1、Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.AN AMERICAN NATIONAL STANDARD Twist Drills ASME B94.11M-1993(REVISION OF ANSI B94.11-1979)
2、The American Society of Mechanical Engineers 345 East 4 7 t h Street,New York,N.Y.1001 7 Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.D
3、ate of Issuance:March 31,1994 This Standard will be revised when the Society approves the issuance of a new edition.There will be no addenda or written interpretations of the requirements pf this Standard issued to this Edition.ASME is the registered trademark of The American Society of Mechanical E
4、ngineers.This code or standard was developed under procedures accredited as meeting the criteria for American National Standards.The Consensus Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to partic
5、ipate.The proposed code or standard was made available for public review and comment which provides an opportunity for additional public input from industry,academia,regulatory agen-cies,and the public-at-large.ASME does not approve,rate,or endorse any item,construction,praprietary device,or activit
6、y.ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document,and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable Letters Patent,nor assume any such li
7、ability.Users of a code or standard are expressly advised that determination of the validity of any such patent rights,and the risk of infringement of such rights,is entirely their own responsibility.Participation by federal agency representativek)or person(s)affiliated with industry is not to be in
8、terpreted as government or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations issued in accordance with governing ASME procedures and policies which preclude the issuance of interpretations by individual volun-teers.No part of this document may b
9、e reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permission of the publisher.Copyright 0 1994 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in USA.Copyrighted material licensed to Stanford University by Thomson Scientific
10、(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.FOREWORD(This Foreword is not a part of ASME 894.1 1M-1993.)The U.S.A.Standard Twist Drills-Straight Shank(USASI B5-12-1940)Standardized Drill Nomenclature and Majo
11、r Dimensions,Technical Committee No.7 on Twist Drills was established in 1946 and a revision dated March 22,1950 was issued.The committee was reactivated in 1956 and a revision dated December 15,1958 was issued.The committee was again reactivated in 1964 and a redesignated USAS B94.11-1967 was issue
12、d on May 4,1967.The above standard was reaffirmed in 1972 as ANSI B94.11-1967(R1972).Technical Committee No.7 was again reactivated in March 1978 for the purpose of reviewing ANSI B94.11-1967(R1972)and considered a proposed Inch and Metric Standard submitted by the Metal Cutting Tool Institute and i
13、ndustry that reflects current U.S.drill usage.The proposal added metric sizes in jobbers series,screw machine series,taper length series,and tapershank series that were reflective of current industry practices and usage patterns.Metric sizes were not included for core drills,and combined drills and
14、coun-tersinks.In addition the entire standard was dual-dimensioned because of the metric additions.The suggestions were reviewed and a draft was approved by the Technical Committee on November 15,1978 for submission to sectional committee B94 and sponsor organizations of ANSI.The revision was approv
15、ed by the American National Standards Institute on August 29,1979 and redesignated ANSI B94.11M-1979.Following the resignation and retirement of all but one of the members of the Technical Committee No.7,new members were recruited so that revisions suggested by members of the United States Cutting T
16、ool Institute could be considered.A draft of the results of the committees deliberations was approved by the commitee on February 28,1991.In addition to dealing with the USCTI suggestions,the committee also corrected many numerical and editorial errors.Other changes,designed to make this document easier to use,were also recommended.The recommended revision was approved by the American National Standards Institute on September 29,1993 and was redesignated ASME B94.11M-1993.111 Copyrighted materia
