1、 STD-BSI BS EN IS0 5458-ENGL 1777 I lb24bb7 0775332 580 I BRITISH STANDARD Geometrical Product Specifications (GPS) - Geometrical tolerancing - Positional t olerancing The European Standasd EN IS0 54581998 has the status of a British Standard ICs 17.040.01 BS EN IS0 5458:1999 NO COPYING WITHOUT BSI
2、PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW STD.BSI BS EN IS0 5458-ENGL 1999 Lb2qbbS 0775333 417 W direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 May 1999 Amd. No. BS EN IS0 64581999 Date Text affected Natio
3、nal foreword This British Standard is the English language version of EN IS0 “98. It is identical with Is0 5458 1%8. It pastially supersedes BS 3083: 1990 which is expected to be finally withdrawn on 2-WO. The UK participation in its preparation was enbusted to Technical Committee TDW4, Engineering
4、drawing, metrology, precision measurement and all related documentation, which has the responsibility to: - aid enquires to understand the text; - present to the responsible internationaVEuropean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests inform
5、ed; - monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in
6、 this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index“, or by using the “Find“ facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necescary provisions of a contract.
7、Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN IS0 title page, the EN IS0 foreword page, the
8、IS0 title page, pages ii and iu, a biank page, pages 1 to 11 and a back cover. O BSI 05-1999 ISBN O 580 32487 7 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS0 5458 December 1998 ICs 01.1 00.01 English version Geometrical product specifications (GPS) - Geometrical tolerancing - Positional t
9、olerancing (IS0 5458:1998) Spcification gWn6tnque des produits (GPS) - Tolrancement gbombtrique - Tolbrancement de localisation (IS0 5458:1998) Geometrische Produktspezifikation (GPS) - Form- und Lagetoierierung Positionstolerierung (IS0 5458:1998) This European Standard was approved by CEN on 15 De
10、cember 1998. CEN members are bound to comply with the CEWCENELEC Intemal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be ob
11、tained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official 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 Central Se
12、cretariat has the same status as the officiai versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland. Ireland, Italy. Luxembourg, Netherlands. Noway, Portugal. Spain, Sweden, Switzerland and United Kingdom. EURO
13、PEAN COMMITEE FOR STANDARDIZAnON COMITE EUROPEEN DE NORMALISATION EUROPAISCHES KOMITEE FUR NORMUNG Central Secretariat: rue de Stassart. 36 8-1050 Brussels 0 1998 CEN All rights of exploitation in any fom and by any means reserved worldwide for CEN national Members. Ref. No. EN IS0 5458:1998 E Forew
14、ord The text of the International Standard IS0 5458:1998 has been prepared by Technical Committee ISORC 21 3 “Dimensional and geometrical product specification and verification in collaboration with Technical Committee CENTTC 290 “Dimensional and geometrical product specification and verification“,
15、the secretariat of which is held by DIN. 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 June 1999, and conflicting national standards shall be withdrawn at the latest by June 1999. According to t
16、he CENICENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain,
17、Sweden, Switzerland and the United Kingdom. The annexes A, BI C and D of this European Standard are informative only. Endorsement notice The text of the International Standard IS0 5458:1998 has been approved by CEN as a European Standard without any modification. - STDmBSI BS EN IS0 5458-ENGL 1999 W
18、 lb24bb9 077533b L2b EN IS0 5458:1998 INTERNATIONAL STANDARD IS0 5458 Second edition 1998-1 2-1 5 Geometrical Product Specif ications (GPS) - Geometrical tolerancing - Positional tolerancing Spcification gomtrique des produits (GPS) - Tolrancement gomtrique - Tolrancement de localisation Reference n
19、umber IS0 5458: 1998(E) EN IS0 5458:1998 Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member b
20、ody 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 pari in the work. IS0 collaborates closely with the International Electro
21、technical Commission (IEC) on all matters of electrotechnical standardization. Drat International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a v
22、ote. International Standard IS0 5458 was prepared by Technical Committee ISO/TC 21 3, Dimensional and geometrical product specifications and verification. This second edition cancels and replaces the first edition (IS0 5458:1987), which has been technically revised. Annexes A, 6, C and D of this Int
23、ernational Standard are for information only. Dsscriptors: drawings, technical drawings, dimensioning, geometrical tolerances, tolerances of position. i STD-BSI BS EN IS0 5458-ENGL 1777 Lb24bb7 0775338 TT9 m EN IS0 5458:1998 Introduction This International Standard is a geometrical product specifica
24、tion (GPS) standard and is to be regarded as a general GPS standard (see ISO/TR 14638). It influences chain links 1 and 2 of the chain of standards on location. For more detailed information of the relation of this standard to the GPS matrix model, see annex C. This International Standard is intende
25、d to promote the relationship between the designer and the manufacturer. The concept of positional tolerancing, as described in IS0 1101, is further elaborated in this International Standard. The figures in this International Standard serve to illustrate the subject matter only and are not necessari
26、ly complete. Other relevant International Standards, such as those dealing with the maximum material requirement (IS0 2692), datums and datum systems (IS0 5459). should be taken into consideration when using this International Standard. For the purposes of this International Standard, all dimensions
27、 and tolerances on the drawings have been shown in vertical lettering. It should be understood that these indications could just as well be written in free-hand or inclined (italic) lettering without altering the meaning of the indications. For the presentation of lettering (proportions and dimensio
28、ns), see IS0 3098-1. iii STD.BS1 BS EN IS0 5458-ENGL 1999 Lb24bb9 0775339 935 EN IS0 5458:1998 Geometrical Product Specifications (GPS) - Geometrical tolerancing - Positional tolerancing 1 Scope This International Standard describes positional tolerancing. This tolerancing method is applied to the l
29、ocation of a point, of a line nominally straight and of a surface nominally plane, e.g. the centre of a sphere, the axis of a hole or shaft and the median surface of a slot. NOTE see IS0 1660. Profile tolerancing is used when lines are not intended to be straight or surfaces are not intended to lie
30、in a plane; 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements base
31、d on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IC0 1 1 O1 :-l), Geometrical Product Specifications (GPS) - Geomet
32、rical tolerancing - Generalities, definitions, symbols, indication on drawings. 3 Definitions Definitions related to features are under development and will be issued as IS0 14660-1. This work will result in new terms that are different from those used in this International Standard. These new terms
33、 are defined in annex A and appear in the main body of this International Standard in parentheses next to the currently used term . 4 Establishment of positional tolerances 4.1 General The primary constituents are theoretically exact dimensions, tolerance zones and datums. 4.2 Fundamental requiremen
34、t Positional tolerances are associated with theoretically exact dimensions and define the limits for the location of actual (extracted) features, such as points, axes, median surfaces, nominally straight lines and nominally plane surfaces relative to each other or in relation to one or more datums.
35、The tolerance zone is symmetrically disposed about the theoretically exact location. )To be published. (Revision of IS0 1101:1983) 1 STD-BSI BS EN I.SO 5458-ENGL 1797 W Lb24bb9 0775340 b57 EN IS0 6468:1998 NOTE Positional tolerances do not accumulate when theoretically exact dimensions are arranged
36、in a chain (see figure 4). (This contrasts with dimensional tolerances that are arranged in a chain.) Positional tolerancing allows clear reference to be made to one or more datums. 4.3 Theoretically exact dimensions Theoretically exact dimensions, both angular and linear, are indicated by being enc
37、losed in a rectangular frame in accordance with IS0 1101. This is illustrated in figures 2 a), 2 b), 3 a), 4 a), 5 a) and 7 a). The theoretically exact dimensions O“ and go“, 180“ or distance O between - positionally toleranced features not related to a datum see figure 4 a) and figure 5 a), - posit
38、ionally toleranced features related to the same datum(s) see figure 2 a), - positionally toleranced features and their related datums (see figure l), are implied without specific indication. When the positional tolerance features share the same centreline or axis they are regarded as theoretically e
39、xactly related features, unless otherwise specified, e.g. in relation to different datums or other reason indicated by an appropriate note on the drawing as shown in figure 2 b). Indication on the drawing Explanation Cases a), b), c) or d) may apply at each individual hole: a) b) c) d) axis of hole
40、coincident with theoretically exact location (zero deviation); axis of hole at maximum position deviation with zero perpendicularity deviation; axis of hole at maximum position deviation with maximum perpendicularity deviation; axis of hole at maximum position deviation; in this case a combination o
41、f geometrical deviations. Figure 1 2 STD.BSI BS EN IS0 5V58-ENGL 1777 Lb2Libb7 0775341, 593 EN IS0 5458:1998 4.4 Positional tolerances on a complete circle When positionally toleranced features are arranged in a complete circle it is understood that the features are equally spaced, unless otherwise
42、stated, and that their locations are theoretically exact. If two or more groups of features are shown on the same axis, they shall be considered to be a single pattern when - they are not related to a datum; - they are related to the same datum or datum system (datums in the same order of precedence
43、 or under the same material conditions) see figure 2 a); unless otherwise stated see figure 2 b). Figure 2 a) 6x015 Angular location optional Figure 2 b) 3 EN IS0 5458:1998 4.5 Directions of positional tolerances 4.5.1 Positional tolerances in one direction only The tolerance value can be specified
44、in one direction. The orientation of the width of the tolerance zone is based on the pattern of the theoretically exact dimensions and is at O“ or 90“ as indicated by the direction of the arrow line see figures 3 a) and 3 b) unless otherwise indicated. Indication on the drawing o12345 I Figure 3 a)
45、Explanation I Key 1 Simulated datum A 2 Simulated datum B Each of the scale lines shall be contained within a tolerance zone defined by two parallel straight lines 0,l apart which are symmetrically disposed about the theoretically exact position of each scale line relative to each other. Figure 3 b)
46、 I 4 STD.BSI BS EN IS0 5458-ENGL 1777 Lb24bb7 07753Li3 3bb EN IS0 5458:1998 4.5.2 Positional tolerances in two directions The tolerance value can be specified in two directions perpendicular to each other, reference being made to unequal values see figures 4 a) and 4 b) or equal values. Figure 4 a)
47、Explanation F 0.3 I L, Figure 4 b) The rectangular pattern consisting of the eight tolerance zones, placed 30 mm apart from each other, is a floating one, the location and orientation of which depends on the considered actual (extracted) features of the workpiece. Each of the holes shall be: - measu
48、red in the direction of the theoretically exact dimension 30; its actual (extracted) median surface lies within a tolerance zone with a rectangular cross section 0,3 x actual length of the feature; - measured in the direction of the theoretically exact dimension 28; its actual (extracted) median sur
49、face lies within a tolerance zone with a rectangular cross section 0,l x actual length of the feature; - the median planes of the tolerance zones are fixed by theoretically exact dimensions. 5 EN IS0 5468:1998 4.5.3 Multi-directional positional tolerances The tolerance is specified as a cylindrical zone see figures 5 a) and 5 b). The “rigid rectangular pattern“ consisting of the eight tolerance zones, placed 30 mm apart from each other, may be implied by a best fit (rotations and translations) to the centre poinffline data from the actual (extracted) feat
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