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LINEAR GUIDES - ROLLER GUIDE RA SERIES

LINEAR GUIDES - ROLLER GUIDE RA SERIES
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LINEAR GUIDES - ROLLER GUIDE RA SERIES - 1

NSK Linear Guides™ Roller Guide RA Series A roller guide series employing advanced analysis technology offers super-high load capacity and rigidity. The latest series is now available in the random matching of rails and roller slides, which includes random matching with preload for higher accuracy and rigidity, allowing the users to select rails and roller slides in single unit quantities. CAT. No.E3328f 2011 A-9 Printed in Japan ©NSK Ltd. 2003

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LINEAR GUIDES - ROLLER GUIDE RA SERIES - 2

The fruits of comprehensive technology of NSK. RA series roller guides handle a diversity of applications The RA series of roller guides is the product of a combination of NSK’s extensive experience in roller bearings and linear guide technologies. The result is an optimal design that takes full advantage of NSK’s unique expertise to realize super-high load capacity, rigidity and motion accuracy, plus smooth motion. Capable of handling a variety of applications, the RA series supports high machine performance. Optimal Design NSK executed a comprehensive, detailed performance simulation of...

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LINEAR GUIDES - ROLLER GUIDE RA SERIES - 3

A variety of contributions to improve the performance of machine Roller Guide RA Series Features 1. Super-high load capacity 5. Smooth motion By installing rollers that are the largest possible diameter and length within the existing standard cross-section dimension in a rational layout based on analysis technology, we have realized the world’s highest load capacity✽, far superior to conventional roller guides. Super-long life is achieved and impact load can be sufciently handled. Installing a retaining piece between rollers and restraining the skew peculiar to roller bearings achieve...

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LINEAR GUIDES - ROLLER GUIDE RA SERIES - 4

Abundant variations to meet a wide variety of needs 1. Roller Slide Types and Shapes • Two types of roller slides are available in this series: one with a mounting flange and a square type with tapped • A compact, low-profile square type is now available. • On the mounting hole of the flange type, the tapped part is used to fix the roller slide from the top surface, and the minor diameter can be used as a bolt hole from the bottom. This provides mounting from both directions, • Roller slide length can be specified by standard high load type or special long, super-high load type. Roller...

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LINEAR GUIDES - ROLLER GUIDE RA SERIES - 5

Roller Guide RA Series 3. Preload and Rigidity 4. Basic Load Rating and Rated Life Preload is set for the RA series by slightly changing the size of the roller used. Applying preload enhances rigidity and minimizes elastic deformation. With the characteristics of the roller guide, there is minimal variation in rigidity according to amount of preload. Because the RA series offers stable, high rigidity, only medium preload type Z3 (preload: 10% of C, where C is the basic dynamic load rating) is set. Typical measurements for preload and rigidity are as follows. Table 3 Preload Model No. Fig. 5...

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LINEAR GUIDES - ROLLER GUIDE RA SERIES - 6

Roller Guide RA Series 5. Lubrication Specications Fig. 8 Mounting position of lubrication accessories (1) Mounting position of lubrication accessories • The standard position of grease ttings and tube ttings is the end face of the roller slide. (Fig. 8) A lubrication hole can be provided on the side or the top face of the end cap or roller slide. Mounting positions are shown in the Figs. 8 and 9, and Tables 7.1 and 7.2. • For mounting on top of the face of end cap, an O ring is required. For the model AN and BN, two O rings as well as spacers are required. • When using a piping unit with a...

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LINEAR GUIDES - ROLLER GUIDE RA SERIES - 7

Roller Guide RA Series 6. Dust-proof RA series is equipped with end, inner ✽ and bottom seals to prevent foreign matter from entering the inside of the roller slide. Under normal applications, the RA series can be used without modication. For severe usage conditions, optional rail covers are available. Contact NSK for information on how to mount the cover. The linear guide can also be equipped with a lubrication unit NSK K1 that has already proven its effectiveness with other NSK Linear Guides. Fig. 11 Rail cover Fig. 13 End conguration of rail equipped with the rail cover (10.5) Cover...

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LINEAR GUIDES - ROLLER GUIDE RA SERIES - 8

Roller Guide RA Series 7. Installation 8. Maximum rail length (1) Mounting tolerance Table15 shows the limitations of rail length. However, the limitations vary by accuracy grades. Mounting tolerance results in harmful effects such as shortened operating life, deterioration in motion accuracy, and friction variation. NSK particularly focuses on operating life, and sets an operating life value of more than 10 000 km calculated under the following conditions as mounting tolerance: ● The load per roller slide is 10% of basic dynamic load rating C. ● The rigidity of machine is innite. The...

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LINEAR GUIDES - ROLLER GUIDE RA SERIES - 10

RA Series dimension table Roller Guide RA Series Low prole type (tapped mounting holes) RA–AL (High-load type/standard), RA–BL (Super-high-load type/long) M YO Assembly Assembly Example of specification number: ✽ ✽ P6 Z RA 35 1000 AL C 2 Series code Preload code 3: Z3 Medium preload Z: Random matching with preload Size No. Accuracy grade∗2 (Without NSK K1): P3, P4, P5, P6 (With NSK K1): K3, K4, K5, K6 Rail length (mm) Roller slide shape code AL, BL (N) L L1 W Number of roller slides per rail 6-M×Pitch Depth B B1 Design number Material and surface treatment code, C: Special high carbon steel...

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LINEAR GUIDES - ROLLER GUIDE RA SERIES - 12

Worldwide Sales Offices and Manufacturing Plants P: Phone F: Fax C: Country Code Printed in Japan NSK LTD.-HEADQUARTERS, TOKYO, JAPAN Nissei Bldg., 1-6-3 Ohsaki, Shinagawa-ku, Tokyo 141-8560, Japan INDUSTRIAL MACHINERY BUSINESS DIVISION-HEADQUARTERS GLOBAL AFTERMARKET DEPARTMENT PRECISION MACHINERY DEPARTMENT MECHATRONICS BUSINESS DEPARTMENT AUTOMOTIVE BUSINESS DIVISION-HEADQUARTERS South Africa: JOHANNESBURG 25 Galaxy Avenue, Linbro Business Park, Sandton, Gauteng, P.O. Box 1157, Kelvin, 2054, South Africa MELBOURNE 11 Dalmore Drive, Scoresby, Victoria 3179, Australia SYDNEY 24-28 River...

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