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Leadscrew Nuts Leadscrews and Leadscrew Assemblies s d e n i l Section Contents a b s Leadscrew and Nut Assemblies m w - Product Overview ..............................................................Page 7-2 e e s - Selection Guide ..................................................................Page 7-6 r s - Leadscrew Sizes ................................................................Page 7-7 c s - Leadscrew Nuts ..................................................................Page 7-12 A - Modified and Custom Nuts ................................................Page 7-26 d w - Leadscrew End Modifications ..........................................Page 7-27 a e e - Custom Leadscrew End Modifications ............................Page 7-34 r Leadscrew Assemblies L c - Product Overview ..............................................................Page 7-36 s - Leadscrew Linear Slide - RGLS ........................................Page 7-38 d ® - ScrewRail Actuator Assembly - RSRA ............................Page 7-40 a ® - Anti-backlash ScrewRail Actuator Assembly - RSRZ ....Page 7-42 e Technical Information ................................................................Page T7-1 L 7 Product Overview Leadscrew and Nut Assemblies Precise, efficient linear motion Reliance’s leadscrew and nut assemblies provide a flexible, integrated solution for linear motion. N L u Available in a wide choice of leadscrew sizes and nut styles, with options for custom designed nuts and e t a A leadscrew end modifications, the range offers the flexibility to address d s s s a wide variety of requirements. c e r m e w b Leadscrews are provided with leads from 0.3 mm to 92 mm, screw l i & e s diameters from 3 mm to 19 mm and thread lengths of up to 4 metres, making them an effective solution, even for high linear speed applications. They are available in a range of materials and coatings, with a choice of cut or standard interfacing ends, or with the option of custom machined ends. The screw thread form has been specifically designed for long life and quiet operation. It is manufactured using a rolled process, a highly consistent method of production resulting in a cost-effective, quality product. The leadscrew and nut assemblies have been designed specifically for motion control applications, rather than using adaptations of general purpose screws and nuts. There are 11 different leadscrew nut styles, with a choice of mounts and also options for custom-designed nuts. The leadscrew nuts are made from moulded plastic, which enables custom nuts to be produced with features of the drive system, such as bushings, carriages, pulleys and gears, integrated within the nut. This type of custom, multi-functional nut can offer a significant reduction in part count, reducing cost and assembly time in the overall mechanism. The polyacetal nuts have a lubricating additive to provide longer life which, when combined with low friction leadscrew coatings, can extend the life of a standard leadscrew assembly by up to 300%. The assemblies are self-lubricating, making them ideally suited to medical and laboratory applications. With lead accuracies up to 0.0001 mm/mm and positional bi-directional repeatability within 1.5 micron (0.0015 mm) on anti-backlash designs, the leadscrew and nut assemblies are ideal for applications requiring precise, efficient linear motion. Micro dispensing syringe drives Semiconductor microchip production 7-2 Contact us for product information, design support and custom solutions [email protected] +44 (0) 1484 601002 www.reliance.co.uk Product Leadscrews Overview Part number structure LNTGF8 - 0500 - 350MM C A - TFE - LH s e & i l b w e m r e c Nut Series Screw Lead Thread End Leadscrew Thread s s s See pages See pages d Diameter Length Modifications Coatings Direction A a t 7-4 to 7-6 See pages 7-7 to 7-11 See pages See pages Leave blank for no Leave blank for e u L 7-7 to 7-11 7-7 to 7-11 7-27 to 7-35 coating or TFE and standard right-hand N BFE for coated or LH for left-hand, where available See pages Leadscrew materials 7-7 to 7-11 Leadscrews are rolled from a premium grade, corrosion resistant and non-magnetic 303 stainless steel. Other materials are available including 316 and 400 series stainless steel, precipitation hardened steels, aluminium and titanium. These materials are ideally suited for industries such as medical, vacuum, cleanroom, food and human contact, salt spray and cryogenics. Leadscrew coatings Standard leadscrew nuts are manufactured from self-lubricating plastics. We also offer soft TFE and hard BFE low friction coatings for the leadscrew; lubrication to the screw/nut interface occurs by the nut picking up TFE particles from the coating as well as from migration of the internal lubricant from within the plastic nut. We also supply leadscrews with specialist nickel/TFE coatings and offer a choice of coatings used in medium vacuum applications (up to 10 -5 ). Alternatively a BFE coating can be provided. This is a special proprietary hard coating which shares many of the benefits of TFE coating but offers exceptional durability in more aggressive environments and where reduced friction and a permanent coating is desired. Although care should be taken to ensure that chips and voids do not occur in the coating, small voids have been shown to have little effect on the system performance. The lubricant, although solid, has some of the “spreading” ability of fluid lubricants. When machining bearing ends, soft fixtures are recommended to protect the coating. TFE coated screws provide the maximum level of self-lubrication and should not be additionally lubricated or used in environments where oils or other lubricant contamination is possible. Coatings, available for only a small additional cost, give the best results on wear life, coefficient of friction and torque to drive the leadscrew assembly. To select a coating add -TFE or -BFE to the part number shown above. Leadscrew ends Leadscrews are provided with the options of cut ends or a range of standard end modifications suitable for interfacing with ball bearings, circlips, couplings, pulleys and gears. Alternatively custom end modifications can be supported. See pages 7-27 to 7-35 . Contact us for product information, design support and custom solutions 7-3 [email protected] +44 (0) 1484 601002 www.reliance.co.uk Product Overview Leadscrew Nuts N L u e t a A d s s LBF MINI series - Miniature LPX series - Long life LNTG series - Adjustable drag, s c e r nut for applications that do not for applications that do not compact design, anti-backlash m e w b require anti-backlash or wear require anti-backlash or wear nut assembly allows drag l i & e compensation. compensation. torque to be pre-set according s to system requirements. LAB series - Incorporates a LNTB MINI series - Miniature LNTB series - Flexible design, lockable, adjustable sleeve to anti-backlash nut for self-compensating anti-backlash set the drag torque of the nut applications requiring axial nut assembly maintains axial and to provide manual stiffness through life with stiffness throughout its life with backlash control. minimal drag torque. minimum system drag torque. LAF series - Light loads. LAK series - Moderate loads. LWD series - Moderate loads. Precise position accuracy and Delivers increased load An anti-backlash, self-lubricating repeatability. Anti-backlash. capacity and greater axial acetal nut. Compact design stiffness with low drag torque. provides stiffness and accuracy Anti-backlash. for precise positioning. LCM series - Light loads, LAX series - Heavy loads. Custom Design - Specials to compact design. Anti-backlash. Delivers maximum load suit your application. carrying capacity with highest axial and radial stiffness. Anti- backlash. 7-4 Contact us for product information, design support and custom solutions [email protected] +44 (0) 1484 601002 www.reliance.co.uk Product Leadscrew Nuts Overview Alternative nut styles Reliance offers a wide variety of standard nut designs and the matrix Comparative star rating: below is intended as a general guide to help select the most appropriate lll best nut for the application. More detailed technical data is provided on l good pages 7-12 to 7-25. x not applicable s e & i Nut feature matrix l b w e m Nut Nut Style r e c s s Feature LBF LPX LNTG LAB LNTB LAF LAK LWD LCM LAX s d A a t Compactness lll lll lll ll ll ll ll lll lll l e u L Dynamic load capability lll lll ll ll ll l ll ll ll lll N Minimal drag torque x x ll ll ll ll lll ll l lll Vibration damping (horizontal) x x ll lll l lll ll l l ll Vibration damping (vertical) x x l lll l lll l l l l Smoothness of operation l l lll lll ll ll ll ll l ll (printing/scanning) Backlash/wear compensation x x l l lll ll lll lll lll lll capability Ease of user adjustment of x x lll lll l x ll x x ll drag torque/backlash Stiffness (less axial bi- x x ll ll lll ll lll lll lll lll directional compliance) Ability to add modifications lll lll l l lll ll l l l l Ability to manufacture with lll lll ll ll lll ll l l l l custom material Ability to work with finer leads lll lll lll lll ll lll lll lll lll lll <5.08 mm Ability to work with long leads lll lll l lll lll lll lll lll lll lll >25.4 mm Nut mounting options The nuts are available in several different designs including anti-backlash, adjustable anti-backlash, general purpose and miniature. Most nuts are available with a triangular, round or threaded mount. Custom requirements can be supported using specialist mould designs, see page 7-26 Modified and custom nuts All of the nuts can be modified to some degree to help tailor them to specific requirements, alternatively fully customised nuts can be supplied, see page 7-26 .
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