ISO INTERNATIONAL STANDARD 8512-1 First edition 1990-12-01 Surface plates Part 1: Cast iron Marbres de tracage et de controle - Partie 1: Marbres en fonte Reference number ISO8512-1:1990(E) No reproduction or networking pemited without license from IHS Not for Resale ISO 8512-1:1990(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 outthroughIso which a technical committee has been established has 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. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an nter- nationat Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard Iso 8512-1 was prepared by Technical Committee ISO/TC3,Limitsandfits. Iso 8512 consists of the following parts, under the general title Surface plates: --- Part 1: Cast iron Part 2: Granite Annexes A, B, C and D of this part of IsO 8512 are for information only. ISO 1990 All rights reserved.No part of this publication maybe reproduced or utilized in any form permission in writing from the publisher. Iinternational Organization for Standardization CasePostale56·CH-1211Geneve20·Switzeriand Printed in Switzerland ii Copyright lntemational Organizatin for Standardizatin No reproduction or networking permitted without license from IHS Not for Resale ISO 8512-1:1990(E) Introduction Surface plates, for many practicaf purposes, serve the user as a plane or datum surface. Surface plates are made usually of cast iron or granite; other materials may be used provided that they comply with the requirements for quality and accuracy specified in this International Standard. For convenience of presentation Iso8512 comprises two parts,each complete in itself, dealing with cast iron and granite surface plates re- spectively. The choice between cast iron and granite surface plates depends on the conditions of use; some general information about care and use, testing, and moderation in loading of plates is given in annex A, annex B and annex C, respectively. ili Copyriahtlfteatinal Organizatin for Standardization No reproduction or networking perited withoutliense from IHs Not for Resale