SANS 10111-2-2-1993 Engineering drawing Part 2 Geometrical tolerancing Section 2 Datums and datum-systems for geometrical tolerances《工程制图 第2部分 几何公差 第2节 几何公差基准数及基准系统》.pdf

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. SABS0111-2*ICS 01.100.20; 21.020ISBN 0-626-09405-4*This standard references other standardsEdition 11993SOUTH AFRICAN STANDARDCode of practiceEngineering

4、 drawingSABS 0111-2Part 2: Geometrical tolerancing(Equivalent to ISO 1101:1983, ISO 5459:1981,ISO 2692:1988, ISO 5458:1987 andISO 8015:1985)Published byTHE SOUTH AFRICAN BUREAU OF STANDARDSGr 16Please note that SANS 10111-2-1:1993, SANS 10111-2-3:1993, SANS 10111-2-4:1993 and SANS 10111-2-5:1993 are

5、 no longer applicable and have been superseded by SANS 10111-2-1:2007 (edition 2.0), SANS 10111-2-3:2008 (edition 2.0), SANS 10111-2-4:2005 (edition 2.0) and SANS 10111-2-5:1993 (edition 1.0 amended to change the designation from SABS to SANS, with no technical changes) respectively, published separ

6、ately. Only section 2 of this publication is still current. This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .SABS 0111-2Ed. 1This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ICS 01.100.2

7、0; 21.020 SABS 0111-2Ed. 1SOUTH AFRICAN BUREAU OF STANDARDSCODE OF PRACTICEENGINEERING DRAWINGPART 2: GEOMETRICAL TOLERANCING(Equivalent to ISO 1101:1983, ISO 5459:1981, ISO 2692:1988,ISO 5458:1987 and ISO 8015:1985)Obtainable from theSouth African Bureau of StandardsPrivate Bag X191PretoriaRepublic

8、 of South Africa0001Telephone : (012) 428-7911Fax : (012) 344-1568E-mail : salessabs.co.zaWebsite : http:/www.sabs.co.zaCOPYRIGHT RESERVEDPrinted in the Republic of South Africa by theSouth African Bureau of StandardsThis s tandard may only be used and printed by approved subscription and freemailin

9、g clients of the SABS .SABS 0111-2Ed. 1iiNoticeThis part of SABS 0111 was approved in accordance with SABS procedures on 12 May 1993.NOTE 1 In terms of the Standards Act, 1993 (Act 29 of 1993), no person shall claim or declare that he or any other personcomplied with a standard unlessa) such claim o

10、r declaration is true and accurate in all material respects, andb) the identity of the person on whose authority such claim or declaration is made, is clear.NOTE 2 It is recommended that authorities who wish to incorporate any part of this part of SABS 0111 into any legislationin the manner intended

11、 by section 31 of the Act consult the SABS regarding the implications.This part of SABS 0111 will be revised when necessary in order to keep abreast of progress. Commentwill be welcome and will be considered when this part of SABS 0111 is revised.ForewordThe technical committee responsible for this

12、part of SABS 0111 accepted the texts of ISO 1101:1983,Technical drawings - Geometrical tolerancing - Tolerancing of form, orientation, location and run-out -Generalities, definitions, symbols, indications on drawings, ISO 5459:1981, Technical drawings -Geometrical tolerancing - Datums and datum-syst

13、ems for geometrical tolerances, ISO 2692:1988,Technical drawings - Geometrical tolerancing - Maximum material principle, ISO 5458:1987, Technicaldrawings - Geometrical tolerancing - Positional tolerancing, and ISO 8015:1985, Technical drawings -Fundamental tolerancing principle, as suitable for publ

14、ication, without technical modification and with verylimited language editing, as a South African standard, with the addition of cover, title, notice andcommittee list pages.Since each of these ISO standards has been adopted as a section of this part of SABS 0111, thenumbering of the clauses, subcla

15、uses and figures of each ISO standard has been preceded by therelevant section number of this part of SABS 0111.Where the words “International Standard“ appear, referring to this part of SABS 0111, they should beinterpreted as “part of SABS 0111“.SABS 0111 consists of the following parts under the g

16、eneral title Engineering drawing:Part 1 - General principles.Part 2 - Geometrical tolerancing.SABS 0111-2, in turn, consists of the following sections:- Section 1 - Tolerancing of form, orientation, location and run-out - Generalities, definitions, symbols,indications on drawings (equivalent to ISO

17、1101:1983).- Section 2 - Datums and datum-systems for geometrical tolerances (equivalent to ISO 5459:1981).- Section 3 - Maximum and least material principles (equivalent to ISO 2692:1988).- Section 4 - Positional tolerancing (equivalent to ISO 5458:1987).- Section 5 - Fundamental tolerancing princi

18、ple (equivalent to ISO 8015:1985).Attention is drawn to the references given in clauses 1.2,2.2, 3.2, 4.2 and 5.3 of this standard. These references areindispensable for the application of this standard.ISBN 0-626-09405-4This s tandard may only be used and printed by approved subscription and freema

19、iling clients of the SABS .SABS 0111-2Ed. 1iiiContentsPage Notice . iiForeword iiCommittee . viSECTION 1: Tolerancing of form, orientation, location and run-out -Generalities, definitions, symbols, indications on drawings(Equivalent to ISO 1101:1983)1.0 Introduction . 11.1 Scope and field of applica

20、tion . 11.2 References . 11.3 General 11.4 Symbols 31.5 Tolerance frame . 41.6 Toleranced features 51.7 Tolerance zones . 61.8 Datums 71.9 Restrictive specifications. 91.10 Theoretically exact dimensions 101.11 Projected tolerance zone 101.12 Maximum material condition 101.13 Definitions of toleranc

21、es . 111.14 Detailed definitions of tolerances 121.14.1 Straightness tolerance . 121.14.2 Flatness tolerance 121.14.3 Circularity tolerance . 131.14.4 Cylindricity tolerance 131.14.5 Profile tolerance of any line . 131.14.6 Profile tolerance of any surface 131.14.7 Parallelism tolerance 141.14.8 Per

22、pendicularity tolerance 171.14.9 Angularity tolerance . 181.14.10 Positional tolerance . 191.14.11 Concentricity and coaxiality tolerance . 211.14.12 Symmetry tolerance . 211.14.13 Circular run-out tolerance. 221.14.14 Total run-out tolerance . 24SECTION 2: Datums and datum-systems for geometricalto

23、lerances (Equivalent to ISO 5459:1981)2.0 Introduction . 252.1 Scope and field of application . 252.2 References . 252.3 Definitions 252.4 Establishing datums 262.5 Application of datums . 282.6 Indication of datums and datum-systems 312.7 Datum targets . 342.8 Three-plane datum-system . 392.9 Group

24、s of features nominated as datums 40This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .SABS 0111-2Ed. 1ivBlankThis s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .Ed . 1 Contents Page SECTION

25、3: Maximum and least material principles (Equivalent to IS0 2692:1988) Introduction Scope and field of application References Definitions : Maximum material principle . Appijcation of the maximum material principle Examples of application where applies to the toleranced feature(s) . . . Zero geometr

26、ical tolerancing Examples of application where applies to the toleranced feature) and the datum feature . Least material requirement (LMR) SECTION 4: Positional tolerancing (Equivalent to IS0 5458:1987) Introduction Scope and field of application References Establishment of positional tolerances . T

27、olerance combinations Calculation of positional tolerances SECTION 5: Fundamental tolerancing principle (Equivalent to IS0 8015:1985) Scope . Field of application References Principle of independency . Tolerances Mutual dependency of size and geometry Application on drawings . This s tandard may onl

28、y be used and printed by approved subscription and freemailing clients of the SABS .SABS 0111-2Ed. 1viCommitteeSouth African Bureau of Standards . BP Brimelow(Chairman)CB Shore(Standards writer)DL Fabricius(Committee clerk)Armscor Limited HPJ Jansen vanNieuwenhuizenKentron. FJ LawrenceSimeraDivision

29、 of Denel (Pty) Ltd . GR GldenpfennigThis s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .1CODE OF PRACTICE SABS 0111-2-1Edition 1Engineering drawingPart 2:Geometrical tolerancingSection 1: Tolerancing of form, orientation, location and run-out Ge

30、neralities, definitions,symbols, indications on drawings(Equivalent to ISO 1101:1983, Technical drawings - Geometrical tolerancing - Tolerancing of form,orientation, location and run-out - Generalities, definitions, symbols, indications on drawings)1.0 IntroductionFor uniformity, all figures in this

31、 International Standard are in first angle projection.It should be understood that the third angle projection could equally well have been used without prejudice to the principles established.For the definitive presentation (proportions and dimensions) of symbols for geometrical tolerancing, see ISO

32、 7083.1.1 Scope and field of application1.1.1 This International Standard gives the principles of symbolization and indication on technical drawings of tolerances of form,orientation, location and run-out, and establishes the appropriate geometrical definitions. Hence the term “geometrical tolerance

33、s“ will beused in this document as synonymous with these groups of tolerances.1.1.2 Geometrical tolerances shall be specified only where they are essential, that is, in the light of functional requirements, inter-changeability and probable manufacturing circumstances.1.1.3 Indicating geometrical tol

34、erances does not necessarily imply the use of any particular method of production, measurement orgauging.1.2 ReferencesISO 5459, Technical drawings - Geometric tolerancing - Datums and datum systems for geometrical tolerances.ISO 7083, Technical drawings - Symbols for geometrical tolerancing - Propo

35、rtions and dimensions.1.3 General1.3.1 A geometrical tolerance applied to a feature defines the tolerance zone within which the feature (surface, axis, or median plane) isto be contained (see 1.3.7 to 1.3.8).1.3.2 According to the characteristic which is to be toleranced and the manner in which it i

36、s dimensioned, the tolerance zone is one of thefollowing:- the area within a circle;- the area between two concentric circles;NO LONGER APPLICABLE; superseded by SANS 10111-2-1:2007 (edition 2.0), now published separately. This s tandard may only be used and printed by approved subscription and free

37、mailing clients of the SABS .SABS 01 1 1 -2-1 : 1993 -the area between two equidistant lines or two parallel straight lines; - the space within a cylinder; -the space between two coaxial cylinders; -the space between two equidistant planes or two parallel planes; -the space within a parallelepiped.

38、1.3.3 The toleranced feature may be of any form or orientation within this tolerance zone, unless a more restrictive indication is given, for example by an explanatory note (see figures 1.8 and 1 .g). 1.3.4 Unless otherwise specified as in clauses 1.9 and 1 .l 1, the tolerance applies to the whole l

39、ength of surface of the considered feature. 1.3.5 The datum feature is a real feature of a part, which is used to establish the location of a datum (see IS0 5459). 1.3.6 Geometrical tolerances which are assigned to features related to a datum do not limit the form deviations of the datum feature its

40、elf. The form of a datum feature shall be sufficiently accurate for its purpose and it may therefore Ibe necessary to specify tolerances of form for the datum features. 1.3.7 The straightness or flatness of a single toleranced feature is deerned to be correct when the distance of its individual poin

41、ts from a superimposed surface of ideal geometrical form is equal to or less than the value of the specified tolerance. The orientation of the ideal line or surface shall be so chosen that the maximum distance between it and the actual surface of the feature concerned is the least possible value. Ex

42、ample: % Figure 1 .l Possible orientations of the line or surface: A1 - B1 A2 - B2 *3 - B3 Corresponding distances: “1 “2 “3 In the case of figure 1 .l : “1 “2 “3 Therefore the correct orientation of the ideal line or surface is AI - B,. The distance hi is to be equal to or less than the specified t

43、olerance. 1.3.8 For the definition of circularity and cylindricity, the location of the two concentric cylinders or coaxial cylinders shall be so chosen that the radial distance between them is the minimum. Example: Figure 1 .:! NO LONGER APPLICABLE; superseded by SANS 10111-2-1:2007 (edition 2.0),

44、now published separately. This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .SABS 01 11-2-1 :l993 Possible location of the centres of the two concentric circles or the axes of the two coaxial cylinders and their minimal radial distances. Centre

45、C1) of A, locates two concentric circles or two coaxial cylinders. Centre (Cp) of A2 locates two concentric circles or two coaxial cyiinders with minimal radial distance. Corresponding radial distances: Ar, Ar2 In the case of figure 1.2: A c Arl Therefore the correct location of the two concentric

46、circles or the two coaxial cylinders is the one designated A2 The radial distance Ar2 should then be equal to or less than the specified tolerance. 1.4 Symbols Table 1.1 - Symbols for toleranced characteristics I Features and tolerances Form tolerances Orientation tolerances Location tolerances Run-

47、out tolerances 3 4 5 Toleranced characteristics Symbols Subclauses itraightness rofile of any line I n I 1 .l4.5 Profile of any surface I 1.14.6 Parallelism Perpendicularity 1 .14.8 Angularity L 1.14.9 Position Concentricity and coaxiality I0 l Circular run-out NO LONGER APPLICABLE; superseded by SA

48、NS 10111-2-1:2007 (edition 2.0), now published separately. This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .SABS 01 11 -2-1 :l 993 Table 1.2 - Additional symbols I I I Descriptions I Symbols I Clauses direct Toleranced feature ndications by le

49、tter 1.7.4 m Datum indications 1.8 latum target heoretically exact dimension rojected tolerance zone laximum material condition 0 I 1.12 1.5 Tolerance frame 1 S.1 The tolerance requirements are shown in a rectangular frame which is divided into two or more compartments. These compart- ments contain, from left to right, in the following order (see figures 1.3, 1.4 and 1.5): - the symbol for the characteristic to be toleranced; - the tolerance value in the unit used for linear dimensions. This value is preceded by the sign if the tolerance zone is circular or cylindrical; - i