ASME_B5.50-2015.pdf

AN AM E R IC AN NAT IO NAL STANDARDASME B5.50-2015(Revision of ASME B5.50-2009)7/24 Taper Tool to Spindle Connection for Automatic Tool ChangeASME B5.50-2015(Revision of ASME B5.50-2009)7/24 Taper Tool toSpindle Connectionfor Automatic ToolChangeAN AMERICAN NATIONAL STANDARDTwo Park Avenue New York,NY 10016 USADate of Issuance:September 30,2015This Standard will be revised when the Society approves the issuance of a new edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard.Interpretations are published on the Committee Web page and under go.asme.org/InterpsDatabase.Periodically certain actions of the ASME B5 Committee may be published as Cases.CasesarepublishedontheASMEWebsiteundertheB5CommitteePageatgo.asme.org/B5committee as they are issued.Errata to codes and standards may be posted on the ASME Web site under the Committee Pages toprovide corrections to incorrectly published items,or to correct typographical or grammatical errorsin codes and standards.Such errata shall be used on the date posted.The B5 Committee Page can be found at go.asme.org/B5committee.There is an option available toautomatically receive an e-mail notification when errata are posted to a particular code or standard.ThisoptioncanbefoundontheappropriateCommitteePageafterselecting“Errata”inthe“PublicationInformation”section.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria for American NationalStandards.The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate.The proposed code or standard was madeavailable forpublic review andcomment thatprovides an opportunityfor additional publicinput from industry,academia,regulatory agencies,and the public-at-large.ASME does not“approve,”“rate,”or“endorse”any item,construction,proprietary device,or activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection with anyitems mentioned in this document,and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent,nor assumes any such liability.Users of a code or standard are expresslyadvised that determination of the validity of any such patent rights,and the risk of infringement of such rights,isentirely their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not to be interpreted asgovernment or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the establishedASME procedures and policies,which precludes the issuance of interpretations by individuals.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical EngineersTwo Park Avenue,New York,NY 10016-5990Copyright 2015 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B5 Committee.vi1General.12Essential Dimensions for 7/24 Taper Toolholder Shank.23Essential Dimensions for Retention Knobs.24Essential Dimensions for 7/24 Taper Spindle Sockets.2Figure1Optional Face-Mount Holes,7/24 Taper Spindle Socket.2Tables1Essential Dimensions of Basic Toolholder Shanks for Machining Centers WithAutomatic Tool Changers.32Essential Dimensions of Retention Knobs.53Essential Dimensions of 7/24 Taper Spindle Socket.7Nonmandatory AppendicesAUseful Technical Information.9BExcerpt From ISO 1947:1973,System of Cone Tolerances for Conical WorkpiecesFrom C p 1:3 to 1:500 and Lengths From 6 to 630 mm.11iiiFOREWORDThe Aerospace Industries Association(AIA)developed,in cooperation with machine toolbuilders and users,standards of toolholder shanks and retention knobs for machining centerswith automatic tool changers.AIA/NAS 970 was first published in 1964.The objective of thisstandardizationeffortwastoreducethelargenumberofalreadyexistingtoolshankconfigurationsand to prevent the creation of new ones.The toolholder shanks made by different machine toolbuilders varied in the methods and in dimensional details of the gripping by the transfer mecha-nism and retention in the machine tool spindle.The resulting lack of interchangeability createdproblems of maintaining large toolholder inventories.The AIA standard covered a series ofstraight and tapered shank toolholders,but the standard never found wide acceptance;onereason for this was that standardization attempted too“early in the art”stifled innovation anddevelopment of better tool shanks for machining centers.During the intervening years,almost every machine tool builder continued to develop its own,oft