2727 NTERNATIONAL STANDARD (TSO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKAYHAPOAHAR OPIAHW3ALIWA HO CTAHIAPTH3ALWN.ORGANISATION INTERNATIONALE DE NORMALISATION Modular units for machine tool construction - Headstocks First edition - 1973-11-15 ISO 2727-1973 (E) UDC 621.9 Ref.No. ISO 2727-1973 (E) Descriptors : machine tools, elements, modular structur Ires,multi-spindlehead,dimensions,interchangeability. Price based on 3 pages FOREWORD isO (the International Organization for Standardization) is a worldwide federation of national standards institutes (ISO Member Bodies). The work of developing International Standards is carried out through ISo Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set up has the right to be represented on that Committee. International organizations, governmental 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 approval before their acceptance as International StandardsbytheIsoCouncil. International Standard IS02727 was drawn up by Technical Committee ISO/TC 39,Machine-tools, and circulated to the Member Bodies in July 1972. It has been approved by the Member Bodies of the following countries : Australia India Switzerland Belgium Ireland Thailand Czechoslovakia Poland Turkey Egypt, Arab Rep. of Romania U.S.A. Germany South Africa, Rep. of Hungary Sweden The Member Bodies of the following countries expressed disapproval of the document on technical grounds : France Japan UnitedKingdom @International Organization for Standardization,1973: Printed in Switzerland ISO 2727-1973 (E) INTERNATIONALSTANDARD Modular units for machine tool construction - Headstocks 1 SCOPEANDFIELDOFAPPLICATION This International Standard specifies certain dimensions relating to the interchangeability of headstocks used in special purpose machines constructed frorn modular units. 2 CLASSIFICATION AND DESIGNATION The designation of each size of headstock is given by the nominal width of the saddle. Nine sizes are adopted, namely : 125, 160,200,250,320,400,500,630 and 800mm. 3SPECIFICATIONS 3.1 Range of nominal sizes from 125 to 250 mm Dimensions shall be in accordance with Table 1. Either a tenon drive or a shaft and key may be used. The height of the centre of the driving spindle shall be in accordance with the values given in Table 1. 3.2 Range of nominal sizes from 320 to 800 mm Dimensions shall be in accordance with Table 2. Either a coupling, or gear drive, or any other suitable form of drive may be used. The height of the centre of the driving spindle is not specified. 1