2905 International Standard (ISO INTE RNATIONAL ORGANIZATION FOR STANDARDIZATION MEKAYHAPOAHAA OPTAHM3ALWA NO CTAHAAPTM3AUWMORGANISATION INTERNATIONALE DE NORMALISATION Modular units for machine tool construction -- Spindle noses and adjustable adaptors for multi-spindle heads Elements standards pour la construction des machines-outils -- Nez de broches et douilles de reglage pour tetes multibroches Second edition - 1985-12-01 UDC 621.9-112 Ref. No. ISO 2905-1985 (E) ISO 2905-1985 (E) Descriptors : machine tools, modular structures, spindles, adaptors, dimensions. Price based on 6 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 approval before their acceptance as international Standards by least 75 % approval by the member bodies voting. International Standard ISO 2905 was prepared by Technical Committee ISO/TC 39, Machine tools. IS0 2905 was first published in 1974. This second edition cancels and repiaces the first edition, of which the tolerance on the adjustable adaptor outside diameter, d, has been technically revised. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. International Organization for Standardization, 1985 Printed in Switzerland onforStandardization No reprouction or networking permited withou iense from IHS Not for Resale ISO 2905-1985 (E) INTERNATIONAL STANDARD Modular units for machine tool construction - Spindle noses and adjustable adaptors for multi-spindle heads 1 Scope and field of application 3.2 Interchangeability Spindle noses shall be capable of accepting adjustable adaptors This International Standard specifies dimensions for spindle manufactured in accordance with clause 4. noses for use with adjustable adaptors and quick-change adap- tors used in multi-spindle heads. 3.3 Dimensions It specifies requirements for three types of adjustable adaptors Dimensions shall comply with those given in table 1. to fit taper shank drills, reamers and spot-facing cutters, used in multi-spindle heads. 3.4 Locking screw For reasons of safety, it is important that the locking screw 2 References when tightened does not protrude beyond the outside diameter of the spindle nose. Locking screws are therefore to be reduced ISo 296, Machine tools - Self-holding tapers for tool shanks. in length if necessary; this correction should be carried out when the position of the adjustable adaptor in the spindle nose ISO 2901, /SO metric trapezoidal screw threads - Basic profile corresponds with the maximum wear of the tool. and maximum material profiles. 4 Adjustable adaptors ISO 2903, /SO metric trapezoidal screw threads -- Tolerances. 4.1 Nominal sizes 3 Spindle noses The nominal size of an adaptor shall be its nominal outside diameter, which shall be identical with the nominal bore of the 3.1 Nominal sizes spindle nose with which it is to be used. The range of nominal sizes is as follows : The nominal size of the spindle nose shall be its nominal bore, which shall be identical with the nominal diameter of the ad 8, 10, 12, 16, 20, 25, 28, 36 and 48 mm. justable adaptor with which it is to be used. 4.2 Interchangeability The range of nominal sizes is as follows : Adaptors shall be capable of fitting spindle noses manufactured 8, 10, 12, 16, 20, 25, 28, 36 and 48 mm in accordance with clause