Couplings and Collars Selection Guide The couplings featured in this catalogue have been carefully selected to accoodate varying degrees of shaft misalignment whilst offering minimum distortion of rotation. one coupling provides a universal solution but the selection table below suarises the salient performance features for ease of comparison. Full details for each coupling can be found on the product pages. Coupling Feature Coupling Style Electrically insulating Vibration damping High reliability inherent backlash Torque capacity Misalignment capability Low bearing load ccuracy Price / performance Reli-a-flex Oldham Bellows Flexible disc spring * Membrane Curved jaw Spiral beam Radial tooth Solid Friction clutches *single disc suitable for angular offset only Comparative rating: best worst not applicable please enquire Standard Product Sales : + (0)1 00 + (0)1 01 -
General Overview Reli-a-Flex Couplings The Reli-a-Flex coupling, specifically designed and manufactured by Reliance to: Improve system accuracy The Reli-a-Flex coupling provides excellent kinematic transfer of motion with high torsional stiffness, zero backlash and constant velocity. Extend system life The Reli-a-Flex coupling introduces negligible radial and axial bearing loads, extending system life. Reli-a-Flex flexible shaft couplings, the range: Short or Long type where space is limited type where greater parallel offset and greater accuracy are required Reli-a- Grip The Reli-a-Grip clamp enables Reli-a-Flex coupling to be used to its full potential. Greater torques can be transmitted without the need to use set screws, which can potentially damage the shaft Precision or Micro Precision coupling with outer diameters from 1 to 2 Micro coupling with outer diameters from to Clamp or Set screw Clamp type leaves shafts unmarked Set screw type where higher speeds are required Please enquire Electrically insulated Protects delicate instruments from powered drive vailable with selected bores on type aluminium couplings, sizes 20 and 2 Please enquire Custom designs Predictable performances vailable with outer diameters from to 0 lternative materials may be specified Please enquire Patented Reli-a-Flex UK Number 217 US Number,20,7 B1 European Number EP 09221 B1 Japanese Number,0,227 - Standard Product Sales : + (0)1 00 + (0)1 01
Reli-a-Flex Couplings General Overview Picture perfect scanning with Reli-a-Flex coupling: With the latest advances in digital optical scanning speed, professional flatbed scanner manufacturers are requiring more accuracy from their drive systems. European company with leading edge technology in drum and flatbed scanners, image setting and integrated media processor products uses Reli-a-Flex couplings in all their flatbed products. With XY technology, speeds of up to 0 scans per hour and resolutions of up to 00 dpi, the accuracy and reliability of the Reli-a-Flex coupling makes it the ideal choice. Prior to the introduction of the Reli-a-Flex coupling slight variations in the speed of the CCD element caused errors when trying to capture high resolution images. These errors manifest themselves as a colour registration defect, which resulted in an unacceptable banding effect across the image. lthough these errors were small (typically.0 microns) they could easily be detected by the naked eye. The cause of these errors was identified as the flatbed drive system. Introduction of a Reli-a-Flex coupling manufactured from low inertia Grade 707-T luminium was instrumental in bringing these registration defects under control. The unique slit pattern with radial rather than spiral slits gives the Reli-a-Flex coupling high torsional stiffness and unsurpassed accuracy. However, with Reli-a-Flex coupling high torsional stiffness does not mean high bearing loads, the Reli-a-Flex coupling slit pattern has been carefully designed to give low bearing loads in conjunction with its high torsional stiffness. lso, being tested to 0 million cycles at rated torque, the Reli-a-Flex coupling is ideal for high duty cycle applications such as busy printing and typesetting applications. ll in all the Reli-a-Flex coupling has proved itself to be ideal for accurate positioning and responsive servo systems. Standard Product Sales : + (0)1 00 + (0)1 01 -
1. - Bore Micro Reli-a-Flex Couplings ll dimensions in General tolerances ±0.1 Material: luminium alloy Grade 707-T Finish: locrom 00 ssociated Products Shafts: page 11-2 Bearings: page -1 Leadscrews: page 7-1 Stepper motors: page 2-1 (long type) (short type) number selection table Example :- - -2 Dimensions () Material Size Standard Bore Sizes ØB1 and ØB2 (bore tolerance +0.0/-0.000) 1. 2 2 1. 2 2 O/D ØD.0.0.0.0.0.0 L 9. 11.70 1..0 1.0 17.00 Hub E 2.0.20.00 2.0.20.00 Fitted Screw M1.2* M1. M2 M1.2* M1. M2 imum shaft intrusion when fitted = E+2. * Coupling fitted with stainless steel slotted head set screws. Bores may be left unalocromed. n-standard options, please contact our sales team n-standard bore sizes, including imperial lternative materials Custom designs For in stock items and custom designs refer to pages -1, -1 - Standard Product Sales : + (0)1 00 + (0)1 01
Micro Reli-a-Flex Couplings 1. - Bore Technical specification Material Size Torsional Stiffness /rad.19.70 1.0.0.70 1.1 Radial Compliance microns/n 21.0.0 2.0 79.0 2.0.0 Parallel 0.02 0.0 0.0 0.0 0. 0. Misalignment ngular deg 1.7 2.0 2.0 1.7 2.0 2.0 xial ±0.0 ±0. ±0.17 ±0.0 ±0. ±0.17 Inertia gcm 2 0.0 0.11 0. 0.0 0.1 0. Mass g 0. 1.0 2.0 0.9 1.70.00 Torque and speed capacity Material Size Typical Torque Capacity Reversing n Reversing Peak Speed rpm 0. 0.20 0.0 0. 0.20 0.0 0.1 0.0 0. 0.1 0.0 0. 0.2 0.0 0.7 0.2 0.0 0.7 70,000 0,000,000 2,000 2,000 22,000 Technical features - apply to the whole Reli-a-Flex coupling range Zero backlash, reliable one-piece construction Unique design maximises torsional stiffness without inducing high bearing loads Minimal velocity and positional fluctuations Over 0,000,000 test cycles at rated load and 0% offset without failure Maintenance free Recoended temperature range -0ºC to +0ºC Standard Product Sales : + (0)1 00 + (0)1 01-7
- 20 Bore Reli-a-Flex Precision Couplings Set Screw Type ll dimensions in General tolerances ±0.1 Material: luminium alloy Grade 707-T Finish: locrom 00 ssociated Products Shafts: page 11- Bearings: page -1 Leadscrews: page 7-1 Stepper motors: page 2-1 (long type) (short type) Couplings are chambered for ease of assembly and fitted with stainless steel screws. number selection table Example :- 20 - - Dimensions () Material Size Standard Bore Sizes ØB1 and ØB2 (bore tolerance +0.020/-0.000) 1 1 20 2 0 0 1 1 20 2 0 0 1 1 20 1 1 20 O/D ØD 1.0 1.0 2.0 0.0 0.0 1.0 1.0 2.0 0.0 0.0 L 1.0 19.7 21.0 2.0 0.0.9 0 2.0 2.00.00.00 7.00 Hub E.00.90.0 7.0 9..0.00.90.0 7.0 9..0 Fitted Screw M2. M M M M M M2. M M M M M imum shaft intrusion when fitted = E+2. Bores may be left unalocromed. n-standard options, please contact our sales team Electrically insulated, sizes 20 and 2 n-standard bore sizes, including imperial lternative materials Custom designs Reli-a-Grip clamp design - see page - For in stock items and custom designs refer to pages -1, -1 - Standard Product Sales : + (0)1 00 + (0)1 01
Reli-a-Flex Precision Couplings Set Screw Type - 20 Bore Technical specification Material Size Torsional Stiffness /rad 1 1 20 2 0 0 1 1 20 2 0 0.00 7.00 7.0 17.0 2..20.0 1.00 10.00 21. 1. 0.20 Radial Compliance microns/n 29.2 2.9 2. 1. 1...1 2.0 2.2.0 9.0 Parallel 0.0 0. 0. 0.1 0.20 0.2 0.1 0.20 0.2 0.0 0.0 0.9 Torque and speed capacity Misalignment ngular deg 2. 2..0.0.. 2. 2..0.0.. xial ±0.0 ±0.0 ±0.0 ±0.70 ±0. ±1.2 ±0.0 ±0.0 ±0.0 ±0.70 ±0. ±1.2 Inertia gcm 2 1.1.0. 2.0.0 2 1.. 9.9.0 9.0 70.0 Mass g.7.2 1.2 27.0.9 97.0.. 1.20.0 71.2 1.7 Material Size Typical Torque Capacity Reversing n Reversing Peak Speed rpm 1 1 20 2 0 0 1 1 20 2 0 0 0.0 0.7 1.0 2.0 2.90.0 0.0 0.7 1.0 2.0 2.90.0 0.70 1.1 1.9..0.0 0.70 1.1 1.9..0.0 1.20 1.90.2.20 7. 1.0 1.20 1.90.2.20 7. 1.0 0,000 2,000 20,000 1,000 11,000,00 20,000 17,000 1,000,000,000,00 Technical features - apply to the whole Reli-a-Flex coupling range Zero backlash, reliable one-piece construction Unique design maximises torsional stiffness without inducing high bearing loads Minimal velocity and positional fluctuations Over 0,000,000 test cycles at rated load and 0% offset without failure Maintenance free Recoended temperature range -0ºC to +0ºC Standard Product Sales : + (0)1 00 + (0)1 01-9
- 20 Bore Reli-a-Flex Precision Couplings Clamp Type ll dimensions in General tolerances ±0.1 Material: luminium alloy Grade 707-T Finish: locrom 00 ssociated Products Shafts: page 11-2 Bearings: page -1 Leadscrews: page 7-1 Stepper motors: page 2-1 (long type) (short type) Couplings are chambered for ease of assembly and fitted with stainless steel screws. number selection table Example :- 20C - - Dimensions () Material Size Standard Bore Sizes ØB1 and ØB2 (bore tolerance +0.020/-0.000) 1C 1C 20C 2C 0C 0C 1C 1C 20C 2C 0C 0C 1 1 20 1 1 20 O/D ØD 1.0 1.0 2.0 0.0 0.0 1.0 1.0 2.0 0.0 0.0 ØH 1. 1.0 21. 2.9 2. 1.0 1. 1.0 21. 2.9 2. 1.0 L 1.0 19.7 21.0 2.0 0.0.9 0 2.0 2.00.00.00 7.00 Hub E.00.90.0 7.0 9..0.00.90.0 7.0 9..0 Fitted Screw M1. M2 M2. M M M M1. M2 M2. M M M imum shaft intrusion when fitted = E+2. Bores may be left unalocromed. n-standard options, please contact our sales team Electrically insulated, sizes 20 and 2 Set screw fixing n-standard bore sizes, including imperial lternative materials Custom designs Reli-a-Grip clamp design - see page - For in stock items and custom designs refer to pages -1, -1 - Standard Product Sales : + (0)1 00 + (0)1 01
Reli-a-Flex Precision Couplings Clamp Type - 20 Bore Technical specification Material Size Torsional Stiffness /rad 1C 1C 20C 2C 0C 0C 1C 1C 20C 2C 0C 0C.00 7.00 7.0 177.0 2. 1.20.0 1.00 1.00 22. 0.0 27.0 Radial Compliance microns/n 29.2 2.9 2. 1. 1...1 2.0 2.2.0 9.0 Parallel 0.0 0. 0. 0.0 0.0 0.9 0.1 0.20 0.2 0.0 0.0 0.9 Misalignment ngular deg 2. 2..0.0.. 2. 2..0.0.. xial ±0.0 ±0.0 ±0.0 ±0.70 ±0. ±1.2 ±0.0 ±0.0 ±0.0 ±0.70 ±0. ±1.2 Inertia g.cm 2 1.0 2.9 7. 2.0.0 200.0 1.2.2 9.0 1.0.0 0.0 Mass g..2 1. 27.. 97.2..1 1.7. 72. 1.7 Torque and speed capacity or Material Size Typical Torque Capacity Reversing n Reversing Peak Speed rpm 1C 1C 20C 2C 0C 0C 0. 0. 0.9 1. 2.0.0 0. 0. 1. 2... 0.0 1.2 2..90.0 11.,000,000 7,00,000,00 2,000 Technical features - apply to the whole Reli-a-Flex coupling range Zero backlash, reliable one-piece construction Unique design maximises torsional stiffness without inducing high bearing loads Minimal velocity and positional fluctuations Over 0,000,000 test cycles at rated load and 0% offset without failure Maintenance free Recoended temperature range -0ºC to +0ºC Standard Product Sales : + (0)1 00 + (0)1 01-11
- Bore Reli-a-Flex Precision Couplings Reli-a-Grip Clamp ll dimensions in General tolerances ±0.1 Material: luminium alloy Grade 707-T Finish: locrom 00 ssociated Products Shafts: page 11-2 Bearings: page -1 Leadscrews: page 7-1 Stepper motors: page 2-1 (long type) (short type) Couplings are chambered for ease of assembly and fitted with stainless steel screws. number selection table Example :- 20G - - Dimensions () Material Size Standard Bore Sizes ØB1 and ØB2 (bore tolerance +0.020/-0.000) 1G 1G 20G 2G 1G 1G 20G 2G imum shaft intrusion when fitted = E+2. Bores may be left unalocromed. O/D ØD 1.0 1.0 2.0 1.0 1.0 2.0 ØH 1. 1.0 21. 2.9 1. 1.0 21. 2.9 L 1.0 19.7 21.0 2.0 0 2.0 2.00.00 Hub E.00.90.0 7.0.00.90.0 7.0 Fitted Screw M1. M2 M2. M M1. M2 M2. M n-standard options, please contact our sales team Electrically insulated n-standard bore sizes, including imperial lternative materials. For custom designs refer to page -1 - Standard Product Sales : + (0)1 00 + (0)1 01
Reli-a-Flex Precision Couplings Reli-a-Grip Clamp - Bore Technical specification Material Size Torsional Stiffness /rad 1G 1G 20G 2G 1G 1G 20G 2G.00 70.00 11.00.00.0.00 19.00 227.00 Radial Compliance microns/n 29.2 2.9 2...1 2.0 2.2 Parallel 0.0 0. 0. 0.1 0.1 0.20 0.2 0.0 Misalignment ngular deg 2. 2..0.0 2. 2..0.0 xial ±0.0 ±0.0 ±0.0 ±0.70 ±0.0 ±0.0 ±0.0 ±0.70 Inertia gcm 2 1.0 2.9 7.9 2.0 1.2. 9.0 1.0 Mass g.. 1.9 27... 1.7. Torque and speed capacity or Material Size Typical Torque Capacity Reversing n Reversing Peak Speed rpm 1G 1G 20G 2G 0. 0.7 1.0 2.0 0.0 1.1 1.9. 0.70 1..2.20,000,000 7,00,000 Technical features - apply to the whole Reli-a-Flex coupling range Zero backlash, reliable one-piece construction Unique design maximises torsional stiffness without inducing high bearing loads Minimal velocity and positional fluctuations Over 0,000,000 test cycles at rated load and 0% offset without failure Maintenance free Recoended temperature range -0ºC to +0ºC Standard Product Sales : + (0)1 00 + (0)1 01-1
Custom Designs Reli-a-Flex Precision Couplings Bespoke designs The flexible manufacturing of the Reli-a-Flex allows for effective customisation of the coupling to suit your specific application Special interfaces can be incorporated into your design to allow easier interaction between the coupling and other components within your assembly lternative materials such as PEEK polymer and other plastics are available Reliance engineers can confidently predict the achievable performance of Reli-a-Flex when provided with details of the allowable space envelope. Please refer to diagram below: Customer Enquiry Select from Catalogue Provide allowable space envelope Reli-a-Flex space evaluated Provide performance requirements Reli-a-Flex performance evaluated Standard Coupling Special Coupling -1 Standard Product Sales : + (0)1 00 + (0)1 01
Reli-a-Flex Precision Couplings Stocked Couplings Preferred range of Reli-a-Flex couplings The preferred coupling range is held in stock and available on short delivery at reduced prices. The range is subject to change from time to time, please visit our website at for the latest details. Long type Size -1.-1. --1. Size -2-2 -- Size 1-0.20-0.20 -- Size 1 1-0.20-0.20 1-- 1-- 1C--2 1C-- 1C-- Size 1 1C-- 1C-- 1C-- Size 20 20C-- 20C-- 20C-- 20C-0.20-0.20 20C-0.20-20C-0.20- Size 2 2C-- 2C-- 2C-- 2C-0.20-0.20 2C-0.7-0.7 2C-0.00-0.00 Short type Size -1.-1. --1. Size -2-2 -- Size -- -- Size 1 1-- 1-- 1-0.20-0.20 1C-- 1C-- Size 1 1C-- 1C-0.20- Size 20 20C-- 20C-- 20C-- 20C-- Size 2 2C-- 2C-- 2C-- 2C-- Standard Product Sales : + (0)1 00 + (0)1 01-1