Precision rolled ball screws - SKF.com

1 Precision rolled ball screws2 ContentsA Recommendations for selectionSKF the knowledge engineering company .. 4 Product overview .. 6 Technical concepts .. 8 Introduction to SKF ball screws .. 8 Basic dynamic load carrying capacity (Ca) .. 8 Nominal fatigue life L10 .. 8 Service life .. 8 Equivalent dynamic load .. 8 Basic static load carrying capacity (Coa) .. 9 Critical rotating speed for screw shafts .. 9 Permissible speed limit .. 9 screw shaft buckling .. 9 Lubrication .. 9 Efficiency and back-driving .. 10 Axial play and preload .. 10 Static axial stiffness of a complete assembly.

2 10 Materials, heat treatment and coatings .. 11 Operating temperature .. 11 ball screw support bearings .. 11 Designing the screw shaft ends .. 11 Critical applications .. 11 Working environment .. 11B Recommendations for assemblyAssembly procedure .. 12 Storage .. 12 Alignment .. 12 Lubrication .. 12 Removing the nut / assembling the nut on the shaft .. 12 Wipers assembly .. 12 Starting-up the screw .. 12C Lead precisionManufacturing Precision .. 14 High Precision rolled ball screws .. 14 Lead Precision .. 15D Product informationSD/BD/SH miniature screws .. 16 SDS/BDS/SHS miniature screws in stainless steel.

3 18SX/BX universal screws .. 20 Dedicated flanges for SX/BX nuts .. 22 SND/BND Precision screws , DIN standard 69051 .. 24 PND preloaded screws , DIN standard 69051 .. 26SN/BN Precision screws .. 28PN preloaded screws .. 30SL/TL long lead screws .. 32 SLT/TLT rotating nut .. 34 Shaft end combinations .. 36 Standard machined ends .. 37 ball screw support bearings .. 42 Examples of customized nuts .. 48 Manufacturing tolerances .. 49 Calculation formulae .. 50E Service range .. 54F Design calculation and inquiry form .. 56 Designation system .. 58G SKF Linear MotionRollers screws , electromechanical cylinders and guiding solutions.

4 593 From one simple but inspired solution to a misalignment problem in a textile mill in Sweden, and fifteen employees in 1907, SKF has grown to become a global industrial knowledge leader. Over the years we have built on our exper-tise in bearings, extending it to seals, me-chatronics, services and lubrication systems. Our knowledge network includes 46 000 employees, 15 000 distributor partners, offices in more than 130 countries, and a growing number of SKF Solution Factories around the world. Research and development We have hands-on experience in over forty industries, based on our employees know-ledge of real life conditions.

5 In addition our world-leading experts and university part-ners who pioneer advanced theoretical research and development in areas includ-ing tribology, condition monitoring, asset management and bearing life theory. Our ongoing commitment to research and devel opment helps us keep our customers at the forefront of their industries. Meeting the toughest challenges Our network of knowledge and experience along with our understanding of how our core technologies can be combined helps us create innovative solutions that meet the toughest of challenges. We work closely with our customers throughout the asset life cycle, helping them to profitably and re spon sibly grow their Solution Factories make SKF knowledge and manu facturing expertise available locally, to provide unique solutions and services to our with SKF IT and logistics systems and application experts, SKF Authorized Distributors deliver a valuable mix of product and application knowledge to customers for a sustainable future Since 2005, SKF has worked to reduce the negative environmental impact from our own operations and those of our suppliers.

6 Our continuing technology development intro duced the SKF BeyondZero portfolio of products and services which improve efficiency and reduce energy losses, as well as enable new technol ogies harnessing wind, solar and ocean power. This combined approach helps reduce the environmental impact both in our own oper ations and in our customers .SKF the knowledge engineering company4 BearingsSKF is the world leader in the design, development and manufacture of high performance rolling bearings, plain bearings, bearing units and maintenanceCondition monitoring technologies and main-tenance services from SKF can help minimize unplanned downtime, improve operational efficiency and reduce maintenance solutionsSKF offers standard seals and custom engineered sealing solutions to increase uptime, improve machine reliability, reduce friction and power losses, and extend lubricant fly-by-wire systems for aircraft and drive-by-wire systems for off-road.

7 Agricultural and forklift applications replace heavy, grease or oil consuming mechanical and hydraulic solutionsFrom specialized lubricants to state-of-the-art lubrication systems and lubrication management ser vices, lubrication solutions from SKF can help to reduce lubrication related downtime and lubricant and motion controlWith a wide assortment of products from actu-ators and ball screws to profile rail guides SKF can work with you to solve your most pressing linear system knowledge your successSKF Life Cycle Management is how we combine our technology platforms and advanced ser vices, and apply them at each stage of the asset life cycle, to help our customers to be more success ful, sustainable and closely with you Our objective is to help our customers improve productivity, minimize main ten-ance, achieve higher energy and resource efficiency, and optimize designs for long service life and reliability.

8 Innovative solutions Whether the application is linear or rotary or a combination of the two, SKF engineers can work with you at each stage of the asset life cycle to improve machine performance by looking at the entire application. This approach doesn t just focus on individual components like bearings or seals. It looks at the whole application to see how each com po nent interacts with the optimization and verificationSKF can work with you to optimize current or new designs with proprietary 3-D model-ing software that can also be used as a vir-tual test rig to confirm the integrity of the design. SKF Life Cycle ManagementDesign and developManufacture and testSpecificationInstall and commissionOperate and monitorMaintain and repairD55 Designation Page d0 Ph mm mm A Recommendations for selectionScrew assembly Type of recirculationProduct overviewSD/BD/SDS/BDSSD/BD/SDS/BDSSD/BDS D/BD/SDS/BDSSD/BD/SDS/BDSSD/BD/SDS/BDSSD /BDSH/SHSSHSHSX/BXSX/BXSX/BXSX/BXSX/BXSX /BXSND/BND/PNDSND/BND/PNDSND/BND/PNDSND/ BND/PNDSND/BND/PNDSND/BND/PNDSND/BND/PND 810101214161661012,720253240506316202532 4050632,5242 4 542 5102312,755 105 105 10 4010105 1055 105 105 1010101618161820SD/BD SDS/BDSSH SHSSX/BXSND/BND/PND.

9 DIN 69051 Internal, by insertsStainless steel optional 1)External, by integrated tubeStainless steel optional 2)Internal, by insertsInternal, by inserts241) except 10 4 R and 16 10 R2) 6 2 R Designation Page d0 Ph mm mm screw assembly Type of recirculationSN/BN/PNSN/BN/PNSN/BN/PNSN/ BN/PNSN/BN/PNSN/BN/PNSN/BN/PNSL/TLSL/TLS LD/TLDSL/TLSL/TLS LT/ T LTS LT/ T LTS LT/ T LTS LT/ T LTFLBU/PLBU/BUFFLBU/PLBU/BUFFLBU/PLBU/BU FFLBU/PLBU/BUFFLBU/PLBU/BUFFLBU/PLBU/BUF FLBU/PLBU/BUF162025324050632532324050253 2405016202532405063555 105 105 10101020 2520 32 403220 405020 2520 32 4020 4050283234SN/BN/PN SL/TL SLD/TLDSLT/TLT rotating nutsBy facesBall screw support bearings FLBU, PLBU, BUFC omplete ball screw assembly with support bearingInternal.

10 By insertsBy faces44A7A Recommendations for selectionLife test benchIntroduction to SKF ball screwsThis catalogue describes SKF expertise, technology and solutions related to Precision rolled ball screws . Thanks to our lengthy experience with manufacturing ball screws and continuous product and process devel-opment, SKF provides customers with preci-sion rolled ball screw solutions that fulfil their most demanding applications in terms of efficiency, Precision , durability and value. In many cases, these ball screws can replace ground ball screws , offering a simi-lar level of performance and Precision at a lower high quality of SKF rolled ball screws is achieved through our dedicated manufac-turing processes, including Precision rolling and specific screws convert rotary motion into linear motion, and vice-versa, and loads are transferred from the screw shaft to the nut through a ball set: in this sense, ball screws relate to general bearing technology.