1、BS EN ISO 1938-2:2017Geometrical product specifications (GPS) Dimensional measuring equipmentPart 2: Reference disk gauges (ISO 1938-2:2017)BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN ISO 1938-2:2017 BRITISH STANDARDNational forewordThis British Standard is
2、 the UK implementation of EN ISO 1938-2:2017.The UK participation in its preparation was entrusted to Technical Committee TDW/4, Technical Product Realization.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to includ
3、e all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017.Published by BSI Standards Limited 2017ISBN 978 0 580 86253 3 ICS 17.040.10; 17.040.30; 17.040.40 Compliance with a British Standard cannot confer immunity from leg
4、al obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2017.Amendments/corrigendum issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 1938-2 February 2017 ICS 17.04
5、0.10; 17.040.30; 17.040.40 English Version Geometrical product specifications (GPS) - Dimensional measuring equipment - Part 2: Reference disk gauges (ISO 1938-2:2017) Spcification gomtrique des produits (GPS) - quipement de mesurage dimensionnel - Partie 2: Disques de rfrence pour calibres (ISO 193
6、8-2:2017)Geometrische Produktspezifikation (GPS) - Lngenprftechnik - Teil 2: Prflehren fr Rachenlehren (ISO 1938-2:2017) This European Standard was approved by CEN on 1 January 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving t
7、his European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official
8、 versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Aus
9、tria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spa
10、in, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwid
11、e for CEN national Members. Ref. No. EN ISO 1938-2:2017 EBS EN ISO 1938-2:2017EN ISO 1938-2:2017 (E) 3 European foreword This document (EN ISO 1938-2:2017) has been prepared by Technical Committee ISO/TC 213 “Dimensional and geometrical product specifications and verification” in collaboration with
12、Technical Committee CEN/TC 290 “Dimensional and geometrical product specification and verification” the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by Augus
13、t 2017 and conflicting national standards shall be withdrawn at the latest by August 2017. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rig
14、hts. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France
15、, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 1938-2:2017 has been approved by CEN as
16、 EN ISO 1938-2:2017 without any modification. BS EN ISO 1938-2:2017ISO 1938-2:2017(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Symbols and abbreviated terms . 25 Design characteristics . 26 Metrological characteristics . 27 Maximum permissible limits on
17、 metrological characteristics . 38 Marking 5Annex A (informative) Material measure (reference) of the working size, WS, of a gap gauge 6Annex B (informative) Relation to the GPS matrix model 9Bibliography .11 ISO 2017 All rights reserved iiiContents PageBS EN ISO 1938-2:2017ISO 1938-2:2017(E)Forewor
18、dISO (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
19、 committee has been established 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. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of elec
20、trotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was d
21、rafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such pate
22、nt rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience of users and does no
23、t constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: h t t p :
24、/ www .iso .org/ iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical product specifications and verification.A list of all parts in the ISO 1938 series can be found on the ISO website.This document does not include requirements for setting pl
25、ug gauges and setting ring gauges, which were dealt with in ISO/R 1938:1971, 3.9.4.This document covers the concepts and principles developed in ISO 14978.iv ISO 2017 All rights reservedBS EN ISO 1938-2:2017ISO 1938-2:2017(E)IntroductionThis document is a Geometrical Product Specification (GPS) stan
26、dard and is to be regarded as a general GPS standard (see ISO 14638). It influences links F and G of the size chain of standards in the general GPS matrix. For more detailed information on the relation of this document to other standards and the GPS matrix model, see Annex B.The ISO/GPS Matrix model
27、 given in ISO 14638 gives an overview of the ISO/GPS system of which this document is a part. The fundamental rules of ISO/GPS given in ISO 8015 apply to this document and the default decision rules given in ISO 14253-1 apply to specifications made in accordance with this document, unless otherwise
28、indicated.The terms and concepts used in this document (compared to ISO/R 1938:1971) have been changed according to needs and terminology in the other GPS standards.This document deals with reference disk gauges. The use of reference disk gauges is explained in Annex A.NOTE The content of Table 2 us
29、es the modifiers given in ISO 14405-1 and ISO 1101. ISO 2017 All rights reserved vBS EN ISO 1938-2:2017BS EN ISO 1938-2:2017Geometrical product specifications (GPS) Dimensional measuring equipment Part 2: Reference disk gauges1 ScopeThis document specifies the most important metrological and design
30、characteristics of reference disk gauges.This document covers linear sizes of the gauge up to 500 mm.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edi
31、tion cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 286-1, Geometrical product specifications (GPS) ISO code system for tolerances on linear sizes Part 1: Basis of tolerances, deviations and fitsISO 1101, Geometrical produc
32、t specifications (GPS) Geometrical tolerancing Tolerances of form, orientation, location and run-outISO 1938-1:2015, Geometrical product specifications (GPS) Dimensional measuring equipment Part 1: Plain limit gauges of linear sizeISO 14405-1, Geometrical product specifications (GPS) Dimensional tol
33、erancing Part 1: Linear sizesISO 17450-2, Geometrical product specifications (GPS) General concepts Part 2: Basic tenets, specifications, operators, uncertainties and ambiguitiesISO/IEC Guide 98-3, Uncertainty of measurement Part 3: Guide to the expression of uncertainty in measurement (GUM: 1995)IS
34、O/IEC Guide 99, International vocabulary of metrology Basic and general concepts and associated terms (VIM)3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 286-1, ISO 1938-1, ISO 14405-1, ISO 17450-2, ISO/IEC Guide 98-3 and ISO/IEC Guide 99 and the fol
35、lowing apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp3.1reference disk gaugegauge designed and intend
36、ed to determine the working size of a gap gaugeINTERNATIONAL STANDARD ISO 1938-2:2017(E) ISO 2017 All rights reserved 1BS EN ISO 1938-2:2017ISO 1938-2:2017(E)3.2unloaded sizeUSperpendicular distance between the gauging faces of a gap gauge when the measuring force is zero3.3working sizeWSdiameter of
37、 a disk over which the gap gauge just passes in a vertical direction under the working load marked on it, or, if this is not indicated, under its own weight4 Symbols and abbreviated termsFor the purposes of this document, the symbols and abbreviated terms given in ISO 1938-1 and Table 1 apply.Table
38、1 Symbols and abbreviated termsSymbols and abbreviated termsDescriptionHptolerance on the size characteristic, S, of a reference disk gaugeref. GO-M reference disk gauge for a new state GO gap gaugeref. GO-U reference disk gauge for a wear limits state GO gap gaugeref. NO GO reference disk gauge for
39、 a NO GO gap gaugeUS unloaded size (of a gap gauge)WS working size (of a gap gauge)5 Design characteristicsFor the purposes of this document, the design characteristics for gauges given in ISO 1938-1 apply.Reference disk gauges can be made as full form cylindrical plug gauges (gauge type A) or as se
40、gmental cylindrical bar gauges (gauge type B).6 Metrological characteristicsThe most important metrological characteristics are the size S and the form characteristics of the measuring feature of the reference disk gauge. To define the metrological characteristic on a reference disk gauge, the modif
41、iers defined in ISO 14405-1 and the symbols defined in ISO 1101 shall be used.This document describes potential metrological characteristics available on reference disk gauges. The final decision to select one or several metrological characteristics is left to the user.Table 2 gives potential metrol
42、ogical characteristics for reference disk gauges, but also complementary design characteristics as defined in Clause 5. Depending on the need of the user, a set of these metrological characteristics shall be defined; by default, the two point size, S, of the gauge limit and the form deviation are re
43、quired.2 ISO 2017 All rights reservedBS EN ISO 1938-2:2017ISO 1938-2:2017(E)Table 2 List of design and metrological characteristics for reference disk gaugesDescriptionComplementary design characteristicsMetrological characteristicsFull form cylindrical plug gauge Gauge type ALGSegmental cylindrical
44、 bar gauge Gauge type BLGBaDefault metrological characteristics to be considered.Cylindricity (form) tolerance value (see ISO 1101).Maximum inscribed (see ISO 14405-1).Minimum circumscribed (see ISO 14405-1).Two point size (see ISO 14405-1).Common tolerance (see ISO 14405-1).Combined zone (see ISO 1
45、101).7 Maximum permissible limits on metrological characteristicsThe positions of tolerance limits for reference disk gauges in relation to workpiece tolerance limits are shown in Figure 1. ISO 2017 All rights reserved 3BS EN ISO 1938-2:2017ISO 1938-2:2017(E)Key1 ref. GO-M2 ref. GO-U3 ref. NO GOFigu
46、re 1 MPL size position for reference disk gaugesThe value for Hp(see Figure 1) is specific for reference disk gauges. It is based on workpiece tolerance grade and workpiece feature size and shall be taken from Table 3.The value of z1, 1and y1(see Figure 1) is specific for each workpiece tolerance gr
47、ade and size and shall be taken from ISO 1938-1:2015, Tables 7 to 11.The requirement on the size, S, of the gauge element shall be in accordance with the following gauge tolerances for new and wear limits state (see Figure 1).a) For a reference disk gauge for a new state GO gap gauge:1) for the uppe
48、r specification limit: USLM, ref. GO-M= USLU, ref. GO-M= USLW z1+ Hp/2;2) for the lower specification limit: LSLM, ref. GO-M= LSLU, ref. GO-M= USLW z1 Hp/2.b) For a reference disk gauge for a wear limits state GO gap gauge:1) for the upper specification limit: USLM, ref. GO-U= USLU, ref. GO-U= USLW+
49、 y1 1+ Hp/2;2) for the lower specification limit: LSLM, ref. GO-U= LSLU, ref. GO-U= USLW+ y1 1 Hp/2.c) For a reference disk gauge for a NO GO gap gauge:1) for the upper specification limit: USLM, ref. NO GO= USLU, ref. NO GO= LSLW+ 1+ Hp/2;2) for the lower specification limit: LSLM, ref. NO GO= LSLU, ref. NO GO= LSLW+ 1 Hp/2.4 ISO 2017 All rights reservedBS EN ISO 1938-2:2017ISO 1938-2:2017(E)Table 3 Values of Hpand F for calculation of MPL of reference disk gauges in standard tolerance
