8956 (ISO International Standard INTE RNATIONAL ORGANIZATION FOR STANDARDIZATION+MEXAyHAPOAHAH OPrAHM3AuMA nO CTAHAAPTW3AuNM-ORGANISATION INTE RNATIONALE DE NORMALISATION Acceptance conditions for copying attachments, integral or otherwise, for lathes -- Testing of the accuracy Conditions de reception des dispositifs de copiage pour tours, integres ou non - Controle de la precision First edition --- 1986-06-15 UDC 621.941.22-187 Ref. No. 1SO 8956-1986 (E) Descriptors : machine tools, lathes, tests, testing conditions, accuracy. Price based on 11 pages Not for Resale 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 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. Draft International Standards adopted by the technical committees are circulated to the member bodies for approvai before their acceptance as International Standards by the iso Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 8956 was prepared by Technical Committee ISO/TC 39, Machine tools. Users should note that all International Standards undergo revision from time to time latest edition, unless otherwise stated. International Organization for Standardization, 1986 Printed in Switzerland Copyvightlinternational Oorganizatin for Standardization ed without license from IHS Not for Resale INTERNATIONAL STANDARD ISO 8956-1986 (E) Acceptance conditions for copying attachments, integral or otherwise, for lathes - Testing of the accuracy Scope and field of application Iso 6155/1, Acceptance conditions for horizontal spindle -Testing capstan, turret and single spindle automatic lathes- This International Standard describes both special tests and of the accuracy - Part 1: Machinable bar diameters greater than 25 mm. practical tests for copying attachments of general-purpose nor- mal precision (centre lathes, vertical boring machines, capstan lathes or others) and copying lathes. These tests are intended to supplement the tests for the various types of lathes. 3 Preliminary remarks This International Standard applies to hydraulic and electric servo-controlled copying attachments but not to mechanically The preliminary remarks in iSO 1708, ISO 3655 and ISO 6155/1 controlled ones. are also applicable to this International Standard. It also applies to lathes with single-axis copying systems and to Tests carried out on copying lathes shall be performed with the lathes where two axes are used in conjunction to produce a copying unit in position on the machine or integral with it. profile of up to 180o included angle. Turning 1 machines equipped with two-axis systems of more than 180° capability are considered as special-purpose machines; this International Standard does not appiy to such machines. Definitions 4 4.1 single-axis copying system: A system in which a com- 2 References ponent shape is produced by the motion of two slides, one of which is under servo-control from the contact of a stylus Iso 230/1, Acceptance code for machine tools Part 1: against a template while the other has a pre-set generally Geometric accuracy of the machine operating under no load or constant feed motion. In this case the displacement axis of the finishing conditions. stylus is always parallel to the displacement axis of the copying slide. Iso 1708, Acceptance conditions for general purpose parallel lathes -- Testing of the accuracy. 4.2 two-axis copying system: A system in which a com- Iso 3655, Acceptance conditions for vertical turning and boring ponent shape is produced by the motion of two