ISO INTERNATIONAL STANDARD 3408-5 First edition 2006-06-15 Ball screws Part 5: Static and dynamic axial load ratings and operational life Visabilles- Partie 5: Charges axiales statiques et dynamiques de base et duree de vie Reference number ISO 3408-5:2006(E) @ ISO 2006 ISO 3408-5:2006(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 parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In 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 3408-5:2006(E) Contents Page Foreword. 1 Scope 2 Normative references 3 Terms and definitions. 4 Symbols and subscripts . 4.1 Symbols.. 4.2 Subscripts Basic axial load ratings. 5.1 Basic static axial load rating, Coa*. 5.2 Basic dynamic axial load rating, Ca 6 Modified axial load ratings 6.1 Modified static axial load rating, Coam 6.1.1 General equation... 6.1.2 6.1.3 Correction for accuracy, fac 6.2 Modified dynamic axial load rating, C 6.2.1 General equation.... 6.2.2 Correction for surface hardness, f 6.2.3 Correction for accuracy, fac 6.2.4 Influence of material melting process, fm 7 7.1 Equivalent rotational speed and equivalent axial load.. 7.1.1 General... 7.1.2 Ball screw with backlash between ball nut and screw shaft. 7.1.3 Ball screw with preloaded ball nuts on screw shaft . 10 7.2 Nominal life, L or Lh 12 7.2.1 Ball screw with backlash between ball nut and screw shaft. 12 7.2.2 Ballscrewwithpreloadedballnutsonscrewshaft 13 7.2.3 Resulting life, Lr 13 7.2.4 Nominal life, Lar or Lhar, with reliability factor, far (see Table 3) - 7.3 Modified life, Lm or Lhm.... 14 7.3.1 Ball screw with backlash between ball nut and screw shaft..... 14 7.3.2 Ball screw with preloaded ball nuts on screw shaft .... 14 7.3.3 Modified resulting life, Lmr .... 14 7.3.4 Modified life, Lmar or Lhmar, with reliability factor, far (see Table 3).. zationforStand lion'ghtsreserved ili ISO.3408-5:2006(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. 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 identify