Screw Assemblies. Ball Screw Assemblies BASA Planetary Screw Assemblies PLSA

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1 Screw Assemblies Ball Screw Assemblies BASA Planetary Screw Assemblies PLSA

2 2 Screw Assemblies Ball Screw Assemblies BASA Ball screw assemblies are the efficient solution for precise conversion of rotary to linear motion. Building on many years of experience and extensive engineering expertise, we have developed a product range that fulfills the most varied requirements. No matter whether you need very high linear speeds, maximum load ratings, or minimum installed length, you will always find the right solution in Rexroth s wide range of manufactured products. To make sure your application runs with the utmost accuracy and operational reliability, the individual components in our range have been precisely matched to one another, so complete assemblies can be put together efficiently. More detailed information from ppage 7 onwards Characteristic features A really varied range, suitable for virtually any requirements Absolutely uniform and stable functioning Especially smooth operation due to optimal ball pick-up and recirculation High load rating due to large number of balls Short nut length Easy installation of the nuts, mounting orientation individually specified Adjustable preloaded single nuts Extensive range comprising various series Matching supplementary individual components such as nut housings and end bearings, including in the form of pillow block units, partly prepared for the installation of suitable motor flanges Planetary screw assemblies PLSA The Planetary Screw Assembly PLSA is an assembly comprising a screw with planets as the rolling elements. It serves to convert rotary motion into linear motion and vice versa. The function principle of a Planetary Screw Assembly is easy to describe, but the range of designs and the requirements for practical applications are many and varied. Planetary Screw Assemblies are designed to transmit high forces and extend the Screw Assemblies product portfolio at the upper end. Planetary Screw Assemblies are screw drives in which threaded rollers (the planets) are housed in a screw nut, their ends being lodged in discs with holes arranged around a pitch circle so that they rotate parallel to the axis of a special screw, causing the nut to move linearly along the screw. More detailed information from page 195 onwards Characteristic features Smooth functioning due to the synchronized movement of the planets Very low noise Long life Compact design High power density Preloaded units available High positioning accuracy and repeatability Low lubricant consumption Bosch Rexroth AG, R ( )

3 Screw Assemblies 3 Ball Screw Assemblies BASA R ( ), Bosch Rexroth AG

4 4 Screw Assemblies Notes General Notes Non-horizontal installation There is no self-locking effect due to the low level of friction between the screw and the nut. The components of the product are designed to last for the product's service life; a major defect may nonetheless arise in exceptional cases, and if the moving part (i.e. the screw assembly nut) is not installed horizontally it may fall off. An additional protection against falling loads is therefore required for non-horizontal installation. Intended Use Rexroth Screw Assemblies are components that are used to convert a rotary motion into a linear motion, and vice versa. Rexroth Screw Assemblies are intended exclusively for use in machines for moving and positioning. The product is intended exclusively for professional use and not for private use. Use for the intended purpose also includes the requirement that users must have read and understood the related documentation completely, in particular the Safety Instructions. Misuse Use of the product in any other way than as described under Intended Use is considered to be misuse and is therefore not permitted. If unsuitable products are installed or used in safety-relevant applications, this may lead to uncontrolled operating statuses in the application which can cause personal injury and/or damage to property. The product may only be used in safety-relevant applications if this use has been expressly specified and permitted in the product documentation. Bosch Rexroth AG will not accept any liability for injury or damage caused by misuse of the product. The risks associated with any misuse of the product shall be borne by the user alone. Misuse of the product includes: the transporting of people General Safety Instructions The safety rules and regulations of the country in which the product is used must be complied with. All current and applicable accident prevention and environmental regulations must be adhered to. The product may only be used when it is in technically perfect condition. The technical data and environmental conditions stated in the product documentation must be complied with. The product must not be put into service until it has been verified that the final product (for example a machine or system) into which the product has been installed complies with the country-specific requirements, safety regulations and standards for the application. Rexroth Screw Assemblies may not be used in zones with potentially explosive atmospheres as defined in the ATEX directive 94/9/EC. Rexroth Screw Assemblies must never be altered or modified. The user may only perform the work described in the Quick User Guide or the Mounting Instructions for Screw Assemblies. The product must never be dismantled. At high travel speeds, a certain amount of noise is caused by the product. If necessary appropriate measures are to be taken to protect the hearing. Special safety requirements in specific sectors (e.g. cranes, theaters, foodstuffs) in laws, directives and standards are to be observed. The following standards must be complied with: ISO 3408 and DIN Bosch Rexroth AG, R ( )

5 Screw Assemblies 5 Directives and Standards Rexroth Screw Assemblies are suitable for dynamic linear applications that are moved and positioned reliably and precisely. The machine tool industry and other sectors must observe a series of standards and directives. These requirements can vary significantly worldwide. It is therefore essential to understand the legislation and standards that apply in each particular region. DIN EN ISO This standard is entitled Safety of machinery General principles for design, risk assessment and risk reduction. It gives a general overview and contains a guide to the major developments governing machines and their intended use. Directive 2006/42/EC The Machinery Directive describes the basic safety and health requirements for the design and manufacture of machinery. The manufacturer of a machine or his authorized representative has a duty to ensure that a risk assessment has been performed in order to determine the health and safety requirements which have to be fulfilled for that machine. The machine must be designed and built with the results of the risk assessment in mind. Ball Screw Assemblies BASA Directive 2001/95/EC This directive covers general safety requirements for any product placed on the market and intended for consumers, or likely to be used by consumers under reasonably foreseeable conditions, including products that are made available to consumers in the context of service provision for use by them. Directive 1999/34/EC This directive concerns liability for defective products and applies to industrially manufactured movables, irrespective of whether they have been incorporated into another movable or into an immovable or not. REGULATION (EC) No. 1907/2006 (REACH) This regulation relates to restrictions on the marketing and use of certain dangerous substances and preparations. Substances means chemical elements and their compounds as they occur in the natural state or as produced by industry. Preparations means mixtures or solutions composed of two or more substances. R ( ), Bosch Rexroth AG

6 6 Screw Assemblies Bosch Rexroth AG, R ( )

7 Ball Screw Assemblies BASA Screw Assemblies 7 Ball Screw Assemblies BASA Ball Screw Assemblies BASA R ( ), Bosch Rexroth AG

8 8 Screw Assemblies Ball Screw Assemblies BASA Changes at a glance Changes at a glance Section entirely on nuts for miniature, speed, standard and high-performance series Tips on: Proper use, misuse, general safety instructions, directives and standards New screw ends Acceptance conditions: Adaptation to DIN or ISO 3408 Screw-in nut ZEV-E-S: higher load ratings, preload possible High-performance series FED-E-B: new sizes: 16x16 / 20x20 / 25x25 / 32x20 / 32x32 Driven nut (FAR-B-S) Driven nut (FAR-B-S): incorporated from the drive units catalog New ordering code BASA 20 x 5R x 3 FEM-E-S T7 R 82Z120 41Z Screws in tolerance grade T3: Lead deviation 0.012/300 mm New, improved tolerance grade for the most demanding requirements. Sole supplier of tolerance grade T3 precision screws Asian series incorporated: Nuts (FEM-E-D, FDM-E-D) Pillow block units (SED-F-Z, SED-L-S, SEE-F-Z) Nut (FEM-E-D) Nut (FEM-E-D) Pillow block units (SED-F-Z) Pillow block units(sed-l-s) Pillow block units (SEE-F-Z) Bosch Rexroth AG, R ( )

9 Ball Screw Assemblies BASA Screw Assemblies Contents 9 Table of contents: Ball screw assemblies Changes at a glance 8 Screws 64 Contents 9 Screw Ends 66 Product Overview 10 Nuts and Nut Housings 10 Screws 12 Bearing 14 Accessories 15 Definition of ball screw assembly 16 Ball Screw Assemblies for All Applications 18 Application Examples 19 Inquiries and Orders 20 Nuts, miniature series 24 Overview of types 24 Flanged Single Nut FEM-E-B 25 Flanged Single Nut FEM-E-S 26 Adjustable-Preload Single Nut SEM-E-S 27 Cylindrical Single Nut ZEM-E-S/ZEM-E-K 28 Screw-in Nut ZEV-E-S 29 Nuts, Speed Series 30 Flanged Single Nut with Recirculation Caps FEP-E-S 31 Nuts, Standard Series 32 Overview of Types 33 Flanged single nut with recirculation caps FSZ-E-S 34 Flanged Single Nut with Recirculation Caps FSZ-E-B 36 Flanged Single Nut FEM-E-S 38 Flanged Single Nut FEM-E-C 40 Flanged Single Nut FEM-E-D 42 Adjustable-Preload Single Nut SEM-E-S 44 Adjustable-Preload Single Nut SEM-E-C 46 Cylindrical Single Nut ZEM-E-S / ZEM-E-K / ZEM-E-A 48 Screw-in nut ZEV-E-S 50 Double Nut with Flange FDM-E-S 52 Double Nut with Flange FDM-E-C 54 Double Nut with Flange FDM-E-D 56 Nuts, High-Performance Series 58 Nuts, High-Performance Series 58 Flanged Single Nut FED-E-B 60 Driven Flanged Single Nut FAR-B-S 62 Accessories 98 Overview 98 Nut Housing MGS 100 Nut Housing MGD 102 Nut Housing MGA 104 Pillow Block Unit SEC-F, aluminum 106 Pillow Block Unit SEC-L, aluminum 108 Pillow Block Unit SES-F, steel 110 Pillow block unit SES-L, steel 112 Pillow Block Unit SEB-F 114 Pillow Block Unit SEB-L 116 Pillow Block Unit SED-F-Z 118 Pillow Block Unit SED-L-S 120 Flange Bearing Unit SEE-F-Z 122 Bearing Unit LAF 124 Bearing Unit LAN 126 Bearing Unit LAD 128 Bearing LAL 130 Slotted Nuts NMA, NMZ and NMG for fixed bearings 132 Assembly tool for slotted nut 133 Housing nut GWR 133 Ball Screw Assembly with Front Lube Unit 134 Measuring Pads 139 Safety Nut 139 Technical Data 140 Technical Notes 140 Acceptance Conditions and Tolerance Grades 142 Preload and rigidity 146 Dynamic drag torque of the seals 152 Mounting 154 Lubrication 158 Grease lubrication 158 Grease lubrication 160 Oil lubrication 166 Relubrication for Driven Nut FAR 171 Lubricants 172 Design calculation and examples 174 Design calculations 174 Critical speed n cr 178 Permissible axial load on screw F c (buckling load) 179 Design of drive unit FAR-B-S 180 Ball Screw Assemblies BASA End Bearings 188 Design Notes, Mounting Instructions 188 Mounting the housing 189 Lubrication of the end bearings 190 Design calculations 191 R ( ), Bosch Rexroth AG

10 10 Screw Assemblies Ball Screw Assemblies BASA Product Overview Nuts and Nut Housings FEM-E-B FEM-E-S ZEM-E-S Nuts Series Miniature Miniature series Size SEM-E-S d 0 x P x D w ZEM-E-K FEM-E-B / FEM-E-S / SEM-E-S / ZEM-E-S / ZEM-E-K / ZEV-E-S Speed series Flanged single nut with recirculation caps FEP-E-S 6 x 1 x x 2 x x 1 x x 2 x x 2.5 x x 2 x x 5 x 2 12 x 10 x 2 ZEV-E-S Page from Standard series Flanged single nut with recirculation caps FSZ-E-S Flanged single nut with recirculation caps FSZ-E-B Flanged single nut FEM-E-S Flanged single nut DIN 69051, T.5 FEM-E-C Flanged single nut JIS B 1192 FEM-E-D Adjustable-preload single nut SEM-E-S Adjustable-preload single nut DIN 69051, T.5 SEM-E-C Cylindrical single nut ZEM-E-S/ZEM-E-K/ZEM- E-A Screw-in nut ZEV-E-S Double nut with flange FDM-E-S Double nut with flange DIN 69051, T.5 FDM-E-C Series Standard Size d 0 x P x D w FEP-E-S Speed FSZ-E-S FSZ-E-B FEM-E-S FEM-E-C FEM-E-D SEM-E-S SEM-E-C ZEM-E-S ZEM-E-K ZEM-E-A ZEV-E-S FDM-E-S FDM-E-C FEM-E-D 16 x 5 x 3 L L L L 16 x 10 x 3 16 x 16 x 3 20 x 5 x 3 L L L L L 20 x 10 x 3 20 x 20 x x 40 x x 5 x 3 L L L L 25 x 10 x 3 25 x 25 x x 5 x 3.5 L L L L 32 x 10 x x 20 x x 32 x x 64 x x 5 x 3.5 L L L L 40 x 10 x 6 L L L L 40 x 12 x 6 40 x 16 x 6 40 x 20 x 6 40 x 40 x 6 50 x 5 x x 10 x 6 50 x 12 x 6 50 x 16 x 6 50 x 20 x x 25 x x 40 x x 10 x 6 63 x 20 x x 40 x x 10 x x 20 x 12.7 High-performance FED-E-B FAR-B-S Double nut with flange JIS B 1192 FDM-E-D L Standard range, right-hand lead Left-hand lead readily available 56 Bosch Rexroth AG, R ( )

11 Ball Screw Assemblies BASA Screw Assemblies Product Overview 11 High-performance series Page Flanged single nut DIN 69051, T.5 FED-E-B 60 Driven flanged single nut FAR-B-S Nut housings MGS for standard series FEP-E-S FSZ-E-S FEM-E-S SEM-E-S FDM-E-S MGD for standard series FSZ-E-B FEM-E-C SEM-E-C FDM-E-C FED-E-B MGA for cylindrical single nut ZEM-E-S ZEM-E-K ZEM-E-A Diameter d0 Lead P A B A B A B 20 A B C A B C A B C A 25 A B A B A B 32 A B C A B C A B C A B C A 40 A B C A B C B B A B C A B C 50 A B A B B A B A B A B 63 A B B B 80 A B B A = MGS B = MGD C = MGA 62 Page Ball Screw Assemblies BASA R ( ), Bosch Rexroth AG

12 12 Screw Assemblies Ball Screw Assemblies BASA Product Overview Screws Precision screw BAS Tolerance grades: T5, T7, T9 Sizes 6 to 12 6x1Rx0.8 6x2Rx0.8 8x1Rx0.8 8x2Rx1.2 8x2.5Rx x2Rx1.2 12x5Rx2 12x10Rx Screw length Page 64 Tolerance grades: T5, T7, T9 Left-hand lead Size 16x5Lx3 20x5Lx3 25x5Lx3 32x5Lx3.5 40x5Lx3.5 40x10Lx Screw length Screws in tolerance grade T3 (longer versions and larger sizes available on request) 16x5Rx3 16x10Rx3 20x5Rx3 25x5Rx3 25x10Rx3 32x5Rx3.5 32x10Rx x20Rx x5Rx3.5 40x10Rx6 40x20Rx Screw length Standard, available at short notice on request Bosch Rexroth AG, R ( )

13 Ball Screw Assemblies BASA Screw Assemblies Product Overview 13 Precision screw BAS Tolerance grades: T5, T7, T9 Page 72 Sizes 16 to 80 16x5Rx3 16x10Rx3 16x16Rx3 20x5Rx3 20x10Rx3 20x20Rx3.5 20x40Rx3.5 25x5Rx3 25x10Rx3 25x25Rx3.5 32x5Rx3.5 32x10Rx x20Rx x32Rx x64Rx x5Rx3.5 40x10Rx6 40x12Rx6 40x16Rx6 40x20Rx6 40x40Rx6 50x5Rx3.5 50x10Rx6 50x12Rx6 50x16Rx6 50x20Rx6.5 50x25Rx6.5 63x10Rx6 63x20Rx6.5 63x40Rx6.5 80x10Rx6.5 80x20Rx Screw length Ball Screw Assemblies BASA Standard, available at short notice on request Maximum length (assembled) on request Screw Ends Page 67 R ( ), Bosch Rexroth AG

14 14 Screw Assemblies Ball Screw Assemblies BASA Product Overview Bearing Pillow block unit SEC-F Page 106 SES-F 110 SEC-L Lead P A A SES-L 8 A A A 112 Diameter d0 12 A A A 16 A A A 20 A B C D E A B C D E A B C D E A B C SEB-F 25 A C D E A C D E A C A B C D E A B C D E A B C D E A B C A B C 40 A B C E A B C E A B C A B C A B C E A B C E 50 A E A E A A A E A A E SEB-L 63 A A A A A SED-F-Z A = SEB-F and SEB-L B = SEC-F and SEC-L C = SES-F and SES-L D = SED-F and SED-L E = SEE-F 118 SED-L-S 120 SEE-F-Z 122 Bosch Rexroth AG, R ( )

15 Ball Screw Assemblies BASA Screw Assemblies Product Overview 15 Bearing Bearing Page LAF Lead P , LAN LAD LAL Diameter d0 Diameter d0 LAF Lead P LAL LAN / LAD 2, Ball Screw Assemblies BASA Accessories Single parts Slotted nut NMA, NMZ Assembly tool Housing nut GWR Page Acceptance conditions Page 142 R ( ), Bosch Rexroth AG

16 16 Screw Assemblies Ball Screw Assemblies BASA Product Overview Definition of ball screw assembly ISO defines a ball screw assembly as follows: A unit consisting of a ball screw shaft, ball nut and balls which is able to convert rotary motion into linear motion, and vice versa. The basic functioning of a ball screw assembly is easy to describe, but there are numerous different designs and requirements for practical applications. Several innovations and adaptations have contributed to the extension of the product portfolio. Rexroth ball screw assemblies provide designers with diverse solutions for transport and positioning tasks with driven screws or with driven nuts. At Rexroth you will be sure to find exactly the kind of tailor-made products you need for special applications. The nuts with flange in the standard series are available in versions with Rexroth, DIN, or JIS mounting dimensions. In order to make it easier in future for customers to decide between particular series and/or sizes in terms of delivery time too, we have introduced A, B and C categories for nuts. Each individual nut part number is assigned to a particular category. A parts (GoTo Europe Focused Delivery Program) Category A parts are always stocked to meet average order quantities. B parts (standard range) are continually stocked, whereas enquiries have to be made regarding the availability of C parts. For deliveries within Europe, the GoTo Europe Focused Delivery Program is only available for orders comprising more than a specified number of items. Details of the special delivery periods and the quantities can be found in the GoTo Europe Focused Delivery Program catalog. Almost all single nuts in the version with backlash can be easily mounted on the screw by the customer himself, especially during servicing. In addition, the standard series adjustable-preload single nut allows the customer to carry out preload adjustment in-house. Matching nut housings for the Standard series and several types of end bearings are also stocked. Precision screws in a variety of sizes and of unequaled quality have long been an essential part of our product range. Our comprehensive, worldwide stocks guarantee fast response times in every location. Availability is one advantage, low prices another. Every nut featured in this catalog can be combined with the precision screws. Precision screws can also be supplied without ball nuts to allow customers to machine the screw ends on their own facilities. For special servicing cases, please consult us. Calculation software and product configuration tool The Linear Motion Designer (LMD) calculation software is used for designing and calculating ball screw assemblies BASA. The CAD model is created via the product configuration tool. This can be accessed via the Rexroth Onlineportal / econfigurator and Tools. This online configuration tool makes it possible to visually configure ball screw assemblies quickly to match the specific requirements in each case. The tool automatically checks the plausibility of changed parameters. The link to the eshop means that ball screw assemblies can be directly ordered at any time of day or night. Bosch Rexroth AG, R ( )

17 Ball Screw Assemblies BASA Screw Assemblies Product Overview 17 Ball Screw Assemblies BASA Advantages Smooth functioning due to the principle of internal recirculation Especially smooth running due to the optimal pick-up of balls from the raceway Adjustable-preload single nut High load rating due to large number of balls Short nut length No protruding parts, nut is easily mounted Smooth outer shell Effective, wiping sealing Large range of series available ex stock R ( ), Bosch Rexroth AG

18 18 Screw Assemblies Ball Screw Assemblies BASA Product Overview Ball Screw Assemblies for All Applications Drive units You will find further system solutions in our catalog on Rexroth Drive Units. This catalog contains Ball Screw Assemblies with a protecting housing, including versions with integrated screw supports and matching AC servo motors. To perform particularly demanding positioning tasks we have developed the Integrated Measuring System for Ball Rail and Roller Rail Systems. This enables us to achieve maximum design flexibility and operating precision. Bosch Rexroth AG, R ( )

19 Ball Screw Assemblies BASA Screw Assemblies Application Examples 19 Application Examples Rexroth Ball Screw Assemblies have been successfully implemented worldwide in the following areas: Cutting operations Forming operations Automation and handling Woodworking Electrical and electronics Printing and paper industry Machining center Vertical axis with driven nut Injection molding machines Food and packaging industries Medical technology Textile industry etc. Press brake Ball Screw Assemblies BASA Lathe R ( ), Bosch Rexroth AG

20 20 Screw Assemblies Ball Screw Assemblies BASA Inquiries and Orders Inquiries and Orders All nuts, screws and end machining details can now be defined with the ordering code as a complete precision ball screw assembly. We have taken account of all the existing selection criteria as well as adding new ones. The diversity of possible combinations and specifications is basically limitless. Attention is focused in particular on the definition of end machining details. For many design versions there is a prepared definition, which means that a suitable solution can be devised for virtually any application. If you wish to send us an inquiry, simply complete the form at the end of this catalog. If you submit a manufacturing drawing as a CAD file in Pro/E, STEP or DXF, you can the data to us. If the drawing exists on paper only, we will of course accept a scan or a drawing sent by conventional mail. If no drawing is available, please specify your wishes using the variable ordering code. The available options are shown at several places in the catalog. Each customer-specific ball screw assembly is issued with an ID number when an order is placed. For queries or repeat orders, simply quote this number. If you know the specific ordering code you can also easily generate a CAD drawing yourself in numerous file formats via the functionality provided on our website. Rexroth offers an online product configuration tool for this and for directly submitting product requests. To configure specific solutions quickly and easily, simply go to This online tool enables you to visually configure the specific ball screw assembly or planetary screw assembly that you need. You can select any catalog option or any defined product modification. The tool automatically checks the plausibility of changed parameters. Once configuration is complete, 2D and 3D data is available for download in all established formats. As regards end machining, you can choose either standard versions or tailor-made solutions. Rexroth machines the screw ends of the ball screw assembly or planetary screw assembly so that it matches the customer's connecting design and fulfills the desired requirements. The configuration tool which is incorporated into the eshop allows you to obtain a price for customer-specific ball screw assemblies, and also to directly order the product. The screw diameter size that can be selected for ball screw assemblies ranges from 6 to 80 millimeters. In addition, any type of nut can be chosen. Customers who are registered in the eshop can generate manufacturing drawings as well as requesting CAD models. This drawing can then be used directly by our production departments, which accelerates order processing and delivery. What's more, in this case you can order directly in the eshop. In the case of configuration without prior registration, only CAD models are provided. We can refer to this if an order is placed, and use it to produce a manufacturing drawing. Bosch Rexroth AG, R ( )

21 Ball Screw Assemblies BASA Screw Assemblies Inquiries and Orders 21 The ordering code provided on page 22 covers all the parameters of a ball screw assembly. Once you have defined the nominal diameter and lead and entered the total length, the functionality guides you through a succession of dialog boxes allowing you to select the desired options. Nominal diameters, leads Lead P Available ball nut sizes Combinable with VSE Nominal diameter d , Ball Screw Assemblies BASA Overall length L tot of a ball screw assembly Overall length L tot R ( ), Bosch Rexroth AG

22 22 Screw Assemblies Ball Screw Assemblies BASA Inquiries and Orders Identification system for short product names BASA / ordering code Ball Screw Assembly BASA 20 x 5 R x3 FEM-E-C T7 R 81 A Z A Z Ball Screw Assembly Size Nominal diameter (mm) Lead (mm) Direction of lead R right, L left Ball diameter (mm) Ball nut design FEM-E-B Flanged single nut Miniature series FEP-E-S Flanged single nut and recirculation caps FSZ-E-S Flanged single nut and recirculation caps FSZ-E-B Flanged single nut and recirculation caps FEM-E-S Flanged single nut FEM-E-C Flanged single nut DIN 69051, Part 5 FEM-E-D Flanged single nut JIS B 1192 SEM-E-S Adjustable-preload single nut SEM-E-C Adjustable-preload single nut DIN 69051, Part 5 ZEM-E-S Cylindrical single nut ZEM-E-K Cylindrical single nut ZEM-E-A Cylindrical single nut ZEV-E-S Screw-in nut FDM-E-S Double nut with flange FDM-E-C Double nut with flange DIN 69051, Part 5 FEM-E-D Double nut with flange JIS B 1192 FED-E-B Flanged single nut FAR-B-S Driven flanged single nut Number of ball track turns in the nut Nut rework 00 no rework 01 additional surface (B flange) 4) Seal 0 no seals 2 1) reinforced seal 1 standard seal 3 2) low-friction seal Preload 0 standard backlash 4 10% (double nut) 1 reduced backlash 5 7% (double nut) 2 3) 5% (single nut) 6 3% (single nut) 3 2% (single nut) Precision T3, T5, T7, T9 Screw R... Precision BAS Left screw end Form: standard form A with wrench flat on the ball screw B with wrench flat on the collar Option (machining of end face) Z centering per DIN 332-D S hex socket G female thread K none Version: standard version Right screw end... see left screw end Overall length [mm] Documentation 0 Standard (acceptance test report) 2 Torque test report 1 Lead test report 3 Lead and torque test report Lubrication 0 preserved 1 preserved and nut with basic greasing 3 Front Lube Unit on right, ball nut with basic greasing 2 Front Lube Unit on left, ball nut with basic greasing 4 Front Lube Unit at both ends, ball nut with basic greasing 1) only for d 0 25 to 63; consider the higher frictional torque! See page 152 2) see page 152 for sizes 3) only for d 0 16 to 80 4) for FEM-E-C and FDM-E-C with mounting dimensions according to DIN 69051, Part 5 flange type B. Optionally available as a complete ball screw assembly. Bosch Rexroth AG, R ( )

23 Ball Screw Assemblies BASA Screw Assemblies Inquiries and Orders 23 Mounting direction of nut types Definition: The centering diameter on a nut with flange, the slotted nut on a driven nut and the lube bore on a cylindrical nut points to the right end of the screw. Note: The Front Lube Unit is delivered ready-mounted to the Ball Screw Assembly. FEM FDM SEM FSZ Centering diameter D 1 Centering diameter D 1 FED FEP Ball Screw Assemblies BASA ZEV Lube port ZEM Lube port FAR Slotted nut R ( ), Bosch Rexroth AG

24 24 Screw Assemblies Ball Screw Assemblies BASA Nuts, miniature series Nuts, miniature series Miniature series Miniature series ball screw assemblies are available with nominal diameters of 6 12 mm, and leads of 1 10 mm. The nut types are flange, cylindrical and adjustable-preload single nuts as well as screw-in nuts. Overview of types FEM-E-B FEM-E-S SEM-E-S ZEM-E-S ZEV-E-S Bosch Rexroth AG, R ( )

25 Ball Screw Assemblies BASA Screw Assemblies Nuts, miniature series 25 Flanged Single Nut FEM-E-B Rexroth mounting dimensions Flange type B With seals With backlash or reduced backlash With preload for sizes 8 x 2.5 and 12 x 5/10. Tolerance grade: T5, T7, T9 d 0 = nominal diameter P = lead (R = right-hand side) D W = ball diameter i = number of ball track turns Ordering code: BASA 8 x 2R x 1.2 FEM-E-B T7 R 831K062 41K Category Size Part Number Load ratings Linear speed 1) d 0 x P x D w - i dyn. C (N) stat. C 0 (N) v max (m/min) C 6 x 1R x ) R C 6 x 2R x ) R C 8 x 1R x ) R C 8 x 2R x ) R C 8 x 2.5R x R B 12 x 2R x ) R B 12 x 5R x 2-3 R B 12 x 10R x 2-2 R ) See Characteristic speed d 0 n on page 141 and Permissible axial load on screw Fc (buckling load) on page 179 2) Supplied only as complete ball screw assembly. ø 1,5 L 7 D 7 D w 30 D 6 D 1 30 L14 d2 d1 d0 Ball Screw Assemblies BASA Lube port L3 L 4 L D 5 Size (mm) Weight d 1 d 2 D 1 D 5 D 6 D 7 L L 3 L 4 L 7 L 14 m d 0 x P x D w - i g6 (kg) 6 x 1R x x 2R x x 1R x x 2R x x 2.5R x x 2R x x 5R x x 10R x R ( ), Bosch Rexroth AG

26 26 Screw Assemblies Ball Screw Assemblies BASA Nuts, miniature series Flanged Single Nut FEM-E-S Rexroth mounting dimensions With seals With backlash or reduced backlash With preload Tolerance grade: T5, T7, T9 d 0 = nominal diameter P = lead (R = right-hand) D W = ball diameter i = number of ball track turns Ordering code: BASA 12 x 5R x 2 FEM-E-S T7 R 81K060 41K Category Size Part Number Load ratings Linear speed 1) d 0 x P x D w - i dyn. C (N) stat. C 0 (N) v max (m/min) C 8 x 2.5R x R B 12 x 5R x 2-3 R B 12 x 10R x 2-2 R ) See Characteristic speed d 0 n on page 141 and Critical speed n cr on page 178 Lube port 2) at flange center L 10 D 7 D5 D1 D1 0,05 0,1 ϕ D 6 S ϕ D w L 3 L 4 L 6x60 d2 d1 d0 L Size (mm) Weight d 1 d 2 D 1 D 5 D 6 D 7 L L 3 L 4 L 10 S 2) ϕ m d 0 x P x D w - i g6 ( ) (kg) 8 x 2.5R x Ø x 5R x M x 10R x M ) Lube port machining: flat surface L 3 15 mm, for size 8 x 2.5 a DIN 3405 funnel-type lube nipple is provided. Bosch Rexroth AG, R ( )

27 Ball Screw Assemblies BASA Screw Assemblies Nuts, miniature series 27 Adjustable-Preload Single Nut SEM-E-S Rexroth mounting dimensions With seals Adjustable preload Tolerance grade: T5, T7 d 0 = nominal diameter P = lead (R = right-hand) D W = ball diameter i = number of ball track turns Ordering code: BASA 12 x 5R x 2 SEM-E-S T7 R 81K060 41K Ball Screw Assemblies BASA Category Size Part Number Load ratings Linear speed 1) Centering diameter D 1 dyn. C stat. C 0 v max after adjustment d 0 x P x D w - i (N) (N) (m/min) min. (mm) max. (mm) C 8 x 2.5R x R B 12 x 5R x 2-3 R B 12 x 10R x 2-2 R ) See Characteristic speed d 0 n on page 141 and Critical speed n cr on page 178 Lube port 2) at flange center L 5 L 10 4x60 S ϕ D5 D1 +0,7 D1 0,05 D 1 0,1 D 6 D 7 L 3 L L 4 ø6 3,4 D 7 4x60 D w S D5 9 D1 D 6 d2 d1 d0 Version for 8 x 2.5R x L 3 L 4 Size (mm) Weight d 1 d 2 D 1 D 5 D 6 D 7 L L 3 L 4 L 5 L 10 S 2) ϕ m d 0 x P x D w - i f9 ( ) (kg) 8 x 2.5R x Ø x 5R x M x 10R x M ) Lube port machining: flat surface L 3 15 mm, for size 8 x 2.5 a DIN 3405 funnel-type lube nipple is provided. R ( ), Bosch Rexroth AG

28 28 Screw Assemblies Ball Screw Assemblies BASA Nuts, miniature series Cylindrical Single Nut ZEM-E-S/ZEM-E-K 1) Rexroth mounting dimensions With seals With backlash or reduced backlash With preload (except size 12 x 2) Tolerance grade: T5, T7, T9 1) ZEM-E-K / nuts for Rexroth modules and drive units 2) See Characteristic speed d 0 n on page 141 and Permissible axial load on screw Fc (buckling load) on page 179 d 0 = nominal diameter P = lead (R = right-hand) D W = ball diameter i = number of ball track turns Ordering code: BASA 12 x 5R x 2 ZEM-E-S T7 R 81K060 41K Category Size Part Number Load ratings Linear speed 2) d 0 x P x D w - i dyn. C stat. C 0 v max (N) (N) (m/min) C 8 x 2.5R x R B 12 x 2R x R ) B 12 x 5R x 2-3 R B 12 x 5R x 2-3 R ) B 12 x 10R x 2-2 R B 12 x 10R x 2-2 R ) L 11 L 6 A A T 1 D 1 B D 4 0,2 D w d2 d1 d0 L L 7 Lube port Size (mm) Weight d 0 x P x D w - i d 1 d 2 D 1 D 4 L L 6 L 7 L 11 B T 1 m g6 ± P (kg) 8 x 2.5R x x 2R x x 5R x x 5R x x 10R x x 10R x Bosch Rexroth AG, R ( )

29 Ball Screw Assemblies BASA Screw Assemblies Nuts, miniature series 29 Screw-in Nut ZEV-E-S Rexroth mounting dimensions With low-friction seal With backlash, reduced backlash With preload 2% Tolerance grade: T5, T7, T9 d 0 = nominal diameter P = lead (R = right-hand) D W = ball diameter i = number of ball track turns Ordering code: BASA 12 x 5R x 2 ZEV-E-S T7 R 81K060 41K Category Size Part Number Load ratings Linear speed 1) d 0 x P x D w - i dyn. C (N) stat. C 0 (N) v max (m/min) B 12 x 5R x 2-3 R B 12 x 10R x 2-2 R ) See Characteristic speed d 0 n on page 141 and Critical speed n cr on page 178 D 4 L 7 D 8 D w d2 d1 d 0 G1 D 1 Ball Screw Assemblies BASA Lube port Hole for hook wrench L 15 L Size (mm) Weight d 1 d 2 D 1 D 4 D 8 G 1 L L 7 L 15 m d 0 x P x D w - i h10 ±0.3 (kg) 12 x 5R x M20 x x 10R x M20 x R ( ), Bosch Rexroth AG

30 30 Screw Assemblies Ball Screw Assemblies BASA Nuts, Speed Series Nuts, Speed Series Speed series Speed series ball screw assemblies are available with nominal diameters of mm, and leads of mm. The nut type is a flanged single nut. The distinguishing feature of the speed series is its compact design. Multiple-thread screws allow a higher load rating with a short nut. The oversquare leads enable high speeds to be achieved. Bosch Rexroth AG, R ( )

31 Ball Screw Assemblies BASA Screw Assemblies Nuts, Speed Series 31 Flanged Single Nut with Recirculation Caps FEP-E-S Rexroth mounting dimensions With seals With backlash, reduced backlash or preload 2% Tolerance grade: T5, T7, T9 cc Do not exert force on the plastic recirculation caps or allow them to collide with end stops. Note: Supplied only as complete ball screw assembly. d 0 = nominal diameter P = lead (R = right-hand) D W = ball diameter i = number of ball track turns Ordering code: BASA 25 x 25R x 3.5 FEM-E-S T5 R 81K170 41K Category Size Part Number Load ratings Linear speed 1) d 0 x P x D w - i dyn. C (N) stat. C 0 (N) v max (m/min) C 20 x 40R x R C 25 x 25R x R C 32 x 32R x R C 32 x 64R x R ) See Characteristic speed d 0 n on page 141 and Critical speed n cr on page 178 L K L 8 6,6 M6 D 6 30 D K D1 D K D5 6x60 L 3 L L 4 L K D w d2 d1 d 0 Ball Screw Assemblies BASA Lube port Plastic recirculation cap Plastic recirculation cap Size (mm) Weight d 1 d 2 D 1 D 5 D 6 D K L L 3 L 4 L 8 L K m d 0 x P x D w - i g6 ±0.5 (kg) 20 x 40R x x 25R x x 32R x x 64R x R ( ), Bosch Rexroth AG

32 32 Screw Assemblies Ball Screw Assemblies BASA Nuts, Standard Series Nuts, Standard Series Standard series ball screw assemblies are available with nominal diameters of mm, and leads of 5 40 mm. The nut types are flange, cylindrical and adjustable-preload single nuts, double nuts with flange, as well as screw-in nuts. Advantages High axial load-bearing capacity High dynamics High rigidity Low friction Available from stock in many versions and sizes Nut housing with reference edge (both sides) Bosch Rexroth AG, R ( )

33 Ball Screw Assemblies BASA Screw Assemblies Nuts, Standard Series 33 Overview of Types FSZ-E-S FSZ-E-B FEM-E-S Ball Screw Assemblies BASA FEM-E-C FEM-E-D SEM-E-S SEM-E-C ZEM-E-S ZEV-E-S FDM-E-S FDM-E-C FEM-E-D R ( ), Bosch Rexroth AG

34 34 Screw Assemblies Ball Screw Assemblies BASA Nuts, Standard Series Flanged single nut with recirculation caps FSZ-E-S Rexroth mounting dimensions With seals With backlash, reduced backlash, preload 2%; 3%; 5% Tolerance grade: T3 2), T5, T7, T9 cc Do not exert force on the plastic recirculation caps or allow them to collide with end stops. cc When setting up applications, do not allow components to collide with the Front Lube Unit. Ordering code: BASA 20 x 5R x 3 FSZ-E-S T7 R 81K120 41K d 0 = nominal diameter P = lead (R = right-hand) D W = ball diameter i = number of ball track turns Category Size Part Number Load ratings Linear speed 1) d 0 x P x D w - i dyn. C (N) stat. C 0 (N) v max (m/min) B 20 x 5R x 3-4 R B 25 x 5R x 3-4 R B 25 x 10R x 3-4 R B 32 x 5R x R B 32 x 10R x R B 32 x 20R x R B 40 x 5R x R B 40 x 10R x 6-4 R B 40 x 20R x 6-3 R ) See Characteristic speed d 0 n on page 141 and Critical speed n cr on page 178 2) Tolerance grade T3 for sizes shown in table on page 12 Bosch Rexroth AG, R ( )

35 Ball Screw Assemblies BASA Screw Assemblies Nuts, Standard Series 35 Plastic recirculation cap Lube port at flange center D 7 S D K L K D 1 +0,7 L 5 L 3 L 4 L D1 L 10 L K D K D 1 0,1 0,05 D 5 D 6 Plastic recirculation cap 6x60 D w 30 d2 d1 d 0 Ball Screw Assemblies BASA Size (mm) Weight d 1 d 2 D 1 D 5 D 6 D 7 D K L L 3 L 4 L 5 L 10 L K S m d 0 x P x D w - i g6 ±0.5 (kg) 20 x 5R x M x 5R x M x 10R x M x 5R x M x 10R x M x 20R x M x 5R x M8x x 10R x M8x x 20R x M8x R ( ), Bosch Rexroth AG

36 36 Screw Assemblies Ball Screw Assemblies BASA Nuts, Standard Series Flanged Single Nut with Recirculation Caps FSZ-E-B Mounting dimensions similar to DIN 69051, Part 5 flange type B With seals With backlash, reduced backlash, preload 2%; 3%; 5% Tolerance grade: T3 2), T5, T7, T9 cc Do not exert force on the plastic recirculation caps or allow them to collide with end stops. cc When setting up applications, do not allow components to collide with the Front Lube Unit. Ordering code: BASA 20 x 5R x 3 FSZ-E-B T7 R 81K120 41K d 0 = nominal diameter P = lead (R = right-hand) D W = ball diameter i = number of ball track turns Category Size Part Number Load ratings Linear speed 1) d 0 x P x D w - i dyn. C (N) stat. C 0 (N) v max (m/min) B 20 x 5R x 3-4 R B 25 x 5R x 3-4 R B 25 x 10R x 3-4 R B 32 x 5R x R B 32 x 10R x R B 32 x 20R x R B 40 x 5R x R B 40 x 10R x 6-4 R B 40 x 20R x 6-3 R ) See Characteristic speed d 0 n on page 141 and Critical speed n cr on page 178 2) Tolerance grade T3 for sizes shown in table on page 12 Bosch Rexroth AG, R ( )

37 S Ball Screw Assemblies BASA Screw Assemblies Nuts, Standard Series 37 Plastic recirculation cap Lube port at flange center D 7 D K L K D 1 +0,7 L 5 L 3 L 4 L D1 D 1 0,1 0,05 L 10 D w L K d2 D K D 5 d1 d 0 Plastic recirculation cap D 7 D 5 S D 6 22,5 30 L 9 L9 BB2 BB1 Ball Screw Assemblies BASA D 6 D 5 Size (mm) Weight d 1 d 2 D 1 D 5 Hole pattern D 6 D 7 D K L L 3 L 4 L 5 L 9 L 10 L K S m d 0 x P x D w - i g6 ±0.5 (kg) 20 x 5R x BB M x 5R x BB M x 10R x BB M x 5R x BB M x 10R x BB M x 20R x BB M x 5R x BB M8x x 10R x BB M8x x 20R x BB M8x R ( ), Bosch Rexroth AG

38 38 Screw Assemblies Ball Screw Assemblies BASA Nuts, Standard Series Flanged Single Nut FEM-E-S Rexroth mounting dimensions With seals With left-hand thread in some versions With backlash or reduced backlash Preload 2%, 3% or 5% Tolerance grade: T3 2), T5, T7, T9 Note: The Front Lube Unit is only available for right-hand screw threads. cc When setting up applications, do not allow components to collide with the Front Lube Unit. d 0 = nominal diameter P = lead (R = right-hand, L = left-hand) D W = ball diameter i = number of ball track turns Ordering code: BASA 20 x 5R x 3 FEM-E-S T7 R 82Z120 41Z Category Size Part number Load ratings Linear speed 1) dyn. C stat. C 0 v max d 0 x P x D w - i (N) (N) (m/min) A 16 x 5R x 3-4 R A 16 x 10R x 3-3 R A 16 x 16R x 3-2 R A 20 x 5R x 3-4 R A 20 x 10R x 3-4 R A 20 x 20R x R A 25 x 5R x 3-4 R A 25 x 10R x 3-4 R A 25 x 25R x R A 32 x 5R x R A 32 x 10R x R A 32 x 20R x R A 32 x 32R x R A 40 x 5R x R A 40 x 10R x 6-4 R A 40 x 10R x 6-6 R A 40 x 20R x 6-3 R A 40 x 40R x 6-2 R B 50 x 5R x R B 50 x 10R x 6-6 R C 50 x 16R x 6-6 R B 50 x 20R x R B 50 x 40R x R B 63 x 10R x 6-6 R B 63 x 20R x R B 63 x 40R x R C 80 x 10R x R C 80 x 20R x R Versions with left-hand lead B 16 x 5L x 3-4 R B 20 x 5L x 3-4 R B 25 x 5L x 3-4 R B 32 x 5L x R B 40 x 5L x R B 40 x 10L x 6-4 R ) See Characteristic speed d 0 n on page 141 and Critical speed n cr on page 178 2) Tolerance grade T3 for sizes shown in table on page 12 Bosch Rexroth AG, R ( )

39 Ball Screw Assemblies BASA Screw Assemblies Nuts, Standard Series 39 Lube port 3) at flange center L 10 BB3 BB4 BB5 D 7 D 7 D 7 S S D5 D 1 +0,7 L 3 L 5 D1 L 4 L L 3 L 0,05 0,1 D1 D1 L 4 BF1 D 6 Lube port 3) at flange center BF2 4x90 ϕ D w D 6 d2 d1 d0 6x60 ϕ D 6 S 8x45 ϕ Ball Screw Assemblies BASA 3) Lube port machining: flat surface L 3 15 mm, countersink L 3 > 15 mm; Size (mm) Weight d 1 d 2 D 1 D 5 Hole pattern D 6 D 7 Type L L 3 L 4 L 5 L 10 S 3) ϕ m d 0 x P x D w - i g6 ( ) (kg) 16 x 5R x BB BF M x 10R x BB BF M x 16R x BB BF M x 5R x BB BF M x 10R x BB BF M x 20R x BB BF M x 5R x BB BF M x 10R x BB BF M x 25R x BB BF M x 5R x BB BF M x 10R x BB BF M x 20R x BB BF M x 32R x BB BF M x 5R x BB BF M8x x 10R x BB BF M8x x 10R x BB BF _ 75 M8x x 20R x BB BF M8x x 40R x BB BF M8x x 5R x BB BF M8x x 10R x BB BF M8x x 16R x BB BF M8x x 20R x BB BF M8x x 40R x BB BF M8x x 10R x BB BF M8x x 20R x BB BF M8x x 40R x BB BF M8x x 10R x BB BF M8x x 20R x BB BF M8x Versions with left-hand lead 16 x 5L x BB BF M x 5L x BB BF M x 5L x BB BF M x 5L x BB BF M x 5L x BB BF M8x x 10L x BB BF M8x R ( ), Bosch Rexroth AG

40 40 Screw Assemblies Ball Screw Assemblies BASA Nuts, Standard Series Flanged Single Nut FEM-E-C Mounting dimensions similar to DIN 69051, Part 5 Flange type C (flange type B available. See ordering code p. 22) With seals With left-hand thread in some versions With backlash, reduced backlash, preload 2%; 3% or 5% Tolerance grade: T3 2), T5, T7, T9 Note: The Front Lube Unit is only available for right-hand screw threads. cc When setting up applications, do not allow components to collide with the Front Lube Unit. d 0 = nominal diameter P = lead (R = right-hand, L = left-hand) D W = ball diameter i = number of ball track turns Ordering code: BASA 20 x 5R x 3 FEM-E-C T7 R 82Z120 41Z Category Size Part number Load ratings Linear speed 1) d 0 x P x D w - i dyn. C (N) stat. C 0 (N) v max (m/min) A 16 x 5R x 3-4 R A 16 x 10R x 3-3 R A 16 x 16R x 3-3 R A 20 x 5R x 3-4 R A 20 x 10R x 3-4 R A 20 x 20R x R A 25 x 5R x 3-4 R A 25 x 10R x 3-4 R A 25 x 25R x R A 32 x 5R x R A 32 x 10R x R A 32 x 20R x R A 32 x 32R x R A 40 x 5R x R A 40 x 10R x 6-4 R A 40 x 10R x 6-6 R A 40 x 12R x 6-4 R A 40 x 16R x 6-4 R B 40 x 20R x 6-3 R B 40 x 40R x 6-3 R C 50 x 5R x R B 50 x 10R x 6-6 R B 50 x 12R x 6-6 R B 50 x 16R x 6-6 R B 50 x 20R x R B 50 x 40R x R C 63 x 10R x 6-6 R C 63 x 20R x R B 63 x 40R x R C 80 x 10R x R B 80 x 20R x R Versions with left-hand lead B 16 x 5L x 3-4 R B 20 x 5L x 3-4 R B 25 x 5L x 3-4 R B 32 x 5L x R B 40 x 5L x R B 40 x 10L x 6-4 R ) See Characteristic speed d 0 n on page 141 and Critical speed n cr on page 178 2) Tolerance grade T3 for sizes shown in table on page 12 Bosch Rexroth AG, R ( )

41 0 Ball Screw Assemblies BASA Screw Assemblies Nuts, Standard Series 41 Lube port at flange center 3) L 10 BB2 d 0 32 BB1 d 0 40 D 7 D 7 S 5) S 5) D 5 D1 L 3 L 4 D w L 0,05 D 1 0,1 d 0 d1 d2 9 0 D 6 22,5 L D 6 30 L 9 Ball Screw Assemblies BASA 3) Lube port machining: flat surface L 3 15 mm, countersink L 3 > 15 mm; Size (mm) Weight d 1 d 2 D 1 D 5 Hole pattern D 6 D 7 L L 3 L 4 L 4) 9 L 10 S 3) m d 0 x P x D w - i g6 (kg) 16 x 5R x BB M x 10R x BB M x 16R x BB M x 5R x BB M x 10R x BB M x 20R x BB M x 5R x BB M x 10R x BB M x 25R x BB M x 5R x BB M x 10R x BB M x 20R x BB M x 32R x BB M x 5R x BB M8x x 10R x BB M8x x 10R x BB M8x x 12R x BB M8x x 16R x BB M8x x 20R x BB M8x x 40R x BB M8x x 5R x BB M8x x 10R x BB M8x x 12R x BB M8x x 16R x BB M8x x 20R x BB M8x x 40R x BB M8x x 10R x BB M8x x 20R x BB M8x x 40R x BB M8x x 10R x BB M8x x 20R x BB M8x Versions with left-hand lead 16 x 5L x BB M x 5L x BB M x 5L x BB M x 5L x BB M x 5L x BB M8x x 10L x BB M8x ) Flange type B (two flat surfaces) option available! 5) With left-hand lead the lube port position mirrors its position with right-hand lead! R ( ), Bosch Rexroth AG

42 42 Screw Assemblies Ball Screw Assemblies BASA Nuts, Standard Series Flanged Single Nut FEM-E-D Mounting dimensions as per JIS B1192, Table 5 With seals With backlash or reduced backlash Preload 2%, 3% or 5%. Tolerance grades T3 2), T5, T7, T9. c c When setting up applications, do not allow components to collide with the Front Lube Unit. Ordering code: BASA 20 x 5R x 3 FEM-E-D T7 R 8ABZ150 41Z d 0 = nominal diameter P = lead (R = right-hand) D W = ball diameter i = number of ball track turns Category Size Part number Load ratings Linear speed 1) dyn. C stat. C 0 v max d 0 x P x D w - i (N) (N) (m/min) B 20 x 5R x 3-4 R A B 20 x 10R x 3-4 R A B 20 x 20R x R A B 25 x 5R x 3-4 R A B 25 x 10R x 3-4 R A B 32 x 5R x R A B 32 x 10R x R A B 32 x 20R x R A B 40 x 5R x R A B 40 x 10R x 6-4 R A B 40 x 20R x 6-3 R A B 40 x 40R x 6-2 R A B 50 x 5R x R A B 50 x 10R x 6-6 R A B 50 x 20R x R A B 50 x 40R x R A B 63 x 10R x 6-6 R A B 63 x 20R x R A B 63 x 40R x R A C 80 x 10R x R A C 80 x 20R x R A ) See Characteristic speed d 0 n on page 141 and Critical speed n cr on page 178 2) Tolerance grade T3 for sizes shown in table on page 12 Bosch Rexroth AG, R ( )

43 D 6 Ball Screw Assemblies BASA Screw Assemblies Nuts, Standard Series 43 M6 3) L 10 S 3) L D 5 L 3 D 1 L 4 L 0,05 D 1 0,1 6x60 D 12 D w D 7 d 2 d 1 d 0 Ball Screw Assemblies BASA 3) Use lube nipple with tapered thread Size (mm) Weight d 1 d 2 D 1 D 5 D 6 D 7 D 12 L L 3 L 4 L 10 L 12 S m d 0 x P x D w - i g6 (kg) 20 x 5R x M x 10R x M x 20R x M x 5R x M x 10R x M x 5R x M x 10R x M x 20R x M x 5R x Rc 1/ x 10R x Rc 1/ x 20R x Rc 1/ x 40R x Rc 1/ x 5R x Rc 1/ x 10R x Rc 1/ x 20R x Rc 1/ x 40R x Rc 1/ x 10R x Rc 1/ x 20R x Rc 1/ x 40R x Rc 1/ x 10R x Rc 1/ x 20R x Rc 1/ R ( ), Bosch Rexroth AG

44 44 Screw Assemblies Ball Screw Assemblies BASA Nuts, Standard Series Adjustable-Preload Single Nut SEM-E-S Rexroth mounting dimensions With seals Left-hand version in some cases Adjustable preload Tolerance grade T3 2, T5, T7 Note: The Front Lube Unit is only available for right-hand screw threads. cc When setting up applications, do not allow components to collide with the Front Lube Unit. d 0 = nominal diameter P = lead (R = right-hand, L = left-hand) D W = ball diameter i = number of ball track turns Ordering code: BASA 20 x 5R x 3 SEM-E-S T7 R 82Z120 41Z Category Size Part number Load ratings Linear speed 1) Centering diameter D 1 dyn. C stat. C 0 v max after adjustment d 0 x P x D w - i (N) (N) (m/min) min. (mm) max. (mm) B 16 x 5R x 3-4 R B 16 x 10R x 3-3 R B 16 x 16R x 3-2 R B 20 x 5R x 3-4 R B 20 x 20R x R B 25 x 5R x 3-4 R B 25 x 10R x 3-4 R B 25 x 25R x R B 32 x 5R x R B 32 x 10R x R B 32 x 20R x R B 32 x 32R x R B 40 x 5R x R B 40 x 10R x 6-4 R B 40 x 20R x 6-3 R B 40 x 40R x 6-2 R B 50 x 5R x R B 50 x 10R x 6-6 R B 50 x 20R x R B 50 x 40R x R B 63 x 10R x 6-6 R B 63 x 20R x R B 63 x 40R x R C 80 x 10R x R C 80 x 20R x R Versions with left-hand lead B 16 x 5L x 3-4 R B 20 x 5L x 3-4 R B 25 x 5L x 3-4 R B 32 x 5L x R B 40 x 5L x R B 40 x 10L x 6-4 R ) See Characteristic speed d 0 n on page 141 and Critical speed n cr on page 178 2) Tolerance grade T3 for sizes shown in table on page 12 Bosch Rexroth AG, R ( )

45 Ball Screw Assemblies BASA Screw Assemblies Nuts, Standard Series 45 Lube port 3) at flange center right L 5 L 10 4x60 S ϕ left S 60 ϕ D5 D1 +0,7 D1 L 3 L 4 L 3,4 0,05 D 1 0,1 D 6 D 7 BB7 BB7 D w D 6 D 7 d2 d1 d0 Ball Screw Assemblies BASA 3) Lube port machining: flat surface L 3 15 mm, countersink L 3 15 mm. For size 8 x 2.5, a funnel-type lube nipple DIN 3405 is provided. Size (mm) Weight d 1 d 2 D 1 D 5 Hole pattern D 6 D 7 L L 3 L 4 L 5 L 10 S 3) ϕ m d 0 x P x D w - i f9 ( ) (kg) 16 x 5R x BB M x 10R x BB M x 16R x BB M x 5R x BB M x 20R x BB M x 5R x BB M x 10R x BB M x 25R x BB M x 5R x BB M x 10R x BB M x 20R x BB M x 32R x BB M x 5R x BB M8x x 10R x BB M8x x 20R x BB M8x x 40R x BB M8x x 5R x BB M8x x 10R x BB M8x x 20R x BB M8x x 40R x BB M8x x 10R x BB M8x x 20R x BB M8x x 40R x BB M8x x 10R x BB M8x x 20R x BB M8x Versions with left-hand lead 16 x 5L x BB M x 5L x BB M x 5L x BB M x 5L x BB M x 5L x BB M8x x 10L x BB M8x R ( ), Bosch Rexroth AG

46 46 Screw Assemblies Ball Screw Assemblies BASA Nuts, Standard Series Adjustable-Preload Single Nut SEM-E-C Mounting dimensions similar to DIN 69051, Part 5 Flange type C With seals Adjustable preload Tolerance grade T3 2, T5, T7 cc When setting up applications, do not allow components to collide with the Front Lube Unit. d 0 = nominal diameter P = lead (R = right-hand) D W = ball diameter i = number of ball track turns Ordering code: BASA 20 x 5R x 3 SEM-E-C T7 R 82Z120 41Z Category Size Part number Load ratings Linear speed 1) Centering diameter D 1 dyn. C stat. C 0 v max after adjustment d 0 x P x D w - i (N) (N) (m/min) min. (mm) max. (mm) B 16 x 5R x 3-4 R B 16 x 10R x 3-3 R B 16 x 16R x 3-3 R B 20 x 5R x 3-4 R B 20 x 20R x R B 25 x 5R x 3-4 R B 25 x 10R x 3-4 R B 25 x 25R x R B 32 x 5R x R B 32 x 10R x R B 32 x 20R x R B 32 x 32R x R B 40 x 5R x R B 40 x 10R x 6-4 R B 40 x 12R x 6-4 R B 40 x 20R x 6-3 R B 40 x 40R x 6-3 R B 50 x 5R x R B 50 x 10R x 6-6 R B 50 x 12R x 6-6 R B 50 x 20R x R B 50 x 40R x R B 63 x 10R x 6-6 R C 63 x 20R x R C 63 x 40R x R C 80 x 10R x R C 80 x 20R x R ) See Characteristic speed d 0 n on page 141 and Critical speed n cr on page 178 2) Tolerance grade T3 for sizes shown in table on page 12 Bosch Rexroth AG, R ( )

47 Ball Screw Assemblies BASA Screw Assemblies Nuts, Standard Series 47 Lube port 3) BB2 d 0 32 BB1 d 0 40 L 8 D 7 L 5 L 10 S D7 S D 5 D 1 +0,7 L 3 L 4 L D w d2 D 1 d1 d0 0,05 D 1 0,1 90 D 6 22,5 L D 6 30 L 9 Ball Screw Assemblies BASA 3) Lube port machining: flat surface L 3 15 mm, countersink L 3 > 15 mm Size (mm) Weight d 1 d 2 D 1 D 5 Hole pattern D 6 D 7 L L 3 L 4 L 5 L 8 L 9 L 10 S 3) m d 0 x P x D w - i f9 (kg) 16 x 5R x BB M x 10R x BB M x 16R x BB M x 5R x BB M x 20R x BB M x 5R x BB M x 10R x BB M x 25R x BB M x 5R x BB M x 10R x BB M x 20R x BB M x 32R x BB M x 5R x BB M8x x 10R x BB M8x x 12R x BB M8x x 20R x BB M8x x 40R x BB M8x x 5R x BB M8x x 10R x BB M8x x 12R x BB M8x x 20R x BB M8x x 40R x BB M8x x 10R x BB M8x x 20R x BB M8x x 40R x BB M8x x 10R x BB M8x x 20R x BB M8x R ( ), Bosch Rexroth AG

48 48 Screw Assemblies Ball Screw Assemblies BASA Nuts, Standard Series Cylindrical Single Nut ZEM-E-S / ZEM-E-K / ZEM-E-A Rexroth mounting dimensions With seals Left-hand version in some cases With backlash, reduced backlash, preload 2%; 3%; 5% Tolerance grade T3 4), T5, T7, T9 1) 2) d 0 = nominal diameter P = lead (R = right-hand, L = left-hand) D W = ball diameter i = number of ball track turns 1) ZEM-E-K / nuts for Rexroth modules and drive units 2) ZEM-E-A / nuts with mounting dimensions as per DIN 69051, Part 5 3) See Characteristic speed d 0 n on page 141 and Critical speed n cr on page 178 4) Tolerance grade T3 for sizes shown in table on page 12 Ordering code: BASA 20 x 5R x 3 ZEM-E-S T7 R 82Z120 41Z Category Size Part number Load ratings Linear speed 3) d 0 x P x D w - i dyn. C stat. C 0 v max (N) (N) (m/min) B 16 x 5R x 3-4 R B 16 x 5R x 3-4 R ) B 16 x 10R x 3-3 R B 16 x 10R x 3-3 R ) B 16 x 10R x 3-3 R ) B 16 x 16R x 3-2 R B 16 x 16R x 3-3 R B 16 x 16R x 3-2 R ) B 16 x 16R x 3-3 R ) B 20 x 5R x 3-5 R B 20 x 5R x 3-4 R ) B 20 x 10R x 3-4 R B 20 x 20R x R B 20 x 20R x R B 20 x 20R x R ) B 25 x 5R x 3-4 R B 25 x 10R x 3-4 R B 25 x 25R x R B 25 x 25R x R B 32 x 5R x R B 32 x 5R x R ) B 32 x 10R x R B 32 x 10R x R ) B 32 x 20R x R B 32 x 20R x R B 32 x 32R x R B 32 x 32R x R B 40 x 5R x R B 40 x 5R x R ) B 40 x 10R x 6-4 R B 40 x 10R x 6-6 R B 40 x 20R x 6-3 R B 40 x 40R x 6-2 R B 40 x 40R x 6-3 R B 50 x 5R x R B 50 x 10R x 6-6 R B 50 x 20R x R B 63 x 10R x 6-6 R C 80 x 10R x R Versions with left-hand lead B 16 x 5L x 3-4 R B 20 x 5L x 3-5 R B 20 x 5L x 3-4 R ) B 25 x 5L x 3-4 R B 32 x 5L x R B 40 x 5L x R B 40 x 10L x 6-4 R Bosch Rexroth AG, R ( )

49 Ball Screw Assemblies BASA Screw Assemblies Nuts, Standard Series 49 L 11 L 6 A T 1 D 1 B A D 4 0,2 L L 7 Lube port D w d2 d1 d 0 Ball Screw Assemblies BASA Size (mm) Weight d 0 x P x D w - i d 1 d 2 D 1 D 4 L L 6 L 7 L 11 B T 1 m g6 ± P (kg) 16 x 5R x x 5R x x 10R x x 10R x x 10R x x 16R x x 16R x x 16R x x 16R x x 5R x x 5R x x 10R x x 20R x x 20R x x 20R x x 5R x x 10R x x 25R x x 25R x x 5R x x 5R x x 10R x x 10R x x 20R x x 20R x x 32R x x 32R x x 5R x x 5R x x 10R x x 10R x x 20R x x 40R x x 40R x x 5R x x 10R x x 20R x x 10R x x 10R x Versions with left-hand lead 16 x 5L x x 5L x x 5L x x 5L x x 5L x x 5L x x 10L x R ( ), Bosch Rexroth AG

50 50 Screw Assemblies Ball Screw Assemblies BASA Nuts, Standard Series Screw-in nut ZEV-E-S Rexroth mounting dimensions With low-friction seal With backlash, reduced backlash, preload 2%. Tolerance grade T3 2), T5, T7, T9 Ordering code: BASA 20 x 5R x 3 ZEV-E-S T7 R 81K120 41K d 0 = nominal diameter P = lead (R = right-hand) D W = ball diameter i = number of ball track turns Category Size Part number Load ratings Linear speed 1) d 0 x P x D w - i dyn. C (N) stat. C 0 (N) v max (m/min) B 16 x 5R x 3-3 R B 16 x 10R x 3-3 R B 20 x 5R x 3-4 R B 25 x 5R x 3-7 R B 25 x 10R x 3-5 R B 32 x 5R x R B 32 x 10R x R ) See Characteristic speed d 0 n on page 141 and Critical speed n cr on page 178 2) Tolerance grade T3 for sizes shown in table on page 12 Bosch Rexroth AG, R ( )

51 Ball Screw Assemblies BASA Screw Assemblies Nuts, Standard Series 51 Lube port G1 D 4 L 7 D 8 Hole for hook wrench L 15 L D 1 D w d2 d1 d 0 Ball Screw Assemblies BASA Size (mm) Weight d 1 d 2 D 1 D 4 D 8 G 1 L L 7 L 15 m d 0 x P x D w - i h10 ±0.3 (kg) 16 x 5R x M26 x x 10R x M26 x x 5R x M35 x x 5R x M40 x x 10R x M40 x x 5R x M48 x x 10R x M48 x R ( ), Bosch Rexroth AG

52 52 Screw Assemblies Ball Screw Assemblies BASA Nuts, Standard Series Double Nut with Flange FDM-E-S Rexroth mounting dimensions With seals With preload 7% or 10% Tolerance grades T3 2), T5, T7 Note: Supplied only as complete ball screw assembly. c c When setting up applications, do not allow components to collide with the Front Lube Unit. d 0 = nominal diameter Ordering code: P = lead (R = right-hand) BASA 20 x 5R x 3 FDM-E-S T7 R 82Z120 41Z D W = ball diameter i = number of ball track turns Category Size Part number Load ratings Linear speed 1) d 0 x P x D w - i dyn. C (N) stat. C 0 (N) v max (m/min) C 16 x 5R x 3-4 R C 20 x 5R x 3-4 R C 25 x 5R x 3-4 R C 25 x 10R x 3-4 R C 32 x 5R x R C 32 x 10R x R C 40 x 5R x R C 40 x 10R x 6-4 R C 40 x 10R x 6-6 R C 40 x 20R x 6-3 R C 50 x 5R x R C 50 x 10R x 6-4 R C 50 x 10R x 6-6 R C 50 x 20R x R C 63 x 10R x 6-4 R C 63 x 10R x 6-6 R C 63 x 20R x R C 80 x 10R x R C 80 x 20R x R ) See Characteristic speed d 0 n on page 141 and Critical speed n cr on page 178 2) Tolerance grade T3 for sizes shown in table on page 12 Bosch Rexroth AG, R ( )

53 Ball Screw Assemblies BASA Screw Assemblies Nuts, Standard Series 53 Lube port 3) at flange center BB3 BB4 L 10 D 7 S D 7 S D 5 L 3 D 1 L 4 L 0,04 D 1 0,2 D 6 BB5 D 7 4x90 S 6x ,5 D 6 D w Ball Screw Assemblies BASA D 6 8x45 d 2 d 1 d 0 3) Lube port machining: flat surface L 3 15 mm, countersink L 3 > 15 mm Size (mm) Weight d 1 d 2 D 1 D 5 Hole pattern D 6 D 7 L L 3 L 4 L 10 S 3) m d 0 x P x D w - i g6 (kg) 16 x 5R x BB M x 5R x BB M x 5R x BB M x 10R x BB M x 5R x BB M x 10R x BB M x 5R x BB M8x x 10R x BB M8x x 10R x BB M8x x 20R x BB M8x x 5R x BB M8x x 10R x BB M8x x 10R x BB M8x x 20R x BB M8x x 10R x BB M8x x 10R x BB M8x x 20R x BB M8x x 10R x BB M8x x 20R x BB M8x R ( ), Bosch Rexroth AG

54 54 Screw Assemblies Ball Screw Assemblies BASA Nuts, Standard Series Double Nut with Flange FDM-E-C Mounting dimensions similar to DIN 69051, Part 5 Flange type C (flange type B available. See ordering code p. 22) With seals With preload 7% or 10% Tolerance grades T3 2), T5, T7 Note: Supplied only as complete ball screw assembly. c c When setting up applications, do not allow components to collide with the Front Lube Unit. d 0 = nominal diameter P = lead (R = right-hand) D W = ball diameter i = number of ball track turns Ordering code: BASA 20 x 5R x 3 FDM-E-S T7 R 82Z120 41Z Category Size Part number Load ratings Linear speed 1) d 0 x P x D w - i dyn. C (N) stat. C 0 (N) v max (m/min) C 16 x 5R x 3-4 R C 20 x 5R x 3-4 R C 25 x 5R x 3-4 R C 25 x 10R x 3-4 R C 32 x 5R x R C 32 x 10R x R C 40 x 5R x R C 40 x 10R x 6-4 R C 40 x 10R x 6-6 R C 40 x 20R x 6-3 R C 50 x 5R x R C 50 x 10R x 6-4 R C 50 x 10R x 6-6 R C 50 x 20R x R C 63 x 10R x 6-4 R C 63 x 10R x 6-6 R C 63 x 20R x R C 80 x 10R x R C 80 x 20R x R ) See Characteristic speed d 0 n on page 141 and Critical speed n cr on page 178 2) Tolerance grade T3 for sizes shown in table on page 12 Bosch Rexroth AG, R ( )

55 Ball Screw Assemblies BASA Screw Assemblies Nuts, Standard Series 55 Lube port 3) at flange center BB2 D 7 d 0 32 L 10 S D 5 L 3 D 1 L 4 L D w 0,04 0, S 30 22,5 L 9 L 9 D 1 BB1 D 7 d 0 40 D 6 d 2 d 1 d 0 Ball Screw Assemblies BASA D 6 3) Lube port machining: flat surface L 3 15 mm, countersink L 3 > 15 mm Size (mm) Weight d 1 d 2 D 1 D 5 Hole pattern D 6 D 7 L L 3 L 4 L 4) 9 L 10 S 3) m d 0 x P x D w - i g6 (kg) 16 x 5R x BB M x 5R x BB M x 5R x BB M x 10R x BB M x 5R x BB M x 10R x BB M x 5R x BB M8x x 10R x BB M8x x 10R x BB M8x x 20R x BB M8x x 5R x BB M8x x 10R x BB M8x x 10R x BB M8x x 20R x BB M8x x 10R x BB M8x x 10R x BB M8x x 20R x BB M8x x 10R x BB M8x x 20R x BB M8x ) Flange type B (two flat surfaces) option available! R ( ), Bosch Rexroth AG

56 56 Screw Assemblies Ball Screw Assemblies BASA Nuts, Standard Series Double Nut with Flange FDM-E-D Mounting dimensions as per JIS B1192, Table 5 With seals Preload 7% or 10%. Tolerance grades T3 2), T5, T7. Note: Supplied only as complete ball screw assembly. c c When setting up applications, do not allow components to collide with the Front Lube Unit. d 0 = nominal diameter P = lead (R = right-hand) D W = ball diameter i = number of ball track turns Ordering code: BASA 20 x 5R x 3 FDM-E-D T7 R 8ABZ150 41Z Category Size Part number Load ratings Linear speed 1) dyn. C stat. C 0 v max d 0 x P x D w - i (N) (N) (m/min) C 20 x 5R x 3-4 R B C 25 x 5R x 3-4 R B C 25 x 10R x 3-4 R B C 32 x 5R x R B C 32 x 10R x R B C 40 x 5R x R B C 40 x 10R x 6-4 R B C 40 x 20R x 6-3 R B C 50 x 5R x R B C 50 x 10R x 6-4 R B C 50 x 20R x R B C 63 x 10R x 6-4 R B C 63 x 20R x R B C 80 x 10R x R B C 80 x 20R x R B ) See Characteristic speed d 0 n on page 141 and Critical speed n cr on page 178 2) Tolerance grade T3 for sizes shown in table on page 12 Bosch Rexroth AG, R ( )

57 Ball Screw Assemblies BASA Screw Assemblies Nuts, Standard Series 57 M6 3) L 10 S 3) D w d 2 d 1 d 0 D 5 D 1 L 3 L 4 L 0,04 D 1 0,2 D 6 6X60 30 D 12 L 12 D 7 Ball Screw Assemblies BASA 1) Use lube nipple with tapered thread Size (mm) Weight d 1 d 2 D 1 D 5 D 6 D 7 D 12 L L 3 L 4 L 10 L 12 S m d 0 x P x D w - i g6 (kg) 20 x 5R x M x 5R x M x 10R x M x 5R x M x 10R x M x 5R x Rc 1/ x 10R x Rc 1/ x 20R x Rc 1/ x 5R x Rc 1/ x 10R x Rc 1/ x 20R x Rc 1/ x 10R x Rc 1/ x 20R x Rc 1/ x 10R x Rc 1/ x 20R x Rc 1/ R ( ), Bosch Rexroth AG

58 58 Screw Assemblies Ball Screw Assemblies BASA Nuts, High-Performance Series Nuts, High-Performance Series High-performance series HP series ball screw assemblies are available with nominal diameters of mm, and leads of mm. The HP nut type is a flanged single nut which is available with a driven screw or as a driven nut. FED-E-B FAR-B-S Bosch Rexroth AG, R ( )

59 Ball Screw Assemblies BASA Screw Assemblies Nuts, High-Performance Series 59 Driven flanged single nut FAR-B-S Fundamental advantages of systems with driven nuts Moment of inertia In the case of long screws, the screw does not have to be rotated in the acceleration phase, only the nut. The mass moment of inertia of the screw is not therefore critical. The moment of inertia of the nut is comparatively low and it is no longer dependent on the required stroke. Dynamics The intricate end bearing designs that are needed for high dynamics, e.g. fixed bearing on both ends with angular-contact ball bearings are no longer necessary. Screw extenders Since the screw is stationary, relatively effort is needed to stretch the screw Increase in permissible axial loading (buckling load); not limited by end bearings Compensation of temperature influences Increase in overall rigidity Ball Screw Assemblies BASA Design and manufacturing tolerances The use of nuts with a high level of axial and radial runout precision minimizes the induced screw vibration. All functional components are supplied from a single source. Own designs are no longer needed Liquid cooling Improved cooling can easily be provided by using a hollow-bored screw: cooling of the stationary screw can be provided with comparatively little effort. Controlled cooling virtually eliminates changes in length due to temperature fluctuations. User benefits Efficiency provided by complete unit Adjustment to various speeds and loads is possible using the screw lead and the speed reducing belt Small space requirements thanks to its compact construction Little installation work for the customer, and integral, full functionality Low system costs High positioning accuracy For particularly demanding positioning tasks, it can be combined with the direct distance measuring system that is integrated in the guide rail Ball screw assemblies BASA screw 2 Driven nut FAR R ( ), Bosch Rexroth AG

60 60 Screw Assemblies Ball Screw Assemblies BASA Nuts, High-Performance Series Flanged Single Nut FED-E-B Mounting dimensions similar to DIN 69051, Part 5 Flange type B Nut for significantly increasing the dynamic and static load rating With seals With backlash or reduced backlash Preload 2% or 3% Tolerance grade T3 3), T5, T7, T9 Note: Supplied only as complete ball screw assembly. cc When setting up applications, do not allow components to collide with the Front Lube Unit. Ordering code: BASA 40x20R x 6 FED-E-B T5 R 82Z300 41K Category Size Part number Load ratings max. static load 1) 2) Speed dyn. C stat. C 0 v max d 0 x P x D W - i (N) (N) (N) (m/min) B 16 x 16 R x 3-6 R B 20 x 20 R x R B 25 x 25 R x R B 32 x 20 R x R B 32 x 32 R x R B 40 x 20 R x 6-8 R B 40 x 40 R x 6-6 R B 50 x 20 R x R B 50 x 25 R x R B 50 x 40 R x R B 63 x 20 R x R B 63 x 40 R x R ) The load-bearing capability of the rolling contact is greater than the mechanical strength of the nut body, therefore the maximum static load data has been included. 2) When selecting end bearings, please contact your local sales partner for assistance. 3) Tolerance grade T3 for sizes shown in table on page 12 d 0 = nominal diameter P = lead (R = right-hand) D W = ball diameter i = number of ball track turns Bosch Rexroth AG, R ( )

61 Ball Screw Assemblies BASA Screw Assemblies Nuts, High-Performance Series 61 BB2 d 0 32 BB1 d 0 40 Lube port 4 ) at flange center L 10 D 7 D 7 30 S 90 D 6 D 5 22,5 S D1 L 5 L 3 L 4 L 0,05 0,1 D w D1 90 L D 6 D 5 L14 Ball Screw Assemblies BASA d2 d1 d0 4) Lube port machining: flat surface L 3 15 mm, countersink L 3 > 15 mm Size (mm) Weight d 1 d 2 D 1 D 5 Hole pattern D 6 D 7 L L 3 L 4 L 5 L 10 L 14 S m d 0 x P x D W - i g6 (kg) 16 x 16 R x BB M x 20 R x BB M x 25 R x BB M x 20 R x BB M x 32 R x BB M x 20 R x BB M8x x 40 R x BB M8x x 20 R x BB M8x x 25 R x BB M8x x 40 R x BB M8x x 20 R x BB M8x x 40 R x BB M8x R ( ), Bosch Rexroth AG

62 62 Screw Assemblies Ball Screw Assemblies BASA Nuts, High-Performance Series Driven Flanged Single Nut FAR-B-S Rexroth mounting dimensions With seals With preload 2%, 3% or 5% Tolerance grade T3 3), T5, T7 The unit consists of: nut, angular-contact thrust ball bearing and slotted nut NMZ When stationary it can be relubricated with NLGI Class 2 grease via the stationary lube port of the bearing outer race. Note: Supplied only as complete ball screw assembly. d 0 = nominal diameter P = lead (R = right-hand) D W = ball diameter i = number of ball track turns Ordering code: BASA 40x20R x 6 FAR-B-S T5 R 51K300 51K Category FAR size Max. speed 4) Size Part number Load ratings 1) Weight Mass moment Frictional torque Rigidity Module of inertia Bearing 2) dyn. C stat. C 0 m FAR J rotfar M RL R G n G d 0 x P x D w - i (N) (N) (kg) (kg m ) (Nm) (N/µm) (min 1 ) C x 10R x R x 20R x R x 32R x R C x 10R x 6-5 R x 20R x 6-3 R x 40R x 6-3 R C x 10R x 6-6 R x 20R x R x 40R x R C x 10R x 6-6 R x 20R x R x 40R x R ) Load ratings calculated according to DIN ISO ) Bearing and nut with 5% preload 3) Tolerance grade T3 for sizes shown in table on page 12 4) Limited by the max. speed of the bearing. Bearing preloaded without external operating load. Duty cycle 25%; max. steady-state temp. +50 C FAR rigidity levels FAR size Size Rigidity Overall rigidity of the nut unit (N/µm) Screw Bearing Preload 2% Preload 3% Preload 5% R S R al R G R G R G d 0 x P x D w - i (Nm/µm) (N/µm) x 10R x x 20R x x 32R x x 10R x x 20R x x 40R x x 10R x x 20R x x 40R x x 10R x x 20R x x 40R x Bosch Rexroth AG, R ( )

63 Ball Screw Assemblies BASA Screw Assemblies Nuts, High-Performance Series 63 BASA nut Bearing S L lube port Slotted nut NMZ 6x60 d L D5 D 7 Belt pulley L 3 B L L FAR B N DN DL K L D 6 8 x 45 S L Lube port D w d2 d1 d 0 Ball Screw Assemblies BASA FAR Size Dimensions (mm) Size d 1 d 2 L FAR D 5 D 6 D 7 L 3 D L B L K L d L S 5) L D N B N d 0 x P x D w - i h / x 10R x M M x 20R x x 32R x x 10R x M M x 20R x x 40R x x 10R x M M x 20R x x 40R x x 10R x M M x 20R x x 40R x ) Condition on delivery: lube ports S L sealed by setscrews (M6). The lube port can be opened by removing the set screw. R ( ), Bosch Rexroth AG

64 64 Screw Assemblies Ball Screw Assemblies BASA Screws Precision screw Bosch Rexroth AG, R ( )

65 Ball Screw Assemblies BASA Screw Assemblies Screws 65 D w Ball Screw Assemblies BASA d 2 d 1 d 0 L tot Please state length in the Inquiry/Order Form L tot = overall length Size Part number (mm) Moment of inertia Maximum length (mm) Weight Tolerance grade Js Standard on d 0 x P x D W T5 T7 T9 d 1 d 2 (kg cm 2 /m) request (kg/m) 8 x 2.5R x R R R x 5R x 2 R R R x 10R x 2 R R R x 5L x 3 R R R x 5R x 3 R R R x 10R x 3 R R R x 16R x 3 R R R x 5R x 3 R R R x 5L x 3 R R R x 10R x 3 R R R x 20R x 3.5 R R R x 5R x 3 R R R x 5L x 3 R R R x 10R x 3 R R R x 25R x 3.5 R R R x 5R x 3.5 R R R x 5L x 3.5 R R R x 10R x R R R x 20R x R R R x 32R x R R R x 5R x 3.5 R R R x 5L x 3.5 R R R x 10R x 6 R R R x 10L x 6 R R R x 12R x 6 R R R x 16R x 6 R R R x 20R x 6 R R R x 40R x 6 R R R x 5R x 3.5 R R R x 10R x 6 R R R x 12R x 6 R R R x 16R x 6 R R R x 20R x 6.5 R R R x 25R x 6.5 R R R x 40R x 6.5 R R R x 10R x 6 R R R x 20R x 6.5 R R R x 40R x 6.5 R R R x 10R x 6.5 R R R R ( ), Bosch Rexroth AG

66 66 Screw Assemblies Ball Screw Assemblies BASA Screw Ends Screw ends, forms for a left or right screw end Basic version With keyway 00 page page A 12 12A page page page page A 52 52A page page page A 82 82A page /83 83A 841/84 84A page 86 8A 8AB 8B 8BB page A 92 92A page /93 93A 941/94 94A page 92 9A 9AB 9B 9BB page 94 A1 A1A A2 A2A page 96 Machining of end face Z Centering hole DIN 332-D S Hex socket G Female thread Bosch Rexroth AG, R ( )

67 Ball Screw Assemblies BASA Screw Assemblies Screw Ends 67 Form 00 Option (machining of end face) K None Z t Z Z 00 Ordering code: BASA 20x5R x 3 SEM-E-S T7 R 00Z200 82Z d 0 x P S G t S t G S G Ball Screw Assemblies BASA Form Version BASA size (mm) Centering hole Hex socket Thread d 0 P Z t Z S t S G tg / /2/ /5/10 M M /10/16 M M /10/20/40 M M /10/25 M M /10/20/32/64 M M /10/12/16/20/40 M M /10/12/16/20/25/40 M M /20/40 M M /20 M M24 36 R ( ), Bosch Rexroth AG

68 68 Screw Assemblies Ball Screw Assemblies BASA Screw Ends Form 01, 02 Undercut Form E DIN 509 Undercut Form E DIN 509 Option (machining of end face) K None Z t Z Z Undercut for retaining ring DIN 471 L 6 LS 1 S t S S 01 D 1 D 2 S 1 S T 1 G t G b x l x t G 02 L1 L2 L jl Ordering code: BASA 20x5R x 3 SEM-E-S T7 R 02Z120 82Z Form Version 1) Size (mm) Keyway as per DIN 6885 d 0 P L jl D 1 L 1 D 2 L 2 L 6 S 1 ST1 LS 1 b l t j6 h7 H13 P /2/ h /5/ h /10/ h /10/20/ h /10/20/ h /10/ h /10/20/32/ h /10/20/32/ h /10/12/16/20/ h /10/12/16/20/25/ h /20/ h / h /10/ h /10/20/ h /10/20/ h /10/ h /10/20/32/ h /10/20/32/ h /10/12/16/20/ h /10/12/16/20/25/ h /20/ h / h ) The allocation of screw ends to the bearing units is defined by the version. Bosch Rexroth AG, R ( )

69 Ball Screw Assemblies BASA Screw Assemblies Screw Ends 69 End bearings for screw ends Form 01, 02 Deep-groove ball bearing as per DIN 625 Application Retaining ring as per DIN 471 Ball Screw Assemblies BASA Deep-groove ball bearing as per DIN 625 Retaining ring n Centering hole Hex socket Thread Z t Z S t S G t G Designation Part number Designation Part number 625.2RS R x0.4 R RS R x0.6 R M3 9.0 M RS R x0.8 R M M RS R x1 R M M RS R x1 R M M RS R x1 R M M RS R x1.2 R M M RS R x1.2 R M M RS R x1.5 R M M RS R x1.5 R M M RS R x1.75 R M M RS R x2 R M3 9.0 M RS R x0.8 R M M RS R x1 R M M RS R x1 R M M RS R x1 R M M RS R x1.2 R M M RS R x1.2 R M M RS R x1.5 R M M RS R x1.5 R M M RS R x1.75 R M M RS R x2 R R ( ), Bosch Rexroth AG

70 70 Screw Assemblies Ball Screw Assemblies BASA Screw Ends Form 11, 11A, 12, 12A Undercut Form E DIN 509 Undercut Form E DIN 509 Option (machining of end face) K None Z t Z Z Thread undercut DIN 76 short 11 11A D 1 D 2 G 1 S t S S b x l x t G t G 12 G 12A SW L 1 L jf L 2 LG 1 b SW l SW Ordering code: BASA 20x5R x 3 SEM-E-S T7 R 12AZ120 41Z (mm) Form Version 1) Size Keyway as per Centering hole DIN 6885 Hex socket d 0 P L jl D 1 L 1 D 2 L 2 G 1 LG 1 b l t Z t Z S t S h6 h7 P9 11/11A /10/ M6x / M10x M /10/ M15x M /10/20/32/ M17x M /10/12/16/20/ M20x M M25x M /12/16/20/25/ M25x M M30x M /20/ M35x M / M40x M /12A /10/ M6x /10/20/ M10x /10/ M15x M /10/20/32/ M17x M /10/12/16/20/ M20x M M25x M /12/16/20/25/ M25x M M30x M /20/ M35x M / M40x M ) The allocation of screw ends to the bearing units is defined by the version. Bosch Rexroth AG, R ( )

71 Ball Screw Assemblies BASA Screw Assemblies Screw Ends 71 End bearings for screw ends form 11, 11A, 12, 12A Angular-contact thrust ball bearing LGF Angular-contact thrust ball bearing LGN Application Slotted nut NMZ Slotted nut NMA Ball Screw Assemblies BASA Thread Wrench size Angular-contact thrust ball bearing Slotted nut LGF LGN G t G SW b SW I SW Designation Part number Designation Part number Designation Part number LGN-B-1034 R NMZ6x0.5 R M LGF-B-1255 R LGN-B-1242 R NMZ10x1 R M LGF-B-1762 R LGN-B-1747 R NMA15x1 R M LGF-B-2068 R LGN-B-2052 R NMA17x1 R M LGF-C-2575 R LGN-C-2557 R NMA20x1 R M LGF-B-3080 R LGN-B-3062 R NMA25x1.5 R M LGF-C-3080 R LGN-C-3062 R NMA25x1.5 R M LGF-B-3590 R LGN-B-3572 R NMA30x1.5 R M LGF-B R LGN-A-4090 R NMA35x1.5 R M LGF-A R LGN-A R NMA40x1.5 R LGN-B-1034 R NMZ6x0.5 R M LGF-B-1255 R LGN-B-1242 R NMZ10x1 R M LGF-B-1762 R LGN-B-1747 R NMA15x1 R M LGF-B-2068 R LGN-B-2052 R NMA17x1 R M LGF-B-2575 R LGN-C-2557 R NMA20x1 R M LGF-B-3080 R LGN-B-3062 R NMA25x1.5 R M LGF-C-3080 R LGN-C-3062 R NMA25x1.5 R M LGF-B-3590 R LGN-B-3572 R NMA30x1.5 R M LGF-B R LGN-A-4090 R NMA35x1.5 R M LGF-A R LGN-A R NMA40x1.5 R R ( ), Bosch Rexroth AG

72 72 Screw Assemblies Ball Screw Assemblies BASA Screw Ends Form 21, 22 Undercut Form E DIN 509 Option (machining of end face) K None Z t Z Z 21 D 1 S t S S b x l x t G t G 22 G L jl Ordering code: BASA 20x5R x 3 SEM-E-S T7 R 21Z120 82Z Form Version 1) Size (mm) Keyway as per DIN 6885 Centering hole d 0 P L jl D 1 b l t Z t Z j /2/ /5/ /10/ M /10/20/ M /10/20/ M /10/ M /10/20/32/ M /10/20/32/ M /10/12/16/20/ M /10/12/16/20/25/ M /20/ M / M /10/ M /10/20/ M /10/20/ M /10/ M /10/20/32/ M /10/20/32/ M /10/12/16/20/ M /10/12/16/20/25/ M /20/ M / M ) The allocation of screw ends to the bearing units is defined by the version. Bosch Rexroth AG, R ( )

73 Ball Screw Assemblies BASA Screw Assemblies Screw Ends 73 End bearings for screw ends Form 21, 22 Application Bearing LAD 2) Ball Screw Assemblies BASA Hex socket Thread Deep-groove ball bearing as per DIN 625 Designation Part number 625.2RS R RS R M RS R M RS R M RS R M RS R M RS R M RS R M RS R M RS R M RS R M RS R M M M M M M M M M M ) Items delivered: 1 bearing, 2 retaining rings. R ( ), Bosch Rexroth AG

74 74 Screw Assemblies Ball Screw Assemblies BASA Screw Ends Form 31 Option (machining of end face) K None Z t Z Z Undercut Form E DIN 509 Undercut for retaining ring DIN 471 (3x) S t S S L4 L 4 LS 1 31 ST 1 S 1 D 1 G t G L 5 G L jl Ordering code: BASA 20x5R x 3 SEM-E-S T7 R 31Z120 82Z Form Version 1) Size (mm) Centering hole d 0 P L jl D 1 L 4 L 5 S 1 ST1 LS 1 Z t Z j6 H /2/ h /5/ h /10/ h M /10/20/ h M /10/20/ h M /10/ h M /10/20/32/ h M /10/20/32/ h M /10/12/16/20/ h M /10/12/16/20/25/ h M /20/ h M / h M ) The allocation of screw ends to the bearing units is defined by the version. Note: Form 31 with double floating bearing increases the critical speed, n cr. See Permissible axial load on screw Fc (buckling load) on page 179 Bosch Rexroth AG, R ( )

75 Ball Screw Assemblies BASA Screw Assemblies Screw Ends 75 End bearings for screw ends Form 31 Pillow block unit SEC-L Pillow block unit SEC-L Application Bearing LAD 2) Ball Screw Assemblies BASA Module Hex socket Thread Pillow block unit Bearing S t S G t G SEC-L Part number SES-L Part number LAD 2) Part number R R M4 6 R M5 8 R M6 9 R R R M6 9 R R M8 12 R R R M10 15 R M12 18 R R R M12 18 R M20 30 R M24 36 R ) Items delivered per bearing LAD: 1 bearing, 2 retaining rings. Two sets are required for applications with Form 31. R ( ), Bosch Rexroth AG

76 76 Screw Assemblies Ball Screw Assemblies BASA Screw Ends Form 41 Option (machining of end face) K None Z t Z Z Undercut Form E DIN 509 L 4 LS 1 Undercut for retaining ring DIN 471 S t S S 41 D 1 S 1 ST1 G t G G L jl Ordering code: BASA 20x5R x 3 SEM-E-S T7 R 41Z120 82Z Form Version 1) Size (mm) Centering hole d 0 P L jl D 1 L 4 S 1 ST1 LS 1 Z t Z j6 H /2/ h /5/ h /10/ h M /10/20/ h M /10/20/ h M /10/20/ h M /10/ h M /10/20/32/ h M / h M /10/20/32/ h M /10/ h M /10/12/16/20/ h M /10/12/16/20/25/ h M /20/ h M / h M ) The allocation of screw ends to the bearing units is defined by the version. Bosch Rexroth AG, R ( )

77 Ball Screw Assemblies BASA Screw Assemblies Screw Ends 77 End bearings for screw ends Form 41 Pillow block unit SEB-L Pillow block unit SED-L-S Application Bearing LAD 2) Ball Screw Assemblies BASA Module Hex socket Thread Bearing Pillow block unit Pillow block unit S t S G t G LAD 2) SEB-L SED-L-S Part number Part number Part number R R R R M4 6 R R M5 8 R R M6 9 R M6 9 R M6 9 R R M8 12 R R M8 12 R M10 15 R M10 15 R M12 18 R R M12 18 R R M20 30 R R M24 36 R R ) Items delivered: 1 bearing, 2 retaining rings. R ( ), Bosch Rexroth AG

78 78 Screw Assemblies Ball Screw Assemblies BASA Screw Ends Form 51, 51A, 52, 52A Undercut Form E DIN 509 Thread undercut DIN 76 short Option (machining of end face) K None Z t Z Z 51 51A D 1 G 1 S t S S Undercut Form E DIN 509 b x l x t 52 52A G t G G SW L 1 LG 1 L jl b SW l SW Ordering code: BASA 20x5R x 3 SEM-E-S T7 R 52AZ120 82Z Form Version 1) Size (mm) Keyway as per DIN 6885 d 0 P L jl D 1 L 1 G 1 LG 1 b l t h6 P9 51/51A /5/ M6x /10/ M10x /10/20/ M12x /10/ M17x /10/20/32/ M20x /10/20/32/ M20x /10/12/16/20/ M25x /10/12/16/20/ M30x /10/12/16/20/25/ M30x /10/12/16/20/ M30x M35x /10/20/ M35x /20/ M40x /20/ M40x / M50x /52A /5/ M8x /10/ M10x /10/20/ M12x /10/ M17x /10/20/32/ M20x /10/12/16/20/ M25x /10/12/16/20/ M30x /10/12/16/20/25/ M35x /20/ M40x / M50x ) The allocation of screw ends to the bearing units is defined by the version. Bosch Rexroth AG, R ( )

79 Ball Screw Assemblies BASA Screw Assemblies Screw Ends 79 End bearings for screw ends Form 51, 51A, 52, 52A Pillow block unit SEB-F Application Bearing unit LAN Bearing unit LAF Ball Screw Assemblies BASA Pillow Block Unit Bearing Centering hole Hex socket Thread Wrench size SEB-F LAF LAN Z tz S t S G t G SW bsw ISW Part number Part number Part number R R M M R R M M R R R M M R R R M M R R R M M M M R R R M M R R R M M R R R M M M M R R R M M M M R R R M M M M R R R M3 9.0 M M M M M M M M M M M M M M M M M M M R ( ), Bosch Rexroth AG

80 80 Screw Assemblies Ball Screw Assemblies BASA Screw Ends Form 61, 62 Undercut Form E DIN 509 Undercut for retaining ring DIN 471 (3x) Option (machining of end face) K None Z t Z Z L 4 Undercut Form E DIN 509 L 4 LS 1 61 D 1 S 1 ST1 D 2 S t S S b x l x t G t G 62 G L 5 L 1 L2 L jl Ordering code: BASA 20x5R x 3 SEM-E-S T7 R 62Z120 51Z Form Version 1) Size (mm) d 0 P L jl D 1 L 1 D 2 L 2 L 4 L 5 S 1 ST1 LS 1 j6 h7 H /2/ h /5/ h /10/ h /10/20/ h /10/20/ h /10/ h /10/20/32/ h /10/20/32/ h /10/12/16/20/ h /10/12/16/20/25/ h /20/ h / h /10/ h /10/20/ h /10/20/ h /10/ h /10/20/32/ h /10/20/32/ h /10/12/16/20/ h /10/12/16/20/25/ h /20/ h / h ) The allocation of screw ends to the bearing units is defined by the version. Bosch Rexroth AG, R ( )

81 Ball Screw Assemblies BASA Screw Assemblies Screw Ends 81 End bearings for screw ends Form 61, 62 Bearing LAD 2) Application Ball Screw Assemblies BASA Bearing unit Keyway per DIN 6885 Centering hole Hex socket Thread b l t Z t Z S t S G t G LAD 2) P9 Part number R R M3 9.0 M3 5 R M M4 6 R M M5 8 R M M6 9 R M M6 9 R M M8 12 R M M10 15 R M M12 18 R M M16 24 R M M24 36 R M3 9.0 M3 5 R M M4 6 R M M5 8 R M M6 9 R M M6 9 R M M8 12 R M M10 15 R M M12 18 R M M16 24 R M M24 36 R ) Items delivered per unit: 1 bearing, 2 retaining rings. Two sets are required for applications with Form R ( ), Bosch Rexroth AG

82 82 Screw Assemblies Ball Screw Assemblies BASA Screw Ends Form 71, 72 Undercut Form E DIN 509 Undercut for retaining ring DIN 471 Option (machining of end face) K None Z t Z Z L 4 LS 1 Undercut Form E DIN D 1 S 1 ST1 D 2 S t S S b x l x t G t G G 72 L 1 L 2 L jl Ordering code: BASA 20x5R x 3 SEM-E-S T7 R 72Z120 51Z Form Version 1) Size (mm) d 0 P L jl D 1 L 1 D 2 L 2 L 4 S 1 ST1 LS 1 j6 h7 H /2/ h /5/ h /10/ h /10/20/ h /10/20/ h /10/ h /10/20/32/ h /10/20/32/ h /10/12/16/20/ h /10/12/16/20/25/ h /20/ h / h /10/ h /10/20/ h /10/20/ h /10/ h /10/20/32/ h /10/20/32/ h /10/12/16/20/ h /10/12/16/20/25/ h /20/ h / h ) The allocation of screw ends to the bearing units is defined by the version. Bosch Rexroth AG, R ( )

83 Ball Screw Assemblies BASA Screw Assemblies Screw Ends 83 End bearings for screw ends Form 71, 72 Bearing LAD 2) Application Ball Screw Assemblies BASA Bearing unit Keyway per DIN 6885 Centering hole Hex socket Thread b l t Z t Z S t S G t G LAD 2) P9 Part number R R M3 9.0 M3 5 R M M4 6 R M M5 8 R M M6 9 R M M6 9 R M M8 12 R M M10 15 R M M12 18 R M M16 24 R M M20 30 R M3 9.0 M3 5 R M M4 6 R M M5 8 R M M6 9 R M M6 9 R M M8 12 R M M10 15 R M M12 18 R M M16 24 R M M20 30 R ) Items delivered: 1 bearing, 2 retaining rings. R ( ), Bosch Rexroth AG

84 84 Screw Assemblies Ball Screw Assemblies BASA Screw Ends Form 81, 81A, 82, 82A Undercut Form E DIN 509 Thread undercut DIN 76 short Undercut Form E DIN 509 Option (machining of end face) K None Z t Z Z 81 81A D 1 G 1 D 2 S t S S b x l x t 82 82A G t G G SW L 1 LG 1 L 2 L jf b SW l SW Ordering code: BASA 20x5R x 3 SEM-E-S T7 R 82AZ120 41Z Form Version 1) Size (mm) Keyway per DIN 6885 Centering hole d 0 P L jf D 1 L 1 D 2 L 2 G 1 LG 1 b l t Z t Z h6 h7 P9 81/81A /5/ M6x /5/ M6x /10/ M10x M /10/20/ M12x M /10/20/ M12x M /10/20/ M12x M /10/ M15x M /10/ M17x M ) 25 5/10/ M17x M /10/20/32/ M20x M /10/20/32/ M20x M /10/20/32/ M20x M /12/16/20/ M25x M /10/12/16/20/ M30x M /10/12/16/20/ M30x M /12/16/20/ M30x M /12/16/20/ M30x M /12/16/20/25/ M30x M M35x M /20/ M40x M / M50x M /82A /10/ M10x M /10/20/ M12x M /10/20/ M12x M /10/ M17x M ) 25 5/10/ M17x M /10/20/32/ M20x M /10/20/32/ M20x M /12/16/20/ M25x M /10/12/16/20/ M30x M /10/12/16/20/ M30x M /12/16/20/ M30x M /12/16/20/ M30x M /12/16/20/25/ M30x M M35x M /20/ M40x M / M50x M ) The allocation of screw ends to the bearing units is defined by the version. 2) Version 173 only available in Form 81A/82A Bosch Rexroth AG, R ( )

85 Ball Screw Assemblies BASA Screw Assemblies Screw Ends 85 End bearings for screw ends Form 81, 81A, 82, 82A Pillow block unit SEC-F Pillow block unit SEB-F Pillow block unit SES-F Application Bearing unit LAF Bearing unit LAN Bearing LAL Ball Screw Assemblies BASA Hex socket Thread Wrench size Pillow block unit for motor attachment Bearing unit S t S G t g SW bsw ISW SEC-F SEB-F SES-F LAF LAN LAL Part number Part number Part number Part number Part number Part number R R R M R R M R R R R R M R M R R R M R M R R R R M R R R M R R R M R R R R M R M R R R M R R R M R R M R M M R R R M R R R M R R R M R R R M R R M R R R R R M R R R M R R R R M R R R M R R R M R R R R M R R R M R R R M R R M R M M R R R M R R R M R R R M R R R R ( ), Bosch Rexroth AG

86 86 Screw Assemblies Ball Screw Assemblies BASA Screw Ends Form 831, 83, 83A, 841, 84, 84A Mechanically connected Undercut Form E DIN 509 Thread undercut DIN 76 short Undercut Form E DIN 509 Option (machining of end face) K None Z t Z Z 831/83 83A D F D R D 1 G 1 D 2 S t S S L F b x l x t G t G 841/84 G 84A SW L 1 LG 1 L 2 L R L jf b SW l SW Ordering code: BASA 20x5R x 3 SEM-E-S T7 R 83Z200 51Z Form Version 1) Size (mm) Centering hole d 0 P L jf D 1 L 1 D 2 L 2 G 1 LG 1 D R L R D F L F Z t Z h6 h / M6x / M6x /2/ M6x /2/ M6x /5/ M12x M /5/ M12x M /10/ M12x M /10/ M17x M /83A /10/20/ M20x M /10/ M25x M /10/20/32/ M30x M /10/12/16/20/ M40x M /10/12/16/20/25/ M50x M /5/ M12x M /10/ M17x M /84A /10/20/ M20x M /10/ M25x M /10/20/32/ M30x M /10/12/16/20/ M40x M /10/12/16/20/25/ M50x M ) The allocation of screw ends to the bearing units is defined by the version. Bosch Rexroth AG, R ( )

87 Ball Screw Assemblies BASA Screw Assemblies Screw Ends 87 End bearings for screw ends Form 831, 83, 83A, 841, 84, 84A Bearing unit LAF Bearing unit LAN Application Shown with slotted nut NMA Shown with slotted nut NMZ Bearing LAL Ball Screw Assemblies BASA Shown with slotted nut NMG Keyway as per Bearing unit Hex socket Thread Wrench size DIN 6885 Bearing Bearing S t S G t G SW b SW I SW b l t LAF LAN LAL P9 Part number Part number Part number R R R M4 6 R M4 6 R M4 6 R M6 9 R R M R R M M R R M R R M R R M R M R R M R R M M R R M R R M R R R ( ), Bosch Rexroth AG

88 88 Screw Assemblies Ball Screw Assemblies BASA Screw Ends Form 8A, 8AB, 8B, 8BB Undercut Form E DIN 509 Thread undercut DIN 76 short Undercut Form E DIN 509 Option (machining of end face) K None Z t Z Z 8A 8AB D F D R D 1 G 1 D 2 S t S S SW b x l x t 8B G t G 8BB G b SW L 1 L G1 L 2 L F L R L jf Ordering code: BASA 20x5R x 3 SEM-E-S T7 R 8BBZ150 41Z Form Version 1) Size (mm) Mechanical connection (mm) Keyway as per DIN 6885 d 0 P L jf D 1 h6 L 1 D 2 h7 L 2 G 1 L G1 D R L R D F L F b P9 l t 8A /10/ M15x AB /10/ M17x / M20x / M20x /10/ M25x /10/ M25x M30x /20/ M30x M40x /20/ M40x B 8BB /10/ M15x /10/ M17x / M20x / M20x /10/ M25x /10/ M25x M30x /20/ M30x M40x /20/ M40x ) The allocation of screw ends to the bearing units is defined by the version. Bosch Rexroth AG, R ( )

89 Ball Screw Assemblies BASA Screw Assemblies Screw Ends 89 End bearings for screw ends Form 8A, 8AB, 8B, 8BB Pillow block unit SED-F-Z Application Pillow block unit SEE-F-Z Ball Screw Assemblies BASA Module Centering hole Hex socket Thread Wrench size Pillow block unit SED-F-Z SEE-F-Z Z t z S t S G t G SW b SW Part number Part number M M R M M R M M R M M R M M R M M R M M R M M R M M R M M R M M R M M R M M R M M R M M R M M R M M R M M R M M R M M R R ( ), Bosch Rexroth AG

90 90 Screw Assemblies Ball Screw Assemblies BASA Screw Ends Form 91, 91A, 92, 92A Undercut Form E DIN 509 Thread undercut DIN 76 short Option (machining of end face) K None Undercut Form E DIN A D 1 G 1 D 2 D 3 b x l x t 92 92A SW L 1 LG 1 L 1 L 3 L jf b SW l SW Ordering code: BASA 20x5R x 3 SEM-E-S T7 R 92AK120 41Z Form Version 1) Size (mm) d 0 P L jf D 1 L 1 D 2 L 2 D 3 L 3 G 1 LG 1 h6 h7 h7 91/91A /5/ M6x /10/ M10x /10/20/ M12x /10/ M17x /10/20/32/ M20x /12/16/20/ M25x /10/12/16/20/ M30x /12/16/20/25/ M30x M35x /20/ M40x / M50x /92A /10/ M10x /10/20/ M12x /10/ M17x /10/20/32/ M20x /12/16/20/ M25x /10/12/16/20/ M30x /12/16/20/25/ M30x M35x /20/ M40x / M50x ) The allocation of screw ends to the bearing units is defined by the version. Bosch Rexroth AG, R ( )

91 Ball Screw Assemblies BASA Screw Assemblies Screw Ends 91 End bearings for screw ends Form 91, 91A, 92, 92A Pillow block unit SEB-F Application Bearing unit LAF Bearing unit LAN Ball Screw Assemblies BASA Shown with slotted nut NMA Shown with slotted nut NMZ Module Keyway as per DIN 6885 Wrench size Pillow block unit Bearing b l t SW b SW I SW SEB-F LAF LAN P9 Part number Part number Part number R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R ( ), Bosch Rexroth AG

92 92 Screw Assemblies Ball Screw Assemblies BASA Screw Ends Form 931, 93, 93A, 941, 94, 94A Mechanically connected Undercut Form E DIN 509 Thread undercut DIN 76 short Undercut Form E DIN 509 Option (machining of end face) K None 931/93 93A D 3 D F D R D 1 G 1 D 2 L F 941/94 94A b x l x t SW L 1 LG 1 L 2 L 3 L R L jf b SW l SW Ordering code: BASA 20x5R x 3 SEM-E-S T7 R 93K200 41Z Form Version 1) Size (mm) d 0 P L jf D 1 L 1 D 2 L 2 D 3 L 3 G 1 LG 1 D R L R D F L F max h6 h7 h /2/ M6x /5/ M12x /10/ M17x /93A /10/20/ M20x /10/ M25x /10/20/32/ M30x /10/12/16/20/ M40x /10/12/16/20/25/ M50x /5/ M12x /10/ M17x /94A /10/20/ M20x /10/ M25x /10/20/32/ M30x /10/12/16/20/ M40x /10/12/16/20/25/ M50x ) The allocation of screw ends to the bearing units is defined by the version. Bosch Rexroth AG, R ( )

93 Ball Screw Assemblies BASA Screw Assemblies Screw Ends 93 End bearings for screw ends Form 931, 93, 93A, 941, 94, 94A Pillow block unit SEB-F Application Bearing unit LAF Bearing unit LAN Ball Screw Assemblies BASA Shown with slotted nut NMA Shown with slotted nut NMZ Module Keyway as per DIN 6885 Wrench size Pillow block unit Bearing b l t SW b SW I SW SEB-F LAF LAN P9 Part number Part number Part number R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R ( ), Bosch Rexroth AG

94 94 Screw Assemblies Ball Screw Assemblies BASA Screw Ends Form 9A, 9AB, 9B, 9BB Undercut Form E DIN 509 Thread undercut DIN 76 short Option (machining of end face) K None Undercut Form E DIN 509 9A 9AB D F D R D 1 G 1 D 2 SW D 3 b x l x t 9B 9BB b SW L F L R L 1 L G1 L 2 L 3 L jf Ordering code: BASA 20x5R x 3 SEM-E-S T7 R 9ABK170 41Z Form Version 1) Size (mm) Mechanical connection (mm) 9A 9AB 9B 9BB d 0 P L jf D 1 h6 L 1 D 2 h7 L 2 G 1 D 3 h7 L 3 L G1 D R L R D F L F /10/ M15x /10/ M17x / M20x / M20x /10/ M25x /10/ M25x M30x /20/ M30x M40x /20/ M40x /10/ M15x /10/ M17x / M20x / M20x /10/ M25x /10/ M25x M30x /20/ M30x M40x /20/ M40x ) The allocation of screw ends to the bearing units is defined by the version. Bosch Rexroth AG, R ( )

95 Ball Screw Assemblies BASA Screw Assemblies Screw Ends 95 End bearings for screw ends Form 9A, 9AB, 9B, 9BB Pillow block unit SED-F-Z Application Pillow block unit SEE-F-Z Ball Screw Assemblies BASA Module Keyway as per DIN 6885 Wrench size Pillow block unit SED-F-Z SEE-F-Z b P9 l t SW b SW Part number Part number R R R R R R R R R R R R R R R R R R R R R ( ), Bosch Rexroth AG

96 96 Screw Assemblies Ball Screw Assemblies BASA Screw Ends Form A1, A1A, A2, A2A Undercut Form E DIN 509 Undercut Form E DIN 509 Thread undercut DIN 76 short Option (machining of end face) K None Z t Z Z A1 A1A D 1 D 2 G 1 D 3 S t S S Undercut Form E DIN 509 b x l x t A2 A2A SW L 1 L 2 LG 1 L 3 G t G G L jf b SW l SW Ordering code: BASA 25x5R x 3 SEM-E-S T7 R A1K170 41Z Form Version Size (mm) Keyway Centering hole d 0 P L jf D 1 L 1 D 2 L 2 D 3 L 3 G 1 LG 1 b l t Z t z h6 h7 h7 P9 A1/A1A /10/ M15x M /10/20/ M17x M /12/16/20/ M20x M M25x M /12/16/20/25/ M25x M M30x M /20/ M35x M / M40x M A2/A2A /10/ M15x M /10/20/ M17x M /12/16/20/ M20x M M25x M /12/16/20/25/ M25x M M30x M /20/ M35x M / M40x M Bosch Rexroth AG, R ( )

97 Ball Screw Assemblies BASA Screw Assemblies Screw Ends 97 Ball Screw Assemblies BASA Hex socket Thread Wrench size S ts G t G SW b SW l SW 4 4 M M M M M M M M M M M M M M M M R ( ), Bosch Rexroth AG

98 98 Screw Assemblies Ball Screw Assemblies BASA Accessories Overview Rexroth offers an extensive range of accessories for ball screw assemblies. These include nut housings, pillow block units, bearings, slotted nuts, and Front Lube Units. Further information is provided in this section. Bosch Rexroth AG, R ( )

99 Ball Screw Assemblies BASA Screw Assemblies Accessories 99 Ball Screw Assemblies BASA R ( ), Bosch Rexroth AG

100 100 Screw Assemblies Ball Screw Assemblies BASA Accessories Nut Housing MGS Steel nut housings MGS are designed for FEM-E-S, FDM-E-S, FEP-E-S, SEM-E-S and FSZ-E-S nuts. In addition to bolting, the housings should be locked in place by positive means (e.g. two pins with a diameter equal to that of the screws S 2 ). We recommend using screws with a strength class of 8.8. Tightening torque see Installation in the machine on page 155 Reference edges are formed on both sides. c c If a ball screw assembly with a Front Lube Unit is used, the Front Lube Unit may project beyond the housing. This must be considered when calculating the stroke. Size Part number Weight Hole pattern Hex socket cap screw (kg) FEM-E-B / FEM-E-S / SEM-E-S ISO 4762 d 0 x P x D w FEP-E-S, FSZ-E-S 16x5R/L x 3 R BB3 BB7 M8 16x10R x 3 16x16R x 3 R BB4 BB7 M8 20x5R/L x 3 20x10R x 3 20x20R x 3.5 R BB4 BB7 M8 20x40R x x5R/L x 3 25x10R x 3 25x25R x 3.5 R BB4 BB7 M10 32x5R/L x x10R x x20R x R BB4 BB7 M12 32x32R x x64R x x5R/L x x10R/L x 6 R BB4 BB7 M14 40x20R x 6 40x40R x 6 R BB4 BB7 M16 50x5R x 3.5 R BB4 BB7 M14 50x10R x 6 R BB4 BB7 M16 50x16R x 6 50x20R x 6.5 R BB4 BB7 M16 50x40R x x10R x 6 80x10R x 6.5 R BB4 BB7 M16 Bosch Rexroth AG, R ( )

101 2 T 1 L Ball Screw Assemblies BASA Screw Assemblies Accessories x B B S 1 S T 2 S 2 E 2 A N 6x60 H H 1 H D 1 E 1 D 6 Ball Screw Assemblies BASA for size 16x5/16x x 90 BB4/BB7 BB3 / BB7 Size d 0 x P x D w (mm) D 1 H7 D 6 A B ±0.01 H ±0.01 H 1 H 2 E 1 E 2 N S S 1 T 1 S 2 T 2 Clamping length L 16x5R/L x ± ± M10 15 M x10R x 3 16x16R x ± ± M10 15 M x5R/L x 3 20x10R x 3 20x20R x ± ± M10 15 M x40R x x5R/L x 3 25x10R x 3 25x25R x ± ± M12 15 M x5R/L x x10R x x20R x ± ± M16 20 M x32R x x64R x x5R/L x 6 40x10R/L x ± ± M18 25 M x20R x 6 40x40R x ± ± M20 30 M x5R x ± ± M18 30 M x10R x ± ± M20 30 M x16R x 6 50x20R x ± ± M20 30 M x40R x x10R x 6 80x10R x ± ± M20 30 M R ( ), Bosch Rexroth AG

102 102 Screw Assemblies Ball Screw Assemblies BASA Accessories Nut Housing MGD Steel nut housings MGD are designed for FEM-E-C, FDM-E-C, SEM-E-C, FSZ-E-B and FED-E-B ball nuts In addition to bolting, the housings should be locked in place by positive means (e.g. two pins with a diameter equal to that of the screws). We recommend using screws with a strength class of 8.8. Tightening torque see Installation in the machine on page 155 Reference edges are formed on both sides. cc If a ball screw assembly with a Front Lube Unit is used, the Front Lube Unit may project beyond the housing. This must be considered when calculating the stroke. Size Part number Weight Hole pattern Hex socket cap screw ISO 4762 d 0 x P x D w (kg) 16 x 5R/L x 3 R BB2 M8 16 x 10R x 3 16 x 16R x 3 20 x 5R/L x 3 R BB2 M8 20 x 10R x 3 20 x 20R x x 5R/L x 3 R BB2 M8 25 x 10R x 3 25 x 25R x x 5R/L x 3.5 R BB2 M12 32 x 10R x x 20R x x 32R x x 5R/L x 3.5 R BB1 M14 40 x 10R/L x 6 40 x 12R x 6 40 x 16R x 6 40 x 20R x 6 40 x 40R x 6 50 x 5R x 3.5 R BB1 M16 50 x 10R x 6 50 x 12R x 6 50 x 16R x 6 50 x 20R x x 25R x x 40R x x 10R x 6 R BB1 M16 63 x 20R x 6.5 R BB1 M16 63 x 40R x x 10R x 6.5 R BB1 M16 80 x 20R x 12.7 R BB1 M16 Bosch Rexroth AG, R ( )

103 Ball Screw Assemblies BASA Screw Assemblies Accessories x B S 1 B S T H 1 30 H 2 T 1 S 2 D 1 E 1 BB2 D 6 H BB1 L E 2 A N Ball Screw Assemblies BASA Size (mm) D 1 D 6 A B H H 1 H 2 E 1 E 2 N S S 1 T 1 S 2 T 2 Clamping length d 0 x P x D w H7 ±0.01 ±0.01 L 16 x 5R/L x ± ± M10 15 M x 10R x 3 16 x 16R x 3 20 x 5R/L x ± ± M10 15 M x 10R x 3 20 x 20R x x 5R x ± ± M10 15 M x 10R x 3 25 x 25R x x 5R/L x ± ± M16 20 M x 10R x x 20R x x 32R x x 5R/L x ± ± M18 25 M x 10R/L x 6 40 x 12R x 6 40 x 16R x 6 40 x 20R x 6 40 x 40R x 6 50 x 5R x ± ± M20 30 M x 10R x 6 50 x 12R x 6 50 x 16R x 6 50 x 20R x x 25R x x 40R x x 10R x ± ± M20 30 M x 20R x ± ± M20 30 M x 40R x x 10R x ± ± M20 30 M x 20R x ± ± M20 30 M R ( ), Bosch Rexroth AG

104 104 Screw Assemblies Ball Screw Assemblies BASA Accessories Nut Housing MGA Aluminum nut housings MGA are designed for ZEM-E-S, ZEM-E-K und ZEM-E-A ball nuts. We recommend using screws with a strength class of 8.8. Tightening torque see Installation in the machine on page 155 Reference edges are formed on both sides. Items delivered: Includes set screws, spacer ring, housing nut, key Size Part number Weight Hex socket cap screw for screwing from below ISO 4762 d 0 x P x D W (kg) 20 x 5R x 3 R M8 20 x 10R x 3 20 x 20R x x 5R x 3.5 R M10 32 x 10R x x 20R x x 32R x x 5R x 3.5 R M14 40 x 10R x 6 40 x 20R x 6 40 x 40R x 6 Bosch Rexroth AG, R ( )

105 Ball Screw Assemblies BASA Screw Assemblies Accessories x B B S 1 A - A H 1 T 1 H E 1 L ØD 1 E 2 A H 2 S T 2 S 1 T 3 Ball Screw Assemblies BASA A H A5 Countersink for O-ring 7 x 1.5 A (mm) A B ±0.01 ØD 1 H6 E 1 E 2 H ±0.01 Clamping length H 1 H 2 H A5 S S 1 T 1 T 2 T 3 L M M M R ( ), Bosch Rexroth AG

106 106 Screw Assemblies Ball Screw Assemblies BASA Accessories Pillow Block Unit SEC-F, aluminum Fixed bearing with angularcontact thrust ball bearing LGF-B- The pillow block unit consists of: Precision pillow block housing made of aluminum with reference edge on both sides Angular-contact thrust ball bearing LGF... Slotted nut NMZ The slotted nut is delivered unmounted. Size Complete pillow Angular-contact thrust ball bearing Slotted nut Weight block Load capacities (N) (mm) Designation Designation complete dyn. C stat. C 0 M A d 0 x P Part number (N) (N) d D B (Nm) (kg) 20x5/10/20/40 R LGF-B NMZ 12x x5/10/20/32/64 R LGF-B NMA 20x x5/10/12/16/20/40 R LGF-B NMA 30x Screw end Form 81, 81A, 82, 82A designed for motor mounting, see page A 82 82A Bosch Rexroth AG, R ( )

107 Ball Screw Assemblies BASA Screw Assemblies Accessories 107 Centering diameter D for motor flange B L 4 Fastening thread S 3 x T 3 for motor flange M 2 D 22 D d L 22 L 3 L 2 L 20 L 1 B B V M 10 V 1 M 1 2 x M 1 H 3 H 1 H 2 Ball Screw Assemblies BASA S 2 S 1 Size (mm) B 1 B 2 L 1 L 2 L 3 L 4 L 20 L 22 D 22 M 1 ±0.015 M 2 M 3 H 1 ±0.015 H 2 H 3 S 1 S 2 S 3 T 3 V 1 V 2 d 0 x P 20x5/10/20/ M x5/10/20/32/ M x5/10/12/16/20/ M R ( ), Bosch Rexroth AG

108 108 Screw Assemblies Ball Screw Assemblies BASA Accessories Pillow Block Unit SEC-L, aluminum Floating bearing with DIN 625 deep-groove ball bearing The pillow block unit consists of: Precision pillow block housing made of aluminum with reference edge on both sides Deep-groove ball bearing as per DIN RS Retaining ring DIN 471 Cover All parts are delivered unmounted. Size Complete pillow Deep-groove ball bearing as per DIN 625 Retaining ring as Weight block Load capacities (radial) (mm) Designation per DIN 471 complete dyn. C stat. C 0 DIN d 0 x P Part number (N) (N) d D B (kg) 20x5/10/20/40 R RS 15x x5/10/20/32/64 R RS 20x x5/10/12/16/20/40 R RS 30x Suitable for screw ends: Form 31 Bosch Rexroth AG, R ( )

109 Ball Screw Assemblies BASA Screw Assemblies Accessories 109 M 12 H 12 D H11 d H 13 2 x M 11 M B L 31 B11 B 12 S 11 Ball Screw Assemblies BASA M13 Size (mm) B 11 B 12 L 31 M 11 ±0.015 M 12 M 13 H 11 ±0.015 H 12 H 13 S 11 d 0 x P 20x5/10/20/ x5/10/20/32/ x5/10/12/16/20/ R ( ), Bosch Rexroth AG

110 110 Screw Assemblies Ball Screw Assemblies BASA Accessories Pillow Block Unit SES-F, steel Fixed bearing with angularcontact thrust ball bearing LGF-B-, LGF-C-... The pillow block unit consists of: Precision pillow block housing made of steel with reference edge on both sides Angular-contact thrust ball bearing LGF... Slotted nut NMZ The slotted nut is delivered unmounted. Size Complete pillow Angular-contact thrust ball bearing Slotted nut Weight block Load capacities (N) (mm) Designation Designation complete dyn. C stat. C 0 M A d 0 x P Part number (N) (N) d D B (Nm) (kg) 20x5/10/20/40 R LGF-B NMZ 12x x5/10/25 R LGF-B NMZ 17x x5/10/20/32/64 R LGF-B NMA 20x x5 R LGF-B NMA 30x x10/12/16/20/40 R LGF-C NMA 30x Screw end Form 81, 81A, 82, 82A designed for motor mounting, see page A 82 82A Further information on the bearing pair can be found on page 124. Bosch Rexroth AG, R ( )

111 Ball Screw Assemblies BASA Screw Assemblies Accessories 111 Centering diameter D for motor flange B L 4 M 2 V 1 Fastening thread S 3 x T 3 for motor flange D D 22 L 22 L 2 L 3 L 20 L 1 B 3 S 2 B 2 V x M 1 S 4 x T 4 M 1 S 3 x 20 H 3 H 1 S 1 M 3 H 2 Ball Screw Assemblies BASA S 1 B 1 Size d 0 xp (mm) B 1 B 2 B 3 L 1 L 2 L 3 L 4 L 20 L 22 D 22 M 1 M 2 M 3 H 1 H 2 H 3 S 1 S 2 S 3 S 4 T 3 T 4 V 1 V 2 ±0.015 ± x5/10/20/ M8 M x5/10/ M8 M x5/10/20/32/ M8 M x M10 M x10/12/16/20/ M10 M R ( ), Bosch Rexroth AG

112 112 Screw Assemblies Ball Screw Assemblies BASA Accessories Pillow block unit SES-L, steel Floating bearing with DIN 625 deep-groove ball bearing The pillow block unit consists of: Precision pillow block housing made of steel with reference edge on both sides Deep-groove ball bearing as per DIN RS Retaining ring DIN 471 Cover All parts are delivered unmounted. Size Complete pillow Deep-groove ball bearing as per DIN 625 Retaining ring as Weight complete block Load capacities (radial) (mm) Designation per DIN 471 dyn. C stat. C 0 DIN d 0 x P Part number (N) (N) d D B (kg) 20x5/10/20/40 R RS 15x x5/10/25 R RS 17x x5/10/20/32/64 R RS 20x x5/10/12/16/20/40 R RS 30x Suitable for screw ends: Form 31 Bosch Rexroth AG, R ( )

113 M 12 H x M 11 M 11 B 11 B M 13 S 11 D d H 11 H 12 Ball Screw Assemblies BASA Screw Assemblies Accessories L 31 B Ball Screw Assemblies BASA Size (mm) B 11 B 12 L 31 M 11 M 12 M 13 H 11 H 12 H 13 S 11 d 0 x P ±0.015 ± x5/10/20/ x5/10/ x5/10/20/32/ x5/10/12/16/20/ R ( ), Bosch Rexroth AG

114 114 Screw Assemblies Ball Screw Assemblies BASA Accessories Pillow Block Unit SEB-F Fixed bearing with angularcontact thrust ball bearing LGN-B- LGN-C- The pillow block unit consists of: Precision pillow block housing made of steel with reference edge on both sides Angular-contact thrust ball bearing LGN Slotted nut NMA or NMZ Housing nut GWR The slotted nut is delivered unmounted. Size d 0 x P Complete pillow block Part number Angular-contact thrust ball bearing Slotted nut Weight Load capacities (N) Dimensions (mm) Designation Designation complete dyn. C (N) stat. C 0 (N) d D B M A (Nm) (kg) 6 x 1/2 R LGN-B NMZ 6x x 1/2/2.5 R LGN-B NMZ 6x x 2/5/10 R LGN-B NMZ 6x x 5/10/16 R LGN-B NMZ 10x x 5/10/20/40 R LGN-B NMZ 12x x 5/10/25 R LGN-B NMZ 17x x 5/10/25 R LGN-B NMA 17x x 5/10/20/32/64 R LGN-B NMA 20x x 5/10/20/32/64 R LGN-B NMA 20x x 10/12/16/20/40 R LGN-C NMA 25x x 5 R LGN-B NMA 30x x 5 R LGN-B NMA 30x x 5 R LGN-B NMA 35x x 10/12/16/20/25/40 R LGN-C NMA 30x x 10/20/40 R LGN-A NMA 40x x 10/20 R LGN-A NMA 50x Suitable for screw ends: Form For screws 8 x1/2/2.5: Form 831, A 81 81A 91 91A A 82 82A 92 92A 931 Bosch Rexroth AG, R ( )

115 Ball Screw Assemblies BASA Screw Assemblies Accessories 115 H 4 L 3 45 Lube port sealed with DIN 913 set screw Wrench size SW LGF-B- with slotted nut NMZ D D3 5 d D2 D1 B 1 H 1 B 4 H 2 B 2 H 3 S 3 B 5 2 x M S 2 M S 1 V H 5 H 6 2 x S 3 Ø P LGN-B- with slotted nut NMA D D3 LGN-C- with slotted nut NMA B B 3 B 3 B B 7 B B 7 d D2 D1 Ball Screw Assemblies BASA B 4 B 8 4 x S 1 / S 2 L 4 Ø P D D3 d D2 D1 B 3 B B 7 Size (mm) d 0 x P M js7 L 3 L 4 H 1 H 2 ±0.02 H 3 H 4 H 5 H 6 B 1 B 2 B 3 B 4 B 5 B 6 B 7 B 8 V S 1 S 2 S 3 SW D 1 D 2 D 3 P 6 x 1/ M M26x x 1/2/ M M26x x 2/5/ M M26x x 5/10/ M M36x x 5/10/20/ M M45x x 5/10/ M M50x x 5/10/ M M50x x 5/10/20/32/ M M55x x 5/10/20/32/ M M55x x 10/12/16/20/ M M62x x M M65x x M M65x x M M78x x 10/12/16/20/25/ M M78x x 10/20/ M M95x x 10/ M M115x H12 R ( ), Bosch Rexroth AG

116 116 Screw Assemblies Ball Screw Assemblies BASA Accessories Pillow Block Unit SEB-L Floating bearing with DIN 625 deep-groove ball bearing The pillow block unit consists of: Precision pillow block housing made of steel with reference edge on one side Deep-groove ball bearing as per DIN RS Retaining ring DIN 471 Cover All parts are delivered unmounted. Size Complete pillow Deep-groove ball bearing as per DIN 625 Retaining ring as Weight block Load capacities (radial) (mm) Designation per DIN 471 complete dyn. C stat. C 0 DIN d 0 x P Part number (N) (N) d D B (kg) 8 x 1/2/2.5 R RS 5x x 2/5/10 R RS 6x x 5/10/16 R RS 10x x 5/10/20/40 R RS 12x x 5/10/25 R RS 17x x 5/10/20/32/64 R RS 20x x 5 R RS 30x x 10/12/16/20/40 R RS 30x x 5 1) R RS 35x x 10/12/16/20/25/40 1) R RS 35x x 10/20/40 1) R RS 50x x 10/20 1) R RS 60x ) without cover Suitable for screw ends: Form Bosch Rexroth AG, R ( )

117 Ball Screw Assemblies BASA Screw Assemblies Accessories 117 L 3 45 B B2 H1 H2 H4 H 3 L 1 M S 1 S 2 V H 5 D d B D B1 Ball Screw Assemblies BASA L 4 Size (mm) L 1 L 3 L 4 H 1 H 2 H 3 H 4 H 5 B 1 B 2 M V S 1 S 2 Cover d 0 x P ±0.02 js7 H12 B D 8 x 1/2/ M x 2/5/ M x 5/10/ M x 5/10/20/ M x 5/10/ M x 5/10/20/32/ M x M x 10/12/16/20/ M x M14 50 x 10/12/16/20/25/ M14 63 x 10/20/ M14 80 x 10/ M20 R ( ), Bosch Rexroth AG

118 118 Screw Assemblies Ball Screw Assemblies BASA Accessories Pillow Block Unit SED-F-Z Fixed bearing with angularcontact thrust ball bearing The pillow block unit consists of: Precision pillow block housing made of steel 2 pre-tensioned angular-contact thrust ball bearings Slotted nut Cover Radial shaft seal Size Complete pillow block Angular-contact thrust ball bearing Slotted nut dyn. C stat. C 0 max. axial load (mm) M A d 0 Part number (N) (N) (N) d D B (Nm) 20 R R R Suitable for screw ends: Form 8A 8AB 8B 8BB 9A 9AB 9B 9BB Bosch Rexroth AG, R ( )

119 Ball Screw Assemblies BASA Screw Assemblies Accessories 119 E ØY C 1 B C 2 F H Z ØD C Ød W A ØX N L J K Ball Screw Assemblies BASA Q 1 Q P Q SED-F-Z 15 SED-F-Z Size (mm) Weight complete m d 0 A H C E F L J K C 1 C 2 N Q 1 P Q W X Y Z (kg) R ( ), Bosch Rexroth AG

120 120 Screw Assemblies Ball Screw Assemblies BASA Accessories Pillow Block Unit SED-L-S Floating bearing with deepgroove ball bearing The pillow block unit consists of: Pillow block housing made of steel Deep groove ball bearing Retaining ring Size Complete pillow block Deep groove ball bearing Load capacities, radial (mm) d 0 Part number dyn. C stat. C 0 d D B (N) (N) 20 R R R Suitable for screw ends: Form 41 Bosch Rexroth AG, R ( )

121 Ball Screw Assemblies BASA Screw Assemblies Accessories 121 E B ØY H F C W A ØX Z R/2 R/2 R Ød ØD Ball Screw Assemblies BASA Size (mm) Weight complete m d 0 A H C E F R W X Y Z (kg) R ( ), Bosch Rexroth AG

122 122 Screw Assemblies Ball Screw Assemblies BASA Accessories Flange Bearing Unit SEE-F-Z Fixed bearing with angularcontact thrust ball bearing The bearing unit consists of: Precision flanged housing made of steel 2 pre-tensioned angular-contact thrust ball bearings Slotted nut Cover Radial shaft seal Size Complete pillow Angular-contact thrust ball bearing Slotted nut block dyn. C stat. C 0 max. (mm) d 0 axial load d D B M A Part number (N) (N) (N) (Nm) 20 R R R R R Suitable for screw ends: Form 8A 8AB 8B 8BB 9A 9AB 9B 9BB Bosch Rexroth AG, R ( )

123 Ball Screw Assemblies BASA Screw Assemblies Accessories Z L 6 L 6 ØX ØY 4xP 1) ØW ØV A SEE-F-Z ØD 1 Ød 3 L 1 L 2 L L 3 Ød 3 ØD 2 Ød ØD 3 Ball Screw Assemblies BASA 4xP 1) ØW ØV M 1 ØD B L 5 A SEE-F-Z 40 1) Depth Q Size (mm) Weight complete m d 0 D 1 D 2 D 3 L L 1 L 2 L 3 A d 3 L 6 W X Y Z V P Q (kg) g6 H M M M M M R ( ), Bosch Rexroth AG

124 124 Screw Assemblies Ball Screw Assemblies BASA Accessories Bearing Unit LAF Fixed bearing with angular-contact thrust ball bearing LGF Double-thrust, screw-down, series LGF-B- LGF-A- Double-thrust, screw-down, series LGF-C- The pillow block unit consists of: Angular-contact thrust ball bearing LGF Slotted nut NMA..., NMZ... Size Module Single parts Weight Angular-contact thrust ball bearing with slotted nut Angular-contact thrust ball bearing Slotted nut complete d 0 x P Part number Designation Part number Designation Part number (kg) 20 x 5/10/20/40 R LGF-B-1255 R NMZ 12x1 R x 5/10/25 R LGF-B-1762 R NMZ 17x1 R R NMA 17x1 R x 5/10/20/32/64 R LGF-B-2068 R NMA 20x1 R R NMA 20x1 R x 5 R LGF-B-3080 R NMA 30x1.5 R R NMA 30x1.5 R x 10/12/16/20/40 R LGF-C-2575 R NMA 25x1.5 R x 5 R LGF-B-3590 R NMA 35x1.5 R x 10/12/16/20/25/40 R LGF-C-3080 R NMA 30x1.5 R x 10/20/40 R LGF-B R NMA 40x1.5 R x 10/20 R LGF-A R NMA 50x1.5 R Size Load ratings 1) Bearing friction torque with sealing disk M RL (Nm) Rigidity (axial) R fb (N/µm) Tilting rigidity Limit speed (grease) dyn. C stat. C 0 R kl n G d 0 x P (N) (N) (Nm/mrad) (min 1 ) 20x5/10/20/ x5/10/ x5/10/20/32/ x x10/12/16/20/ x x10/12/16/20/25/ x10/20/ x10/ ) See page 191 for load on bearing Bosch Rexroth AG, R ( )

125 Ball Screw Assemblies BASA Screw Assemblies Accessories 125 LGF-B- LGF-A- with slotted nut NMA M6 B R 0,6 min. LGF-B- with slotted nut NMZ M6 M6 t 0,5 x t D d3 3 LGF-C- with slotted nut NMA M6 B 1 B M6 R 0,3 min. d da Da R 0,6 min. M6 J BB1 Ball Screw Assemblies BASA t d3 D R 0,3 min. d da Da 3 B1 J BB2 Size Dimensions (mm) Mounting dimensions (mm) Mounting holes Hole d D B B 1 J D a d a Number d 3 t pattern d 0 x P min max min max (mm) ( ) 20x5/10/20/ , , , BB1 25x5/10/ BB1 32x5/10/20/32/ BB1 40x BB1 40x10/12/16/20/ BB2 50x BB1 50x10/12/16/20/25/ BB2 63x10/20/ BB1 80x10/ BB1 Suitable for screw ends: Form 51 51A 81 81A 91 91A 52 52A 82 82A 92 92A R ( ), Bosch Rexroth AG

126 126 Screw Assemblies Ball Screw Assemblies BASA Accessories Bearing Unit LAN Fixed bearing with angularcontact thrust ball bearing LGN Double-thrust, series LGN-B- LGF-A- Double-thrust, in pairs, series LGN-C- The pillow block unit consists of: Angular-contact thrust ball bearing LGN Slotted nut NMA..., NMZ... Size Module Single parts Weight Angular-contact thrust ball bearing with slotted nut Angular-contact thrust ball bearing Slotted nut complete d 0 x P Part number Designation Part number Designation Part number (kg) 6 x 1/2 R LGN-B-0624 R NMZ 6x0.5 R x 1/2/2.5 R LGN-B-0624 R NMZ 6x0.5 R x 2/5/10 R LGN-B-0624 R NMZ 6x0.5 R x 5/10/16 R LGN-B-1034 R NMZ 10x1 R x 5/10/20/40 R LGN-B-1242 R NMZ 12x1 R x 5/10/25 R LGN-B-1747 R NMZ 17x1 R R NMA 17x1 R x 5/10/20/32/64 R LGN-B-2052 R NMA 20x1 R R NMA 20x1 R x 5 R LGN-B-3062 R NMA 30x1.5 R R NMA 30x1.5 R x 10/12/16/20/40 R LGN-C-2557 R NMA 25x1.5 R x 5 R LGN-B-3572 R NMA 35x1.5 R x 10/12/16/20/25/40 R LGN-C-3062 R NMA 30x1.5 R x 10/20/40 R LGN-A-4090 R NMA 40x1.5 R x 10/20 R LGN-A R NMA 50x1.5 R Size Load ratings 1) Bearing friction torque with sealing disk Rigidity (axial) Tilting rigidity Limit speed (grease) d 0 x P dyn. C (N) stat. C 0 (N) M RL (Nm) R fb N/µm R kl (Nm/mrad) n G (min 1 ) 6x1/ x1/2/ x2/5/ x5/10/ x5/10/20/ x5/10/ x5/10/20/32/ x x10/12/16/20/ x x10/12/16/20/25/ x10/20/ x10/ ) See page 191 for load on bearing Bosch Rexroth AG, R ( )

127 D Ball Screw Assemblies BASA Screw Assemblies Accessories 127 LGN-B- LGF-A- with slotted nut NMA R 0,6 min. LGN-B- with slotted nut NMZ D Da LGN-C- with slotted nut NMA D a B R 0,3 min. d d a R 0,6 min. R 0,3 min. d d a Ball Screw Assemblies BASA B Size (mm) Mounting dimensions (mm) d D B D a d a d 0 x P min max min max 6 x 1/ x 1/2/ x 2/5/ x 5/10/ x 5/10/20/ x 5/10/ x 5/10/20/32/ x x 10/12/16/20/ x x 10/12/16/20/25/ x 10/20/ x 10/ Suitable for screw ends: Form For screws 8 x 2.5: Form 831, 931 For screws 6 x 1; 6 x 2; 8 x 1; 8 x 2: Form A 52 52A 81 81A 82 82A A 92 92A R ( ), Bosch Rexroth AG

128 128 Screw Assemblies Ball Screw Assemblies BASA Accessories Bearing Unit LAD Floating bearing with deep-groove ball bearing The floating bearing consists of: deep-groove ball bearing as per DIN RS retaining ring DIN 471 (2 pcs) Size Deep-groove ball Single parts Load ratings bearing unit with Deep-groove ball bearing DIN 625 Retaining ring DIN 471 d 0 x P retaining ring, part number Designation Part number Designation Part number dyn. C (N) stat. C 0 (N) 8 x 1/2/2.5 R RS R x0.6 R x 2/5/10 R RS R x0.7 R x 5/10/16 R RS R x1 R x 5/10/20/40 R RS R x1 R R RS R x1 R x 5/10/25 R RS R x1 R x 5/10/20/32/64 R RS R x1.2 R R RS R x1.2 R x 5/10/12/16/20/40 R RS R x1.5 R x 5/10/12/16/20/25/40 R RS R x1.5 R x 10/20/40 R RS R x2 R x 10/20 R RS R x2 R Suitable for screw ends: Form For screws 8 x 1; 8 x 2: Form Bosch Rexroth AG, R ( )

129 D d Ball Screw Assemblies BASA Screw Assemblies Accessories 129 B Ball Screw Assemblies BASA Size (mm) Weight complete d 0 x P d D B (kg) 8 x 1/2/ x 2/5/ x 5/10/ x 5/10/20/ x 5/10/ x 5/10/20/32/ x 5/10/12/16/20/ x 5/10/12/16/20/25/ x 10/20/ x 10/ R ( ), Bosch Rexroth AG

130 130 Screw Assemblies Ball Screw Assemblies BASA Accessories Bearing LAL Fixed bearing with angularcontact thrust ball bearing LGL Double-thrust, screw-down, for inexpensive designs The pillow block unit consists of: Angular-contact thrust ball bearing LGL Slotted nut NMG..., NMZ... Size Module Single parts Angular-contact thrust ball Angular-contact thrust ball bearing unit Slotted nut bearing unit with slotted nut Load ratings 1) d 0 x P Part number Designation Part number dyn. C (N) stat. C 0 (N) Designation Part number 6 x 1/2 R LGL-D-0624 R NMZ 6x0.5 R x 1/2/2.5 R LGL-D-0624 R NMZ 6x0.5 R x 2/5/10 R LGL-D-0624 R NMZ 6x0.5 R x 5/10 R LGL-A-1244 R NMG 12x1 R x 5/10 R LGL-A-1244 R NMG 12x1 R x 5 R LGL-A-1244 R NMG 12x1 R x 5/10 R LGL-A-1547 R NMG 15x1 R x 5/10 R LGL-A-2060 R NMG 20x1 R ) See page 191 for load on bearing Suitable for screw ends: Form 81 81A 831/83 83A 82 82A 841/84 84A Bosch Rexroth AG, R ( )

131 Ball Screw Assemblies BASA Screw Assemblies Accessories 131 n D d d 2 B Ø 0,2 A 1 H n D d m m A 2 A 2 Ball Screw Assemblies BASA B H d 2 A 1 Ø 0,2 Size (mm) Weight of bearing d D A 1) A 2) n m H B d d 0 x P (kg) 6 x 1/ x 1/2/ x 2/5/ x 5/ x 5/ x x 5/ x 5/ R ( ), Bosch Rexroth AG

132 132 Screw Assemblies Ball Screw Assemblies BASA Accessories Slotted Nuts NMA, NMZ and NMG for fixed bearings Slotted nut NMA For maximum vibratory loads For new designs e 0,005 A m g c B f A d D M A = tightening torque for slotted nut F ab = axial breaking load of slotted nut M AG = tightening torque for set screw Designation Part number (mm) M A F ab M AG Weight d D B c m e f g (Nm) (kn) (Nm) (g) NMA 15x1 R M15x M NMA 17x1 R M17x M NMA 20x1 R M20x M NMA 25x1.5 R M25x M NMA 30x1.5 R M30x M NMA 35x1.5 R M35x M NMA 40x1.5 R M40x M NMA 45x1.5 R M45x M NMA 50x1.5 R M50x M NMA 60x2 R M60x M NMA 70x2 R M70x M NMA 90x2 R M90x M NAM 15 to NAM 40 with 4 segments NAM 45 to NAM 90 with 6 segments Slotted nut NMZ For existing designs For timing belt side drive For driven nuts 45 t b 0,005 A A B c m d 1 D d f g M A = tightening torque for slotted nut F ab = axial breaking load of slotted nut M AG = tightening torque for set screw e 0,5 Set screw Designation Part number (mm) M A F ab M AG Weight d D B d 1 c m b t e f g (Nm) (kn) (Nm) (g) NMZ 6x0.5 R M6x M NMZ 10x1 R M10x M NMZ 12x1 R M12x M NMZ 17x1 R M17x M NMA 20x1 R M20x M NMZ 25x1.5 R M25x M NMA 30x1.5 R M30x M NMZ 45x1.5 R M45x M NMZ 55x2 R M55x M NMZ 60x2 R M60x M NMZ 70x2 R M70x M NMZ 80x2 R M80x M NMZ 90x2 R M90x M Bosch Rexroth AG, R ( )

133 Ball Screw Assemblies BASA Screw Assemblies Accessories 133 Assembly tool for slotted nut General-purpose socket wrench insert for slotted nut NMA / NMZ Supplied on request NMA: consisting of components: AMS, ZMS and ZME NMZ: consisting of components: ZMS and ZME Slotted nut NMG For inexpensive designs M A = tightening torque for slotted nut a b D d1 d min. 0,3 B Polyamide insert Designation Part number Dimensions (mm) M A Weight d D B d 1 a b (Nm) (g) NMG 12x1 R M12x NMG 15x1 R M15x NMG 20x1 R M20x Ball Screw Assemblies BASA Housing nut GWR For angular-contact thrust ball bearing LGN For cylindrical single nut ZEM-E-S Note: Use a threadlocker (e.g. Loctite 638) to secure against loosening 0,01 A A D d B g f e M A = tightening torque for housing nut Designation Part number Dimensions (mm) M A Weight D d B e f g (Nm) (g) GWR 18x1 R M18x GWR 23x1 R M23x GWR 26x1.5 R M26x GWR 30x1.5 R M30x GWR 36x1.5 R M36x GWR 40x1.5 R M40x GWR 45x1.5 R M45x GWR 50x1.5 R M50x GWR 55x1.5 R M55x GWR 58x1.5 R M58x GWR 60x1 R M60x GWR 62x1.5 R M62x GWR 65x1.5 R M65x GWR 70x1.5 R M70x GWR 78x2 R M78x GWR 92x2 R M92x GWR 95x2 R M95x GWR 112x2 R M112x GWR 115x2 R M115x R ( ), Bosch Rexroth AG

134 134 Screw Assemblies Ball Screw Assemblies BASA Accessories Ball Screw Assembly with Front Lube Unit Characteristic features Equipped with Rexroth s efficient, series-made Front Lube Unit, a ball screw assembly can attain an exceptionally long travel life without relubrication. Thanks to intensive development work and thorough testing under realistic conditions, the use of Front Lube Units combined with prelubricated ball nuts enables you to achieve lifelong, optimal lubrication of Rexroth Precision Ball Screw Assemblies. From its built-in oil reservoir, the Front Lube Unit delivers the precise amount of oil required to replenish the depleted reserves of oil in the soap matrix of the grease inside the ball nut. The oil is applied directly to the screw thread via the low-friction point-contact zone of the open-pored foam. This optimized delivery minimizes lubricant consumption and allows you to achieve lifelong lubrication. Ecologically sound The Front Lube Unit ideally combines eco-friendliness with costefficiency. It minimizes oil consumption and keeps the surroundings clean. This helps to conserve resources. Further highlights Delivered ready-mounted to the Ball Screw Assembly. Attaches to the end of the ball nut, thus saving space. Can be used in all mounting orientations in both horizontal and vertical installations. Available for almost all ball nut designs in diameters 20 to 40. Easy integration into existing constructions through installation either on the flange side or on the opposite side of single-start nuts. When installed at both ends of the ball nut, also meets the lubrication needs of high-capacity 2-start nuts (FED-E-B). Suitable for all normal conditions of use, except for wet or dusty environments. Lubrication concept This logo indicates that Rexroth Precision Ball Screw Assemblies with prelubed ball nut and Front Lube Unit are lubed for life. Note: The Front Lube Unit is not suitable for use with driven nuts. Lifelong lubrication The effective life of the Rexroth Front Lube Unit matches the service life curve of the Ball Screw Assembly. When operated within the recommended load limits, a Ball Screw Assembly equipped with a Front Lube Unit will require no relubrication, thanks to the optimal delivery of lubricant. Based on our extensive tests, the lubrication performance of the Front Lube Unit can now be reliably predicted for the first time. With a Front Lube Unit from Rexroth, a Ball Screw Assembly can run trouble-free for five years or 300 million revolutions without any relubrication. Structural design of Front Lube Units 1 Seal 2 Housing and cover Material: special plastic 3 Open-pored foam 4 Housing nut 5 Intermediate ring 6 Recirculation cap 7 Ball nut 8 Ball screw Notes When calculating the stroke, consider the dimensions of the Front Lube Unit (VSE). When setting up a system, do not allow the VSE to collide with a stop or other components. 8 Bosch Rexroth AG, R ( )

135 Ball Screw Assemblies BASA Screw Assemblies Accessories 135 Ball Screw Assemblies BASA Contact zone of the open-pored foam R ( ), Bosch Rexroth AG

136 136 Screw Assemblies Ball Screw Assemblies BASA Accessories Ball Nut with Front Lube Unit Front Lube Unit The Front Lube Unit (VSE) has been designed for long-term, maintenance-free operation of Ball Screws. It is attached to the ball nut and delivers lube oil continuously to the rolling elements. For travel up to 300 million revolutions without relubrication. The Front Lube Unit can be combined with the following ball nut designs: FSZ-E-S SEM-E-S FSZ-E-B SEM-E-C FEM-E-S FED-E-B FEM-E-C FDM-E-S FEM-E-D FDM-E-C FEM-E-D Lifelong lubrication Revolutions (x10 6 ) Lifelong lubrication Maintenance-free up to 300 x 10 6 revolutions Relubrication required Normal operating load 1 10 % 15 % 20 % 25 % 30 % relative load (% C) Results confirmed by our extensive tests: 1 For axial loads of 15-35% of the dynamic load rating C, the ball nut will be lubed for life. 2 For axial loads of < 15% of the dynamic load rating C, the ball screw assembly will require no maintenance for up to 300 million revolutions. 3 After 300 million revolutions, the ball nut should be relubricated as usual. The Front Lube Unit does not have to be removed from the ball nut. Lead (mm) Travel s with Front Lube Units 1) (km) ) max. load up to 0.15C Bosch Rexroth AG, R ( )

137 Ball Screw Assemblies BASA Screw Assemblies Accessories 137 Technical Data Ball Screw Assembly with Front Lube Unit R Ø47,5 max. 51 R Ø47,5 max. 51 Ball Screw Assemblies BASA Front Lube Unit D D max. L max. L Note: The Front Lube Unit is delivered readymounted to the Ball Screw Assembly. Only installation by the manufacturer is permitted. Size of VSE Part number (mm) Weight (kg) d 0 x P D L m 20 x 5 R R x 20 R 25 x 5 R R x 10 R 25 x 25 R 32 x 5 R R x 10 R 32 x 20 R 32 x 32 R 40 x 5 R R x 10 R R x 20 R 40 x 40 R R ( ), Bosch Rexroth AG

138 138 Screw Assemblies Ball Screw Assemblies BASA Accessories Ball Nut with Front Lube Unit Ordering example for Front Lube Unit with illustration of mounting direction BASA 32 x 10R x FSZ-E-S T7 R 81K203 31K Front Lube Unit on left, ball nut with initial greasing Nut Unit Front Lube Unit Centering diameter D 1 (VSE) BASA 32 x 10R x FSZ-E-S T7 R 81K203 31K Front Lube Unit at right, ball nut with initial greasing Nut unit Centering diameter D 1 Front Lube Unit (VSE) BASA 40 x 20R x 6 FED-E-B T7 R 81K250 31K Front Lube Unit at both ends, ball nut with initial greasing Front Lube Unit (VSE) Nut unit Centering diameter D 1 Front Lube Unit (VSE) Mounting direction for Front Lube Units to ball nut designs Ball nut design Mounting direction FSZ-E-B 2, 3 FSZ-E-S 2, 3 FEM-E-S 2, 3 FEM-E-C 2, 3 FEM-E-D 2, 3 SEM-E-S 2, 3 SEM-E-C 2, 3 FED-E-B 4 FDM-E-S 2, 3 FDM-E-C 2, 3 FEM-E-D 2, 3 Bosch Rexroth AG, R ( )

139 Ball Screw Assemblies BASA Screw Assemblies Accessories 139 Measuring Pads Alignment of the ball screw assembly in the machine A gauge with a self-aligning contact pad is available from Rexroth for easy alignment of the ball screw assembly. Two pads of different lengths are available, which can be used depending on the screw lead: Part number R , length 33 mm for leads < 20 Part number R , length 50 mm for leads > 20 Safety Nut Dial gauge not supplied as standard with the ball screw assembly Ball Screw Assemblies BASA Assembly/set-up/ features Installation on flange with hex socket screws for fixing the safety nut Centering diameter prevents radial displacement Seal is not mounted on the nut, but on the safety nut. (This keeps dirt out of the space between the safety nut and the screw) Length of the safety nut determines the safety factor (Standard: twice the static load capacity) In the case of multiple-thread screws, multiple-thread safety nuts are used. Recommended installation The force or mass must always lie on the safety nut so that there is no tensile loading of the fastening screws. The fixed bearing of the screw should be at the top of it. Inspection may only be carried out by trained service engineers. Design Please consult our staff Ball nut Seal Screw Balls Safety nut with negative profile Mode of operation The ball nut with safety nut comprises the ball nut e.g. FEM-E-C) and an additional safety nut whose negative profile locks into the screw raceway. The ball nut with safety nut basically works in the same way as a normal ball nut. If the ball nut fails to work (e.g. owing to a loss of balls), the safety nut thread comes into contact with the screw. This prevents an uncontrolled dropping of the nut. Use In critical applications in non-horizontal operation (e.g. in order to prevent damage to property). The safety nut is fitted to the nut from below in the direction of force. Safety nuts are not safety components within the meaning of the Machinery Directive 2006/42/EC. Responsibility for the safety of the structural design / specific application therefore still lies with you and the manufacturer. Particular attention must be paid to ensuring that there are no hazards to people. Therefore, in particular in the case of vertically loaded axes, the structure must incorporate an additional arresting/retention device which prevents a drive component failure! The uncontrolled falling of the nut must be prevented in all cases. R ( ), Bosch Rexroth AG

140 140 Screw Assemblies Ball Screw Assemblies BASA Technical Data Technical Notes ISO defines a ball screw assembly as follows: The ball screw assembly BASA is a unit consisting of a ball screw shaft, ball nut and balls which is able to convert rotary motion into linear motion, and vice versa. Advantages over the Acme screw drive The maximum mechanical efficiency of an Acme screw drive is 50%, whereas a planetary screw assembly can achieve 90%, and a ball screw assembly 98%. Higher life expectancy due to negligible wear during operation Less drive power required No stick-slip effect More precise positioning Higher travel speed Less heat-up Due to their high level of efficiency (low level of friction between the screw and the nut), ball screw assemblies are not self-locking. cc Safety information When installing in a non-horizontal position, customers must check whether separate protection against falling loads, e.g. a safety nut, is required. For particularly critical applications in vertical operation we recommend the use of safety nuts. Please consult us. Efficiency (%) 120 Ball Screw Assembly Planetary Screw Assembly Acme screw Lead angle ( ) Selection criteria for ball screw assemblies The following factors should be considered when selecting the BASA for a given application: degree of accuracy required (lead deviation) in-service load conditions service life critical speed buckling load rigidity/permissible clearance or desired preload characteristic speed (max. permissible linear speed) The following points should be taken into consideration when selecting a BASA that is to be both cost-efficient and optimally designed: The lead is a crucial factor as regards load-bearing capacity (determined by the maximum possible ball diameter) and the drive torque. The calculation of the service life should be based on average loads and average speeds, not on maximum values. In order for us to provide you with a customized solution, installation drawings or sketches of the nut environment should be enclosed. cc Note Radial and eccentric forces relative to the screw must be avoided, as they can affect the BASA's performance and shorten its life. Where special conditions of use are involved, please consult us. Bosch Rexroth AG, R ( )

141 Ball Screw Assemblies BASA Screw Assemblies Technical Data 141 Load ratings and service life We calculate load ratings and service life according to ISO Static load rating C 0 The static load rating is an axial, concentrically acting force that induces a permanent deformation of x the ball diameter between the ball and the ball track. Dynamic load rating C The dynamic load rating is an axial, concentrically acting force of constant magnitude and direction under which 90% of a sufficiently large number of identical BASAs can achieve a nominal service life of one million revolutions. Service life The nominal service life is expressed by the number of revolutions (or number of operating hours at constant speed) that will be attained or exceeded by 90% of a representative sample of identical BASAs before the first signs of material fatigue become evident. The nominal service life is designated as L or L h, depending on whether it is specified in revolutions or hours. Short stroke Short stroke applications = stroke nut length L Lubrication: During a short stroke, the planets do not make a real turn. It is therefore impossible for an adequate lubricating film to form. This may result in premature wear. To avoid this, it is sufficient to perform longer strokes at regular intervals with simultaneous relubrication as lubricating strokes. Please consult our regional centers regarding short stroke applications. You can find your local contact person at: Critical speed and buckling load The critical speed and buckling load can be checked using the corresponding charts. For precise calculations see formula 12 15, in Design Calculations Characteristic speed d 0 n Rexroth BASAs can be operated at very high speeds due to their internal recirculation, so that characteristic speeds of up to 150,000 are possible depending on the nut type. d 0 n 150,000 d 0 = nominal diameter (mm) n = speed (min 1 ) The theoretically possible maximum linear speed v max (m/min) is specified on the page featuring the relevant nut. Actually attainable speeds are heavily dependent among other factors on preload and duty cycle. They are generally restricted by the critical speed. (See Design Calculations ). Material, hardness The ball screw assemblies are made of high-quality, heat-treatable steel, carbon chrome alloy steels, or case-hardened steels. The screw and nut raceways have a minimum Rockwell hardness of HRC 58. Ball screw assemblies made of stainless steel (DIN EN 10088) can be provided on request. The screw ends are not normally hardened. Sealing Ball screw assemblies require protection against contamination. Flat protective covers, bellows type dust boots or the AGK drive unit are particularly suitable for this purpose. As there are many applications in which these methods do not provide sufficient protection, we have developed an additional gapless lip-type seal which ensures an optimal sealing effect and maintains high efficiency levels due to the low friction level. Our ball screw assemblies are therefore supplied with seals as standard. If the customer explicitly states that he does not want a seal, the seal can be omitted or special seals can be used. A strengthened version of the standard seal has been developed for applications where severe contamination of the screw seems unavoidable. The sealing effect has been further improved by increasing the preload. It must be borne in mind that the friction torque is much greater than with a standard seal (see Technical Data), and consequently more heat is also generated. The reinforced seal can be easily distinguished by the dark green color of its exterior. Permissible operating temperatures Ball screw assemblies are suitable for continuous operation at temperatures up to 80 C with temporary peaks of 100 C (measurements taken on the outer shell of the nut). Permissible operating temperatures: 10 C T operation 80 C Permissible bearing temperature 15 C T bearing 80 C Ball Screw Assemblies BASA Load rating: Short stroke applications will increase the number of times a rolling load passes over each point within the load zone. This reduces the load rating. R ( ), Bosch Rexroth AG

142 142 Screw Assemblies Ball Screw Assemblies BASA Technical Data Acceptance Conditions and Tolerance Grades T Permissible travel deviation according to ISO Symbol definitions: (excerpt) l 0 = nominal travel l 1 = thread length l 0 = travel deviation l u = useful travel l e = excess travel (the closer tolerances for travel and hardness do not apply here) c = travel compensation (target travel deviation) (standard: c = 0) e p = tolerance mean target travel deviation ν 300p = permissible travel deviation within 300 mm travel a = actual p = permissible Ball screw assembly with precision screw l e + l 0 l 1 l u 300 ν300p l e l 0 e p e p c = 0 Tolerance grades for precision screws Tolerance grade Permissible travel deviation within 300 mm travel ν 300p (µm) Tolerance grade Permissible deviation within target travel Useful travel l u Permissible deviation within target travel e p (µm) Tolerance grade > Non-usable length l e (Excess travel) Modified with respect to DIN d 0 (mm) (mm) 6, , , 25, 32, , 63, l e Bosch Rexroth AG, R ( )

143 Ball Screw Assemblies BASA Screw Assemblies Technical Data 143 Minimum number of measurements within 300 mm (measuring interval), and excess travel to be taken into consideration. Lead P Minimum number of measurements for tolerance grade (mm) Ball Screw Assemblies BASA R ( ), Bosch Rexroth AG

144 d 0F 144 Screw Assemblies Ball Screw Assemblies BASA Technical Data Acceptance Conditions and Tolerance Grades Run-outs and location deviations based on DIN ISO Radial run-out t 5 of the outer diameter of the screw over the length l 5 used to determine the straightness in relation to AA'. l5 l5 l5 2 d 0 l 1 t 5p A A l5 l5 t 5 max AA' t 5p d 0 A' A' 2 d 0 d 0 l 5 t 5p in µm for l 5 for tolerance grade above up to = l 1 /d 0 t 5max in µm where l 1 4 l 5 Tolerance grade above up to Coaxial deviation t 6 of the bearing journal in relation to AA' where l 6 l. Tabular value t 6p applies if I 6 reference length I. Where l 6 > l, then t 6a t 6p l 6a l t 6p AA' A 2 d 0 l 6 A' d 0 Nominal diameter d 0 Reference length l t 6p in µm where l 6 l Tolerance grade above up to = Coaxial deviation t 7 of the journal diameter of the ball screw shaft in relation to the bearing diameter for l 7 l. Tabular value t 7p applies ifi 7 reference length I. Where l 7 > l, then t 7a t 7p l 7a l l 7 C t 7p C Bearing seat d 0 Nominal diameter d 0 Reference length l t 7p in µm where l 7 l Tolerance grade above up to = Axial run-out t 8 of the shaft (bearing) face of the ball screw shaft in relation to the bearing diameter. t 8p C d F d 0 t 8p in µm Nominal diameter d 0 for tolerance grade above up to = C Bearing seat Axial run-out t 9 of the ball nut location face in relation to A and A' (for preloaded ball nuts only). A D 5 t 9p AA' A' t 9p in µm Flange diameter D 5 for tolerance grade above up to d 0 2 d 0 Bosch Rexroth AG, R ( )

145 Ball Screw Assemblies BASA Screw Assemblies Technical Data 145 Technical Data Radial run-out t 10 of the outer diameter D 1 of the ball nut in relation to A and A' (for preloaded and rotating nuts only). Fix ball screw to prevent it from rotating before carrying out the measurement. Please ask for details of permissible axial and radial run-outs for driven nuts. Tolerance T pp in respect of dynamic drag torque T p0 due to preload (only for preloaded ball nuts) A 2 d 0 D 1 t 10p AA' fixed A' 2 d 0 d 0 Y t 10p in µm Outer diameter D 1 for tolerance grade above up to ± T pa Ball Screw Assemblies BASA F, F t 1 T pp Symbol definitions: X = travel Y = dynamic drag torque with preload 1 = dynamometer T p = F l without oil wiper T t = F t l with oil wiper l n = length of the ball nut l l u l n l u l n T pa X T pp T p0 where l u / d 0 T p0 (Nm) Tolerance grade > T pp (% of T p0 ); l u 4000 mm T pp (% of T p0 ); l u > 4000 mm > > > R ( ), Bosch Rexroth AG

146 146 Screw Assemblies Ball Screw Assemblies BASA Technical Data Preload and rigidity Nut system preload In addition to single nuts with reduced backlash, Rexroth supplies preloaded or adjustable-preload nut systems. Axial movement (deflection) Single nut with backlash preloaded and adjustablepreload nut systems Axial load The rigidity of these different types of Rexroth nut systems is approximately the same at the same preload. Reason: This is because the adjustable-preload single nut and the preloaded single nut have a much more compact design. The screw is typically far less rigid than the nut unit (for details see Overall axial rigidity... ). Preloaded single nut Single nuts can be preloaded to 2%, 3% or 5% of the basic dynamic load rating by means of optimized ball size selection. Adjustable-preload single nut The adjustable-preload single nut allows cost-efficient design techniques to be implemented in a large number of applications. The radial clearance and preload are adjusted radially via a slot approx. 0.1 mm wide, see section Mounting. Depending on the application, we will preload the nut system to 2%, 3% or 5% of the basic dynamic load rating. The maximum preload equals approx. 5% of the basic dynamic load rating. Double nut Tensioning two single nuts against each other eliminates the inherent backlash of the ball screw, increases rigidity, and thus improves positioning accuracy. As excessive preload can cause a reduction in service life, we recommend that it not be more than 1/3 of the average operating load. Depending on the application, we will preload the nut system to 7% or 10% of the basic dynamic load rating. Driven nut FAR Like the single nut, the HP series driven nut can be preloaded to 2%, 3% or 5% of the basic dynamic load rating by means of ball size selection. Flanged single nut FED The HP series flanged single nut is optimally preloaded to 2% or 3% of the dynamic load rating by means of ball size selection. Bosch Rexroth AG, R ( )

147 Ball Screw Assemblies BASA Screw Assemblies Technical Data 147 Rigidity The rigidity of a ball screw is also influenced by all adjoining parts such as bearings, housing bores, nut housings etc. Overall axial rigidity R bs of the ball screw assembly The overall axial rigidity R bs is made up of the component rigidity of the bearing R fb, the screw R S and the nut unitr nu = + + R bs R fb R S R nu 16 Rigidity of the screw R S The rigidity of the screw R S depends on the type of bearing used. See the corresponding tables for rigidity values. 1 Ball screw shaft is fixed at one end. l S1 2 Ball screw shaft is fixed at both ends. S S2 2 l S2 l S Ball Screw Assemblies BASA Note: Please note that in most cases the rigidity R S of the screw will be significantly lower than the rigidity R nu of the nut unit. In an assembly with a diameter of 40 x 10 for example, the rigidity R nu of the nut unit is 2 to 3 times the rigidity R S of a screw with a length of 500 mm. D w d2 d1 d 0 R S2 165 The lowest screw rigidity occurs at the center of the screw R S2min ( l S2 = l S /2) and thus equals: 2 (d 0-0,71 D w ) S2 S S S2 18 Rigidity of the bearing R fb The rigidity of the bearings corresponds to the values found in the bearing manufacturer s catalog. See the corresponding tables in this catalog for rigidity values of the bearings offered by Rexroth. Rigidity in the area of the nut unit R nu The rigidity in the area of the preloaded nut unit is calculated according ISO See the corresponding tables for rigidity values. (d 0-0,71 D w ) R 165 (N/ m) S1 S1 R S1 = rigidity of the screw (N/ d 0 = nominal diameter D w = ball diameter l S1 = distance between bearing and nut 2 17 (N/mm) (mm) (mm) (mm) (d 0-0,71 D ) R S2min 660 (N/µ m) R S2 = rigidity of the screw d 0 = nominal diameter D W = ball diameter l S = distance between bearing and bearing l S2 = distance between bearing and nut S 2 19 (N/mm) (mm) (mm) (mm) (mm) R ( ), Bosch Rexroth AG

148 148 Screw Assemblies Ball Screw Assemblies BASA Technical Data Preload and Overall Rigidity of Single Nuts Dynamic drag torque, preload and rigidity for screws of tolerance grades 3, 5 and 7 with single nuts ZEV-E-S, FEP-E-S (only 2%), FEM-E-S, FEM-E-C, FEM-E-D FSZ-E-S, FSZ-E-B, SEM-E-S and SEM-E-C (note centering diameter D 1 that has to be set) ZEM-E-S, ZEM-E-K, ZEM-E-A, FED-E-B, FAR-B-S T 0 = overall dynamic drag torque T 0 = T pr0 + T RD C = basic dynamic load rating C 0 = static axial load rating T RD = dynamic drag torque of the 2 seals R S = rigidity of the screw R nu = rigidity of the nut T pr0 = dynamic drag torque without seals d 0 = nominal diameter P = lead D w = ball diameter i = number of load-carrying threads on the screw The values given for dynamic drag torque are proven practical indicators for the nut preloading. Note: Measurement of the dynamic load torque, see Mounting on page 155 Size Load ratings Backlash of single nut Rigidity of the screw dyn. C stat. C 0 Standard Reduced R S (N) (N) (mm) (mm) N m D 0 x P x D w - i ( µm ) 6 x 1R x x 2R x x 1R x x 2R x x 2.5R x x 2R x x 5R x x 10R x x 5R x x 5R/L x x 10R x x 16R x x 16R x x 16R x x 5R/L x x 5R x x 10R x x 20R x x 20R x x 20R x x 40R x x 5R x x 5R/L x x 10R x x 10R x x 25R x 25R x x 25R x x 25R x x 5R x x 5R/L x x 10R x x 20R x x 20R x x 20R x x 32R x x 32R x x 32R x x 32R x x 64R x x 5R/L x x 10R/L x x 10R x x 10R x x 12R x x 16R x x 20R x x 20R x x 40R x x 40R x x 40R x x 5R x x 10R x x 10R x x 12R x x 16R x x 20R x x 20R x x 20R x x 25R x x 40R x x 40R x x 40R x For sizes 63 and 80, see next page Bosch Rexroth AG, R ( )

149 Ball Screw Assemblies BASA Screw Assemblies Technical Data 149 Size Preload and Overall Rigidity of Single Nuts 2% preload 3% preload 5% preload R nu T pr0 R nu T pr0 R nu T pr0 (N/mm) (Nm) (N/mm) (Nm) (N/mm) (Nm) D 0 x P x D w - i Tolerance grade 3; 5; 7 Tolerance grade 3; 5; 7 Tolerance grade 3; 5; 7 6 x 1R x x 2R x x 1R x x 2R x x 2.5R x x 2R x x 5R x x 10R x x 5R x x 5R/L x x 10R x x 16R x x 16R x x 16R x x 5R/L x x 5R x x 10R x x 20R x x 20R x x 20R x x 40R x x 5R x x 5R/L x x 10R x x 10R x x 25R x 25R x x 25R x x 25R x x 5R x x 5R/L x x 10R x x 20R x x 20R x x 20R x x 32R x x 32R x x 32R x x 32R x x 64R x x 5R/L x x 10R/L x x 10R x x 10R x x 12R x x 16R x x 20R x x 20R x x 40R x x 40R x x 40R x x 5R x x 10R x x 10R x x 12R x x 16R x x 20R x x 20R x x 20R x x 25R x x 40R x x 40R x x 40R x For sizes 63 and 80, see next page Ball Screw Assemblies BASA R ( ), Bosch Rexroth AG

150 150 Screw Assemblies Ball Screw Assemblies BASA Technical Data Preload and Overall Rigidity of Single Nuts Size Load ratings Backlash of single nut Rigidity of the screw dyn. C stat. C 0 Standard Reduced R S (N) (N) (mm) (mm) N m ( µm ) D 0 x P x D w - i 63 x 10R x x 10R x x 20R x x 20R x x 20R x x 40R x x 40R x x 40R x x 10R x x 20R x Preload and Rigidity of Double Nuts Dynamic drag torque, preload and rigidity for screws of tolerance grade 3, 5. 7 with double nuts FDM-E-S, FDM-E-C, FDM-E-D T 0 = overall dynamic drag torque T 0 = T pr0 + T RD C = basic dynamic load rating C 0 = static axial load rating T RD = dynamic drag torque of the 2 seals R S = rigidity of the screw R nu = rigidity of the nut T pr0 = dynamic drag torque without seals d 0 = nominal diameter P = lead D w = ball diameter i = number of ball track turns The values given for dynamic drag torque are proven practical indicators for the nut preloading. Note: Measurement of the dynamic load torque, see Mounting page 155 Size Load ratings Rigidity of the screw D 0 x P x D w - i dyn. C (N) stat. C 0 (N) N m µm 16 x 5R x x 5R x x 5R x x 10R x x 5R x x 10R x x 5R x x 10R x x 10R x x 20R x x 5R x x 10R x x 10R x x 20R x x 10R x x 10R x x 20R x x 10R x x 20R x R S ( ) Bosch Rexroth AG, R ( )

151 Ball Screw Assemblies BASA Screw Assemblies Technical Data 151 Size Preload and Overall Rigidity of Single Nuts 2% preload 3% preload 5% preload R nu T pr0 R nu T pr0 R nu T pr0 (N/µm) (Nm) (N/µm) (Nm) (N/µm) (Nm) D 0 x P x D w - i Tolerance grade 3; 5; 7 Tolerance grade 3; 5; 7 Tolerance grade 3; 5; 7 63 x 10R x x 10R x x 20R x x 20R x x 20R x x 40R x x 40R x x 40R x x 10R x x 20R x Ball Screw Assemblies BASA Size Rigidity and Dynamic Drag Torque of Double Nuts 7% preload 10% preload R nu (N/µm) (Nm) (N/µm) (Nm) D 0 x P x D w - i Tolerance grade 3; 5; 7 Tolerance grade 3; 5; 7 16 x 5R x x 5R x x 5R x x 10R x x 5R x x 10R x x 5R x x 10R x x 10R x x 20R x x 5R x x 10R x x 10R x x 20R x x 10R x x 10R x x 20R x x 10R x x 20R x T pr0 R nu T pr0 R ( ), Bosch Rexroth AG

152 152 Screw Assemblies Ball Screw Assemblies BASA Technical Data Dynamic drag torque of the seals Seal torque for single and double nuts Size Dynamic drag torque standard seal reinforced seal low-friction seal T 0 = overall dynamic drag torque T 0 = T pr0 + T RD T RD = dynamic drag torque of the 2 seals T pr0 = dynamic drag torque without seals d 0 = nominal diameter P = lead D w = ball diameter Note: Measurement of the dynamic load torque, see Mounting on page 155 d 0 x P x D w T RD approx. T RD approx. T RD = 0 Nm (Nm) (Nm) 6 x 1R x x 2R x x 1R x x 2R x x 2.5R x x 2R x x 5R x x 10R x x 5R x x 10R x x 16R x x 5R x x 5L x x 10R x x 20R x x 40R x x 5R x x 5L x x 10R x x 25R x x 5R x x 5L x x 10R x x 20R x x 32R x x 5R x x 5L x x 10R x x 10L x x 12R x x 16R x x 20R x x 40R x x 5R x x 10R x x 12R x x 16R x x 20R x x 25R x x 40R x x 10R x x 20R x x 40R x x 10R x x 20R x Bosch Rexroth AG, R ( )

153 Ball Screw Assemblies BASA Screw Assemblies Technical Data 153 Please bear in mind the following when changing or retrofitting the seals: All precision screws with small leads are designed as single-start screws (Fig. 1). There is therefore only one ball track on the screw. However, precision screws with higher leads are designed as 2-start or 4-start screws (Figs. 2 and 3). Reinforced seals for precision screws are available as an option. These are identified by their opal-green color and their part number. Low-friction seals for precision screws are available upon request. These are identified by their red-brown color and their part number. Fig. 1 Single-start seal Fig. 2 Seal for 2-start precision screw with average lead Fig. 3 Seal for 2-start precision screw with high lead Standard nuts FED nut Ball Screw Assemblies BASA Inserting the seal Position the nut on the screw as illustrated in the diagram. Insert the seal so that its projection is in the recess and press it in until it snaps into the groove. While turning the nut on the screw, watch the sealing lip carefully and straighten it if necessary by applying pressure to the end surface. Ensure that the lip is not damaged. Detailed mounting instructions are delivered along with the parts mm R ( ), Bosch Rexroth AG

154 154 Screw Assemblies Ball Screw Assemblies BASA Mounting Mounting Condition as delivered Rexroth ball screw assemblies are normally delivered prelubricated with an initial supply of Dynalub grease. Relubrication with grease or oil is thus possible, and cartridges and cans of this grease are available. If another lubricant is used, you will need to check that it is compatible with the initial supply. For special cases, BASA's can also be supplied with only a preservative coating. This can be indicated by choosing the appropriate option number in the ordering code. cc Note The selected lubricant must be in the nut before the machine is started. Cleaning Various cleaning agents can be used to degrease and wash the assembly: aqueous cleaning agents organic cleaning agents cc Note Immediately after cleaning, thoroughly dry all the parts and apply a preservative coating or anti-corrosion oil. In all cases, take care to observe the appropriate legal regulations (environmental protection, health and safety at work, etc.) as well as the specifications for the cleaning agent (e.g. handling). Storage Ball screw assemblies are high-quality systems that must be treated with due care. In order to prevent damage and contamination, the elements should not be removed from the protective wrapping until immediately before installation. Once they have been removed from the packaging, they must be set down on V-shaped cradles. Nut mounting Preloaded single nut Double nut These models are always supplied with premounted nut units. The nut unit and screw must not be disassembled. Should this become necessary for any reason, please consult us. Note: For Ball Screws with Front Lube Units, do not remove the nut and Front Lube Unit from the screw. Single nut with standard backlash Single nut with reduced backlash Adjustable-preload single nut The nut unit may only be mounted on a screw with machined ends by using a mounting arbor. In this case, the screw spigot serves to center the mounting arbor. On a screw end form 00, a centering hole Z can be used to fit an auxiliary spigot as a mounting aid. The outer diameter of the arbor should be approx. 0.1 mm smaller than the root diameter of the screw. In most cases, the transport arbor that is supplied together with the nuts may be used to mount the nut. The end of the screw thread must be carefully chamfered in order to prevent damage to the seal and the internal components of the nut unit. The various mounting steps are described below. Proceed in reverse order when removing the nut from the screw. Take particular care not to damage the nut, screw or internal components, as this could result in the premature failure of the ball screw assembly. Mounting steps The nut is to be mounted as follows: Remove retaining ring (! Mounting Instructions) from one end of the mounting arbor. Push the mounting arbor with nut until it bears against the end of the thread. The arbor must make contact with no axial clearance. Carefully turn the nut unit onto the thread, applying only slight thrust. Remove the arbor only when the nut unit is fully located on the screw thread. Bosch Rexroth AG, R ( )

155 Ball Screw Assemblies BASA Screw Assemblies Mounting 155 Preload of adjustable-preload single nuts Measurement of the dynamic drag torque for SEM-E-C and SEM-E-S. Using the adjusting screw, reduce the clearance of the nut mounted on the screw until the dynamic drag torque T pr0 is reached as shown in table! page 148 (ball screw assembly lightly oiled). Check this torque along the entire length of the thread; if the torque deviates from the values specified in the table at any point along the thread, adjust accordingly. Once the torque has been properly adjusted, the centering diameter D 1 must correspond to the values specified in Table! page 44 and 46. Cover the head of the screw with a protective cap. Measurement recording e.g. spring gauge D 1 F T r pra = F r Adjusting screw T pra = currently measured dynamic drag torque. Mounting instructions are supplied as standard along with every unit. Please ask for extra copies if needed. Installation in the machine It is not normally necessary to remove the preservative coating before installation. If the ball screw assembly is contaminated, it must first be cleaned (see Cleaning ) and re-oiled Push the nut unit into the mounting bore, taking care to avoid any impact force or misalignment. Tighten the mounting screws using a torque wrench if necessary. Maximum tightening torque for the steel/steel material pairing (R m 370 N/mm 2 ), see table. Steel/steel material pairing Screw diameter (mm) Tightening torque (Nm) Strength class as per DIN ISO M M M M M M M M M M M For the steel/aluminum and aluminum/ aluminum material pairings (R m 280 N/mm 2 ) the maximum tightening torques specified in the follow table apply. When driving screws into aluminum, the length of thread engagement should be at least 1.5 times the screw diameter. Steel/aluminum and aluminum/ aluminum material pairings Screw diameter (mm) Tightening torque (Nm) Strength class as per DIN ISO M M M M M M M M M M M Tightening torques for fastening screws according to VDI 2230 where µ G = µ K = Alignment of the ball screw in the machine A gauge 1) with a self-aligning contact pad is available from Rexroth for easy alignment of the ball screw assembly. Two pads of different lengths are available which are used according to the screw lead: Part number R Length 33 mm for leads < 20 Part number R Length 50 mm for leads < 20 Ball Screw Assemblies BASA Mounting screws cc Always make sure the screws are secure where there are high screw loads! 1) Dial gauge not supplied as standard with the ball screw assembly R ( ), Bosch Rexroth AG

156 156 Screw Assemblies Ball Screw Assemblies BASA Mounting Installation Tolerances cc Note Any alignment errors can lead to premature breakdown of the ball screw assembly! To ensure that a ball screw assembly can actually achieve the calculated service life and performance, its system-related requirements and limitations must be taken into account at the design stage. Screw assemblies are not suitable for transferring radial forces and torques (such as may be caused by misalignments during installation). The following sections illustrate the most important principles for achieving designs that will be compatible with the screw drive system and its requirements. When using ball screw assemblies, the specified installation tolerances must be observed when designing and building the adjoining structures. The first basic principle is: The higher the ball screw assembly's precision and preload, the more accurate the adjoining structures must be. This applies in particular to applications in which the nut travels close up to the end bearings since in this area the risk of distortive stresses and therefore of additional loads is very high. L A 2 d 0 // Y A X A d 0 2 d 0 Parallelism offset and details of the rectangularity between the screw shaft axis and the location face of the nut housing. L = distance between end bearings (mm) d 0 = nominal diameter of screw (mm) X = Permissible operating temperatures: The tolerance applies to a surface that must lie between two planes which are spaced at a distance X from each other and are perpendicular to the reference axis A. (mm) Y = Permissible parallelism offset between the guide and the ball screw axis (mm) The table opposite shows the most important recommended tolerances for ball screw assemblies as a function of the preload. These tolerances include the rectangularity of the nut housing (or adjoining structure) relative to the screw axis. The tolerances for parallelism between the guide and the ball screw axis must also be complied with. Minimum distance of the nut from the end bearings > 2 d 0 Any alignment errors can lead to premature breakdown of the ball screw assembly! Option Preload X (mm) Y (mm) Backlash Preloaded Bosch Rexroth AG, R ( )

157 Ball Screw Assemblies BASA Screw Assemblies Mounting 157 Ball Screw Assemblies BASA R ( ), Bosch Rexroth AG

158 158 Screw Assemblies Ball Screw Assemblies BASA Lubrication Grease lubrication with grease guns or progressive plunger systems for ball screw assemblies > Ø 12 mm Grease We recommend using Dynalub 510, which has the following properties: NLGI grade 2 lithium-based highperformance grease as per DIN (KP2K-20 according to DIN 51825) Good water resistance Corrosion protection Temperature range: 20 to +80 C Under conventional environmental conditions this ground-fiber, homogeneous grease is ideally suitable for the lubrication of linear elements: For loads of up to 50% C For short-stroke applications 1 mm For the permissible speed range for ball screw assemblies The product and material safety data sheets are available on our website at Please also read the notes on page 159! Part numbers for Dynalub 510: R (400 g cartridge) R (25 kg hobbock) Initial lubrication of the ball screws (basic lubrication) Completely assembled ball screws with a diameter greater than Ø 12 mm are prelubricated with Dynalub 510 as standard before shipment. In the case of the supplying of individual parts (nut on mounting arbor) or in versions without prelubrication before delivery, twice the initial lubrication quantity according to Table Relubrication must be applied to the nut via the lube hole prior to commissioning. The positioning and procedural instructions must be followed (see diagram below). When using a progressive plunger system, care should be taken to ensure that all the lines and the piston distributors (including the connection to the BASA nut unit) are filled before carrying out basic lubrication or relubrication. Positioning and procedural instructions horizontal mounting position vertical mounting position Position of the nut during lubricating procedure 2 Flange with lube port (in the case of horizontal mounting the connection should as high up as possible) 3 Direction of travel after lubrication. Travel range at least 3x nut length. Relubrication of the ball screw assembly If the relubrication interval shown in the diagram page 159 has been reached, apply the amount of relubrication shown in the table Lubricant quantities - relubrication on page 160. The nut position and travel range must be as shown in the diagram Positioning and procedural instructions. Bosch Rexroth AG, R ( )

159 Ball Screw Assemblies BASA Screw Assemblies Lubrication 159 Load-dependent relubrication intervals for grease lubrication with grease guns or progressive plunger systems for ball screw assemblies > Ø 12 mm ( dry axes ) The following conditions apply: Grease lubricant Dynalub 510 or alternatively Castrol Longtime PD 2, Elkalub GLS 135/N2 No exposure to process media Standard seals Driven screw No hypercritical operation Ambient temperature: T = 20 to 30 C s = relubrication interval (M revolutions) (10 6 revs.) C = dynamic load rating (N) F m = average load (N) d 0 = nominal diameter (mm) s 100 d 0 Ø 40 mm 50 d 0 > Ø 40 mm 10 F m /C 1 0 0,1 0,2 0,3 0,4 Ball Screw Assemblies BASA Conversion of the relubrication interval s from M revolutions to kilometers: s in kilometer = s (M revs.) lead P (mm) 10 6 Example: s in kilometers (revs.) 16 (mm) 10 6 = 800 km Notes The load ratio F m /C /C is the quotient of the average load F m divided by the dynamic load capacity C (See Design Calculations ). If other lubricants are used, this may lead to a reduction in the relubrication intervals, the achievable travel in short-stroke applications, and the load capacities. Possible chemical interactions between the plastic materials, lubricants and preservative oils must also be taken into account. Do not use greases containing solid particles (e.g. graphite or MoS 2 )! If there are environmental influences such as contamination, vibration or impact load etc., we recommend reducing relubrication intervals accordingly. Relubrication is required after 2 years at the latest, even under normal operating conditions, due to grease aging. If your application makes greater environmental demands (i.e. cleanroom, vacuum, foodstuff application, strong or aggressive metalworking fluids, or extreme temperatures) please contact us, since a special test and possibly a lubricant selection will be required. Please have all information about your application to hand. If you use a progressive plunger system, please note that the minimum dosing amount is 0.03 cm 3. In short stroke applications (stroke nut length L), it is often advisable to carry out a lubrication stroke as shown in the diagram. Please note the reduced load ratings according to the technical notes Technical Notes on page 141. Please consult our regional centers regarding short stroke applications. You can find your local contact person at: R ( ), Bosch Rexroth AG

160 160 Screw Assemblies Ball Screw Assemblies BASA Lubrication Grease lubrication with grease guns or progressive plunger systems for ball screw assemblies > Ø 12 mm Lubricant quantities - relubrication Size Relubrication lubricant quantity (cm 3 ) d 0 x P x D w - i FED-E-B / FEM-E-B / FEM-E-C / FEM-E-S / FEP-E-S / FEM-E-D ZEV-E-S FSZ-E-S / FSZ-E-B FDM-E-C / FDM-E-S / FDM-E-D SEM-E-C / SEM-E-S / FAR-B-S / ZEM-E-S / ZEM-E-K / ZEM-E-A 16x5Rx x5R/Lx x10Rx x16Rx x16Rx x5R/Lx x5Rx x10Rx x20Rx x20Rx x20Rx x40Rx x5R/Lx x5Rx x10Rx x10Rx x25Rx x25Rx x25Rx x25Rx x5Lx x5Rx x5Rx x10Rx x20Rx x20Rx x20Rx x32Rx x32Rx x32Rx x32Rx x64Rx x5Lx x5Rx x10Lx x10Rx x10Rx x12Rx x16Rx x20Rx x20Rx x40Rx x40Rx x40Rx Bosch Rexroth AG, R ( )

161 Ball Screw Assemblies BASA Screw Assemblies Lubrication 161 Size Relubrication lubricant quantity (cm 3 ) d 0 x P x D w - i FED-E-B / FEM-E-B / FEM-E-C / FEM-E-S / FEP-E-S / FEM-E-D ZEV-E-S FSZ-E-S / FSZ-E-B FDM-E-C / FDM-E-S / FDM-E-D SEM-E-C / SEM-E-S / FAR-B-S / ZEM-E-S / ZEM-E-K / ZEM-E-A 50x5Rx x10Rx x10Rx x12Rx x16Rx x20Rx x20Rx x20Rx x25Rx x40Rx x40Rx x40Rx x10Rx x10Rx x20Rx x20Rx x20Rx x40Rx x40Rx x40Rx x10Rx x20Rx Ball Screw Assemblies BASA Note: The sizes listed in the table are not available for all nut types. The respective size ranges can be found in the Nuts section from page 24 onwards. R ( ), Bosch Rexroth AG

162 162 Screw Assemblies Ball Screw Assemblies BASA Lubrication Liquid lubricant greasing with single-line distributor system via a piston distributor, and liquid lubricant greasing for ball screws Ø 12 mm Grease We recommend using Dynalub 520, which has the following properties: NLGI grade 00 lithium-based highperformance grease as per DIN (GP00K-20 according to DIN 51826) Good water resistance Corrosion protection Temperature range: 20 to +80 C Initial lubrication of the ball screws (basic lubrication) Completely assembled ball screws with a diameter of Ø 12 mm are prelubricated with Dynalub 520 as standard before shipment. Under conventional environmental conditions this ground-fiber, homogeneous grease is ideally suitable for the lubrication of linear elements: In single-line distributor system For loads of up to 50% C For short-stroke applications > 1 mm For the permissible speed range for ball screw assemblies For miniature versions In the case of the supplying of individual parts (nut on mounting arbor) or in versions without prelubrication before delivery, twice the initial lubrication quantity according to Table Lubricant quantities - relubrication on page 164 must be applied to the nut via the lube hole. The positioning and procedural instructions shown in the diagram below must be followed. The product and material safety data sheets are available on our website at Please also read the notes on page 165! Part numbers for Dynalub 520: R (400 g cartridge) R (5 kg bucket) R (5 ml maintenance kit) When using single-line distributor systems, care should always be taken that all lines and the piston distributors (including the connection to the BASA nut unit) are filled before performing basic lubrication or relubrication. For ball screws Ø 12 mm the use of the maintenance kit is recommended. Positioning and procedural instructions horizontal mounting position vertical mounting position Position of the nut during lubricating procedure 2 Flange with lube port (in the case of horizontal mounting the connection should as high up as possible) 3 Direction of travel after lubrication. Travel range at least 3x nut length. Relubrication of the ball screw assembly Apply the relubrication quantity stated in Table Lubricant quantities - relubrication on page 164 to the lube port when the specified relubrication interval shown in the diagram on page 163 has been reached. The pulse count can be calculated as the quotient (rounded to the next whole figure) of the relubrication quantity stated in Table Lubricant quantities - relubrication on page 164 and the piston distributor size. The minimum permissible piston distributor size is 0.03 cm 3. The lubricant cycle time can then be obtained by dividing the relubrication interval by the calculated pulse count. The nut position and travel range must be as shown in the diagram Positioning and procedural instructions. Bosch Rexroth AG, R ( )

163 Ball Screw Assemblies BASA Screw Assemblies Lubrication 163 Load-dependent relubrication intervals when using a single-line distributor system via a piston distributor and for liquid grease lubrication of ball screws Ø 12 mm ( dry axes ) The following conditions apply: Grease lubricant Dynalub 520 or alternatively Castrol Longtime PD 00, Elkalub GLS 135/N00 No exposure to process media Standard seals Driven screw No hypercritical operation Ambient temperature: T = 20 to 30 C s = relubrication interval (M revolutions) (10 6 revs.) C = dynamic load rating (N) F m = average load (N) d 0 = nominal diameter (mm) s 100,0 d 0 Ø 40 mm 37,5 d 0 > Ø 40 mm 7,5 F m /C 1,0 0 0,1 0,2 0,3 0,4 Ball Screw Assemblies BASA Conversion of the relubrication interval s from M revolutions to kilometers: s in kilometer = s (M revs.) lead P (mm) 10 6 Example: s in kilometers (revs.) 16 (mm) = 800 km Notes The load ratio F m /C /C is the quotient of the average load F m divided by the dynamic load capacity C (See Design Calculations ). If other lubricants are used, this may lead to a reduction in the relubrication intervals, the achievable travel in short-stroke applications, and the load capacities. Possible chemical interactions between the plastic materials, lubricants and preservative oils must also be taken into account. Do not use greases containing solid particles (e.g. graphite or MoS 2 )! If there are environmental influences such as contamination, vibration or impact load etc., we recommend reducing relubrication intervals accordingly. Relubrication is required after 2 years at the latest, even under normal operating conditions, due to grease aging. If your application makes greater environmental demands (i.e. cleanroom, vacuum, foodstuff application, strong or aggressive metalworking fluids, or extreme temperatures) please contact us, since a special test and possibly a lubricant selection will be required. Please have all information about your application to hand. If you use a single-line distributor system, please note that the minimum permissible piston distributor size is 0.03 cm 3. We recommend using piston distributors manufactured by SKF. These should be installed as close as possible to the lube port of the ball screw nut unit. Long lines and small line diameters should be avoided, and the lines should be laid so that they slant upwards. If there are other joint users of the single-line distributor system, the weakest link in this chain determines the lubrication rate. Pump tanks or supply tanks for the lubricant should be equipped either with an agitator or a follower piston in order to ensure that the lubricant continues to flow (prevention of piping defect in the tank) In short stroke applications (stroke nut length L), it is often advisable to carry out a lubrication stroke. One of the risks associated with this is that the low-viscosity lubricants will fail. Please read and follow the note on reduced load ratings in Technical Notes on page 141. Please consult our regional centers regarding short stroke applications. You can find your local contact person at: R ( ), Bosch Rexroth AG

164 164 Screw Assemblies Ball Screw Assemblies BASA Lubrication Lubricant quantities - relubrication Size Relubrication lubricant quantities (cm 3 ) d 0 x P x D w - i FED-E-B / FEM-E-B / FEM-E-C / FEM-E-S / FEP-E-S / FEM-E-D ZEV-E-S FSZ-E-S / FSZ-E-B FDM-E-C / FDM-E-S / FDM-E-D SEM-E-C / SEM-E-S / FAR-B-S / ZEM-E-S / ZEM-E-K / ZEM-E-A 6x1Rx x2Rx x1Rx x2Rx x2.5Rx x2Rx x5Rx x10Rx x5Rx x5R/Lx x10Rx x16Rx x16Rx x5R/Lx x5Rx x10Rx x20Rx x20Rx x20Rx x40Rx x5R/Lx x5Rx x10Rx x10Rx x25Rx x25Rx x25Rx x25Rx x5Lx x5Rx x5Rx x10Rx x20Rx x20Rx x20Rx x32Rx x32Rx x32Rx x32Rx x64Rx x5Lx x5Rx x10Lx x10Rx x10Rx x12Rx x16Rx x20Rx x20Rx x40Rx x40Rx x40Rx Bosch Rexroth AG, R ( )

165 Ball Screw Assemblies BASA Screw Assemblies Lubrication 165 Size Relubrication lubricant quantities (cm 3 ) d 0 x P x D w - i FED-E-B / FEM-E-B / FEM-E-C / FEM-E-S / FEP-E-S / FEM-E-D ZEV-E-S FSZ-E-S / FSZ-E-B FDM-E-C / FDM-E-S / FDM-E-D SEM-E-C / SEM-E-S / FAR-B-S / ZEM-E-S / ZEM-E-K / ZEM-E-A 50x5Rx x10Rx x10Rx x12Rx x16Rx x20Rx x20Rx x20Rx x25Rx x40Rx x40Rx x40Rx x10Rx x10Rx x20Rx x20Rx x20Rx x40Rx x40Rx x40Rx x10Rx x20Rx Ball Screw Assemblies BASA Note: The sizes listed in the table are not available for all nut types. The respective size ranges can be found in the Nuts section from page 24 onwards. R ( ), Bosch Rexroth AG

166 166 Screw Assemblies Ball Screw Assemblies BASA Lubrication Oil lubrication with a single-line distributor system via a piston distributor Lubricant oil We recommend using Shell Tonna S 220 which has the following properties: Special demulsifying oil CLP or CGLP as per DIN for machine bed tracks and tool guides A blend of highly refined mineral oils and additives Can be used even when mixed with significant quantities of metalworking fluids Initial lubrication of the ball screws (basic lubrication) Completely assembled ball screws with a diameter of Ø 12 mm are prelubricated with Dynalub 520 as standard before shipment. Completely assembled ball screws with a diameter greater than Ø 12 mm are prelubricated with Dynalub 510 as standard before shipment. In the case of the supplying of individual parts (nut on mounting arbor) or in special versions without prelubrication before delivery, the initial lubrication quantity according to Table Lubricant quantities - oil lubrication on page 168 must be applied to the nut via the lube hole. The positioning and procedural instructions shown in the diagram below must be followed. When using single-line distributor systems, care should always be taken that all lines and the piston distributors (including the connection to the BASA nut unit) are filled before performing basic lubrication or relubrication. Positioning and procedural instructions horizontal mounting position 1 2 vertical mounting position Position of the nut during lubricating procedure 2 Flange with lube port (in the case of horizontal mounting the connection should as high up as possible) 3 Direction of travel after lubrication. Travel range at least 3x nut length. Relubrication of the ball screw assembly Apply the relubrication quantity stated in Table Lubricant quantities - oil lubrication on page 168 to the lube port when the specified relubrication interval shown in the diagram on page 167 has been reached. The pulse count can be calculated as the quotient (rounded to the next whole figure) of the relubrication quantity stated in Table Lubricant quantities - oil lubrication on page 168 and the piston distributor size. The minimum permissible piston distributor size is 0.03 cm 3. The lubricant cycle time can then be obtained by dividing the relubrication interval by the calculated pulse count. The nut position and travel range must be as shown in the diagram Positioning and procedural instructions. Bosch Rexroth AG, R ( )

167 Ball Screw Assemblies BASA Screw Assemblies Lubrication 167 Lubricant quantities - oil lubrication Note: For oil lubrication of 2-start FED-E-B single nuts with flange the values shown in the table do not apply! Please consult us for advice! Load-dependent relubrication intervals for oil lubrication using a singleline distributor system via a piston distributor ( dry axes ) The following conditions apply: Lubricant oil Shell Tonna S 220 No exposure to process media Standard seals Driven screw No hypercritical operation Ambient temperature: T = 20 to 30 C s = relubrication interval (M revolutions) (10 6 revs.) or hours (h) C = dynamic load rating (N) F m = average load (N) Notes The load ratio F m /C is the quotient of the average load F m divided by the dynamic load capacity C (See Design Calculations ). The relubrication interval s is governed either by the number of rotations (M) or the operating time in h. The value first reached defines the lubricating interval. Nominal diameter Initial lubrication d 0 (mm) V e (cm 3 ) s (M revolutions) s (h) 1,5 11,5 1,4 Ø 6,Ø 8, Ø 12, Ø 16 10,8 1,3 10,0 1,2 9,2 1,1 8,5 1,0 7,7 0,9 6,9 0,8 6,2 0,7 5,4 0,6 4,6 0,5 3,8 0,4 3,1 0,3 2,3 0,2 1,5 0,1 0,8 0,0 0 0,1 0,2 0,3 0,4 0,0 1,5 1,4 1,3 1,2 1,1 1,0 0,9 0,8 0,7 0,6 0,5 0,4 0,3 0,2 0,1 0 s (M revolutions) Ø 20, Ø 25, Ø 32, Ø 40, Ø 50, Ø 63, Ø 80 Nominal diameter Relubrication d 0 (mm) V n (cm 3 ) ,1 0,2 0,3 0,4 0 s (h) F m /C F m /C Ball Screw Assemblies BASA Conversion of the relubrication interval s from M revolutions to kilometers: s in kilometer = s (M revs.) lead P (mm) 10 6 Example: s in kilometers (revs.) 16 (mm) 10 6 = 800 km R ( ), Bosch Rexroth AG

168 168 Screw Assemblies Ball Screw Assemblies BASA Lubrication Oil lubrication with a single-line distributor system via a piston distributor Notes If other lubricants are used, this may lead to a reduction in the relubrication intervals, the achievable travel in short-stroke applications, and the load capacities. Possible chemical interactions between the plastic materials, lubricants and preservative oils must also be taken into account. Do not use greases containing solid particles (e.g. graphite or MoS 2 )! If there are environmental influences such as contamination, vibration or impact load etc., we recommend reducing relubrication intervals accordingly. If your application makes greater environmental demands (i.e. cleanroom, vacuum, foodstuff application, strong or aggressive metalworking fluids, or extreme temperatures) please contact us, since a special test and possibly a lubricant selection will be required. Please have all information about your application to hand. If you use a single-line distributor system, please note that the minimum permissible piston distributor size is 0.03 cm 3. We recommend using piston distributors manufactured by SKF. These should be installed as close as possible to the lube port of the ball screw nut unit. Long lines and small line diameters should be avoided, and the lines should be laid so that they slant upwards. If there are other users of the single-line distributor network, the weakest link in this chain determines the lubrication rate. In short stroke applications (stroke nut length L), it is advisable to carry out a lubrication stroke more frequently. One of the risks associated with this is that the low-viscosity lubricants will fail. Please read and follow the note on reduced load ratings in Technical Notes on page 141. Please consult our regional centers regarding short stroke applications. You can find your local contact person at: Lubricant quantities - oil lubrication Note: For oil lubrication of 2-start FED-E-B flanged single nuts, the values shown in the table do not apply! Please consult us for advice! Nominal diameter Initial lubrication d 0 (mm) V e (cm 3 ) Nominal diameter Relubrication d 0 (mm) V n (cm 3 ) Bosch Rexroth AG, R ( )

169 Ball Screw Assemblies BASA Screw Assemblies Lubrication 169 Example of dimensioning for lubrication of a typical 2-axis application with one-point lubrication X axis Component or characteristic value Specification details Ball screw assembly FEM-E-S 32x10Rx ; C = 31,700 N; part no.: R (page 38) Average load F m = 9510 N Stroke 1000 mm Average torque n m = 1000 min 1 Ambient temperature 20 to 30 C Mounting orientation Horizontal Lubrication Single-line distributor system for all axes with Shell Tonna S 220 oil Exposure No exposure to process media, shavings, dust Design sizes Design Information sources 1. Normal stroke or short hub Normal stroke: Stroke > nut length L Note re. short stroke, page 141 L see page mm > 77 mm! i.e. normal stroke applies 2. Initial lubrication quantity Initial lubrication quantity: see basic lubrication page 160 with Dynalub 510 before shipment 3. Relubrication quantity Relubrication quantity: 0.06 cm 3 Relubrication quantity stated in table on page Mounting orientation Follow positioning and procedural instructions! see Positioning and procedural instructions on page 158 Ball Screw Assemblies BASA 5. Piston distributor size permissible piston distributor size: 0.03 cm 3 see page Pulse count 0.06 cm 3 Pulse count = 0.03 cm 3 = 2 Pulse count = 7. Load ratio 9510 N Load ratio = N = 0.3 Relubrication quantity Perm. piston distributor size Load ratio = F m C F m and C in spec. details 8. Relubrication interval Relubrication interval: revs. or every 4 h shown in diagram on page 159 for load ratio effective relubrication interval since if n m = 1000 min revs. is only reached after 6.66 h, the 4 h reading is taken as the lubricating interval. 10. Lubricant cycle time 4 h Lubricant cycle time = = 2 h 2 F m as per spec. details effective relubrication interval, see Note on page 165 eff. Relubrication interval Lubricant cycle time = Pulse count Interim result (X axis) In the case of the X axis, at least 0.03 cm 3 of Shell Tonna S 220 must be applied to the ball screw nut unit every 2 h. R ( ), Bosch Rexroth AG

170 170 Screw Assemblies Ball Screw Assemblies BASA Lubrication Lubrication Y axis Component or characteristic value Specification details Ball screw assembly FEM-E-C 16x16Rx3-3; C = 9300 N; part no.: R (page 40) Average load F m = 1200 N Stroke 500 mm Average torque n m = 1500 min 1 Ambient temperature 20 to 30 C Mounting orientation Horizontal Lubrication Single-line distributor system for all axes with Shell Tonna S 220 oil Exposure No exposure to process media, shavings, dust Design sizes Design Information sources 1. Normal stroke or short hub? Normal stroke: Stroke > nut length L 500 mm > 61 mm! i.e. normal stroke applies! Note re. short stroke on page 141, L see page Initial lubrication quantity Initial lubrication quantity: see basic lubrication on page 164 with Dynalub 510 before shipment 3. Relubrication quantity Relubrication quantity: 0.03 cm 3 Relubrication quantity shown in table on page Mounting orientation Follow positioning and procedural instructions! see Positioning and procedural instructions on page Piston distributor size permissible piston distributor size: 0.03 cm 3 see page Pulse count 0.03 cm 3 Pulse count = = cm 3 Pulse count = Relubrication quantity Perm. piston distributor size 7. Load ratio 1200 N Load ratio = = 0.13 Load ratio = F m 9300 N C F m and C in spec. details 8. Relubrication interval Relubrication interval: revs. or every 10 h shown in diagram on page 167 for load ratio effective relubrication interval since if n m = 1500 min revs. is only reached after 14.4 h, the 10 h reading is taken as the lubricating interval. 10. Lubricant cycle time 10 h Lubricant cycle time = = 10 h 1 n m as per spec. details effective relubrication interval, see Note on page 165 Lubricant cycle time = eff. relubrication interval Pulse count Interim result (Y axis) Final result (two-axis lubrication) In the case of the Y axis, at least 0.03 cm 3 of Shell Tonna S 220 must be applied to the ball screw nut unit every 10 h. Since in this example both axes are to be supplied by a single-line distributor system, the shorter lubricant cycle time of the X axis (2 h) means that the overall unit, i.e. including the Y axis, is lubricated every 2 h. Bosch Rexroth AG, R ( )

171 Ball Screw Assemblies BASA Screw Assemblies Lubrication 171 Relubrication for Driven Nut FAR For NLGI grade 2 greases (using grease gun) The driven nut can be supplied with grease via the outer race of the angular-contact thrust ball bearing. It must simply be noted that the nut must be stationary during the lubricating procedure. The nut can however be in any position on the screw. This provides a very simple solution to the problem of a rotating lube port on the nut unit itself. Two lube ports (M6) with radial or axial access are provided. On delivery, both are sealed by setscrews. The lube port can be opened by removing the set screw. For FAR with or without timing belt side drive the following applies: Can be relubricated with NLGI Class 2 grease when stationary via the stationary lube port of the bearing outer race optional screw liquid-cooled; on request Lubrication via screw FAR size BASA size d 0 x P x D w - i Relubrication quantity (cm 3 ) x 10R x x 20R x x 32R x x 10R x x 20R x x 40R x x 10R x x 20R x x 40R x x 10R x x 20R x x 40R x Ball Screw Assemblies BASA R ( ), Bosch Rexroth AG

172 172 Screw Assemblies Ball Screw Assemblies BASA Lubrication Lubricants Dynalub high-performance grease specially developed for linear motion systems (only licensed for EU countries, not approved outside of the European Union) Product description Dynalub 510 Part number Packing unit R x 400 g R Hobbock 25 kg Dynalub 510 is a NLGI grade 2 lithium-based high-performance grease that is specially developed for linear motion systems. It is notable for offering excellent water resistance and protection against corrosion, and it can be used at temperatures of between 20 C and +80 C. Applications Under conventional environmental conditions this ground-fiber, homogeneous grease is ideally suitable for the lubrication of linear elements: For loads of up to 0.5 C dyn Also for short-stroke applications 1 (mm) Technical Data Chemical composition Mineral oil, special lithium soap, active agents Designation KP2K-20 DIN For further details, please refer to Appearance light-brown/beige, ground-fiber material safety data sheet for Dynalub 510 Service temperature range -20 C to +80 C R310DE 2052 ( ) NLGI grade 2 Worked penetration /10 mm DIN ISO 2137 Water resistance 0-60, 1-90 DIN T1 Melting point in C > 165 DIN ISO 2176 Flash point in C > 200 base oil DIN ISO 2592 Base oil viscosity 100 mm 2 /s 40 C DIN mm 2 /s 100 C Flow pressure at 20 C < 1400 hpa DIN EMCOR test 0/0 DIN Density at +25 C approx g/cm 3 DIN Copper corrosion 2 (24 h/120 C) DIN Four ball tester welding load > 2000 N DIN T4 Four ball tester impression diameter 0.93 (400 N, 1 h) DIN T5 Shelf life in original container 2 years Product description Dynalub 520 Part number Packing unit R x 400 g R kg bucket R ml maintenance kit Dynalub 520 is an NLGI grade 00 lithiumbased high-performance grease specially developed for linear motion systems. It is notable for offering excellent water resistance and protection against corrosion, and it can be used at temperatures of between 20 C and +80 C. Applications Under conventional environmental conditions this ground-fiber, homogeneous grease is ideally suited for the lubrication of miniature linear elements and for use in centralized lubrication systems. Technical Data Chemical composition Mineral oil, special lithium soap, active agents Designation KP00K-20 DIN For further details, see Safety Data Sheet Appearance light-brown/beige, ground-fiber Dynalub 520 Service temperature range -20 C to +80 C R310EN 2053 ( ) NLGI grade 00 Worked penetration /10 mm DIN ISO 2137 Water resistance 1-90 DIN T1 Melting point in C > 160 DIN ISO 2176 Flash point in C > 200 base oil DIN ISO 2592 Base oil viscosity 100 mm 2 /s 40 C DIN mm 2 /s 100 C Flow pressure at 20 C < 700 hpa DIN EMCOR test 0 DIN Density at +25 C approx g/cm 3 DIN Copper corrosion 0-1 (24 h/100 C) DIN Four ball tester welding load 1800 N DIN T4 Four ball tester impression diameter 0.80 (400 N, 1 h) DIN T5 Shelf life in original container 2 years Bosch Rexroth AG, R ( )

173 Ball Screw Assemblies BASA Screw Assemblies Lubrication 173 Ball Screw Assemblies BASA R ( ), Bosch Rexroth AG

174 174 Screw Assemblies Ball Screw Assemblies BASA Design calculation and examples Design calculations Upon request, we can perform all the calculations according to your specifications. Average speed and average load See Design Calculation Service Form on page 193 Where the operating conditions vary (fluctuating speed and load), the service life must be calculated using the average values F m and n m. Where the speed fluctuates, the average speed n m is calculated as follows: n m = n 1 q t1 + n 2 q t n n q tn 100% 1 n 1, n 2,... n n = speeds in phases 1... n (min 1 ) n m = average speed (min 1 ) q t1, q t2,... q tn = discrete time step in phases 1... n (%) The following applies for the effective equivalent bearing load: Preload 2% of C % of C % of C % of C % of C 0.10 Preload factor X pr F 2.8 X pr C F eff n = F n F 2.8 X pr C 3 2 F n F eff n = + 1 X 2.8 X pr C pr C C = dynamic load rating (N) F eff n = effective equivalent axial load during phase n (N) F n = axial load during phase n (N) X pr = preload factor ( ) When the load and rotary speed vary, the average load F m is calculated as follows: q t1 q t2 3 q tn F m = F eff 1 + F eff F eff n 100% 100% 100% 2 F eff 1, F eff 2,... F eff n = Effective equivalent axial load during phases 1... n (N) F m = Equivalent dynamic axial load (N) q t1, q t2,... q tn = discrete time step for F eff 1,... F eff n (%) When the load and rotary speed vary, the average load F m is calculated as follows: 3 3 n 3 3 F m = F eff 1 1 q t1 n + F eff 2 2 q t2 n q F eff n n tn 3 n m 100% 100% n m 100% n m F eff 1, F eff 2,... F eff n = Effective equivalent axial load during phases 1... n (N) F m = Equivalent dynamic axial load (N) n 1, n 2,... n n = Speeds in phases 1... n (min 1 ) n m = Average speed (min 1 ) q t1, q t2,... q tn = Discrete time step for F eff 1,... F eff n (%) Nominal service life Service life in revolutions L 3 C L = L C 4 C = F m F m = F m 10 6) L 10 6) C = Dynamic load rating (N) F m = Equivalent dynamic axial load (N) L = Nominal service life in revolutions ( ) Bosch Rexroth AG, R ( )

175 Ball Screw Assemblies BASA Screw Assemblies Design calculation and examples 175 Service life in hours L h L h = L n m 60 7 L h = service life (h) L = service life in revolutions ( ) n m = average speed (min 1 ) Drive torque and drive power End machining must be checked in relation to the maximum permissible torque Drive torque M ta for conversion of rotary motion into linear motion L h machine = L h M ta = M ta M p F L P 2000 π η DC machine DC BASA 9 8 DC machine = duty cycle of the machine (%) DC BASA = duty cycle of the BASA (%) L h machine = Nominal service life of the machine (h) L h = Nominal service life of the ball screw assembly (h) F L = Thrust force (N) M p = Maximum permissible drive torque (Nm) M ta = Drive torque (Nm) P = Lead (mm) η = Mech. efficiency (η 0.9) ( ) Ball Screw Assemblies BASA Transmitted torque M te for conversion of linear motion into rotary motion: M te = F L P η 2000 π M te M p 10 F L = Thrust force (N) M p = Maximum permissible drive torque (Nm) M te = Transmitted torque (Nm) P = Lead (mm) η = Mech. efficiency (η 0.8) ( ) The dynamic drag torque must be taken into account for preloaded nuts units. Drive power P a P a = M ta n M ta = drive torque (Nm) n = speed (min 1 ) P a = drive power (kw) Static load safety factor S 0 The static load safety factor of every structural design with a rolling contact must be arithmetically verified. S 0 = C 0 / (F 0 max ) 12 C 0 = Static load rating (N) F 0 max = Maximum static load (N) S 0 = Static load safety factor ( ) In this calculation F 0 max represents the maximum occurring load amplitude which can be exerted on the screw assembly. It does not matter whether this load is exerted only for a short period. It may represent the peak amplitude of an overall dynamic loading. For design purposes, the data shown in the table applies. Design of the static load safety factor in relation to the operating conditions Operating conditions Static load safety factor S 0 Overhead arrangements and applications representing a high hazard potential 12 High dynamic load when at standstill, contamination Normal design of machinery and plant without full knowledge of the load parameters or connection details. 5-8 Full knowledge of all the load data. Vibration-free operation is ensured. 3-5 If there are health and safety hazards, protection against falling loads (see safety nut section) must be provided. R ( ), Bosch Rexroth AG

176 176 Screw Assemblies Ball Screw Assemblies BASA Design calculation and examples Design Calculations Example of service life calculation Operating conditions The service life of the machine should be 40,000 operating hours with the ball screw assembly operating 60% of the time. Proposed ball screw assembly: 63 x 10 F 1 = N at n 1 = 10 min 1 for q 1 = 6% of the duty cycle F 2 = N at n 2 = 30 min 1 for q 2 = 22% of the duty cycle F 3 = N at n 3 = 100 min 1 for q 3 = 47% of the duty cycle F 4 = N at n 4 = min 1 for q 4 = 25 % of the duty cycle 100 % Calculation procedure Average torque n m n m = n m = 304 min 1 1 Average load F m for variable load and variable speed F m = F m = 8757 N 3 Required service life L (revolutions) The service life L can be calculated by transposing the formulas 7 and 8 : L = L h n m 60 L h = L h machine DC BASA DC machine 60 L h = = h 100 L = L = revolutions Dynamic load rating C C = C N Result and selection Now a selection can be made from the dimension tables: e.g. ball screw, size 63 x 10R x 6-6, with preloaded flanged single nut FEM-E-S, dynamic load rating C = N, part number R Note: Take into account the dynamic load rating of the screw bearing used! Bosch Rexroth AG, R ( )

177 Ball Screw Assemblies BASA Screw Assemblies Design calculation and examples 177 Cross-check Now the following can be selected from the product tables: Size 63 x 10 R x 6-6 L Backlash FEM-E-S, with standard backlash Load capacity C dyn. = N Cross-check Service life of the selected ball screw in revolutions L revolutions Service life in hours L h FEM-E-S, with 5% preload Load capacity C dyn. = N Preload force = N Cross-check The following applies for the effective equivalent bearing load: F > 2.8 X pr C F eff n = F n F 2.8 X pr C Preload C = Dynamic load rating (N) F eff n = effective equivalent axial load during phase n (N) F n = axial load during phase n (N) X pr = preload factor ( ) 3 2 F n F eff n = + 1 X 2.8 X pr C pr C Ball Screw Assemblies BASA Lh L h hours 2.8 X pr x C = 2.8 x 0.05 x N = N - F 1 = N > N!F eff1 = N - F 2 = N > N!F eff2 = N - F 3 = 8000 N < N!F eff3 = - F 4 = 2000 N < N!F eff4 = , , N = N 1,5 0, N = N F m = F m = 9485 N L = revolutions L = hours The service life of both BASAs (with standard backlash / 5% preload) exceeds the required service life of 40,000 x 60% = 24,000 hours. The selection of a smaller BASA is consequently possible, subject to a review of it being undertaken. R ( ), Bosch Rexroth AG

178 178 Screw Assemblies Ball Screw Assemblies BASA Design calculation and examples Critical speed n cr The critical speed n cr depends on the diameter of the screw, the type of end fixity, and the free length l cr. No allowance must be Example Screw diameter = 63 mm Length l cr = 2.4 m End fixity II (fixed bearing - floating bearing) made for guidance by a nut with backlash. The operating speed should not reach more than 80% of the critical speed. According to the graph, the critical speed is min 1. The permissible operating speed is thus min 1 x 0.8 = min 1. The characteristic speed and the max. permissible linear speed must be taken into account, see Technical Notes on page 140. The maximum operating speed in our calculation example of n 4 = min 1 is therefore below the permissible operating speed Critical speed ncr (min 1 ) d 2 7 n 1 cr f ncr 2 10 (min ) l cr n crp = 0.8 n cr (min 1 ) ,2 0,3 0,4 0,5 0,6 0, End fixity: A = fixed bearing B = floating bearing C = without bearing A A A B B B C End fixity I II III IV f ncr - value A l cr l s Length l cr (m) n cr = Critical speed (min 1 ) n crp = Permissible operating speed (min 1 ) f ncr = Coefficient determined by bearing d 2 = Root diameter of screw ( see dimension tables) (mm) l cr = Critical length for preloaded nut systems (mm) l s = Bearing - bearing distance (mm) For non-preloaded nut systems l cr = l s For screw ends form 31 the end fixity can be assumed to be fixed. Bosch Rexroth AG, R ( )

179 Ball Screw Assemblies BASA Screw Assemblies Design calculation and examples 179 Permissible axial load on screw F c (buckling load) The permissible axial load on the screw F c depends on the diameter of the screw, the type of end fixity, and the effective free (unsupported) length l c. A safety factor of 2 should be taken into consideration when determining the permissible axial load. Example Screw diameter = 63 mm, Lead = 10 mm, Length l c = 2.4 m End fixity IV (fixed bearing - floating bearing) F c f Fc 10 (N) F c = Theoretically permissible axial load on screw (N) F cp = Permissible axial load on screw during operation (N) f Fc = Coefficient determined by bearing d 2 = Root diameter of screw, see dimension tables (mm) = unsupported thread length (mm) l c End fixity: F F F F F F A A l c A B l c A C l c B B l c A C A C l c F l c End fixity: F F F F F F cp A = fixed bearing B = floating bearing C = without bearing F c 2 d 2 4 l c 2 coefficient f Fc nut fixed End fixity I 40.6 (N) End fixity II / IV 20.4 End fixity III / VI 2.6 nut floating End fixity IV 20.4 End fixity V 10.2 End fixity VI 2.6 f Fc - value According to the graph, the theoretically permissible axial load is 360 kn. A permissible axial load on the screw of 360 kn : 2 = 180 kn is achieved when applying the safety factor 2. axial load on screw Fc (kn) End fixity 2.6 III / VI 10.2 V 20.4 II / IV 40.6 I ,0 0,9 0,8 0,7 0,6 0, ,1 0,2 0,3 This therefore lies above the maximum operating load of F 1 = 50 kn used in our calculation example. 0,4 0,5 0,6 0,8 1 0,1 0,2 0,3 0,4 0,5 0,6 0, ,2 0,3 0,4 0,5 0,6 0, ,2 0,3 0,4 0,5 0,6 0, Ball Screw Assemblies BASA Length l c (m) R ( ), Bosch Rexroth AG

180 180 Screw Assemblies Ball Screw Assemblies BASA Design calculation and examples Notes on buckling The effective buckling length l c of the screw is the maximum unsupported screw length in the direction of the force s flow between the nut unit and the fixed bearing (center-to-center distance) or between the nut unit and the screw end. For buckling load calculations the nut unit is taken into consideration as a bearing. For nut unit fixed, the following conditions must be met: zero-backlash nut unit, rigid attachment of the nut to the linear guide, the nut unit is not subjected to moment loads, i.e. a linear guide absorbs any arising moments, no distortive stresses due to external factors (e.g. temperature). In linear motion systems from Bosch Rexroth the nut unit can be considered to be a fixed bearing. If one or more of the conditions for nut unit fixed are not met, the appropriate coefficient for nut unit floating must be used instead. Case III occurs in applications with driven nuts, for example, when the nut is stationary and the screw rotates. The nut unit can then be considered as a fixed bearing. CaseVI arises only when the nut unit is not supported by any linear guide. Design of drive unit FAR-B-S Fundamental advantages of systems with driven nuts Moment of inertia In the case of long screws, the screw does not have to be rotated in the acceleration phase, only the nut. The mass moment of inertia of the screw is not therefore critical. The moment of inertia of the nut is comparatively low and it is no longer dependent on the required stroke. Dynamics The intricate end bearing designs that are needed for high dynamics, e.g. fixed bearing on both ends with angular-contact ball bearings are no longer necessary. Screw extenders Liquid cooling Since the screw is stationary, relatively effort is needed to extend the screw: Increase in permissible axial loading (buckling load); not limited by end bearings Compensation of temperature factors Increase in overall rigidity Improved cooling can easily be provided by using a hollow-bored screw: Cooling of the stationary screw can be provided with comparatively little effort. Controlled cooling virtually eliminates changes in length due to temperature fluctuations. Design and manufacturing tolerances The use of nuts with a high level of axial and radial runout precision minimizes the induced screw vibration. All functional components are supplied from a single source. Own designs are no longer needed Critical speed d 2 n 7 k f nk 2 10 (min 1) l n n kzul = 0.8. n k (min 1 ) n k = Critical speed (min 1 ) n kzul = permiss. operating speed (min 1 ) f nk = corrector value determined by bearing d 2 = root diameter, see dimension tables (mm) l n = critical length for preloaded nut systems (mm) Bosch Rexroth AG, R ( )

181 0,2 0,3 0,4 0,5 0,6 0,8 1 2 Ball Screw Assemblies BASA Screw Assemblies Design calculation and examples 181 Critical speed for driven screw: For the driven, rotating screw there is critical speed which depends on the various types of end fixity: I Fixed-Fixed, II Fixed-Loose, III Loose-Loose, II Fixed-Free. For systems with a driven screw, the critical speed in relation to bending often limits the speed that can be achieved. The rotating screw itself often generates system vibrations due to the deflection in horizontal installation, or due to screw imbalances. Depending on the free screw length and the speed, resonance and very large amplitudes may develop which destroy the system. The design used generally incorporates a 20% safety margin in excess of the critical speed. Critical speed nk in (mm 1 ) fixed floating floating free Recommended operating range with driven screw: Length l n in (mm) 5 6 n k fixed fixed floating fixed l1 ln Ball Screw Assemblies BASA End fixity f nk value I II III IV 27,4 18,9 12,1 4,3 Critical speed for driven nut: If systems with a driven nut and stationary screw are properly designed, any selfexcitation of the screw is eliminated. The only remaining possible causes of vibration are the levels of manufacturing accuracy of the rotating nut or of the machine's structural design Since in the case of the FAR-B-S drive units only nuts are used which have been manufactured with a high-precision axial and radial run-out, any negative influence on the overall system can be ruled out. The critical speed in relation to bending is therefore no longer a limiting factor. The maximum speed remains limited by the maximum speed of the bearings used and, more rarely, by the high maximum permissible speed (d 0 x n value) of the nut unit that is used. Critical speed nk in (mm 1 ) n max bearing 2700 rpm Usable operating range with driven nut 0,2 0,3 0,4 0,5 0,6 0, Note: Only applies to fixed-fixed bearings fixed fixed Length l n in (mm) End fixity f nk value I 27,4 R ( ), Bosch Rexroth AG

182 182 Screw Assemblies Ball Screw Assemblies BASA Design calculation and examples Design of drive unit FAR-B-S Permissible speed depending on the nut position Permissible speed with driven nut End fixity I Fixed-Fixed bearing End fixity II Fixed-Floating bearing Driven screw for comparison: Max. permissible speed depending on the nut position Size 50x40Rx6.5 with Fixed-Fixed bearing and driven screw Parameters: Screw length Screw diameter Lead End fixity Extension force, negligible Max. bearing speed d x n value of the nut v (m/min) The diagrams opposite illustrate the advantages of the driven nut compared to the classic ball screw with a driven screw using sizes 50 x 40R x 6.5 as examples. In the case of the driven screw (top diagram) the maximum permissible speed in the middle of the screw is approx. 60 m/min. However, this speed is only achieved in one stroke position. If the nut is positioned off-center, only approx. 20 m/min is reached owing to the lack of support for the screw. Therefore the potential for a high characteristic speed of the nut (d x n value) cannot be exploited in practice. Driven nut However, with a driven nut (bottom diagram; End fixity I Fixed-Fixed ) the permissible speed of the drive unit is 108 m/min, irrespective of the nut position over the stroke as a whole. In the case of End fixity II Fixed-Floating, the floating bearing (axial displacement possible) can be designed so that the bending curve runs tangentially (bend angle at bearing = 0). Such a floating bearing can likewise be regarded as a fixed bearing for the purposes of the calculation. v (m/min) Driven nut Nut position (mm) Max. permissible linear speed Size 50x40Rx6.5 with Fixed-Fixed bearing and driven nut Nut position (mm) Bosch Rexroth AG, R ( )

183 Ball Screw Assemblies BASA Screw Assemblies Design calculation and examples 183 The permissible rotational speeds and speeds of the FAR-B-S drive units are shown in the following table: End fixity I Fixed-Fixed bearing and End fixity II Fixed-Floating bearing Conversion of the rotational speed into travel speed FAR-B-S size d 0 x P x D w - i speed n Max (min 1 ) speed v maxfar (m/min) 32 x 10R x x 20R x x 32R x x 10R x x 20R x x 40R x x 10R x x 20R x x 40R x x 10R x x 20R x x 40R x vmax = nmax P 1000 v max = travel speed P = lead n max = rotational speed (m/min) (mm) (rpm) Ball Screw Assemblies BASA End fixity III Floating-Floating bearing This type of end fixity is hardly ever used. Critical speed for rotating nut and fixed screw: End fixity IV Fixed-Floating bearing In the case of Fixed-Floating systems with a driven nut, the screw in practice only be designed for short strokes. As an extreme example, the own weight of a 50 x 40 screw that is 5,000 mm long and horizontally mounted would lead to extreme static sag of approx. 180 mm. Even significantly smaller deflections and the resulting forces on the nut must be fully eliminated by the structural design. If this is achieved, then even in the case of the FAR-B-S the critical rotational speed in an unfavorable nut position at the fixing point can be regarded as the limit, (see diagram center-right). The value reading that is taken theoretically cannot exceed 28 m/min, but due to the deflection it cannot be used. In practice therefore a limit must be introduced on the length of the screw. Driven nut Max. permissible linear speed Size 50x40Rx6.5 with Fixed-Floating bearing v (m/min) not usable Nut position (mm) With the recommended maximum screw length of L Gew max in the diagram on the far right-hand side and a nut position of 700 mm, a speed of 108 m/min is achieved. Driven nut Max. permissible linear speed Size 50x40Rx6.5 with Fixed-Floating bearing v (m/min) Nut position (mm) BASA Recommended maximum length (mm) size L Gew max R ( ), Bosch Rexroth AG

184 184 Screw Assemblies Ball Screw Assemblies BASA Design calculation and examples Design of drive unit FAR-B-S Permissible torques depending on the nut position The permissible drive torque on the driven nut is limited by the following parameters Screw length Screw diameter End fixity Stretching force Geometry of the screw end Direction of loading; in unfavorable circumstances compressive force on the longer section of the screw (buckling load) Buckling load End fixity: F F F F A A l c A B l c A C l c B B l c F F F F coefficient f Fc nut fixed End fixity I 40.6 End fixity II / IV 20.4 nut floating End fixity IV 20.4 End fixity V 10.2 axial load on screw Fk (kn) F A C A C l c F End fixity III / VI F l c F End fixity VI ffc- value End fixity 1,0 0,9 0,8 0,7 0,6 0,5 2.6 III / VI 0,1 0,2 0,3 0,4 0,5 0,6 0, V 20.4 II / IV 40.6 I 0,2 0,1 0,3 0,4 0,5 0,6 0, ,2 0,3 0,4 0,5 0,6 0, ,2 0,3 0,4 0,5 0,6 0, Length l k (m) The screw length and diameter and fixity are taken into account in the Euler buckling formula. This provides the permissible axial screw load (see diagram above). In practice, the calculation uses the formulas that are shown opposite. With stretched screw: 4 d 2 2 l k F k = f Fk 10 4 (N) F kzul F K = 2 (N) F F kzul F K F kzul = 2 + F R F k = Theoretically permissible axial load on screw (N) F kzul = Permissible axial load on screw during operation (N) f Fk = Coefficient determined by bearing d 2 = Root diameter, see dimension tables (mm) l k = unsupported thread length (mm) F = Customer's operating load (N) F R = Stretching force of the screw (N) The temperature increase in operation can lead to a reduction in the stretching force. This influence must be taken into account when calculating F kzul. The drive torque required for the operating load is calculated by the following formula: M ta F P π η The dynamic drag torque must be taken into account for preloaded nut units. M ta = drive torque on the nut (Nm) F = operating load (N) P = lead (mm) η = mech. efficiency (approx. 0.9) M ta < M Spzul M Spzul = Permissible torque on the screw spigot (Nm) Recommended maximum torques with the geometry of screw end BASA size M Spzul (Nm) 32 < < < < 190 Bosch Rexroth AG, R ( )

185 Ball Screw Assemblies BASA Screw Assemblies Design calculation and examples 185 Typical applications End fixity I Fixed-Fixed: Parameters: Screw length; two scenarios Screw diameter End fixity Fixed-Fixed in this case Extension force, negligible (see following pages) Geometry of the screw end Form 51 on both sides Direction of loading; in unfavorable circumstances compressive force on the longer section of the screw Example: Depending on the nut position, a long screw axis, e.g. in the case of water jet cutting, makes high drive torque possible. Permiss. torque (Nm) Nut position (mm) L max Example: Irrespective of the nut position, a short screw in the case of machine tool axis makes a high drive torque possible. Permiss. torque (Nm) Nut position (mm) L max Ball Screw Assemblies BASA F F End fixity II Fixed-Floating: Stretching is not possible End fixity III Floating-Floating This type of end fixity is hardly ever used. End fixity IV Fixed-Floating Parameters: Screw length Screw diameter End fixity Fixed-Floating in this case Stretching force, none Geometry of the screw end Form 51 on both sides Compressive load in the direction of the fixed bearing Example: A short screw, e.g. in a press application, makes high torques possible. Permiss. torque (Nm) Nut position (mm) L ma F R ( ), Bosch Rexroth AG

186 186 Screw Assemblies Ball Screw Assemblies BASA Design calculation and examples Design of drive unit FAR-B-S Stretching of screws Principles In order to maximize the performance capabilities of a system with a driven nut, use of a fixity which is fixed is at both ends of the screw (Fixed-Fixed) is recommended. The stretching of the screw has the following positive effect on the system as a whole: Compensation of temperature influences for preventing compressive loads in the screw, and consequently a reduced risk of buckling. The change in length and tensile stress in the screw caused by the stretching must be kept within a range which is acceptable for the system as a whole, since otherwise impermissible lead deviations may occur between the nut and screw due to elastic deformation which have a negative influence on service life. Convection cooling of the screw allows a max. temperature difference of approx. 10 C to be produced through stretching. In the case of long, composite screws, temperature compensation of 5 C is advisable. In the case of larger temperature differences, water cooling of the screw is necessary. Fixed fixing point Fixing point with Belleville washer Longitudinal stretching Calculation of the longitudinal stretching of a screw in operation with an increase in temperature. L = L Gew α L ( Sp R ) where α L = L = longitudinal stretching (mm) L Gew = thread length (mm) α L = longitudinal stretching coefficient (1/K) Sp = screw temperature in operation (K) R = room temperature (K) Stretching force Calculation of the stretching force needed to compensate for the longitudinal stretching. F R = π L E d 2 4 N L Gew F R = stretching force (N) d N = approximate diameter (mm) E = modulus of elasticity (N/mm 2 ) d N = d 0 + d 2 2 d 0 = nominal diameter d 2 = screw core diameter (mm) (mm) Compressive stress The compressive stress in the screw which arises with fixed-fixed fixity as a result of the temperature difference is calculated as follows. σ D = E ( Sp R ) α L where E = N/mm 2 σ D = compressive stress due to temperature increase (N/mm 2 ) Bosch Rexroth AG, R ( )

187 Ball Screw Assemblies BASA Screw Assemblies Design calculation and examples 187 Tensile stress During operation, the tensile stress in the screw due to its extension must be greater than the temperature-induced compressive stress. At the same time, the permissible tensile stress must not be exceeded. Tensile stress in the screw caused by stretching σ Z = π 4 F R d N 2 σ Z = tensile stress (N/mm 2 ) Permissible change in length Stretching causes a change in the length of the screw and this in turn causes a change in the screw and raceway geometry. In order to avoid negative effects on the service life of the ball screw assembly, this must be checked. σ Z < σ zul L zul = L Gew P L L zul The maximum permissible tension σ zul = 70 N/mm 2 L zul = perm. longitudinal stretching (mm) P = lead (mm) L Gew = thread length (mm) Ball Screw Assemblies BASA R ( ), Bosch Rexroth AG

188 188 Screw Assemblies Ball Screw Assemblies BASA End Bearings Design Notes, Mounting Instructions Bearing design For customer-machined screw ends, please follow the design notes given for screw ends and housings. For Rexroth screw end designs, see End Machining Details. Rexroth delivers complete drive systems, including the end bearings. Calculations are performed with the formulas used in the antifriction bearing industry. Screw end 0,8 0,8 A d IT6 Housing IT4 IT5 C 1,6 C D J6 IT3 1,6 IT4 A Mounting Angular-contact thrust ball bearings and deep-groove ball bearings When mounting the angular-contact thrust ball bearings LGF and LGN, ensure that the mounting forces are exerted only on the bearing rings. Never apply mounting forces via the anti-friction bearing elements or the seal rings! The two sections of the inner raceway must not be separated during assembly or disassembly for any reason! Tighten the mounting screws for screw-down or flange-mounted bearings in crosswise sequence. The mounting screws may be subjected only to tension amounting to a maximum of 70% of their yielding point. The screw-down (LGF) bearings have a groove on the cylindrical surface of the outer raceway for disassembly. The individual bearings of the bearing pair series LGF-C... and LGN-C... are marked on the cylindrical surfaces of the outer raceways (see Figure). The markings reveal the bearing sequence. The sealing rings should face outwards after proper mounting. Outer raceway markings for paired bearings Slotted nut NMA, NMZ The bearings are preloaded by tightening the nuts. In order to prevent settling phenomena, we recommend first tightening the slotted nut by twice the value of the tightening torque M A and then easing the load. Only then should the slotted nut be retightened to the specified tightening torque M A. The two set screws are then alternately tightened using a hexagon socket wrench. The components are disassembled in the reverse order, i.e. the set screws should be removed before the slotted nut. The slotted nuts can be used several times when properly assembled and disassembled by competent personnel. The inner raceways of the bearings are dimensioned in such a way as to achieve a defined bearing preload sufficient for most applications when the slotted nut is tightened (M A in accordance with Dimension Table). Bosch Rexroth AG, R ( )

189 Ball Screw Assemblies BASA Screw Assemblies End Bearings 189 Mounting the housing Mounting the housing SEB Tighten the pillow block mounting screws in crosswise sequence. See table for max. tightening torque. The housing nut fixes the entire bearing unit in the housing. Use a threadlocking adhesive to secure the housing nut in place. cc Note: Take care to align the screw and nut assembly, the bearings and the guideway precisely with one another. The Rexroth gauge is a useful aid here. Size h O 1 O 2 O 3 tapered pin (hardened) d 0 xp (mm) DIN 912 DIN 912 O 4, deep-groove ball bearing (DIN 6325) 6x1/2 8 M5x20 M6x16 4x20 8x1/2/2.5 8 M5x20 M6x16 4x20 12x2/5/10 8 M5x20 M6x16 4x20 16x5/10/16 11 M8x35 M10x25 8x40 20x5/10/20/40 11 M8x35 M10x25 8x40 25x5/10/25 14 M10x40 M12x30 10x50 32x5/10/20/32/64 14 M10x40 M12x30 10x50 40x5/10/12/16/20/40 16 M12x50 M14x35 10x50 50x5/10/12/16/20/25/40 16 M12x55 M14x35 10x60 63x10/20/40 16 M12x65 M14x35 10x70 80x10/20 22 M16x70 M20x50 12x80 Mounting screw O 1 O2 Locating pins O3 O4 Ball Screw Assemblies BASA h Tightening torques for fastening screws according to VDI 2230 for m G = m K = (friction coefficient) Steel/steel material pairing Strength class for O 1 ; O 2 M5 M6 M8 M10 M12 M14 M (Nm) Steel/aluminum and aluminum/aluminum material pairings Strength class for O 1 ; O 2 M5 M6 M8 M10 M12 M14 M (Nm) Mounting screws c c Always make sure the screws are secure where there are high screw loads! R ( ), Bosch Rexroth AG

190 190 Screw Assemblies Ball Screw Assemblies BASA End Bearings Lubrication of the end bearings Bearings for ball screw assemblies are lubricated with grease for a lifetime of reliable service. It should be noted, however, that grease lubrication does not facilitate the dissipation of heat in the bearings. The bearing temperature in machine tools should not exceed 50 C. At higher temperatures circulating oil lubrication must be set up. LGF and LGN series angular-contact thrust ball bearings are lubricated for life with grease KE2P-35 as per DIN For regreasing, the quantities stated in the table below can be applied via the lube ports provided on the bearings. Where there are pairs of bearings, please note that each bearing must be individually lubricated via the lube port. Each bearing must be lubricated with half the value shown in the table. The maximum interval can be assumed to be 350 million revolutions, in which case the larger of the two quantities should be used.. As a rule, the initial grease quantity will therefore last for the entire service life of a ball screw assembly. Relubrication quantities for angular-contact thrust ball bearings Designation Quantity (cm 3 ) Designation Quantity (cm 3 ) Designation Quantity (cm 3 ) 1) 2) 1) 1) LGN-B LGN-B LGN-B-1242 LGF-B LGN-B-1747 LGF-B LGN-B-2052 LGF-B LGN-B-2557 LGF-B LGN-C-2557 LGF-C LGN-B-3062 LGF-B LGN-C-3062 LGF-C LGN-B-3572 LGF-B LGN-A LGN-A-4090 LGF-B LGN-A LGN-A LGF-A ) Shortened lubricating interval max. 10 M revolutions 2) Where there are pairs of bearings, lubricate each bearing via the lube port. Lubricate each bearing with half the value shown in the table. Bosch Rexroth AG, R ( )

191 Ball Screw Assemblies BASA Screw Assemblies End Bearings 191 Design calculations Resulting and equivalent bearing loads For angular-contact thrust ball bearings LGN and LFG Angular-contact thrust ball bearings are preloaded. The chart shows the resulting axial bearing load F ax as a function of preload and axial operating load F Lax. For a purely axial load F comb = F ax. α = 60 X Y F ax F rad F ax > 2.17 F rad α = pressure angle F ax = resulting bearing load F Lax = operating load X, Y = dimensionless factor If the radial operating forces are not insignificant, the equivalent bearing loads are calculated according to formula 20. Bearings for ball screw assemblies are also able to accommodate tilting moments. As a rule, the moments that usually occur due to the weight and drive motion of the screw do not need to be incorporated into the calculation of the equivalent bearing load. F comb = X F rad + Y F ax d = d 6 = Internal preload limit and resulting bearing load Resulting bearing load Fax (N) 1) Four-row version d = 17 d = 12 d = d = 35 d = 30 Limit values F ax = resulting axial bearing load (N) F comb = combined equivalent bearing load (N) F rad = radial bearing load (N) 1) d=25 d=30 1) d=40 d= Operating load F Lax (N) Ball Screw Assemblies BASA Permissible static axial load for bearing series LGF The permissible static axial load of LGF series bearings in screw-down direction is: F 0ax p C 0 2 The static axial load rating C 0 is stated in the Dimension Tables. F 0ax p = permissible static axial bearing load (N) R ( ), Bosch Rexroth AG

192 192 Screw Assemblies Ball Screw Assemblies BASA End Bearings Design calculations Resulting and equivalent bearing loads For angular-contact thrust ball bearings LGL Before determining the combined equivalent load F comb, the bearing size must be checked against the chart of static load limits. A bearing will only be suitable for a particular application when the intersection point between the axial and radial bearing loads lies below the load limit curve. F comb = X F rad A + Y F ax B + Z 21 Bearing size X Y Z A B LGL-D LGL-A LGL-A LGL-A Static load limit LGL-D-0624 LGL-A-1244 LGL-A-1547 LGL-A-2060 Radial load on bearing Frad (N) F ax = axial bearing load (N) F comb = combined equivalent bearing load (N) F rad = radial bearing load (N) X, Y, Z = calculation factors ( ) A, B = exponents ( ) Axial load on bearing F ax (N) Average speed and average bearing load When the bearing load varies in steps over a specific period of time, use formula 22 to calculate the dynamic equivalent bearing load. If the speed varies, use formula 23. In these formulas q t denotes the discrete time steps for the individual phases in %. F m 3 F comb1 3 n 1 F comb2 3 F combn 3 q t1 n 2 q t2 n n n m n m 100 n m q n 1 q m n + 2 q 1 n n nn F comb1... F combn = combined equivalent axial load in phases 1... n (N) F m = dynamic equivalent bearing load (N) n 1... n n = speeds in phases 1... n (min 1 ) n m = average speed (min 1 ) q t1... q tn = discrete time steps in phases 1... n (%) q tn 22 Service life and load safety factor Nominal service life The nominal life is calculated as follows: Note: take the dynamic load rating of the nut into account! C L 10 6 F comb L h n m 3 C F comb C = Dynamic bearing load rating (N) F comb = Combined equivalent bearing load (N) L = Nominal service life in revolutions ( ) L h = Nominal service life in operating hours (h) n m = Average speed (min 1 ) Static load safety factor The static load safety factor for machine tools should not be lower than 4. S 0 = C 0 F 0max 26 F 0max = Maximum static load (N) C 0 = Static load rating (N) S 0 = Static load safety factor ( ) Bosch Rexroth AG, R ( )

193 Ball Screw Assemblies BASA Screw Assemblies End Bearings 193 Design Calculation Service Form Please submit your inquiry to our regional centers. You can find your local contact person here: Application New design Revised design Operating conditions Loads (N) Speeds (1/min) Discrete time steps (%) F 1 = at n 1 = for q 1 = F 2 = at n 2 = for q 2 = F 3 = at n 3 = for q 3 = F 4 = at n 4 = for q 4 = F 5 = at n 5 = for q 5 = F 6 = at n 6 = for q 6 = average load (see page 170) average speed (see page 170) Sum of time steps F m = n m = Q = 100% Maximum static load: N Required service life Operating hours or x 10 6 ball screw revolutions Ball Screw Assemblies BASA Screw end fixity horizontal vertical Screw end fixity A B B C Selected: Installation conditions (enclose drawings/sketches if possible!) Drawing enclosed A A B A I II III IV (see page 178) Type of lubrication: Operating temperature: C - min/max. / C Exceptional operating conditions: Sender OEM User Distributor Company Address Name Department Telephone Fax R ( ), Bosch Rexroth AG

194 194 Screw Assemblies Ball Screw Assemblies BASA End Bearings Bosch Rexroth AG, R ( )

195 Planetary Screw Assemblies PLSA Screw Assemblies 195 Planetary Screw Assemblies PLSA Planetary Screw Assemblies PLSA Bosch Rexroth AG, R ( )

196 196 Screw Assemblies Planetary Screw Assemblies PLSA Contents Table of contents Planetary screw assemblies Contents 196 Product Overview 197 Nuts, Screws, Screw Ends, Bearings 197 Planetary Screw Assembly Definition 198 Application Examples 200 Inquiries and Orders 202 Overview of types 203 Screws 210 Precision Screw PSR 210 Screw Ends 212 Form Form Form Form Form Form Form Nuts 204 Cylindrical Single Nut ZEM-E-S 204 Flanged Single Nut FEM-E-S 206 Flanged Single Nut, split FDM-E-S 208 Accessories 226 Overview 226 Bearing unit LAF 228 Bearing unit LAN 230 Bearing unit LAD 232 Bearing unit LAS 234 Bearing unit FEC-F 236 Slotted Nuts NMA for Fixed Bearings 238 Technical Data 242 Technical Notes 242 Acceptance Conditions and Tolerance Grades 245 Preload, Rigidity, Friction Torques 248 Mounting 250 Installation Tolerances 252 Lubrication 253 Design Calculations 256 End Bearings 262 Lubrication of the end bearings 263 End Bearings 264 Design Calculation Service Form 266 Bosch Rexroth AG, R ( )

197 Planetary Screw Assemblies PLSA Screw Assemblies Product Overview 197 Nuts, Screws, Screw Ends, Bearings Nuts Cylindrical Single Nut Page 204 ZEM-E-S With backlash or preload Flanged Single Nut 206 FEM-E-S With backlash or preload Flanged Single Nut split 208 FDM-E-S With preload Screws Precision Screw PSR Tolerance grades T5, T7, T9 210 Acceptance conditions 245 Screw end machining 211 Bearing LAF 228 Diameter d 0 (mm) Lead P (mm) X 30 X X 39 X X 48 X X 60 X X 75 X X LAN 230 LAD 232 LAS 234 FEC-F 236 Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

198 198 Screw Assemblies Planetary Screw Assemblies PLSA Contents Planetary Screw Assembly Definition The Planetary Screw Assembly PLSA is an assembly comprising a screw with planets as the rolling elements. It serves to convert rotary motion into linear motion and vice versa. The function principle of a planetary screw assembly is easy to describe, but the range of designs and the requirements for practical applications are many and varied. Planetary Screw Assemblies are designed to transmit high forces and extend the Screw Assemblies product portfolio at the upper end. Planetary Screw Assemblies are screw drives in which threaded rollers (the planets) are housed in a screw nut, their ends being lodged in discs with holes arranged around a pitch circle so that they rotate parallel to the axis of a special screw, causing the nut to move linearly along the screw. Rexroth Planetary Screw Assemblies offer designers many opportunities to solve transport and positioning tasks in configurations with a driven screw. At Rexroth you will be sure to find exactly the kind of tailor-made products you need for special applications. Structural Design: Both the screw and the nut have an identical multi-start profile with a flank angle of 90. The planets have journals at both ends with are lodged in holes bored in the guide discs. The toothed ends of the planets engage with the internal gear rings of the nut. The planets have singlestart threads and crowned flanks that roll without slipping along the nut threads. At each end of the nut there is an internally geared ring which engages with the external gearing on the planets. Guide discs inside the gear rings support the planets journals and ensure that they are correctly spaced. The discs also prevent coarse dirt from working its way into the nut. Versions: Cylindrical Single Nut with backlash or preload (ZEM-E-S) Flanged Single Nut with backlash or preload (FEM-E-S) Flanged Single Nut, split, with preload (FDM-E-S) Precision Screws PSR Bosch Rexroth has a long tradition of manufacturing precision screws. Offered in many sizes and in unmatched quality, these have for years been essential components in our Ball Screw Assemblies product range. We have transferred this tried and trusted manufacturing technology to the screws of our Planetary Screw Assemblies. For users, this results in many advantages, including the following: Identical quality to Rexroth Ball Screw Assemblies Fast delivery Attractive prices thanks to cost-effective manufacturing Bosch Rexroth AG, R ( )

199 Planetary Screw Assemblies PLSA Screw Assemblies Contents 199 Advantages Smooth functioning due to the synchronized movement of the planets Very low noise High linear travel speeds Large number of contact points High load ratings High mechanical efficiency Long life Compact design High power density Effective, wiping sealing Low lubricant consumption Preloaded units available High positioning accuracy and repeatability Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

200 200 Screw Assemblies Planetary Screw Assemblies PLSA Application Examples Application Examples Rexroth Planetary Screw Assemblies are used with great success in many different application areas: Plastic injection molding machines Machine tools Measuring and material testing machines Robots Automotive industry Aerospace industry Automation and handling Food and packaging industries Printing and paper industry Medical technology Cutting operations Forming operations Metals industry Electric press Bosch Rexroth AG, R ( )

201 Planetary Screw Assemblies PLSA Screw Assemblies Application Examples 201 Friction welding machine Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

202 202 Screw Assemblies Planetary Screw Assemblies PLSA Inquiries and Orders Identification system for short product names PLSA / ordering codes Planetary Screw Assembly PLSA 20 x5 R FEM-E-S T7 R 812 A Z A Z Planetary Screw Assembly Size Nominal diameter (mm) Lead (mm) Direction of lead, R right Nut type ZEM-E-S Cylindrical Single Nut FEM-E-S Flanged Single Nut FDM-E-S Flanged Single Nut, split Nut rework 00 no rework Seal 0 without 1 lip-type seal 4 gap-type seal (standard) Preload 0 backlash 1 preload Precision T5, T7, T9 Screw R... Precision screw Left screw end Form: standard form A with wrench flat on the thread B with wrench flat on the collar Option: Z centering as per DIN 332-D S hex socket G female thread K none Version: Right screw end... see left screw end Overall length [mm] Documentation 1 standard (acceptance test report) 2 torque test report 3 lead test report 6 lead and torque test report Lubrication 1 preserved and nut with basic greasing 2 preserved Mounting direction of nut types Definition: The centering diameter on a nut with flange points to the right end of the screw. For cylindrical nuts, the mounting direction can be chosen at will (symmetrical). Centering diameter D 1 Symmetrical keyway Bosch Rexroth AG, R ( )

203 Planetary Screw Assemblies PLSA Screw Assemblies Overview of types 203 Overview of types ZEM-E-S FEM-E-S FDM-E-S Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

204 204 Screw Assemblies Planetary Screw Assemblies PLSA Nuts Cylindrical Single Nut ZEM-E-S With standard seals With backlash max mm or preload For precision screws PSR in tolerance grade T5, T7, T9 (with backlash only) Note: Delivered only as a complete unit. Ordering code PLSA: PLSA 20 x 5R ZEM-E-S T7 R 822Z Z C = dynamic load rating C 0 = static load rating d 0 x P = size d 0 = nominal diameter no. = part number P = lead (R = right-hand) S = lube port = maximum linear speed v max d 0 x P no. C 1) v 2) max (kn) (kn) (m/min) 20 x 5R R157C A x 5R R157C x 10R R157C x 5R R157C x 10R R157C x 5R R157C x 10R R157C x 10R R157C x 20R R157C x 10R R157C x 20R R157C ) The load ratings are valid for tolerance grade T5 only. For other tolerance grades, please consider the correction factor f ac on page ) See Characteristic speed on page 243 and Critical speed n cr on page 260 C 0 1) Bosch Rexroth AG, R ( )

205 Planetary Screw Assemblies PLSA Screw Assemblies Nuts 205 L L 5 T 1 D 1 D -0,05 1-0,10 S B L 12 L 11 L 6 d 0 x P (mm) Weight B P9 D 1 g6 L L 5 L 6 L L 12 T S m (kg) 20 x 5R x 5R x 10R x 5R x 10R x 5R x 10R x 10R x 20R x 10R x 20R Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

206 206 Screw Assemblies Planetary Screw Assemblies PLSA Nuts Flanged Single Nut FEM-E-S With standard seals With backlash max mm or preload For precision screws PSR in tolerance grade T5, T7, T9 (with backlash only) Note: Delivered only as a complete unit. Ordering code PLSA: PLSA 20 x 5R FEM-E-S T5 R 812Z Z C = dynamic load rating C 0 = static load rating d 0 x P = size d 0 = nominal diameter no. = part number P = lead (R = right-hand) S = lube port = maximum linear speed v max d 0 x P no. C 1) v 2) max (kn) (kn) (m/min) 20 x 5R R157C A x 5R R157C x 10R R157C x 5R R157C x 10R R157C x 5R R157C x 10R R157C x 10R R157C x 20R R157C x 10R R157C x 20R R157C ) The load ratings are valid for tolerance grade T5 only. For other tolerance grades, please consider the correction factor f ac on page ) See Characteristic speed on page 243 and Critical speed n cr on page 260 C 0 1) Bosch Rexroth AG, R ( )

207 Planetary Screw Assemblies PLSA Screw Assemblies Nuts 207 BB1 BB2 D 7 S D 7 S 8x45 6x60 +0,5 D 1 +0, 1 D 1g6 D 5 L 3 L 4 L D 6 D 6 d 0 x P (mm) Weight D 1 D 5 Hole pattern L D 6 D 7 L 3 L 4 L 5 S m (kg) 20 x 5R BB M x 5R BB M x 10R BB M x 5R BB M8 x x 10R BB M8 x x 5R BB M8 x x 10R BB M8 x x 10R BB M8 x x 20R BB M8 x x 10R BB M8 x x 20R BB M8 x Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

208 208 Screw Assemblies Planetary Screw Assemblies PLSA Nuts Flanged Single Nut, split FDM-E-S With standard seals With preload For precision screws PSR in tolerance grade T5, T7 Note: Delivered only as a complete unit. Ordering code PLSA: PLSA 20 x 5R FDM-E-S T5 R 812Z Z C = dynamic load rating C 0 = static load rating d 0 x P = size d 0 = nominal diameter no. = part number P = lead (R = right-hand) S = lube port = maximum linear speed v max d 0 x P no. C 1) v 2) max (kn) (kn) (m/min) 20 x 5R R157C A x 5R R157C x 10R R157C x 5R R157C x 10R R157C x 5R R157C x 10R R157C x 10R R157C x 20R R157C ) The load ratings are valid for tolerance grade T5 only. For other tolerance grades, please consider the correction factor f ac on page ) See Characteristic speed on page 243 and Critical speed n cr on page 260 C 0 1) Bosch Rexroth AG, R ( )

209 Planetary Screw Assemblies PLSA Screw Assemblies Nuts 209 D 7 S 6x60 +0,5 D 1 +0, 1 D 1g6 D 5 L 3 L 4 L D 6 d 0 x P (mm) Weight D 1 D 5 L D 6 D 7 L 3 L 4 L 5 S m (kg) 20 x 5R M x 5R M x 10R M x 5R M x 10R M x 5R M8 x x 10R M8 x x 10R M8 x x 20R M8 x Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

210 210 Screw Assemblies Planetary Screw Assemblies PLSA Screws Precision Screw PSR Bosch Rexroth AG, R ( )

211 Planetary Screw Assemblies PLSA Screw Assemblies Screws 211 d 2 d 0 d 1 L tot d 0 x P (mm) Weight Length J s m d 1 d 2 Standard on request (kgcm 2 /m) (kg/m) 20 x 5R x 5R x 10R x 5R x 10R x 5R x 10R x 10R x 20R x 10R x 20R Precision screws PSR, with mechanically connected screw ends These screws consist of a precision screw part and an unmachined spigot (as the screw journal). The spigot is mechanically connected on one side and is available in different sizes. We have a solution to prevent problems arising from big end bearing diameters (e.g. visible thread grooves or axial contact faces which are too small for the fixed bearing). Please consult us. Separate delivery of a screw without end machining and without nut is not planned. d 0 x P = size d 0 = nominal diameter J s = moment of inertia P = lead (R = right-hand) C mechanically connected L S L tot 0,5 C L R 0,5 x 45 d 0 x P Tolerance grade (mm) (mm) D R L R L tot L S x 5R x 5R/10R x 5R/10R T x 5R/10R x 10R/20R x 10R/20R D R Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

212 212 Screw Assemblies Planetary Screw Assemblies PLSA Screw Ends Screw ends, forms for a left or right screw end Basic version With keyway Cut to size only T End mechanically connected with/without keyway Machining of end face Z Centering hole DIN 332-D S Hex socket Bosch Rexroth AG, R ( )

213 Planetary Screw Assemblies PLSA Screw Assemblies Screw Ends 213 Form 002 Option (machining of end face) Z t Z 002 d 0 x P PLSA 20 x 5R FEM-E-S T7 R 002K K Planetary Screw Assemblies PLSA Z S t S S K None Ordering code: Form Version (mm) d 0 x P Z t Z S t S x 5 M x 5/10 M x 5/10 M x 5/10 M x 10/20 M x 10/20 M d 0 x P = size d 0 = nominal diameter P = lead (R = right-hand) S = hex socket Z = centering hole R ( ), Bosch Rexroth AG

214 214 Screw Assemblies Planetary Screw Assemblies PLSA Screw Ends Form 312 Option (machining of end face) Z t Z Z Undercut DIN 509 Undercut for retaining ring DIN 471 (3x) L4 L 4 LS 1 S t S S 312 ST 1 S 1 D 1 K None L 5 Application L jl Ordering code: PLSA 20 x 5R FEM-E-S T7 R 312Z K Form Version 1) (mm) D 1 L jl L 4 L 5 S 1 ST1 LS 1 Z t Z S t S d 0 x P j6 H x 5R h M x 5R h M x 5R/10R h M x 5R/10R h M x 5R/10R h M x 5R/10R h M x 10R/20R h M x 10R/20R h M ) The allocation of screw ends to the bearing units is defined by the version. Note: Form 312 with two floating bearings increases the critical speed, see Critical speed n cr on page 260. d 0 x P = size d 0 = nominal diameter No. = part number P = lead (R = right-hand) S = hex socket Z = centering hole Bosch Rexroth AG, R ( )

215 Planetary Screw Assemblies PLSA Screw Assemblies Screw Ends 215 End bearings for screw ends Form 312 The bearing unit LAD consists of: 1 bearing (2x required) 2 retaining rings Form Version d 0 x P LAD no x 5R R x 5R R x 5R/10R R x 5R/10R R x 5R/10R R x 5R/10R R x 10R/20R R x 10R/20R R Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

216 216 Screw Assemblies Planetary Screw Assemblies PLSA Screw Ends Form 412 Option (machining of end face) Z t Z Z Undercut DIN 509 Undercut for retaining ring DIN 471 S t S S L 4 LS D 1 ST 1 S 1 K None L jl Application Ordering code: PLSA 20 x 5R FEM-E-S T7 R 412Z K Form Version 1) (mm) d 0 x P D 1 L jl L 4 S 1 ST1 LS 1 Z t Z S t S j6 H x 5R h M x 5R h M x 5R/10R h M x 5R/10R h M x 5R/10R h M x 5R/10R h M x 10R/20R h M x 10R/20R h M ) The allocation of screw ends to the bearing units is defined by the version. d 0 x P = size d 0 = nominal diameter No. = part number P = lead (R = right-hand) S = hex socket Z = centering hole Bosch Rexroth AG, R ( )

217 Planetary Screw Assemblies PLSA Screw Assemblies Screw Ends 217 End bearings for screw ends Form 412 The bearing unit LAD consists of: 1 bearing 2 retaining rings Form Version d 0 x P LAD no x 5R R x 5R R x 5R/10R R x 5R/10R R x 5R/10R R x 5R/10R R x 10R/20R R x 10R/20R R Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

218 218 Screw Assemblies Planetary Screw Assemblies PLSA Screw Ends Form 812 Undercut DIN 509 Thread undercut DIN 76 short Undercut DIN 509 Option (machining of end face) Z t Z Z 812 D 1 G 1 D 2 S t S S b x l x t K None 822 Application L 1 LG 1 L2 L jf Form 822 next page Ordering code: PLSA 20 x 5R FEM-E-S T7 R 812Z Z Form Version 1) (mm) Mp (Nm) d 0 x P L jf D 1 L 1 D 2 L 2 G 1 LG 1 Z t Z S t S h6 h x 5R M15x1 22 M x 5R M15x1 22 M x 5R M20x1 22 M x 10R M20x1 22 M x 5R M20x1 22 M x 10R M20x1 22 M x 5R M30x M x 10R M30x M x 5R M30x M x 10R M30x M x 5R M35x M x 10R M35x M x 5R M35x M x 10R M35x M x 10R M45x M x 20R M45x M x 10R M60x2 31 M x 20R M60x2 31 M ) The allocation of screw ends to the bearing units is defined by the version. d 0 x P = size d 0 = nominal diameter No. = part number P = lead (R = right-hand) S = hex socket Z = centering hole = maximum permissible drive torque (precondition: no radial load at drive journal) M p Bosch Rexroth AG, R ( )

219 Planetary Screw Assemblies PLSA Screw Assemblies Screw Ends 219 End bearings for screw ends Form 812 The bearing unit LAF, LAN, LAS consists of: 1 bearing 1 slotted nut LAF LAN LAS Form Version no. d 0 x P LAF LAN LAS x 5R R159A R159A x 5R R159A x 5R R159A R159A x 10R R159A R159A x 5R R159A x 10R R159A x 5R R R x 10R R R x 5R R159A x 10R R159A x 5R R159A R159A x 10R R159A R159A x 5R R159A x 10R R159A x 10R R159A x 20R R159A x 10R R159A x 20R R159A Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

220 220 Screw Assemblies Planetary Screw Assemblies PLSA Screw Ends Form 822 Undercut DIN 509 Thread undercut DIN 76 short Undercut DIN 509 Option (machining of end face) Z t Z Z 812 D 1 G 1 D 2 S t S S b x l x t K None 822 Application L 1 LG 1 L2 L jf Ordering code: PLSA 20 x 5R FEM-E-S T7 R 822Z Z Form Version 1) (mm) Mp (Nm) Keyway as per DIN 6885 d 0 x P L jf D 1 L 1 D 2 L 2 G 1 LG 1 b l t Z t Z S t S h6 h7 P x 5R M15x M x 5R M15x M x 5R M20x M x 10R M20x M x 5R M20x M x 10R M20x M x 5R M30x M x 10R M30x M x 5R M30x M x 10R M30x M x 5R M35x M x 10R M35x M x 5R M35x M x 10R M35x M x 10R M45x M x 20R M45x M x 10R M60x M x 20R M60x M ) The allocation of screw ends to the bearing units is defined by the version. d 0 x P = size d 0 = nominal diameter No. = part number P = lead (R = right-hand) S = hex socket Z = centering hole = maximum permissible drive torque (precondition: no radial load at drive journal) M p Bosch Rexroth AG, R ( )

221 Planetary Screw Assemblies PLSA Screw Assemblies Screw Ends 221 End bearings for screw ends Form 822 The bearing unit LAF, LAN, LAS consists of: 1 bearing 1 slotted nut LAF LAN LAS Form Version no. d 0 x P LAF LAN LAS x 5R R159A R159A x 5R R159A x 5R R159A R159A x 10R R159A R159A x 5R R159A x 10R R159A x 5R R R x 10R R R x 5R R159A x 10R R159A x 5R R159A R159A x 10R R159A R159A x 5R R159A x 10R R159A x 10R R159A x 20R R159A x 10R R159A x 20R R159A Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

222 222 Screw Assemblies Planetary Screw Assemblies PLSA Screw Ends Form 832 Mechanically connected Undercut DIN 509 Thread undercut DIN 76 short Undercut DIN 509 Option (machining of end face) Z t Z Z 832 D F D R D1 G 1 D2 S t S S 842 b x l x t K None Application L 1 LG 1 L 2 LF LR L jf Form 842 next page Ordering code: PLSA 20 x 5R FEM-E-S T7 R 832Z Z Form Version 1) (mm) M p (Nm) d 0 x P L jf D 1 L 1 D 2 L 2 G 1 LG 1 Z t Z S t S h6 h x 5R M20x1 22 M x 5R M25x M x 5R M30x M x 10R M30x M x 5R M35x M x 10R M35x M x 5R M40x M x 10R M40x M x 5R M50x M x 10R M50x M x 5R M50x M x 10R M50x M x 5R M65x2 32 M x 10R M65x2 32 M x 10R M70x2 33 M x 20R M70x2 33 M x 10R M65x2 32 M x 20R M65x2 32 M x 10R M90x2 38 M x 20R M90x2 38 M x 10R M90x2 36 M x 20R M90x2 36 M ) The allocation of screw ends to the bearing units is defined by the version. Bosch Rexroth AG, R ( )

223 Planetary Screw Assemblies PLSA Screw Assemblies Screw Ends 223 End bearings for screw ends Form 832 The bearing unit LAS, FEC-F consists of: 1 bearing 1 slotted nut LAS FEC-F Form Version (mm) no. d 0 x P D R L R D F L F LAS FEC-F x 5R R159A x 5R R159B x 5R R159A x 10R R159A x 5R R159B x 10R R159B x 5R R159A x 10R R159A x 5R R159B x 10R R159B x 5R R159A x 10R R159A x 5R R159B x 10R R159B x 10R R159A x 20R R159A x 10R R159B x 20R R159B x 10R R159A x 20R R159A x 10R R159B x 20R R159B d 0 x P = size d 0 = nominal diameter M p = maximum permissible drive torque (precondition: no radial load at drive journal) No. = part number P = lead (R = right-hand) S = hex socket Z = centering hole Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

224 224 Screw Assemblies Planetary Screw Assemblies PLSA Screw Ends Form 842 Mechanically connected Undercut DIN 509 Thread undercut DIN 76 short Undercut DIN 509 Option (machining of end face) Z t Z Z 832 D F D R D1 G 1 D2 S t S S 842 b x l x t K None Application L 1 LG 1 L 2 LF LR L jf Ordering code: PLSA 20 x 5R FEM-E-S T7 R 842Z Z Form Version 1) (mm) M p (Nm) Keyway as per DIN 6885 d 0 x P L jf D 1 L 1 D 2 L 2 G 1 LG 1 b l t Z t Z S t S h6 h7 P x 5R M20x M x 5R M25x M x 5R M30x M x 10R M30x M x 5R M35x M x 10R M35x M x 5R M40x M x 10R M40x M x 5R M50x M x 10R M50x M x 5R M50x M x 10R M50x M x 5R M65x M x 10R M65x M x 10R M70x M x 20R M70x M x 10R M65x M x 20R M65x M x 10R M90x M x 20R M90x M x 10R M90x M x 20R M90x M ) The allocation of screw ends to the bearing units is defined by the version. Bosch Rexroth AG, R ( )

225 Planetary Screw Assemblies PLSA Screw Assemblies Screw Ends 225 End bearings for screw ends Form 842 The bearing unit LAS, FEC-F consists of: 1 bearing 1 slotted nut LAS FEC-F Form Version (mm) no. d 0 x P D R L R D F L F LAS FEC-F x 5R R159A x 5R R159B x 5R R159A x 10R R159A x 5R R159B x 10R R159B x 5R R159A x 10R R159A x 5R R159B x 10R R159B x 5R R159A x 10R R159A x 5R R159B x 10R R159B x 10R R159A x 20R R159A x 10R R159B x 20R R159B x 10R R159A x 20R R159A x 10R R159B x 20R R159B d 0 x P = size d 0 = nominal diameter M p = maximum permissible drive torque (precondition: no radial load at drive journal) No. = part number P = lead (R = right-hand) S = hex socket Z = centering hole Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

226 226 Screw Assemblies Planetary Screw Assemblies PLSA Accessories Overview Rexroth offers an extensive range of accessories for planetary screw assemblies. These include bearings and slotted nuts. Further information is provided in this section. Bosch Rexroth AG, R ( )

227 Planetary Screw Assemblies PLSA Screw Assemblies Accessories 227 Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

228 228 Screw Assemblies Planetary Screw Assemblies PLSA Accessories Bearing unit LAF Fixed bearing with angular-contact thrust ball bearing LGF Double-thrust, screw-down, series LGF-B- Double-thrust, screw-down, series LGF-C- The bearing unit consists of: angular-contact thrust ball bearing LGF (not available as a separate part) slotted nut NMA... d 0 x P LAF LGF NMA Weight complete C (N) C 0 (N) M RL (Nm) R fb (N/µm) R kl (Nm/ n G (min 1 ) no. Designation Designation no. m (kg) mrad) 20 x 5R R159A LGF-B-1560 NMA 15x1 R x 5R/10R R159A LGF-C-2068 NMA 20x1 R x 5R/10R R LGF-C-3080 NMA 30x1.5 R x 5R/10R R159A LGF-C-3590 NMA 35x1.5 R Suitable for screw ends: Form C = dynamic load rating C 0 = static load rating d 0 x P = size d 0 = nominal diameter n G = limit speed (grease) No. = part number M RL = Bearing friction torque with seal Rfb = Rigidity (axial) Rkl = Rigidity against tilting P = lead (R = right-hand) Bosch Rexroth AG, R ( )

229 Planetary Screw Assemblies PLSA Screw Assemblies Accessories 229 LGF-B- with slotted nut NMA M6 B R 0,6 min. M6 M6 t 0,5 x t D R 0,3 min. d da 3 J B M6 t d3 D d da Da d3 Da B 1 LGF-C- with slotted nut NMA M6 R 0,6 min. M6 R 0,3 min. 3 B1 J d 0 x P (mm) Mounting holes d D B B 1 J D a d a Number d 3 t min max min max (mm) ( ) 20 x 5R x 5R/10R x 5R/10R x 5R/10R Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

230 230 Screw Assemblies Planetary Screw Assemblies PLSA Accessories Bearing unit LAN Fixed bearing with angularcontact thrust ball bearing LGN Double-thrust Series LGF-B- Double-thrust, in pairs, Series LGF-C- The bearing unit consists of: angular-contact thrust ball bearing LGN (not available as a separate part) slotted nut NMA... d 0 x P LAN LGN NMA Weight C C 0 M RL R fb R kl n G no. Designation Designation no. complete m (kg) (N) (N) (Nm) (N/µm) (Nm/ mrad) (min 1 ) 20 x 5R R159A LGN-B-1545 NMA 15x1 R x 5R/10R R159A LGN-C-2052 NMA 20x1 R x 5R/10R R LGN-C-3062 NMA 30x1.5 R x 5R/10R R159A LGN-C-3572 NMA 35x1.5 R Suitable for screw ends: Form C = dynamic load rating C 0 = static load rating d 0 x P = size d 0 = nominal diameter n G = limit speed (grease) No. = part number M RL = bearing friction torque with seal P = lead (R = right-hand) Rfb = rigidity (axial) Rkl = rigidity against tilting Bosch Rexroth AG, R ( )

231 D d d a D Planetary Screw Assemblies PLSA Screw Assemblies Accessories 231 LGN-B- with slotted nut NMA R 0,6 min. Da R 0,3 min. LGN-C- with slotted nut NMA B R 0,6 min. D a R 0,3 min. d d a B d 0 x P (mm) d D B D a d a min max min max 20 x 5R x 5R/10R x 5R/10R x 5R/10R Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

232 232 Screw Assemblies Planetary Screw Assemblies PLSA Accessories Bearing unit LAD Floating bearing with deepgroove ball bearing The bearing unit consists of: deep-groove ball bearing as per DIN RS retaining ring DIN 471 (2 pcs) d 0 x P LAD Single parts Weight C C 0 Deep-groove ball bearing DIN 625 Retaining ring DIN 471 complete no. Designation no. Designation no. m (kg) (N) (N) 20 x 5R R RS R x1 R R RS R x1 R x 5R/10R R RS R x1.2 R R RS R x1.2 R x 5R/10R R RS R x1.5 R x 5R/10R R RS R x1.5 R x 10R/20R R RS R x2 R x 10R/20R R RS R x2 R Suitable for screw ends: Form C = dynamic load rating C 0 = static load rating d 0 x P = size d 0 = nominal diameter No. = part number P = lead (R = right-hand) Bosch Rexroth AG, R ( )

233 D d Planetary Screw Assemblies PLSA Screw Assemblies Accessories 233 B d 0 x P (mm) d D B 20 x 5R x 5R/10R x 5R/10R x 5R/10R x 10R/20R x 10R/20R Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

234 234 Screw Assemblies Planetary Screw Assemblies PLSA Accessories Bearing unit LAS Fixed bearing with angularcontact thrust ball bearing LGS Double-thrust, series LAS-E The bearing unit consists of: angular-contact thrust ball bearing LGS as per DIN 628 (not available as a separate part) slotted nut NMA... d 0 x P LAS LGS NMA Weight C C 0 n 1) G no. Designation Designation no. complete m (kg) (kn) (kn) (min 1 ) 20 x 5R R159A LGS-E-1542 NMA 15x1 R R159A LGS-E-2047 NMA 20x1 R x 5R/10R R159A LGS-E-2052 NMA 20x1 R R159A LGS-E-3072 NMA 30x1.5 R x 5R/10R R159A LGS-E-3072 NMA 30x1.5 R R159A LGS-E-4090 NMA 40x1.5 R x 5R/10R R159A LGS-E-3580 NMA 35x1.5 R R159A LGS-E NMA 50x1.5 R x 10R/20R R159A LGS-E NMA 45x1.5 R R159A LGS-E NMA 70x2 R x 10R/20R R159A LGS-E NMA 60x2 R R159A LGS-E NMA 90x2 R ) Values as a guide for low bearing load, good heat dissipation and suitable lubricating greases with low consistency Suitable for screw ends: Form C = dynamic load rating C 0 = static load rating d 0 x P = size d 0 = nominal diameter No. = part number n G = limit speed (grease) P = lead (R = right-hand) Bosch Rexroth AG, R ( )

235 Planetary Screw Assemblies PLSA Screw Assemblies Accessories 235 D d d a D a B d 0 x P (mm) d D B D a d a min max min max 20 x 5R x 5R/10R x 5R/10R x 5R/10R x 10R/20R x 10R/20R Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

236 236 Screw Assemblies Planetary Screw Assemblies PLSA Accessories Bearing unit FEC-F Fixed bearing with angularcontact thrust ball bearing LGS The bearing unit consists of: precision flanged housing made of steel angular-contact thrust ball bearing LGS slotted nut NMB The slotted nut is delivered unmounted d 0 x P FEC-F LGS NMB Weight C C 0 M 1) RL R fb R kl n 2) G no. Designation Designation M A complete (Nm) m (kg) (kn) (kn) (Nm) (N/µm) (Nm/mrad) (min 1 ) 20 x 5R R159B LGS-E-2562 NMB 25x x 5R/10R R159B LGS-E-3580 NMB 35x x 5R/10R R159B LGS-E NMB 50x x 5R/10R R159B LGS-E NMB 65x x 10R/20R R159B LGS-E NMB 65x x 10R/20R R159B LGS-E NMB 90x ) Measured at 50 min 1 2) Values as a guide for low bearing load, good heat dissipation and suitable lubricating greases with low consistency Values apply for bearing configuration Bearing configurations or are possible. Please consult us. Suitable for screw ends: Form C = dynamic load rating C 0 = static load rating d 0 x P = size d 0 = nominal diameter No. = part number P = lead (R = right-hand) M RL = bearing friction torque with sealing disk R fb = stiffness (axial) R kl = rigidity against tilting = limit speed (grease) n G Bosch Rexroth AG, R ( )

237 Planetary Screw Assemblies PLSA Screw Assemblies Accessories 237 B 30 D 10 D 3 d D D 1 4x60 L 9 L 5 L 4 L 3 L 2 B D 6 D 7 D 5 d 0 x P (mm) d D B L 2 L 3 L 4 L 5 L 9 D 1 D 3 D 5 D 6 D 7 D 10 h7 20 x 5R x 5R/10R x 5R/10R x 5R/10R x 10R/20R x 10R/20R Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

238 238 Screw Assemblies Planetary Screw Assemblies PLSA Accessories Slotted Nuts NMA for Fixed Bearings Slotted nut NMA For maximum vibratory loads 0,005 A C B f e m g A d D Designation no. (mm) M A F ab M AG Weight d D B c m e f g (Nm) (kn) (Nm) m (g) NMA 15x1 R M15x M NMA 17x1 R M17x M NMA 20x1 R M20x M NMA 25x1.5 R M25x M NMA 30x1.5 R M30x M NMA 35x1.5 R M35x M NMA 40x1.5 R M40x M NMA 45x1.5 R M45x M NMA 50x1.5 R M50x M NMA 60x2 R M60x M NMA 70x2 R M70x M NMA 90x2 R M90x M M A = tightening torque for slotted nut F ab = axial breaking load of slotted nut M AG = tightening torque for set screw No. = part number Bosch Rexroth AG, R ( )

239 e Planetary Screw Assemblies PLSA Screw Assemblies Accessories 239 Housing nut GWR For angular-contact thrust ball bearing LGN For cylindrical single nut ZEM-E-S Note: Use a threadlocker (e.g. Loctite 638) to secure against loosening. 0,01 A A D d B g f Designation no. (mm) Weight D d B e f g m (g) GWR 18x1 R M18x GWR 23x1 R M23x GWR 26x1.5 R M26x GWR 30x1.5 R M30x GWR 36x1.5 R M36x GWR 40x1.5 R M40x GWR 45x1.5 R M45x GWR 50x1.5 R M50x GWR 55x1.5 R M55x GWR 58x1.5 R M58x GWR 60x1 R M60x GWR 62x1.5 R M62x GWR 65x1.5 R M65x GWR 70x1.5 R M70x GWR 78x2 R M78x GWR 92x2 R M92x GWR 112x2 R M112x Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

240 240 Screw Assemblies Planetary Screw Assemblies PLSA Accessories Measuring pads Alignment of the planetary screw assembly in the machine Rexroth can provide a gauge with a self-aligning contact pad for easy alignment of the planetary screw assembly. Two pads of different lengths are available which can be used depending on the screw lead: material no. R : length 33 mm material no. R : length 50 mm Dial gauge not supplied as standard with the planetary screw assembly Bosch Rexroth AG, R ( )

241 Planetary Screw Assemblies PLSA Screw Assemblies Accessories 241 Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

242 242 Screw Assemblies Planetary Screw Assemblies PLSA Technical Data Technical Notes The degree of efficiency determines the torque required to convert the rotary motion into linear motion. Due to their high mechanical efficiency, PLSAs are in principle not self-locking. cc Safety information For installation, customers should check whether separate protection against falling loads is required. Please consult us. Efficiency (%) Ball screw assembly Planetary screw assembly Acme screw Lead angle ( ) Advantages over the Acme screw drive The maximum mechanical efficiency of an Acme screw drive is 50%, whereas a planetary screw assembly can achieve 90%, and a ball screw assembly 98%. Higher life expectancy due to negligible wear during operation Less drive power required No stick-slip effect More precise positioning Higher travel speed Less heat-up Selection criteria for planetary screw assemblies (excerpt) The following factors should be considered when selecting the PLSA for a given application: degree of accuracy required (lead deviation) in-service load conditions service life critical speed buckling load rigidity/permissible clearance or desired preload characteristic speed (max. permissible linear speed) cc Note Radial and eccentric forces relative to the screw must be avoided, as they can affect the PLSA s performance and shorten its life. Where special conditions of use are involved, please consult us. The following points should be taken into consideration when selecting a PLSA that is to be both cost-efficient and optimally designed: The calculation of the service life should be based on average loads and average speeds, not on maximum values. In order for us to provide you with a customized solution, installation drawings or sketches of the nut environment should be enclosed. Bosch Rexroth AG, R ( )

243 Planetary Screw Assemblies PLSA Screw Assemblies Technical Data 243 Static load rating C 0 The static load rating is an axial, concentrically acting force that induces a permanent deformation of x the rolling element diameter. Dynamic load rating C The dynamic load rating is an axial, concentrically acting force of constant magnitude and direction under which 90% of a sufficiently large number of identical PLSAs can achieve a nominal service life of one million revolutions. Correction factor for tolerance grades The static load rating C 0 and the dynamic load rating C must be multiplied by the correction factor f ac as appropriate for the specific tolerance grade of the screw. Tolerance grade T f ac Service life The nominal service life is expressed by the number of revolutions (or number of operating hours at constant speed) that will be attained or exceeded by 90% of a representative sample of identical planetary screw assemblies before the first signs of material fatigue become evident. The nominal life is designated as L or L h h, depending on whether it is specified in revolutions or hours. The nominal life calculation is based on optimal installation and environmental conditions. The service life may be shortened, for example, if the lubrication is affected by exposure to process media. Critical speed and buckling load The critical speed and buckling load can be checked using the corresponding charts. For precise calculations see formula 12 15, in Design Calculations" Characteristic speed Material, hardness d 0 n Rexroth PLSAs can be operated at very high speeds due to their structural design. Characteristic speeds of up to 150,000 are possible depending on the nut type. The characteristic speeds can be exceeded for short periods, please consult us. d 0 n d 0 = nominal diameter (mm) n = speed (min 1 ) The theoretically possible maximum linear speed v max (m/min) is specified on the page featuring the relevant nut. Actually attainable speeds are heavily dependent among other factors on preload and duty cycle. They are generally restricted by the critical speed. (See Design Calculations ). PLSA's are made of high-quality, heat-treatable steel, carbon chrome alloy steels or case-hardened steels. The screw and nut raceways have a minimum Rockwell hardness of HRC 58. The screw ends are not hardened. Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

244 244 Screw Assemblies Planetary Screw Assemblies PLSA Technical Data Technical Notes Sealing PLSAs are precision assemblies that require protection against contamination. Flat protective covers, bellows-type dust boots or other enclosures are particularly suitable for this purpose. As there are some applications in which these methods do not provide sufficient protection, we have developed an additional gapless lip-type seal which ensures an optimal sealing effect and maintains high efficiency due to the low friction level. Our PLSAs can therefore be supplied with lip-type seals as an option. At the customer s request, the seals can be omitted entirely. To ensure that seals retain their functionality, dirt must be removed at regular intervals. Short stroke Short stroke applications = stroke nut length Lubrication: During a short stroke, the planets do not make a real turn. It is therefore impossible for an adequate lubricating film to form. This may result in premature wear. To avoid this, it is sufficient to perform longer strokes at regular intervals with simultaneous relubrication as lubricating strokes. Load rating: Short stroke applications will increase the number of times a rolling load passes over each point within the load zone. This reduces the load rating. Please consult us. Permissible operating temperatures PLSAs are suitable for continuous operation at temperatures up to 80 C with temporary peaks of 100 C (measurements taken on the outer shell of the nut). Permissible operating temperatures: 10 C T operation 80 C Permissible bearing temperatures: 15 C T bearing 80 C Bearing When calculating the life expectancy of the overall system, the end bearings must be considered separately. Bosch Rexroth AG, R ( )

245 Planetary Screw Assemblies PLSA Screw Assemblies Technical Data 245 Acceptance Conditions and Tolerance Grades Permissible travel deviation according to ISO T PLSA with precision screw PSR Symbol definitions: (excerpt) l 0 = nominal travel l 1 = thread length l 0 = travel deviation l u = Useful travel l e = excess travel (the closer tolerances for travel and hardness do not apply here) c = travel compensation (target travel deviation) (standard: c = 0) e p = tolerance mean target travel deviation ν 300p = permissible travel deviation within 300 mm travel ν 2πp = permissible travel deviation within one revolution l e + 0 l l 1 l u 300 ν300p e p e p l e l 0 c = 0 Useful travel l u Tolerance mean actual travel deviation e p (µm) Tolerance grade > e p l u p For precision screws PSR the following values apply in all cases: Non-usable length l e (Excess travel) ν 300p (µm) Tolerance grade d 0 (mm) (mm) 20, 30, , 60, l e Planetary Screw Assemblies PLSA Minimum number of measurements within 300 mm (measuring interval) and excess travel to be taken into consideration. Lead P Minimum number of measurements for tolerance grade (mm) R ( ), Bosch Rexroth AG

246 246 Screw Assemblies Planetary Screw Assemblies PLSA Technical Data Acceptance Conditions and Tolerance Grades Run-outs and location deviations based on DIN ISO Radial run-out t 5 of the outer diameter of the screw over the length l 5 used to determine the straightness in relation to AA. l 5 l 5 l 5 2 d 0 l 1 5p t A A l 5 l 5 5pmax d 0 t 5p AA' A' A 2 d 0 d 0 l 5 t 5pmax in µm for l 5 Tolerance grade > l 1 /d 0 t 5pmax in µm for l 1 4l 5 Tolerance grade > t Coaxial deviation t 6 of the bearing journal in relation to AA' where l 6 l. Tabular value t 6p applies if I 6 reference length I. Where l 6 > l, then t 6a t 6p l 6l t 6p AA' A 2 d 0 l 6 A' d 0 Reference length l t 6p in µm for l 6 l Tolerance grade > d 0 Coaxial deviation t 7 of the journal diameter of the screw in relation to the bearing diameter for l 7 > l. Tabular value t 7p applies if I 7 reference length I. Where l 7 > l, then t 7a t 7p l 7l l 7 C t 7p C Bearing seat d 0 Reference length l t 7p in µm for l 7 l Tolerance grade > = nominal diameter d 0 d 0 Bosch Rexroth AG, R ( )

247 Planetary Screw Assemblies PLSA Screw Assemblies Technical Data 247 Axial run-out t 8 of the shaft (bearing) face of the screw in relation to the bearing diameter. t 8p C d 0 t 8p in µm for tolerance grade d C Bearing seat F d 0 > Axial run-out t 9 of the nut location face in relation to A and A' (for preloaded ball nuts only). A D 5 2 d 0 t 9p AA' A' 2 d 0 d 0F Flange diameter t 9p in µm D 5 for tolerance grade > Radial run-out t 10 of the outer diameter D 1 of the nut unit in relation to A and A' (for preloaded and rotating nuts only). Fix screw to prevent rotation before carrying out the measurement. A 2 d 0 D 1 t 10p AA' fixed A' 2 d 0 d 0 Outer diameter t 10p in µm D 1 for tolerance grade > Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

248 248 Screw Assemblies Planetary Screw Assemblies PLSA Technical Data Preload, Rigidity, Friction Torques Nut system preload In addition to single nuts with reduced backlash, Rexroth supplies preloaded nut systems. Axial movement (deflection) Single nut with backlash preloaded and adjustable-preload nut systems Axial load With preloaded nut systems, the deformation due to load cycling is significantly less than that of systems without preload. Preloaded nut systems should therefore be used in applications requiring a high degree of rigidity. The preload of the planetaryscrew assembly will decrease over time as a function of the load and the operating hours. The screw is typically far less rigid than the nut unit (for details see Overall axial rigidity... ). Rigidity The rigidity of a planetaryscrew assembly is also influenced by all adjoining parts such as bearings, housing bores, nut housings etc. Overall axial rigidity R bs of the planetary screw assembly The overall axial rigidity R bs is made up of the component rigidity of the bearing R fb, the screw R S and the nut unitr nu = R bs R fb R S R nu Rigidity of the bearing R fb The rigidity of the bearings corresponds to the values found in the bearing manufacturer s catalog. See the dimension tables in this catalog for the rigidity values of the bearings that Rexroth can provide. Rigidity of the screw R S The rigidity of the screw R S depends on the type of bearing used. See the corresponding tables for rigidity values. Note: Please note that in most cases the rigidity R S of the screw will be significantly lower than the rigidity R nu of the nut unit. Bosch Rexroth AG, R ( )

249 Planetary Screw Assemblies PLSA Screw Assemblies Technical Data PLSA shaft is fixed at one end 2 PLSA shaft is fixed at both ends l S1 S S2 2 l S2 l S R S /R S1 /R S2 = rigidity of the screw d 0 = nominal diameter l S = distance between bearing and bearing l S2 = distance between bearing and nut (N/µm) (mm) (mm) (mm) R S2 (d 0 ) 2 S2 S S S2 18 The lowest screw rigidity occurs at the center of the screw R S2min ( l S2 = l S /2) and thus equals: (d 0 ) 2 17 (d R 165 (N/ m) 0 ) (N/µm) S1 R S1 S2min S 19 Rigidity in the area of the nut unit R nu See the corresponding tables for rigidity values. Preload and rigidity d 0 x P Backlash of single nut Preload of single nut FEM / ZEM FDM FEM / ZEM standard (mm) R nu (N/µm) T pr0 (Nm) T pr0 (Nm) T pr0 (Nm) T pr0 (Nm) R S N m ( max. min. max. min. max. µm ) 20 x x x x x x x x x x x Dynamic drag torque of the seals Seal torque in the nuts d 0 x P = size R S = rigidity of the screw R nu = rigidity of the nut T RD = dynamic drag torque of the 2 seals T pr0 = dynamic drag torque without seals T 0 = overall dynamic drag torque T 0 = T pr0 + T RD d 0 x P Dynamic drag torque T RD approx. (Nm) Lip-type seal Gap-type seal 20 x x 5/ x 5/ x 5/ x 10/ x 10/ The values given for dynamic drag torque are proven practical indicators for the nut preloading. Planetary Screw Assemblies PLSA R ( ), Bosch Rexroth AG

250 250 Screw Assemblies Planetary Screw Assemblies PLSA Mounting Mounting Condition as delivered Rexroth PLSAs are normally delivered prelubricated with an initial supply of grease. Relubrication is possible, and cartridges and cans of this grease are available. If another lubricant is used, you will need to check that it is compatible with the initial lubrication grease. In special cases, a ball screw assembly with only a preservative coating can be ordered and supplied via the appropriate ordering code. cc Note The selected lubricant must be in the nut before the machine is started. cc Note In systems with gap-type seal (Option 4), the user must apply the stroke-dependent amount of grease in addition. (See section on Lubrication). Cleaning Storage Various cleaning agents can be used to degrease and wash the assembly: aqueous cleaning agents organic cleaning agents c c Note Immediately after cleaning, thoroughly dry all parts and apply a preservative coating or anti-corrosion oil. In all cases, take care to observe the appropriate legal regulations (environmental protection, health and safety at work, etc.) as well as the specifications for the cleaning agent (e.g. handling). Planetary screw assemblies are high-quality systems that must be treated with due care. In order to prevent damage and contamination, the elements should not be removed from the protective wrapping until immediately before installation. Once they have been removed from the packaging, they must be set down on V-shaped cradles. Installation in the machine It is not normally necessary to remove the preservative coating before installation. If the planetary screw assembly is contaminated, it must first be cleaned (see Cleaning ) and re-oiled Push the nut unit into the mounting bore, taking care to avoid any impact force or misalignment. Tighten the mounting screws using a torque wrench if necessary. Maximum tightening torque for the steel/steel material pairing (R m 370 N/mm 2 ), see table. For the steel/aluminum and aluminum/aluminum material pairings (R m 280 N/mm 2 ), the maximum tightening torques specified in the follow table apply. When driving screws into aluminum, the length of thread engagement should be at least 1.5 times the screw diameter. Bosch Rexroth AG, R ( )

251 Planetary Screw Assemblies PLSA Screw Assemblies Mounting 251 Tightening torques for fastening screws according to VDI 2230 where µ G = µ K = Mounting screws cc Always make sure the screws are secure where there are high screw loads! Steel/aluminum and aluminum/ aluminum material pairings Screw diameter (mm) Tightening torque (Nm) Strength classes as per DIN ISO 898: M M M M M M M M M M M Steel/steel material pairing Screw diameter (mm) Tightening torque (Nm) Strength classes as per DIN ISO 898: M M M M M M M M M M M Alignment of the planetary screw assembly in the machine Rexroth can provide a gauge with a self-aligning contact pad for easy alignment of the planetary screw assembly. Two pads of different lengths are available which can be used depending on the screw lead: material no. R : length 33 mm material no. R : length 50 mm Planetary Screw Assemblies PLSA Dial gauge not supplied as standard with the planetary screw assembly R ( ), Bosch Rexroth AG

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