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1、 Reference number ISO/TR 16570:2004(E) ISO 2004 TECHNICAL REPORT ISO/TR 16570 First edition 2004-10-01 Geometrical Product Specifications (GPS) Linear and angular dimensioning and tolerancing: +/- limit specifications Step dimensions, distances, angular sizes and radii Spcification gomtrique des pro
2、duits (GPS) Cotation et tolrancement linaires et angulaires: Spcifications de limites en +/- Ressauts, distances, tailles angulaires et rayons Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale
3、, 04/19/2007 03:16:42 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/TR 16570:2004(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typeface
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6、vent that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2004 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocop
7、ying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the 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 Switzer
8、land ii ISO 2004 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 03:16:42 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/TR 165
9、70:2004(E) ISO 2004 All rights reserved iii Contents Page Forewordiv Introduction v 1 Scope1 2 Normative references .1 3 Terms and definitions.1 4 Linear dimensioning.2 5 Angular dimensioning6 6 Tolerances .7 7 Designation10 Annex A (informative) Examples covered by other standards11 Annex B (inform
10、ative) Relation to the GPS matrix model 14 Bibliography .15 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 03:16:42 MDTNo reproduction or networking permitted without license fr
11、om IHS -,-,- ISO/TR 16570:2004(E) iv ISO 2004 All rights reserved Foreword ISO (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
12、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
13、the International Electrotechnical Commission (IEC) on all matters of electrotechnical 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 Interna
14、tional 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 vote. In exceptional circumstances, when a technical committee has collected data of a diffe
15、rent kind from that which is normally published as an International Standard (“state of the art”, for example), it may decide by a simple majority vote of its participating members to publish a Technical Report. A Technical Report is entirely informative in nature and does not have to be reviewed un
16、til the data it provides are considered to be no longer valid or useful. 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 patent rights. ISO/TR 16570 was prepared by
17、 Technical Committee ISO/TC 213, Dimensional and geometrical product specifications and verification. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 03:16:42 MDTNo reproduction
18、or networking permitted without license from IHS -,-,- ISO/TR 16570:2004(E) ISO 2004 All rights reserved v Introduction This Technical Report is a geometrical product specification (GPS) technical report and is to be regarded as a general GPS technical report (see ISO/TR 14638). It influences links
19、1 and 2 of the chains of standards on size, distance, radius and angle. For more detailed information on the relation of this Technical Report to other standards and the GPS matrix model, see Annex B. The application of limit specifications usually causes large specification uncertainty (see ISO/TS
20、17450-2). It must be emphasized that any limit specification in this Technical Report, generally speaking, can be completely substituted by geometrical dimensioning and tolerancing as per ISO 1101 and its related standards. Even the application of this Technical Report might cause large specificatio
21、n uncertainty. Consequently, ISO/TC 213 recommends that the use of limit specifications be restricted to features of size only (see ISO 14660-1 and ISO 14405). Other geometrical specifications are indicated and toleranced according to the principles given in ISO 1101 and related standards (e.g. by p
22、ositional tolerancing). This Technical Report consists of several groups of examples and it needs to be recognized that several different interpretation concepts are applied in the various groups. ISO 129 contains general rules for dimensioning and dimensional tolerancing with limit specifications i
23、n technical drawings. These rules are not always sufficient for an unambiguous description of the workpiece geometry. EXAMPLE 1 Distances between axes of holes on a pitch cylinder cannot be toleranced by limit specifications suitable for the function (see Figure A.1, left). EXAMPLE 2 Angles between
24、planes containing axes of holes cannot be toleranced by limit specifications suitable for the function (see Figures A.3 and A.5). EXAMPLE 3 Linear dimensions and limit specifications, even when related to the same reference (having the same origin as in superimposed running dimensioning), but dimens
25、ioned in two or three directions and nominally perpendicular to each other, are ambiguous (see Figure A.1, centre, right). In certain cases, such as for step dimensions, the function (e.g. assembly) allows for larger tolerances for the form (e.g. flatness) than for the location of the point of the s
26、urface, which is the most outward of the material. In these cases the production process including casting, forging and sheet metal working, becomes more beneficial when limit deviation specifications are applied. For these and similar cases, this Technical Report deals with limit specifications for
27、 step dimensions (see 4.2), distances between an integral feature and a derived feature (see 4.3.1), distances between two derived features (see 4.3.2), angular sizes (see Clause 5), and radii (see 6.4), only when two features are involved. Copyright International Organization for Standardization Pr
28、ovided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 03:16:42 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=N
29、ASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 03:16:42 MDTNo reproduction or networking permitted without license from IHS -,-,- TECHNICAL REPORT ISO/TR 16570:2004(E) ISO 2004 All rights reserved 1 Geometrical Product Specifications (GPS) Linear and angular dimensioning and toleran
30、cing: +/- limit specifications Step dimensions, distances, angular sizes and radii 1 Scope This Technical Report describes the limit specification of step dimensions, distances, angular sizes and radii when the function relates to two features only. The interpretation of limit specifications in acco
31、rdance with this Technical Report is only applicable to a drawing when “ISO/TR 16570” is referred to on the drawing. 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 ref
32、erences, the latest edition of the referenced document (including any amendments) applies. ISO 129-1:2004, Technical drawings Dimensioning General principles, definitions, methods of execution and special indications ISO 1101:1), Geometrical Product Specifications (GPS) Geometrical tolerancing Toler
33、ancing of form, orientation, location and run-out ISO 14660-1, Geometrical Product Specifications (GPS) Geometrical features Part 1: General terms and definitions ISO/TS 17450-1:2), Geometrical product specifications (GPS) Part 1: Model for geometrical specification and verification 3 Terms and defi
34、nitions For the purposes of this document, the terms and definitions given in ISO 129, ISO 1101, ISO 14660-1 and ISO/TS 17450-1 apply. 1) To be published. (Revision of ISO 1101:1983) 2) To be published. Copyright International Organization for Standardization Provided by IHS under license with ISO L
35、icensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 03:16:42 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/TR 16570:2004(E) 2 ISO 2004 All rights reserved 4 Linear dimensioning 4.1 General Linear dimensioning may be applied for tolerancing sizes a
36、nd distances between two ideal features, otherwise the requirements of ISO 1101 apply. 4.2 Distance dimensioning between two parallel planes (step dimensioning) A step dimension is the distance between two parallel planes (integral features) having the same direction outward from the material (see F
37、igure 1). Figure 1 Step dimension One of the two parallel planes is to be taken as the reference. For the purposes of this Technical Report, the step dimension corresponds to the distance between the reference and the contacting associated plane of the other surface parallel to the reference plane (
38、see Figure 2). The reference is a contacting plane so located and orientated that any motion is equalized. 2 1 2 1 5 +0,2 - a) Drawing indication b) Explanation (two reference possibilities) Key 1 contacting associated plane 2 reference plane Figure 2 Step dimension without origin symbol according t
39、o ISO 129 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 03:16:42 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/TR 16570:2004(E) ISO 2004 All rig
40、hts reserved 3 Where the origin symbol indicates a single feature in accordance with ISO 129, this feature applies as the reference feature only (see Figure 3). When there is no reference indicated (dimension line with arrows on both sides) both reference possibilities apply. NOTE 1 Form and orienta
41、tion of the features are controlled by individually indicated geometrical tolerances or general tolerances of form (e.g. flatness) and of orientation (e.g. parallelism, perpendicularity). NOTE 2 This definition of step dimensioning corresponds to the functional requirements of an assembly. NOTE 3 Th
42、is concept of step dimensioning is different from the other concepts of distance dimensioning given in 4.3. 2 1 5 +0,2 - a) Drawing indication b) Explanation Key 1 contacting associated plane 2 reference plane Figure 3 Step dimension with origin symbol according to ISO 129 4.3 Distance dimensioning
43、between two parallel features, at least one of which is derived 4.3.1 Distance between integral feature (plane surface) and derived feature For the distance between an integral feature (plane surface) and a derived feature, see Figure 4. 2 1 Key 1 integral feature 2 derived feature Figure 4 Distance
44、 between integral and derived feature One of the features is to be taken as a reference. For the purposes of this Technical Report, the distances correspond to the range of distances between the reference and the contacting associated feature of the other feature in any section plane perpendicular t
45、o the reference, over the length of the extracted derived feature, or over the length of the extracted plane feature. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 03:16:42 MDT
46、No reproduction or networking permitted without license from IHS -,-,- ISO/TR 16570:2004(E) 4 ISO 2004 All rights reserved The reference is for a cylinder, the axis of the largest inscribed cylinder of a hole or the smallest circumscribed cylinder of a shaft, so located and orientated that any motio
47、n is equalized, or for a plane, a contacting plane located and orientated such that any motion is equalized. For the feature other than the reference, the contacting associated feature has the same definition as for the reference. The lengths of the extracted derived feature and the extracted plane
48、feature are determined by the distance of the contacting associated features from the adjacent surfaces (see Figure 5). AA b a 80 +0,1 - d c A-A A-A 1 1 21 1 1 1 1 1 2 2 1 2 AA a) Drawing indication b) Explanation (two reference possibilities) Key 1 contacting associated feature 2 reference cylinder axis a, b, c, d possible distances between contacting associated feature a