© ISO 2017 Geometrical product specifications (GPS) — Dimensional measuring equipment — Part 2 Reference disk gauges Spécification géométrique des produits (GPS) — Équipement de mesurage dimensionnel[.]
INTERNATIONAL STANDARD ISO 93 8-2 First edition 2017-01 Geometrical product specifications (GPS) — Dimensional measuring equipment — Part 2: Reference disk gauges Spécification géométrique des produits (GPS) — Équipement de mesurage dimensionnel — Partie 2: Disques de référence pour calibres Reference number ISO 1938-2:2017(E) © ISO 2017 ISO 93 8-2 : 01 7(E) COPYRIGHT PROTECTED DOCUMENT © ISO 2017, Published in Switzerland All rights reserved Unless otherwise specified, no part o f this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission Permission can be requested from either ISO at the address below or ISO’s member body in the country o f the requester ISO copyright o ffice Ch de Blandonnet • CP 401 CH-1214 Vernier, Geneva, Switzerland Tel +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org ii © ISO 2017 – All rights reserved ISO 93 8-2 : 01 7(E) Contents Page iv Introduction v Scope Normative references Terms and definitions Symbols and abbreviated terms Design characteristics Metrological characteristics Maximum permissible limits on metrological characteristics Marking Annex A (informative) Material measure (reference) o f the working size, WS, o f a gap gauge Annex B (informative) Relation to the GPS matrix model Bibliography 1 Foreword © ISO 2017 – All rights reserved iii ISO 93 8-2 : 01 7(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies) The work o f 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, 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 o f electrotechnical standardization The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part In particular the different approval criteria needed for the di fferent types o f ISO documents should be noted This document was dra fted in accordance with the editorial rules of the ISO/IEC Directives, Part (see www.iso org/directives) Attention is drawn to the possibility that some o f the elements o f this document may be the subject o f patent rights ISO shall not be held responsible for identi fying any or all such patent rights Details o f any patent rights identified during the development o f 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 in formation given for the convenience o f users and does not constitute an endorsement For an explanation on the meaning o f ISO specific terms and expressions related to formity assessment, as well as information about ISO’s adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: http:///www.iso org/iso/ foreword html This document was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical product 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 plug 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 specifications and verification iv © ISO 2017 – All rights reserved ISO 93 8-2 : 01 7(E) Introduction T h i s c u ment i s a G e ome tric a l P ro duc t Sp e c i fic ation (GP S ) s ta nda rd and i s to b e regarde d a s a genera l GP S s ta ndard (s e e I S O 14 8) I t i n fluence s l i n ks F a nd G o f the s i ze cha i n o f s tanda rd s i n the genera l GPS matrix For more detailed information on the relation of this document to other standards and the GPS matrix model, see Annex B T he I S O/GP S M atri x mo del given i n I S O 14 gi ve s an over view o f the I S O/GP S s ys tem o f wh ich th i s c u ment i s a p ar t T he fu nda menta l ru le s o f I S O/GP S given i n I S O 01 app ly to th i s c u ment a nd the de fau lt de ci s ion ru le s given i n I S O 142 -1 apply to s p e ci fic ation s made i n accordance with th i s document, unless otherwise indicated The terms and concepts used in this document (compared to ISO/R 1938:1971) have been changed accord i ng to ne e d s and term i nolo g y i n the o ther GP S s tandard s This document deals with reference disk gauges The use of reference disk gauges is explained in Annex A NOTE The content of Table © ISO 2017 – All rights reserved u s e s the mo d i fiers gi ven i n I S O 14 -1 a nd I S O 101 v INTERNATIONAL STANDARD ISO 93 8-2 : 01 7(E) Geometrical product specifications (GPS) — Dimensional measuring equipment — Part 2: Re ference disk gauges Scope T h i s c u ment s p e c i fie s the mo s t i mp o r ta nt me tro lo g ic a l a nd de s i g n ch a rac ter i s tic s o f re ference disk gauges This document covers linear sizes of the gauge up to 500 mm Normative references T he fol lowi ng c u ments are re ferre d to i n the tex t i n s uch a way th at s ome or a l l o f thei r content s titute s re qu i rements o f th i s c u ment For date d re ference s , on ly the e d ition cite d appl ie s For u ndate d re ference s , the late s t e d ition o f the re ference d c ument (i nclud i ng a ny amend ments) appl ie s ISO 286-1, Geometrical product specifications (GPS) — ISO code system for tolerances on linear sizes — Part 1: Basis o f tolerances, deviations and fits ISO 1101, Geometrical product specifications (GPS) — Geometrical tolerancing — Tolerances of form, orientation, location and run-out ISO 1938-1:2015, Geometrical product specifications (GPS) — Dimensional measuring equipment — Part 1: Plain limit gauges o f linear size ISO 14405-1, Geometrical product specifications (GPS) — Dimensional tolerancing — Part 1: Linear sizes ISO 17450-2, Geometrical product specifications (GPS) — General concepts — Part 2: Basic tenets, specifications, operators, uncertainties and ambiguities ISO/IEC Guide 98-3, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) ISO/IEC Guide 99, International vocabulary of metrology — Basic and general concepts and associated terms (VIM) Terms and definitions For the pu rp o s e s o f th i s c ument, the term s a nd defi n ition s given i n I S O -1 , I S O 19 -1 , I S O 14 -1 , I S O 1745 -2 , I S O/I E C Gu ide -3 and I S O/I E C Guide 9 a nd the fol lowi ng apply ISO and IEC maintain terminological databases for use in standardization at the following addresses: — IEC Electropedia: available at http://www.electropedia org/ — ISO Online browsing platform: available at http://www.iso org/obp reference disk gauge gauge designed and intended to determine the working size of a gap gauge © ISO 2017 – All rights reserved ISO 93 8-2 : 01 7(E) 3.2 unloaded size US perpendicular distance between the gauging faces of a gap gauge when the measuring force is zero 3.3 working size WS diameter o f 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 weight Symbols and abbreviated terms For the purposes o f this document, the symbols and abbreviated terms given in Table apply ISO 1938-1 and Table — Symbols and abbreviated terms Symbols and abbreviated terms Hp ref GO-M ref GO-U ref NO GO US WS Description tolerance on the size characteristic, S, of a reference disk gauge reference disk gauge for a new state GO gap gauge reference disk gauge for a wear limits state GO gap gauge reference disk gauge for a NO GO gap gauge unloaded size (of a gap gauge) working size (of a gap gauge) Design characteristics For the purposes o f this document, the design characteristics for gauges given in ISO 1938-1 apply Re ference disk gauges can be made as full form cylindrical plug gauges (gauge type A) or as segmental cylindrical bar gauges (gauge type B) Metrological characteristics The most important metrological characteristics are the size S and the form characteristics of the measuring feature o f the re ference disk gauge To define the metrological characteristic on a re ference disk gauge, the modifiers 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 le ft to the user Table gives potential metrological characteristics for reference disk gauges, but also complementary design characteristics as defined in Clause Depending on the need of the user, a set of these metrological characteristics shall be defined; by de fault, the two point size, S, o f the gauge limit and the form deviation are required © ISO 2017 – All rights reserved ISO 93 8-2 : 01 7(E) Table — List o f design and metrological characteristics for reference disk gauges Description Full form cylindrical plug gauge — Gauge type A Complementary design characteristics Metrological characteristics LG Segmental cylindrical bar gauge — Gauge type B LG B a Default metrological characteristics to be considered C yl i nd ric ity (for m) tolera nce va lue (s e e I S O 101) 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 1101) Maximum permissible limits on metrological characteristics The positions of tolerance limits for reference disk gauges in relation to workpiece tolerance limits are shown in Figure © ISO 2017 – All rights reserved ISO 93 8-2 : 01 7(E) Key ref GO-M ref GO-U ref NO GO Figure — MPL size position for re ference disk gauges The value for Hp (see Figure f f grade and workpiece feature size and shall be taken from Table The value of z1 , α1 and y1 (see Figure f be taken from ISO 1938-1:2015, Tables 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: f M, ref GO-M = USLU, ref GO-M = USLW – z1 + Hp f M, 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: f M, ref GO-U = USLU, ref GO-U = USLW + y1 – α1 + Hp f M, ref GO-U = LSLU, ref GO-U = USLW + y1 – α1 – Hp/2 c) For a reference disk gauge for a NO GO gap gauge: f M, ref NO GO = USLU, ref NO GO = LSLW + α1 + Hp f M, ref NO GO = LSLU, ref NO GO = LSLW + α1 – Hp/2 ) i s s p e ci fic or re erence d i s k gauge s I t i s b a s e d on workpie ce tolerance ) i s s p e ci fic 1) or the upp er s p ec i fic ation l i m it: US L 2) or the lower s p e ci fic ation l i m it: L S L 1) or the upp er s p e c i fic ation l i m it: US L 2) or the lower s p e ci fic ation l i m it: L S L 1) or the upp er s p e c i fic ation l i m it: US L 2) or the lower s p e ci fic ation l i m it: L S L or e ach workpie ce tolera nce grade a nd s i ze and s l l /2 ; /2 ; /2 ; © ISO 2017 – All rights reserved ISO 93 8-2 : 01 7(E) Table — Values of Size IT6 and IT7 Hp IT1 H p and F for calculation o f MPL o f re ference disk gauges in standard tolerance grades according to ISO 286‑1 Workpiece standard tolerance grades Form 2×F Size IT8 to IT12 Hp IT2 The form limit values are half the values given in column × F Form 2×F IT1 Size IT13 to IT18 Hp IT3 Form 2×F IT2 When the tolerance of the dimension of a feature of size of a workpiece is given as a code according to I S O -1 : 010 , Table and I S O 19 -1 : 01 , Table s to 1 c a n b e u s e d d i re c tly When the s i z e tolerance i s no t given a s an I S O co de, the s tand ard tolera nce grade sha l l b e defi ne d as the s tandard tolerance grade corre s p ond i ng to the fi rs t tolerance i nter va l , T, given i n I S O 19 -1 : 01 , Table s to 11 , lower than or equal to the tolerance interval of the workpiece in the same range of nominal sizes When grades to are associated with the letter N (6N, 7N or 8N), then for the GO gap gauge and their reference disk gauges, the values y1 and α1 are equal to zero Marking E ach re ference d i sk gauge s l l b e le gibly and p erma nently marke d with the — fol lowi ng: s i z e tolerance o f the workpie ce given b y — the workpiece tolerance limits, — — b y I S O co de (nom i na l s i z e va lue o f the workpie ce with the s ymb ol de s ignati ng the tolera nce class according to ISO 286-1), or b y the nom i na l s i z e va lue o f the workpie ce, with the lower and upp er devi ation o f the workpie ce, or with on ly the s u itable devi ation ( lower or upp er) dep end i ng on the gauge typ e (re f G O -M , re f G O - U or re f NO G O) ; — the typ e o f re ference d i s k gauge: re f G O -M for a re ference d i sk gauge for a new s tate G O gap gauge; re f G O - U for a re ference d i sk gauge for a we ar l i m its s tate G O gap gauge; re f NO G O for a re ference d i sk gauge for a NO G O gap gauge; EXAMPLE 20 g6 ref GO-M EXAMPLE 12,1 ±0,15 ref GO-U EXAMPLE 11,95/12,5 ref NO GO — the s eri a l nu mb er (a lph anu meric a l) ; — the manufacturer’s name or trademark The marking shall not be on gauging surfaces and shall not affect the metrological characteristics of the gauges © ISO 2017 – All rights reserved ISO 93 8-2 : 01 7(E) Annex A (informative) Material measure (reference) o f the working size, WS, o f a gap gauge A.1 Interpretation o f size For gap gauges, H determines the limits of the value of the working size, WS, but not of the unloaded s i z e US T he worki ng s i ze o f a gap gauge, however, i s no t defi ne d with a zero me as u ri ng force, as for o ther gauge s , b e c au s e i n u s e, a gap gauge may b e regarde d a s a comp a rator wh ich e ffe c ts a tran s fer measurement between a known dimension, e.g a reference disk gauge and a workpiece I f gap gauge s are veri fie d without applyi ng the s ta nda rd i z e d me a s u ri ng force, e g b y u s i ng a co ord i nate me a s uri ng mach i ne, then it i s ne ce s s a r y to know the ela s tic defle c tion o f the gauge b o dy i n order that the worki ng s i z e c a n b e c a lc u late d by the me a s ure d u n lo ade d s i ze T he me as u re d s i ze i s the s ma l le s t d i s tance o f at le as t five me as u re d leng th s (fou r p o s ition s clo s e to the corners and one at the centre o f the gauging faces) © ISO 2017 – All rights reserved ISO 93 8-2 : 01 7(E) Key ref GO-M ref GO-U ref NO GO new state GO gap gauge NO GO gap gauge Figure A.1 — MPL size position for gap gauges and re ference disk gauges (example for the workpiece dimension 10 h7) T he relation sh ip b e twe en the workpie ce s p e ci fic ation and the M PL s i z e p o s ition for gap gauge s a nd reference disk gauges is shown in Figure A.1 as example for the workpiece dimension 10 h7 NOTE The relation between the tolerance H of the gap gauge and the tolerance Hp of its reference disk gauge is as follows © ISO 2017 – All rights reserved ISO 93 8-2 : 01 7(E) T he d i fference b e twe en the l i m its o f s i z e gi ven b y H to compensate for errors of measurement H and Hp f to be regarded as correct accord i ng to the de fi n ition o a nd b y Hp rep re s ents a s a fe ty z o ne o n b o th s ide s o f wo rki ng s i z e , gap gauge s l ie outs ide the z one Hp Figure A.1) Therefore if, Hp but within the zone H a re there fore s ym me tr ic a l (s e e , the y a re s ti l l A.2 Use o f re ference disk gauges T here are two mai n me tho d s wh ich may b e u s e d as a re ference o f the worki ng s i z e o f gap gauge s The two methods are as follows: a) Reference disk gauge method For a GO gap gauge, two reference disk gauges are used The GO gap gauge should pass over the reference disk gauge for a new state GO gap gauge (ref GOf f contact with the reference disk gauge and then released Inertia forces are thus avoided The GO gap gauge should not pass over the reference disk gauge for a wear limits state GO gap gauge (ref GO-U) when this is applied in the same manner described above The NO GO gap gauge should pass over the reference disk gauge for a NO GO gap gauge (ref NO GO) when this is applied in the same manner described above b) Reference disk gauge and gauge block method This method uses a reference disk gauge with a diameter smaller than the working size of the gap both GO and NO GO gap gauges The sum of the sizes of the gauge block(s) and the reference disk gauge shall meet the size requirement of the gauge element of the corresponding reference disk gauge according to Clause The GO gap gauge should pass over the combined width of the gauge block(s) and the reference disk gauge corresponding to the reference disk gauge for a new state GO gap gauge (ref GO-M) in f f with the gauge block(s) and the reference disk gauge and then released Inertia forces are thus avoided The GO gap gauge should not pass over the combined width of the gauge block(s) and the reference disk gauge corresponding to the reference disk gauge for a wear limits state GO gap gauge (ref GOU) when this is applied in the same manner described above The NO GO gap gauge should pass over the combined width of the gauge block(s) and the reference disk gauge corresponding to the reference disk gauge for a NO GO gap gauge (ref NO GO) when this is applied in the same manner described above It is important that the gauging faces of the gap gauge, the gauge block(s) and reference disk gauge M ) i n a ver tic a l d i re c tion, under the worki ng lo ad , a ter h avi ng b e en brought c are u l ly to re s t i n gauge, u s e d i n conj u nc tion with gauge blo cks accord i ng to I S O grade and i s appropri ate to a ver tica l d i re c tion, u nder the worki ng lo ad, a ter havi ng b e en brought c are u l ly to re s t i n contac t (dep end i ng on the me tho d us e d) b e c are fu l ly wip e d cle an b e fore any me a s u rements a re p er forme d For re ference d i s k gauge s , it i s a l s o re com mende d that they shou ld b e gre as e d with a th i n fi l m o f p ara ffi n j el ly and then c a re fu l ly wip e d, without comple tely removi ng the p a ffi n j el ly © ISO 2017 – All rights reserved ISO 93 8-2 : 01 7(E) Annex B (informative) Relation to the GPS matrix model B.1 General For full details about the GPS matrix model, see ISO 14638 T he I S O/GP S M atri x mo del given i n I S O 14 give s an over view o f the I S O/GP S s ys tem o f wh ich th i s c u ment i s a p ar t T he fu nda menta l ru le s o f I S O/GP S given i n I S O 01 app ly to th i s c u ment a nd the de fau lt de ci s ion ru le s given i n I S O 142 -1 apply to s p e ci fic ation s made i n accordance with th i s document, unless otherwise indicated B.2 Information about this document and its use This document provides the most important design and metrological characteristics of reference disk gauges O n ly tho s e de s ign ch arac teri s tics wh ich are critic a l to i nterch ange abi l ity h ave b e en as s igne d re qu i rement va lue s T he me trolo gic a l cha rac teri s tic s are no t s ubj e c t to re qu i rement va lue s as it i s the ph i lo s ophy that the va lue s o f the s e cha rac teri s tic s are matters o f the manu fac tu rer a nd/or u s er H owever, th i s c u ment provide s defi nition o f the me trolo gic a l charac teri s tics metrological characteristics for which the manufacturer states an MPL value and s tate s tho s e B.3 Position in the GPS matrix model T h i s c u ment i s a glob a l GP S s tandard, wh ich i n fluence s the chai n l i n ks F a nd G o f a l l ch n s o f s tandard s i n the genera l GP S matri x mo del , a s graph ic a l ly i l lu s trate d on © ISO 2017 – All rights reserved Table B.1 ISO 93 8-2 : 01 7(E) Table B.1 — Position in the GPS matrix model A B Chain links C D E F G Feature Feature Conformance Measurement Measure- Calibrations and ment and requirements properties indications non-conformequipment ance • • S ymb ol s Size Distance Form Orientation Location Run-out P ro fi le surface texture Areal surface texture Surface imperfections B.4 Related standards The related standards are those of the chains of standards indicated in Table B.1 10 © ISO 2017 – All rights reserved ISO 93 8-2 : 01 7(E) Bibliography [1] ISO 1, Geometrical product specifications (GPS) — Standard reference temperature for the specification o f geometrical and dimensional properties [2] ISO 1302, Geometrical Product Specifications (GPS) — Indication of surface texture in technical product documentation [3] [4] [5] ISO 3650, Geometrical Product Specifications (GPS) — Length standards — Gauge blocks ISO 8015, Geometrical product specifications (GPS) — Fundamentals — Concepts, principles and rules ISO 14253-1:2013, Geometrical product specifications (GPS) — Inspection by measurement [6] [7] o f workpieces and measuring equipment — Part 1: Decision rules for proving formity or noncon formity with specifications ISO 14638, Geometrical product specifications (GPS) — Matrix model ISO 14978:2006, Geometrical product specifications (GPS) — General concepts and requirements for GPS measuring equipment © ISO 2017 – All rights reserved 11 ISO 93 8-2 : 01 7(E) ICS 17.040.10 Price based on 11 pages © ISO 2017 – All rights reserved