ISO/TR TECHNICAL REPORT 8865 First edition 1990-12-01 ANsi Internat Doc Sec Mining - Guidance on methods of verifying dimensions of sprocket assemblies for chain conveyors Reference number ISO 8865 : 1990 (E) No reproduction or networking permitted without license from IHS Not for Resale ISO/TR8865:1990(E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standardsbodies(lSO memberbodies).Thework ofpreparing International Standards is normallycarried out throughIsO technical committees.Each member bodyinterested ina subjectforwhichatechnicalcommitteehasbeenestablishedhas the right to be represented on that committee. International organizations, govern- mental and 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. The main task of IsO technical committees is to prepare International Standards. In ex- ceptional circumstances a technical committee may propose the publication of a Technical Report of one of the following types: type 1, when the required support cannot be obtained for the publication of an International Standard, despite repeated efforts; type 2, when the subject is still under technical development or where for any otherreasonthereisthefuturebutnot immediatepossibilityofanagreementonan InternationalStandard; type 3, when a technical committee has collected data of a different kind from that which is normaily published as an International Standard ("state of the art", for example). Technical Reports of types 1 and 2 are subject to review within three years of publica- tion, to decide whether they can be transformed into International Standards. Technical Reports of type 3 do not necessarily have to be reviewed until the data they provide are considered to be no longer valid or useful. ISO/TR 8865, which is a Technical Report of type 3, was prepared by Technical Com- mitteeiSO/TC82,Mining,Sub-CommitteeSC2,Componentsofcoalfacemachinery using high-tensile round link chains. International Standard 1so 5613 : 1984 covering drive sprocket assemblies for mining chain conveyors specifies requirements for a range of sprocket assemblies for use with twinoutboard assemblies.These assemblies incorporate sprocket rings designed to ISO 1082 and scraper bars complying with ISo 5612. The dimensions of the component parts of the sprocket assembly are laid down in ISO 5613 and these dimensions have to be verified in order to check compliance with the standard. It is stated that the methods to be used for the verification of the dimen- sions shall be agreed between the purchaser and the manufacturer (IS0 5613 : 1984, 4.3). A number of the dimensions specified, in particular those relating to the tooth profile of the sprocket, cannot be measured by the direct application of conventional measuring instruments and it was decided to give some guidance on the special techni- ques involved. The member bodies participating in the work of ISO/TC 82/SC 2 studied the problem and it was found that a number of varying methods and instruments were used, all equally satisfactory if the appropriate dimensions were controlled to ensure com- patibility with the other components of the chain assembly. The committee therefore came to the conclusion that no one method or instrument general principles and essential features of the checking gauges. This document is therefore published in the form of a Technical Report rather than an International Standard. 1SO1990 All rights reserved. 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 the publisher. International Organization forStandardization Casepostale56CH-1211Geneve20.Switzerland Printed in Switzerland Copyright International Organization for Standardization No repr