ISO INTERNATIONAL STANDARD 54 Second edition 1996-12-15 Cylindrical gears for general engineering and for heavy engineering -- Modules Engrenages cylindriques de mecanique generale et de grosse mecanique --- Modules OSI Reference number ISO54:1996(E) Copyright Intermational Organization for Standardization Provided by IHS censewithIs permitted without license from IHS Not for Resale @ ISO ISO54:1996(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 the right to be represented on that committee. International organizations, governmental and non-governmental, in Commission (IEC) on all matters of electrotechnical standardization. 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. International Standard ISO 54 was prepared by Technical Committee ISO/TC 60, Gears. This second edition cancels and replaces the first edition (IsO 54:1977), which has been technically revised. ?1SO1996 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 . CH-1211 Geneve 20 . Switzerland Internet [email protected] X.400 C=ch; a=400net; p=iso; 0=isocs; S=central Printed in Switzerland ii CopyrightIntemationalOrganizationforStandardization Not for Resale ISO 54:1996(E) INTERNATIONAL STANDARD @ISO Cylindrical gears for general engineering and for heavy engineering - Modules 1 Scope This International Standard specifies the values of normal modules for straight and helical gears for general engineering and for heavy engineering. This International Standard is not applicable to gears used in the automotive field. 2 Definition For the purposes of this International Standard the following definition applies. 2.1 module Quotient of the pitch, expressed in milimetres, to the number π, or the quotient of the reference diameter, expressed in millimetres, by the number of teeth. NOTE - The normal module is defined in the normal section of the basic rack1). 3 Values Preference should be given to the use of the normal modules as given in series I in table 1. The module 6,5 of series Il should be avoided. 1) For the definition of "basic rack" see so 53: -, Cylindrical gears for general and heavy engineering -Standardbasic rack tooth profile. [To be published. (Revision of 1SO 53:1974)] 1 Copyright Intermational Organization for Standardizatior Not for Resale