1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-20762-5 SANS 10111-2-3:2008Edition 2ISO 2692:2006Edition 2SOUTH AFRICAN NATIONAL STANDARD Geometrical product specifications (GPS) Geometr
4、ical tolerancing Maximum material requirement (MMR), least material requirement (LMR) and reciprocity requirement (RPR) This national standard is the identical implementation of ISO 2692:2006 and is adopted with the permission of the International Organization for Standardization. Published by Stand
5、ards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 10111-2-3:2008 Edition 2 ISO 2692:2006 Edition 2 Table of changes Change No. Date Scope National foreword This Sou
6、th African standard was approved by National Committee StanSA TC 5120.61, Construction standards, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in June 2008. This SANS document supersedes SABS 0111-2-3:1
7、993 (edition 1). Reference numberISO 2692:2006(E)ISO 2006INTERNATIONAL STANDARD ISO2692Second edition2006-12-15Geometrical product specifications (GPS) Geometrical tolerancing Maximum material requirement (MMR), least material requirement (LMR) and reciprocity requirement (RPR) Spcification gomtriqu
8、e des produits (GPS) Tolrancement gomtrique Exigence du maximum de matire (MMR), exigence du minimum de matire (LMR) et exigence de rciprocit (RPR) SANS 10111-2-3:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 2692:2006(E) PDF discla
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13、e requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2006 All rights reservedSANS 10111-2-3:2008This s tandard may only be used and printed by approved subscription and
14、 freemailing clients of the SABS .ISO 2692:2006(E) ISO 2006 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 2 4 Maximum material requirement, MMR and least material requirement, LMR. 5 4.1 General. 5 4.2 Maximum material
15、 requirement, MMR 5 4.3 Least material requirement, LMR 7 5 Reciprocity requirement, RPR. 9 5.1 General. 9 5.2 Reciprocity requirement and maximum material requirement 9 5.3 Reciprocity requirement and least material requirement. 9 Annex A (informative) Examples of tolerancing with , and . 10 Annex
16、B (informative) Concept diagram 29 Annex C (informative) Relation to the GPS matrix model 30 Bibliography . 31 SANS 10111-2-3:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 2692:2006(E) iv ISO 2006 All rights reservedForeword ISO (th
17、e 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 committ
18、ee 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 electrotechn
19、ical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member
20、bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. 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
21、any or all such patent rights. ISO 2692 was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical product specifications and verification. This second edition cancels and replaces the first edition (ISO 2692:1988), which has been technically revised. It also incorporates the Amendm
22、ent ISO 2692:1988/Amd.1:1992. SANS 10111-2-3:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 2692:2006(E) ISO 2006 All rights reserved vIntroduction 0.1 General This International Standard is a Geometrical product specification (GPS)
23、standard and is to be regarded as a general GPS standard (see ISO/TR 14638). It influences the chain links 1, 2 and 3 of the chain of standards on size of linear “features of size” and form, orientation or location of derived features based on “features of size”. For more detailed information of the
24、 relation of this International Standard to the GPS matrix model, see Annex C. This International Standard covers some frequently occurring workpiece functional cases in design and tolerancing. The “maximum material requirement”, MMR, covers “assembleability” and the “least material requirement”, LM
25、R, covers, for example, “minimum wall thickness” of a part. Each requirement (MMR and LMR) combines two independent tolerance requirements into one collective requirement, which more accurately simulates the intended function of the workpiece. In some cases of both MMR and LMR, the “reciprocity requ
26、irement”, RPR, can be added. 0.2 Information about maximum material requirement, MMR The assembly of parts depends on the combined effect of: a) the size (of one or more extracted features of size), and b) the geometrical deviation of the (extracted) features and their derived features, such as the
27、pattern of bolt holes in two flanges and the bolts securing them. The minimum assembly clearance occurs when each of the mating features of size is at its maximum material size (e.g. the largest bolt size and the smallest hole size) and when the geometrical deviations (e.g. the form, orientation and
28、 location deviations) of the features of size and their derived features (median line or median surface) are also at their maximum. Assembly clearance increases to a maximum when the sizes of the assembled features of size are furthest from their maximum material sizes (e.g. the smallest shaft size
29、and the largest hole size) and when the geometrical deviations (e.g. the form, orientation and location deviations) of the features of size and their derived features are zero. It therefore follows that if the sizes of one mating part do not reach their maximum material size, the indicated geometric
30、al tolerance of the features of size and their derived features may be increased without endangering the assembly to the other part. This assembly function is controlled by the maximum material requirement. The collective requirement is indicated on drawings by the symbol . 0.3 Information about lea
31、st material requirement, LMR The least material requirement is designed to control, for example, the minimum wall thickness, thereby preventing breakout (due to pressure in a tube), the maximum width of a series of slots, etc. It is indicated on drawings by the symbol . The least material requiremen
32、t is also characterised by a collective requirement for the size of a feature of size, the geometrical deviation of the feature of size (form deviations) and the location of its derived feature. SANS 10111-2-3:2008This s tandard may only be used and printed by approved subscription and freemailing c
33、lients of the SABS .ISO 2692:2006(E) vi ISO 2006 All rights reserved0.4 Information about reciprocity requirement, RPR The reciprocity requirement is an additional requirement, which may be used together with the maximum material requirement and the least material requirement in cases where it is pe
34、rmitted taking into account the function of the toleranced feature(s) to enlarge the size tolerance when the geometrical deviation on the actual workpiece does not take full advantage of, respectively, the maximum material virtual condition or the least material virtual condition. The reciprocity re
35、quirement is indicated on the drawing by the symbol . 0.5 General information about terminology and figures The terminology and tolerancing concepts in this International Standard have been updated to conform to GPS terminology, notably that in ISO 286-1:1998, ISO 14405:, ISO 14660-1:1999, ISO 14660
36、-2:1999 and ISO/TS 17450-1:2005. SANS 10111-2-3:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .INTERNATIONAL STANDARD ISO 2692:2006(E) ISO 2006 All rights reserved 1Geometrical product specifications (GPS) Geometrical tolerancing Maximum
37、 material requirement (MMR), least material requirement (LMR) and reciprocity requirement (RPR) 1 Scope This International Standard defines the maximum material requirement, the least material requirement and the reciprocity requirement, and specifies their applications. These requirements are used
38、to control specific functions of workpieces where size and geometry are interdependent, e.g. to fulfil the functions “assembly of parts” (for maximum material requirement) and “minimum wall thickness” (for least material requirement). However, the maximum material requirement and least material requ
39、irement are also used to fulfil other functional design requirements. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced d
40、ocument (including any amendments) applies. ISO 286-1:1988, ISO system of limits and fits Part 1: Bases of tolerances, deviations and fits ISO 1101:2004, Geometrical Product Specifications (GPS) Geometrical tolerancing Tolerances of form, orientation, location and run-out ISO 5459:1), Geometrical pr
41、oduct specifications (GPS) Geometrical tolerancing Datums and datum-systems ISO 14405:2), Geometrical Product Specifications (GPS) Dimensional tolerancing Linear sizes ISO 14660-1:1999, Geometrical Product Specifications (GPS) Geometrical features Part 1: General terms and definitions ISO 14660-2:19
42、99, Geometrical Product Specifications (GPS) Geometrical features Part 2: Extracted median line of a cylinder and a cone, extracted median surface, local size of an extracted feature ISO/TS 17450-1:2005, Geometrical Product Specifications (GPS) General concepts Part 1: Model for geometrical specific
43、ation and verification 1) To be published. (Revision of ISO 5459:1981) 2) To be published. SANS 10111-2-3:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 2692:2006(E) 2 ISO 2006 All rights reserved3 Terms and definitions For the purpo
44、ses of this document, the terms and definitions given in ISO 286-1:1998, ISO 14405:, ISO 14660-1:1999, ISO 14660-2:1999, ISO/TS 17450-1:2005 and the following apply. 3.1 feature of size geometrical shape defined by a linear or angular dimension which is a size ISO 14660-1:1999 3.2 derived feature ce
45、ntrepoint, median line or median surface from one or more integral features ISO 14660-1:1999 3.3 integral feature surface or line on a surface NOTE An integral feature is intrinsically defined. ISO 14660-1:1999 3.4 maximum material condition MMC state of the considered extracted feature, where the f
46、eature of size is at that limit of size where the material of the feature is at its maximum everywhere, e.g. minimum hole diameter and maximum shaft diameter NOTE 1 The term maximum material condition, MMC, is used in this International Standard to indicate, at ideal or nominal feature level (see IS
47、O/TS 17450-1 and ISO 14660-1 respectively), which upper or lower limit of the requirement is concerned. NOTE 2 The size of the extracted feature at maximum material condition, MMC, can be defined by default, or by several special definitions of the size of the extracted feature (see ISO 14405 and IS
48、O 14660-2). NOTE 3 The maximum material condition, MMC, as defined in this International Standard, can be used unambiguously with any definition of size of the extracted feature. 3.5 maximum material size MMS lMMSdimension defining the maximum material condition of a feature See Annex A. NOTE 1 Maxi
49、mum material size, MMS, can be defined by default or by one of several special definitions of the size of the extracted feature (see ISO 14405 and ISO 14660-2). NOTE 2 In this International Standard, maximum material size, MMS is used as a numerical value, therefore no specific definition of the extracted size is needed to permit unambiguous use of maximum material size, MMS. 3.6 least material condition LMC state of the considered extracted feature, where the feature of size is
