY (CONCENTRIC) Two piece ground bearing with precision clearance. Zero play when system adjusted. High rigidity. Two stud lengths available in each size. Provides datum reference for the system. ADJUSTMENT KEY AND JACKING FACILITY (For use with track system curved segments only) Easy alignment to adjacent straight side. Overcomes minor inaccuracy in positioning. 256

3 System Composition TRACK SYSTEMS: Ring segments combine with straight slides to build into an almost limitless variation of either open or closed circuits. Unidirectional or bidirectional bends can be negotiated depending upon the carriage used. Segments in all standard ring sizes are available in addition to straight slides up to 4 metres in length. LUBRICATOR Provides lubrication to the contact surfaces thereby increasing the load capacity and life. Alternative screw fixing options. Flanged and compact versions available. BLIND HOLE BEARING ASSEMBLY (CONCENTRIC) Screws direction into mounting surface where access to opposite side is restricted. STRAIGHT SLIDES Precision ground on all important faces. Hardened 'V' faces for maximum wear resistance. Soft centre section allows customising. Central keyway provided for ease of location and alignment. Ground datum faces provided both sides as an alternative means of location and alignment. Available up to 4 metres long in most sizes. Unlimited lengths can be achieved by butting. DOWEL PINS Locates in central keyway of straight slide providing easy method of location and alignment. BOGIE CARRIAGE Negotiates 'S' bends and differing bend radii. Large platform for mounting purposes. Adjustable axial/radial swivel bearings lubricated for life. Accurate overall height. Useful fixing holes provided. Factory adjusted to suit track system. SEGMENTS 90 and 180 segments available. Any length segment easily cut from standard size rings. May be used independently or as part of a track system. 257

4 Application Examples SPRAY SYSTEM Spray head mounted on Hepco ring segment, tracks curvature of product. ROTARY ASSEMBLY FIXTURE Hepco ring slide allows friction free manual rotation and provides control and support adjacent to where the load is being applied. SIMPLE PICK AND PLACE UNIT Hepco ring slide allows 360º rotation and support as near to the load as possilbe. The hollow centre is used for routing the services. MOBILE SAW FOR LONG TUBES Motor and saw assembly mounted on carriage, is hand operated around 360º Hepco ring slide to cut tube. LASER ENGRAVER FOR ROTARY PRINT SCREENS Special Hepco ring slide slips over screen tube ensuring integrity of shape. Hinged bearing assembly bracket enables fast load and unload. 258

5 Application Examples BODY SCANNER Imaging head mounted on Hepco ring slides rotates around the patient. Smooth, silent operation and zero play ensures high quality definition. LAMINATING MACHINE Carriages on upper track cooperate with carriages on the lower track to pressure laminate chemical sensitive paper. Hepco track systems permit continuous motion high speed operation and ensure precise alignment. REMOVING FLASH FROM MOULDING Carriage on track system accurately follows the profile of the product. Rigidity of the carriage assembly ensures good quality finish of the trimmed edge. THREE AXIS ASSEMBLY ROBOT Excellent stability and friction free rotation provided by Hepco ring slide ensures smooth rigid movement. MULTI-STATION ASSEMBLY MACHINE Carriages linked by connecting rods are indexed around rectangular path circuit. Zero play and precise positioning enables highly accurate work to take place at each station. 259

6 Assembled Ring System The Hepco Ring system may be used in either complete ring form or as segments. The carriage may be used to run on the ring track (see below) or constructed in order to embrace the complete ring (see page 261) where the bearing assemblies may be placed internally and/or externally. In all cases either the ring or the carriage may be the moving component. Specially developed Hepco 'R' series bearing assemblies have sufficient adjustment to enable complete removal of the ring slide from the carriage (see our website PRT Technical Pages). Slide Ring ~ (see page 264) ± (see page 264) (see page 266) (see pages ) (see page 267) Ref No. A B C D E F G H I J MAX MIN R R R R R R R R R K NOTES: 1. Two lengths of stud are available for each size bearing assembly (see page 264). Choose according to your required carriage thickness. 2. Offset holes in carriage for eccentric bearing assemblies, necessitate adjustment rotation in direction shown. 3. Standard pinions are available from most manufacturers to suit gear drive option slide rings (see page 262) 4. Exact theoretical values have been given for 'Q', 'R' and 'S'. Positional accuracy of dimension 'S' will determine the axis of the ring. Positional accuracy for dimensions 'Q' and 'R' are not normally critical. Holes for bearing assemblies should be reamed to tolerance as per dimension 'R' on page

7 Assembled Ring System When using rings as shown below it is recommended that two concentric bearing assemblies should be placed 120 apart in order to provide a datum reference. The other bearing assemblies used should be the eccentric type. All eccentrics may be used where positional adjustment of the ring is required. One or more lubricators may be fitted at convenient positions to take advantage of the increased load/life afforded by lubrication (see technical section pages ). (see page 265) (see page 264) (see page 264) Drilling Position (see note 4) ±0.025 ±0.2 ±0.2 ±0.2 ±0.2 (see page 266) (see page 264) Slide Ring L M N O P Q R S T U V W X Ref No R R R R R R R R R Ordering Details: Simply list the components required and if relevant, bracket those you wish to be factory assembled. Example: 1 X R R Ring Segment (see pages ) ASSEMBLED{ 1 x FCP Fixed Centre Carriage (see page 267) 261

8 Slide Rings & Segments Hepco 'R' series slide rings are manufactured from high quality steel, zone hardened on the v edges and precision ground all over with datum register faces provided both internally and externally for ease of location. Gear drive options are available with teeth machined into either the internal or external register face. The number of teeth on the standard external option is divisible by 12 in order to provide maximum choice of pinion size for exact ratio requirements. Customers may also choose the tapped hole option 'N' which enables the slide ring to be bolted from below. Slide Ring Section X-X Standard Gear Drive Option 'P' (External) 'O' Chamfer x 45 (Internal & External) Special Gear Drive Option 'Q' (Internal) Tapped Hole Option 'N' 262

9 Slide Rings & Segments Hepco 'R' series ring segments are cut from complete 360 slide rings, and are available in nominal 90 and 180 segments. Any length segment can be cut to customer's special order and additional holes drilled as required. Although suitable for most applications, slight out of roundness and flatness may be experienced with slide rings and segments in their free unmounted condition. This may be overcome by installing against a register and bolting to a flat surface. Socket cap Part ±0.2 JS6 ~ ±0.025 head screw Number A B C D D1 E F G H I J K L M ISO 4762 (see note 2) N R ± ±0.037 REF x M3* M4x0.7 R ± ±0.037 REF x M3* M4x0.7 R ± ±0.039 REF x M5 M8x1.25 R ± ±0.041 REF x M5 M8x1.25 R ± ±0.044 REF x M5 M8x1.25 R ± ±0.046 REF x M6 M8x1.25 R ± ±0.048 REF x M6 M8x1.25 R ± ±0.051 REF x13 14 M12 M16x2 R ±0.028 ± REF x13 14 M12 M16x2 Holes within ±0.2 External Gear Internal Gear Stock Segments of True Position (see note 1) Part O P MOD No. of Teeth No. of Teeth No. of Holes Mass-kg (R=360 ) Q MOD (R=360 ) R (R=360 ) S T U V (R=360 ) Number R R R R R R R R R Notes: 1. Standard ring segments will be slightly less and 90 and 180 because of the cutting allowance. Full 90 and 180 segments can be supplied to customer's special order. 2. Socket head cap screws ISO 4762 will protrude 1mm above the surface of the R12 section slide rings. Customers requiring screws to be flush should use low head type DIN7984, available from Hepco upon request. Ordering Details: Example: R ( R360)-( R180)-( R90)-( P)-( Q)-( N) Tapped hole option 'N' Internal gear drive option 'Q' External gear drive option 'P' 90 segment 180 segment Full 360 ring slide Part number 263

10 Bearing Assemblies Two basic bearing assembly options are available, the standard economy through fixing type which requires access to the retaining nut on the opposite side of the mounting plate, and the blind hole fixing type for use where access to the opposite side is denied. The through fixing type is available in two stud lengths to cater for most applications, the short stud version being compatible with the Hepco carriage plates. All bearing assemblies incorporate Hepco high precision ball races for durability, rigidity and friction free running. The bearings are greased for life and are supplied dust shielded as standard or neoprene sealed upon request. Bearing assemblies are available in concentric form to provide a datum reference and in eccentric form for ease of system adjustment. Through Fixing Type (RSJ/RLJ) SHORT STUD (RSJ) SOCKET TOOL LONG STUD (RLJ) For use with ECCENTRIC (E) (see note 4) CONCENTRIC (C) (see note 4) ADJUSTING WRENCH ±0.025 RSJ RLJ RSJ RLJ Ring/Slide Section Part Number (see note 6) A B B1 C C C1 C1 RSJ/RLJ-13-C/E / BHJ-13-C/E R 12/TNMS RSJ/RLJ-25-C/E / BHJ-25-C/E R 25/TNS RSJ/RLJ-34-C/E / BHJ-34-C/E R 44/TNM RSJ/RLJ-54-C/E / BHJ-54-C/E R 76/TNL Q R S S1 T T1 T2 U U1 V W X Y M3 x M5 x M6 x M8 x Notes: 1. It is recommended that holes to suit bearing assembly mounting studs should be reamed to tolerance as per dimension 'R', please page Thread form is metric fine. See 'F' dimension in table above. 3. All RSJ/RLJ type eccentric bearing assembly fixing studs are supplied with sockets for adjustment as shown with the exception of the RSJ/RLJ- 13-E. 4. Nuts and washers are supplied with both concentric and eccentric RSJ/RLJ type bearing assemblies. 5. 'R' dimension is both the eccentric offset of the adjusting nut and the total adjustment available at the bearing centre line for 360 rotation of the adjusting nut. 6. Each size of bearing assembly has been designed for use with a specific size of ring/slide (see table above). However, any bearing assembly may be used in conjunction with any ring/slide section larger than that for which it was designed if required by the application. Additionally, size 34 bearing assemblies may be used with size 25 ring/slide section and size 54 bearing assemblies may be used with size 44 ring/slide section. ±

11 Bearing Assemblies Studs and fixing nuts are manufactured in 700MPa (45 ton) condition high tensile steel and are supplied chemically blacked. Fastenings used on the eccentric version are bright zinc plated for ease of identification. The eccentric blind hole fixing base/bearing spigot is manufactured from high grade cast steel which together with the steel adjuster nut is supplied chemically blacked. Installation and adjustment of relevant bearing assemblies may be carried out using the Hepco adjusting wrench, alternatively, the Hepco socket tool with standard allen key may be used (see table below for details). Blind Hole Fixing Type (BHJ) ±0.025 C2 D E F G H I J K L M M1 N O P M4 x M8 x M10 x M14 x Adjusting Socket MASS ~g Z Wrench Tool RSJ C/E RLJ C/E BHJ C BHJ E Part Number 8 AT RSJ/RLJ-13-C/E / BHJ-13-C/E 10 AT25 RT RSJ/RLJ-25-C/E / BHJ-25-C/E 14 AT34 RT RSJ/RLJ-34-C/E / BHJ-34-C/E 20 AT54 RT RSJ/RLJ-54-C/E / BHJ-54-C/E Ordering Details: CONCENTRIC (C) Example: 2 x( RSJ)-( RLJ)-( BHJ)-25 -( C)-( E)-( NS) ECCENTRIC (E) X (2 x socket head cap screws ISO 4762 supplied) Quantity Through fixing type with short stud Through fixing type with long stud Blind hole fixing type Neoprene sealed bearings required Adjustable (eccentric) type Concentric type Size reference (~'A' dimension) 265

12 Lubricator The Hepco Lubricator consists of an impact resistant polyacetal plastic moulding, housing a sprung loaded oil impregnated felt wiper and is designed to apply a constant film of oil to the working surfaces of the slide without imposing undue friction. The application of oil significantly increases the load/life of the system. COMPACT TYPE (C) Part Use With Ring Type F Type C Number Segment Type A A1 B C D E LB-12 R/TR LB-25 R/TR LB-44 R/TR LB-76 R/TR J J1 Part F G G1 H I Ø x LENGTH Screw Hole Ø K L M N O Number x 5 M2.5 x 0.45 x LB x 10 M3 x 0.5 x LB x 16 M4 x 0.7 x LB x 22 M5 x 0.8 x LB-76 Notes: 1. 2 x "Plastite" 45 self-tapping cross recessed pan head screws conforming generally to ISO 7049 are supplied with each lubricator for fixing via hole 'J'. Additionally, 2 x cross recessed cheese head screws - DIN84A are supplied with flanged type lubricator for fixing via holes 'J 1'. 2. Replenishment of oil should be carried out via the lubrication point provided using BP Energol GHL68 or similar 68 viscosity EP mineral oil. Ordering Details: OIL LUBRICATION POINT (see note 2) 'J 1' (see note 1) OIL IMPREGNATED FELT WIPER 'J' SCREW SIZE (see note 1) FLANGED TYPE (F) Example: 3 x LB-44 ( F) ( C) Compact Type 'C' Flanged Type 'F' Part Number Quantity 266

13 Fixed Centre Carriage The Hepco fixed centre carriage is designed for use with Hepco track systems of common bend radii without 'S' bends and also for ring slide tracks and segment tracks (see note 1). The geometry has been cleverly devised to enable the carriage to traverse from straight to curve without the necessity for each pair of bearings to independently follow the slide, thus enabling a low cost carriage to be produced. A small amount of play is experienced whilst the bearing assemblies traverse the join between the straight and curve, but this is not detrimental in most applications. The anodised aluminium alloy carriage plate can be manufactured to customer's special length requirements but the bearing assembly mounting hole centres must remain as specified. Each carriage is supplied fully assembled and adjusted to suit the accompanying slide if required. Part USE WITH RING / SEGMENT ±0.1 ±0.1 ± ±0.1 ±0.1 Number TYPE A B B1 C C1 D E F G H I J FCP R/TR FCP R/TR FCP R FCP R/TR FCP R/TR FCP R/TR FCP R/TR FCP R/TR FCP R/TR Mass Part K L M NØ O P Q Ø R S T U V W ~g Number x x M4 x FCP x x M4 x FCP x x M6 x FCP x x M6 x FCP x x M6 x FCP x x M8 x FCP x x M8 x FCP x x M10 x FCP x x M10 x FCP Notes: 1. Fixed centre carriage FCP cannot be used with a track system. 2. Offset holes in carriage for eccentric bearing assemblies necessitate rotation in the direction shown. Ordering Details: Example: Simply specify the quantity and part number required. 6 x FCP

14 Track Systems Hepco track systems provide a unique method of achieving an almost limitless variation of controlled routing. Any number of carriages can be accommodated, either the fixed centre economy type which is suitable for unidirectional bends of the same radius or the bogie type which enables 'S' bends of varying radii to be negotiated and provides a larger platform for mounting purposes. Various drive possibilities exist. The relevant dimensions of individual track system slides are held on record to enable spares and replacements to be supplied. MAXIMUM CARRIAGE PLAY AT JOIN (see note 1) ALL JOINS ADJUSTMENT KEY JACKING SCREW FOR ALIGNMENT Installation Procedure: FIXED CENTRE CARRIAGE (see page 267) TRACK SYSTEM CURVED SEGMENT REF NOTE 2 (see page 270) SEE ORDERING DETAILS SEE ORDERING DETAILS TRACK SYSTEM STRAIGHT SLIDE (see page 269) BOGIE CARRIAGE (see page 271) Hepco track systems are supplied in separate sections ready for installation marked with a system reference number and individual sequence number (see ordering details below). It is recommended that track system slide should be assembled and clamped in position as a complete circuit prior to drilling though all holes and bolting down the straight slides. Final adjustment of the joins should be carried out using the keyway alignment facility provided, ensuring that both jacking screws are subsequently locked and all curved segment fixing screws are tightened. A final stoning of the v faces is necessary to ensure smooth travel across the joins. Notes: 1. With the fixed centre carriage a small amount of play is experienced as each pair of opposing bearing assemblies traverses the join between straight and curve. This is not normally detrimental in most applications. The maximum play acting in the direction of the arrows is shown on PRT Ring Slide & Track System Fixed Centre Carriage Play at Straight/Curve Transition Zones 2. Due to the cutting procedure, Hepco 90 and 180 curved segments are supplied slightly shorter than their theoretical length (see page 270). This is not detrimental to the smoothness of travel across the join, provided installation has been carried out according to procedure (see above). Ordering Details: Simply list the curved segment and straight slide part numbers in sequential order in clockwise direction (see arrows in illustrations), starting at any point according to preference. Viewing plan elevation as per illustrations and travelling clockwise round the circuit. Curved segments should be designated suffix 'C' for clockwise bend and suffix 'A' for anticlockwise bend. The final item should indicate the quantity and part number of the carriages required. Example: 1 x (1)TNM-44-B1020-2xAK (2) TR R180/C (3) TNM-44-B1020-2xAK (4) TR R180/C 6 x FCP Track system straight slide Clockwise curved segment Track system straight slide Clockwise curved segment Fixed centre carriage

15 Track System Straight Slides Hepco track system straight slides are modified straight slides from Hepco's highly acclaimed Generation II system. The slides are manufactured from quality high carbon steel, zone hardened on the 'V' edges then precision ground on the important 'V' faces, register width and mounting face. Additional holes or machining may be carried out in the soft centre portion of the slide if required. Standard lengths are available up to 4020mm (1020mm in the TNMS-12 section) and unlimited lengths can be achieved by butting matched slides together. All track system straight slides are ground square on the ends and marked with a reference number and sequence number for installation and replacement purposes (see pages 268). Opposing slides within a track system are ground to identical lengths. Adjustment keys are available to facilitate alignment with adjacent curved segments (see page 270). Hepco dowel pins positioned at regular intervals along the slide keyway provide a convenient means of location and alignment. Alternatively, the ground datum faces of the slide may be set against a machined register in the mounting surface (see note 4). B (see note 1) Part ~ SEE +0 SOCKET HEAD NOTE CAP SCREW ±0.025 Number A A1 B MAX C D E F ISO 4762 G H H1 I J TNMS x M TNS x M TNM x 6 7 M TNL x M L x 45 (4 positions) SEE m NOTE K6 Mass Part K L MØ N OØ P Q R S T U ~g/100mm Number TNMS TNS TNM TNL-76 Notes: 1. Standard slide lengths are available in multiples of hole pitch 'D' + (2 x 'C') up to a maximum length per 'B' dimension in the table above. Special length slides can be cut to order. 2. Adjustment keys are required at every join between straight slide and curved slide. Please order accordingly (see ordering details). Please note that 'Q' dimension for the TNMS-12 slide is stepped one end to fit keyway 'H'. 3. Please note that dowel pins for the TNMS-12 slide are not stepped. 4. Slides in their free unmounted state are not necessarily straight. They should be set to the required straightness when bolting down to the mounting surface at assembly. 5. Dimensions 'A1' and 'K' will be matched with corresponding dimension 'F' and 'I' page 262 for track system requirements. Ordering Details: ADJUSTMENT KEY (AK) (see note 2) DOWEL PIN (SDP) (see note 3) OØ (hole size) Example: TNM-44 -B1500 -( 2xAK)-( 1xAK)-( 16xSDP) 16 x Dowel pins required 1 x adjustment key required 2 x adjustment keys required Length of slide 'B' mm Part Number 269

16 Track System Curved Segments Hepco track system curved segments are modified from stock 90 and 180 slide ring segments (see pages for dimensions and details). The segment ends are ground square to a specified dimension relative to the true shape of the segment and a clearance keyway and tapped hole facility is incorporated each end to provide a method of alignment when assembled together with the mating key of the track system straight slide (see page 269). An additional fixing hole is provided adjacent to the keyway each end to give extra support at the join position for all segments except the TR12-93 and TR All track system curved segments are marked with a reference number and sequence number (see page 268). ADDITIONAL FIXING HOLE (STANDARD SIZE) CENTRE LINE OF CUT J (socket head set screws ISO 4026 supplied) For all other details and dimensions see pages 262 and 263 Part ~ ±0.2 Number A B C D E F G H I J R TR M2.5 x TR M2.5 x TR M4 x TR M4 x TR M4 x TR M5 x TR M5 x TR M8 x TR M8 x Ordering Details: Example: TR ( R90)-( R180)-( N) Tapped hole option 'N' (see page 262) 180 segment 90 segment Part Number 270

17 Bogie Carriage The Hepco bogie carriage is designed for use with track systems where 'S' bends or bends of varying radii are to be negotiated, or where increased stability due to wide spacing of the bearing assemblies is required. Each bogie swivels on a unique selflubricating axial/radial bearing with adjustable preload facility, enabling it to follow exactly the path of the slideway at all times. The bogie and carriage plate are manufactured in anodised aluminium alloy and the complete carriage is supplied fully assembled and adjusted to suit the accompanying slide. Special size carriages are available upon request. SEE ADJUSTMENT PROCEDURE (b) BOGIE Part USE WITH Mass TRACK SYSTEM ±0.1 ±0.1 ±0.1 ADJUSTMENT Number (SEGMENT TYPE) A B C D E F G H I J K L M N O P BRACE ~kg BCP-12 TR M4 x AB BCP-25 TR M6 x AB BCP-44 TR M8 x AB BCP-76 TR M10 x AB Adjustment Procedure: RSJ TYPE CONCENTRIC BEARING ASSEMBLY (see page 264) RSJ TYPE CONCENTRIC BEARING ASSEMBLY (see page 264) PRELOAD ADJUSTING SCREWS I (6 x FIXING HOLES) BOGIE FIXING SCREW CARRIAGE PLATE a) The preload of the bogie swivel bearings is factory adjusted. However, should it become necessary to readjust, tighten the preload adjusting screws evenly until all play is removed whilst still allowing freedom of rotation of the bogie. A suitable thread locking compound (Loctite 242 or equivalent) must be used when resetting the preload adjusting screws. b) The bearing assemblies are factory adjusted to suit the accompanying slide system. However, should it become necessary to readjust, the carriage must first be removed from the bogies by undoing the fixing screws then the bogies connected together using the Hepco adjustment brace (see table above). The exposed bearing assembly fixing nuts may then be slackened and adjustment effected by rotating the eccentric in direction of arrow shown in accordance with the system adjustment procedure (see Ring Slide & Track System Fixed Centre Carriage Play at Straight/Curve Transition Zones. Bearing assembly adjusting tools are available and are illustrated on page 264. Ordering Details: Simply specify the quantity and part numbers required. Example: 8 x BCP-76 1xAB-76 Bogie carriage Adjustment brace 271

18 Load Capacity and Life Expectancy The load capacity and life expectancy of Hepco ring, segment and track systems will be determined by several factors. These are the size of the ring and the size and number of bearing assemblies used, the presence of lubrication, the magnitude and direction of loads, the speed of operation (see note 2 page 273 ) and the length of the path traversed (see note 3 page 273). It is usual to run systems with less than the maximum load to prolong the life, which can be calculated using the data and formulae in this section. For calculation purposes, Hepco ring slide and track systems fall into two categories, those in which a carriage runs on a ring segment or track, and those in which a ring rotates captivated by a number of bearing assemblies (or similar arrangement where the ring is stationary and the bearing assemblies and load rotate). Wherever possible, Hepco ring and track systems should be lubricated using the Hepco lubricators (see page 266). Such lubrication will greatly increase the load capacity and extend the life of the system (see table below and page 273 and nomograms on pages 273 and 274). Systems With Carriages On Rings, Segments & Tracks When calculating the life, the loading on the system should be resolved into the direct load components L1 and L2 and the moment load components M, MV and M S (see adjacent diagram and refer also to note 2). Maximum Lubricated Load Capacity Maximum Unlubricated Load Capacity Direct Loads (N) Moment Loads (Nm) Direct Loads (N) Moment Loads (Nm) Carriage L1 L2 M Mv Ms L1 L2 M Mv Ms FCP FCP BCP * 1.7* * 1.2* 0.4 FCP FCP FCP BPC * 27* * 10* 3.5 FCP FCP BCP * 75* * 28* 14 FCP FCP BCP * 220* * 86* 55 * See note 1 To calculate the life of a system using a standard carriage, first obtain the load factor LF by entering the values for L 1, L 2, M, MV and Ms in respect of the proposed duty into equation (1) below, together with the maximum load capacities from the table above. M M M L L (1) L F = M MV( MS L1 L2 V S 1 2 (max) max) (max) (max) (max) The life for the system can be read from the nomogram on page 273 (for lubricated systems) or on page 274 (for systems running dry) by taking the life figure on the lower scale opposite the calculated value for LF on the upper scale (see examples on page 274). Notes: 1. If using a bogie type carriage which differs from the standard length, the M and MV moment load capacities will increase pro rata with the increase in the distance between the bogie swivel centres (see dimension 'F' on page 271). 2. When calculating L2 and M S, the centrifugal force must be included, which acts radially outwards from the centre of mass (COM) of the moving objects. Its magnitude is F=DV2/R where V is the velocity of the COM in m/s, R is the distance of the COM from the ring axis in m and D is the mass in kg. F is in N (newtons). 272

19 Systems with Rings Rotating within Enclosing Bearing Assemblies In those duties having a complete ring which rotates in a number of encircling bearing assemblies, it is usual to equally space the bearing assemblies around the ring (see note 1). When calculating the life, the loading on the system should be resolved into the direct load components LA and LRand the moment load component M (see adjacent diagram and refer also to note 2 on page 272). Bearing Used with Number of Maximum Lubricated Maximum Unlubricated Assembly Ring Part Bearing Assemblies Load Capacity Load Capacity Size Number Equally Spaced L A (N) L R (N) M (Nm) L A (N) L R (N) M (Nm) RSJ/BHJ x øc* x øc* R x øc* x øc* R EACH ADDITIONAL x øc* x øc* R x øc* x øc* RSJ/BHJ-25 R x øc* x øc* R EACH ADDITIONAL x øc* x øc* RSJ/BHJ x øc* x øc* R x øc* x øc* R EACH ADDITIONAL x øc* x øc* RSJ/BHJ x øc* x øc* R x øc* x øc* R EACH ADDITIONAL x øc* x øc* *see note 4 *see note 4 To calculate the life of this type of system, first obtain a value for the load factor LF by entering the values for L A, LR and M in respect of the proposed duty, into equation 2 below, together with the maximum load capacities from the table above. M LA L (2) L F = + + M LA( LR (max) max) (max) The life for the system can be read from the nomogram below (for lubricated systems) or on page 274 (for systems running dry) by making the life figure on the lower scale opposite the appropriate value for LF on the upper scale. (See example page 274). Load/life Nomogram For Lubricated Systems Load Factor LF Life (km) Notes: 1. In certain applications in which the bearing assemblies rotate with the load, and this has large LR or M components, it may be beneficial to space the bearing assemblies unequally around the ring. Contact T.E.A. for details. 2. SPEED OF OPERATION. Hepco ring, segment and track systems are rated for speeds of 1m/s without lubrication or 1.5m/s when lubricated. Greater speeds may be tolerated at reduced loads. Contact T.E.A. for details. 3. SHORT STROKE OPERATION. The life of the Hepco ring, segment and track systems will be reduced when the length of the path traversed in each cycle is very short. For path lengths below 0.2m, the life will reduce pro-rata with the path length. e.g. a system with a 0.08m stroke will have its life reduced by a factor of = 0.4 compared to that calculated from the appropriate nomogram. 4. Øc is the contact diameter, i.e. the diameter of the circle which passes through the points of contact between bearing assemblies and the ring. This will be usual to the P.C.D. of the ring ±9, 20, 37 & 64mm for the 12, 25, 44 & 76 sections respectively (depending on whether the bearing assemblies are running on the outside or inside of the ring). R See note 2 on page

20 Load/life Nomogram For Unlubricated Systems Load Factor LF Example 1 A track system consist of: 1 x TR R180/C; 1 x TNM-44- B870-2xAK; 1 x TR R180/C; 1 x TNM-44-B870-2xAK; 1 x FCP The carriage carries a dead weight such that the mass of the load and the carriage together is a total of 40kg whose centre of mass is over the middle of the carriage. The centre of mass is 80mm above the slide V's. The speed of operation is 0.7m/s and the system is lubricated with the Hepco lubricators which are supplied as part of the fixed centre carriage. 2 L 1 = 40kg x 9.81m/s (g) = 392.4N 2 L 2 (centrifugal force see note on page 272 = DV /R) 2 L 2 = 40kg x (0.7m/s) 0.234m = 83.7N M S = L2 x 0.08m = 83.7N x 0.08 = 6.7Nm M V =M=0 Life (km) Load/life Calculation Examples L F = The value of 0.49 for the life factor LF can then be entered into the nomogram for lubricated systems to obtain the linear life. Reading from the nomogram on page 273 we see that the life corresponding to an LF value of 0.49 is 2,900km. Example 2 M MV MS L1 L = = 0.49 M MV MS L1 L (max) (max) (max) (max) (max) L F = An antenna is mounted on a Hepco R ring which rotates in 6 x RLJ-25 bearing assemblies. The system is lubricated with 5 x LB-25 lubricators. The antenna rotates once per second and the mass of the rotating assembly (which includes the ring, platform and the antenna) is 8kg. The centre of mass of the assembly is 100mm from the axis of the ring, and 150mm above the ring V's. The system is required to work on average 36 hours per week. 2 L A = 8kg x 9.81m/s (g) = 78.5N Speed of the centre of mass: 1 rev/s = 2x x0.10m x1 = 0.63m/s 2 2 L R = DV /R = 8kg x (0.63m/s) 0.10m = 31.8N M = LR x h = 31.8N x 0.15m = 4.77Nm From the table on page 273 we find that M (max) = ( x 37) x Øc = 261 x ( ) = 96.8Nm. L A = x150 = 1050N; L R = x100 = 600N. (max) M LA LR = + + = M LA LR (max) (max) (max) PLAN VIEW (max) Reading from the nomogram on page 273 we see that the life corresponding to an LF value of is 39000km. 1 revolution =.351 x = 1.1m Each week the system runs for 3600revs/hour x 36 hours = 143km. System life = = 273 weeks = 5.25 years 274