2014_2019.pdf

AN AM E R IC AN NAT IO NAL STANDARD ASME B89.7.2-2014Revision of ASME B89.7.2-1999(R2004)Dimensional Measurement PlanningASME B89.7.2-2014Dimensional Measurement PlanningA N A M E R I C A N N A T I O N A L S T A N D A R DRevision of ASME B89.7.2-1999(R2004)Two Park Avenue New York,NY 10016 USADate of Issuance:December 29,2014This 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 this Standard.Interpretations are published on the Committee Web page and under go.asme.org/InterpsDatabase.Periodically certain actions of the ASME B89 Committee may be published as Cases.Cases are published on the ASME Web site under the B89 Committee Page at go.asme.org/B89committee as they are issued.Errata to codes and standards may be posted on the ASME Web site under the Committee Pages to provide correc-tions to incorrectly published items,or to correct typographical or grammatical errors in codes and standards.Such errata shall be used on the date posted.The B89 Committee Page can be found at go.asme.org/B89committee.There is an option available to automatically receive an e-mail notification when errata are posted to a particular code or standard.This option can be found on the appropriate Committee Page after selecting“Errata”in the“Publication Information”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 National Standards.The Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate.The proposed code or standard was made available for public review and comment that provides an opportunity for additional public input 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 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 liability.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 representative(s)or person(s)affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME 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 2014 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.iiiCONTENTSForeword .ivCommittee Roster.viCorrespondence With the B89 Committee .vii1 Scope .12 Definitions .13 Normative References .24 Dimensional Measurement Planning .25 Dimensional Measurement Plan Approval .36 Dimensional Measurement Plan Application .37 References .3Nonmandatory AppendicesA Sample Dimensional Measurement Plan.5B Gage Selection.17C Dimensional Measurement Uncertainty.21D Probabilities of Pass and Fail Errors.29ivFOREWORDThe intent of this Standard is to facilitate agreement between suppliers and customers by specifying a standard method for assessing the dimensional acceptability of workpieces.Components of the method are the preparation of an adequate dimensional measurement plan and the use of the plan in making measurements.Major inputs to the method are dimensional specifications developed,for example,in compliance with ASME Y14.5-2009,Dimensioning and Tolerancing 1.The first publication of ASME Y14.5 was a significant step forward in manufacturing because it defined methods for the unambiguous expression of design intent on workpiece drawings.ASME Y14.5 specifies design intent in terms of workpiece features(e.g.,cylinders,planes,spheres,etc.).A feature is dimensioned and toleranced by specifying boundaries within which the infinite number of points on the feature surface must lie(for surface geometries)or by specifying a boundary within which the axes must lie(axes control).Any adequate assessment of whether a manu-factured feature complies with an ASME Y14.5 drawing specification must consider this infinite number of points.In the early days of ASME Y14.5,serious attempts to determine compliance of workpiece features with drawing specifications were based on