ISO INTERNATIONAL STANDARD 3408-4 First edition 2006-06-15 Ball screws Part 4: Static axial rigidity Visabilles- Partie 4: Rigidite axiale statique Reference number ISO 3408-4:2006(E) @ ISO 2006 ISO 3408-4:2006(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The Iso Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation ? ISO2006 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either isO at the address below or IsO's member body in the country of the requester. ISO copyright office Case postale 56 . CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISO 2006 - All rights reserved ISO 3408-4:2006(E) Contents Page Foreword. 1 Scope 2 Normative references 3 Terms and definitions 4 Symbols and subscripts 4.1 Symbols. 4.2 Subscripts 5 Determination of static axial rigidity, R. 5.1 General.. 5.2 Static axial rigidity, R.... 5.3 Static axial rigidity of ball screw, Rbs 5.4 Static axial rigidity of ball screw shaft, Rs: 5.4.1 General..... 5.4.2 Rigid mounting of ball screw shaft at one end, 5.4.3 Rigid mounting of ball screw shaft at both ends 5.5 Static axial rigidity of ball nut unit, Rnu 5.5.1 Static axial rigidity of ball nut unit with backlash, Rnu 5.5.2 Static axial rigidity of symmetrically preloaded ball nut unit, Rnu2,4 : 5.5.3 Correction for accuracy, f 12 Annex A (informative) Example calculation of static axial rigidity in preloaded symmetrical double nut system.... 14 Annex B (informative) Correction for load application,fal ionghts reserved ili ISO 3408-4:2006(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through IsO technical committees. Each member body interested in a subject for which a technical committee has been non-governmental, in liaison with iso, also take part in the work. Iso collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the IsO/lEc Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO 3408-4 was prepared by Technical Committee ISO/TC 39, Machine tools. Iso 3408 consists of the following parts, under the general title Ball screws: Part 1: Vocabulary and designation Part 2: Nominal diameters and nominal leads Metric series Part 3: Acceptance conditions and acceptance tests Part 4: Static axial rigidity Part 5: Static and dynamic axial load ratings and operational life @ ISO 2006 - All rights reserved INTERNATIONAL STANDARD ISO 3408-4:2006(E) Ball screws Part 4: Static axial rigidity 1 Scope This part of iso 3408 sets forth terms and mathematic