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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN ISO 14660-2:2000 Th
2、e European Standard EN ISO 14660-2:1999 has the status of a British Standard ICS 01.040.17; 17.040.01 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Geometrical Product Specifications (GPS) Geometrical features Part 2: Extracted median line of a cylinder and a cone, extracted
3、 median surface, local size of an extracted feature Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:13:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Consumer Products and Services Sector Committee, was published under t
4、he authority of the Standards Committee and comes into effect on 15 July 2000 BSI 07-2000 ISBN 0 580 36234 5 BS EN ISO 14660-2:2000 Amendments issued since publication Amd. No.DateComments National foreword This British Standard is the official English language version of EN ISO 14660-2:1999. It is
5、identical with ISO 14660-2:1999. This standard, together with BS 8888 and other implemented European and International Standards listed in annexes A and B of BS 8888, supersedes all parts of BS 308 which are withdrawn. The European and International Standards that were implemented to form subsection
6、s of Part 3 of BS 308 and were dual numbered, are now listed by the implementation number only, e.g. BS EN ISO xxxx. The pocket guide previously available is currently under review. The UK participation in its preparation was entrusted to Technical Committee TDW/4, Engineering drawing, metrology, pr
7、ecision measurement and all related documentation, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related inte
8、rnational 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 Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative referen
9、ces to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the Fi
10、nd facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal
11、 obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii and iii, a blank page, pages 1 to 9 and a back cover. The BSI copyright notice displayed in this document indicates when the docu
12、ment was last issued. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:13:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:13:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 14660-2:1999 Licensed Copy: sheffieldun sheffieldun, na,
13、Wed Nov 15 05:13:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI A Reference number ISO 14660-2:1999(E) INTERNATIONAL STANDARD ISO 14660-2 First edition 1999-10-01 Geometrical Product Specifications (GPS) Geometrical features Part 2: Extracted median line of a cylinder and a cone, extracted median sur
14、face, local size of an extracted feature Spcification gomtrique des produits (GPS) lments gomtriques Partie 2: Ligne mdiane extraite dun cylindre et dun cne, surface mdiane extraite, taille locale dun lment extrait EN ISO 14660-2:1999 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:13:06 G
15、MT+00:00 2006, Uncontrolled Copy, (c) BSI ii 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 committees. Each memb
16、er 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 Ele
17、ctrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for votin
18、g. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 14660-2 was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical product specifications and verification. ISO 14660 consists of the follow
19、ing parts, under the general title Geometrical product specifications (GPS) Geometrical features: Part 1: General terms and definitions Part 2: Extracted median line of a cylinder and a cone, extracted median surface, local size of an extracted feature Annex A of this part of ISO 14660 is for inform
20、ation only. EN ISO 14660-2:1999 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:13:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iii Introduction This part of ISO 14660 is a geometrical product specification (GPS) standard and is to be regarded as a general GPS standard (see ISO/TR 14638).
21、 It influences chain link 3 of the Size, Form of line Derived feature, Form of surface Derived feature, Orientation Derived feature and Location Derived feature chains of standards in the general GPS matrix. For more detailed information on the relation of this part of ISO 14660 to other standards a
22、nd the GPS matrix model, see annex A. Geometrical features exist in three “worlds”: the world of specification, where several representations of the future workpiece are imagined by the designer; the world of the workpiece, the physical world; the world of inspection, where a representation of a giv
23、en workpiece is used through sampling of the workpiece by measuring instruments. It is important to understand the relationship between these three worlds. ISO 14660 defines standardized terminology for geometrical features in each world as well as standardized terminology for the relationship and c
24、ommunication between each world. This part of ISO 14660 is part 2 of a series of standards under preparation dealing with geometrical feature definitions. Extracted features are not geometrical perfect and need further detailed definitions compared to the corresponding nominal features to be unambig
25、uous defined and correctly understood. It is the intention that the same detailed definition of an extracted feature is valid in all chains of standards where the feature or characteristic is used. Therefore the definitions given in this part of ISO 14660 are in force wherever they apply in the gene
26、ral GPS matrix. For the purposes of this part of ISO 14660, the following line types have been used in the illustrations: Feature type Line type extracted surface extracted line (integral features) wide dotted line extracted median surface extracted median line (derived features) narrow dotted line
27、associated plane of a extracted (integral) surface associated line in a extracted (integral) surface wide dashed dotted line associated median plane, associated axis (derived features) narrow dashed dotted line real surface (outline) continuous wide line nominal features (technical drawings in illus
28、trations) in accordance with ISO 128-24 EN ISO 14660-2:1999 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:13:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 14660-2:1999 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:13:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 1 Geom
29、etrical 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 1 Scope This part of ISO 14660 defines a number of extracted features of workpieces. It specifies conditions for default defi
30、nitions, i.e. when no other definitions are specified on the drawing by an extended feature indication. This part of ISO 14660 does not give further definitions, for the extracted feature in question, which would require extended drawing indications. 2 Normative reference The following normative doc
31、ument contains provisions which, through reference in this text, constitute provisions of this part of ISO 14660. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of ISO 14660 are encouraged to
32、investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 14660-1:1999,
33、 Geometrical product specifications (GPS) Geometrical features Part 1: General terms and definitions. 3 Terms and definitions For the purposes of this part of ISO 14660, the terms and definitions given in ISO 14660-1 and the following apply. 3.1 default definition (of an extracted feature) detailed
34、supplementary definition, selected by convention, of the extracted feature concerned, which is applicable only by using the basic ISO tolerance indication on the drawing or in other technical documents NOTE 1 The basic ISO tolerance indications are those given in, for example, ISO 286-1, ISO 1101 an
35、d ISO 1302. NOTE 2 The default definition (of an extracted feature) can be changed to a special definition by adding an extension to the basic ISO tolerance indication. Such extensions are under development. EN ISO 14660-2:1999 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:13:06 GMT+00:0
36、0 2006, Uncontrolled Copy, (c) BSI 2 3.2 extracted median line of a cylinder locus of centres of cross-sections, where the centres of cross-sections are centres of associated circles; and the cross-sections are perpendicular to the axis of the associated cylinder obtained from the extracted surface
37、(i.e. the radius could be different from the nominal radius) 3.3 extracted median line of a cone locus of centres of cross-sections, where the centres of cross-sections are centres of associated circles; and the cross-sections are perpendicular to the axis of the associated cone obtained from the ex
38、tracted surface (i.e. the angle could be different from the nominal angle) 3.4 extracted median surface locus of centrepoints between sets of opposite points of the opposite extracted surfaces, where the connecting lines of sets of opposite points are perpendicular to the associated median plane; an
39、d the associated median plane is the median plane of two associated parallel planes obtained from the extracted surfaces (i.e. the distance between the two associated parallel planes could be different from the nominal distance) 3.5 local size of an extracted cylinder local diameter of an extracted
40、cylinder distance between two opposite points on the feature, where the connection line between the points includes the associated circle centre; and the cross-sections are perpendicular to the axis of the associated cylinder obtained from the extracted surface 3.6 local size of two parallel extract
41、ed surfaces distance between two points on opposite extracted surfaces, where the connecting lines of sets of opposite points are perpendicular to the associated median plane; and the associated median plane is the median plane of two associated parallel planes obtained from the extracted surfaces (
42、i.e. the distance between the two associated parallel planes could be different from the nominal distance) 4 Default definition conditions 4.1 Extracted derived features 4.1.1 Extracted median line of a cylinder For the default definition (unless otherwise specified) of the extracted median line of
43、a cylinder, the following conditions apply: the associated circles are the total least squares circles (see Figure 1); the associated cylinder is the total least squares cylinder (see Figure 1). EN ISO 14660-2:1999 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:13:06 GMT+00:00 2006, Uncon
44、trolled Copy, (c) BSI 3 Key 1 Extracted surface 2 Associated cylinder 3 Associated cylinder axis 4 Extracted median line 5 Associated circle 6 Associated circle centre 7 Associated cylinder axis 8 Associated cylinder 9 Extracted line Figure 1 Extracted median line of a cylinder EN ISO 14660-2:1999 L
45、icensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:13:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 4.1.2 Extracted median line of a cone For the default definition (unless otherwise specified) of the extracted median line of a cone, the following conditions apply: the associated circles are
46、 the total least squares circles (see Figure 2); the associated cone is the total least squares cone (see Figure 2). Key 1 Associated cone 2 Extracted surface 3 Associated axis 4 Extracted median line 5 Associated circle 6 Associated circle centre 7 Associated cone axis 8 Associated cone 9 Extracted
47、 line Figure 2 Extracted median line of a cone EN ISO 14660-2:1999 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:13:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 5 4.1.3 Extracted median surface For the default definition (unless otherwise specified) of the extracted median surface, the
48、following condition applies: the two associated parallel planes are obtained by the total least squares method (see Figure 3). Key 1 Extracted surface 2 Associated plane 3 Associated median plane 4 Extracted median surface 5 Extracted surface Figure 3 Extracted median surface EN ISO 14660-2:1999 Lic
49、ensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 05:13:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 6 4.2 Local size of extracted features 4.2.1 Local size of an extracted cylinder (local diameter of an extracted cylinder) For the default definition (unless otherwise specified) of the local diameter of an extracted cylinder (of a cross- section), the following conditions apply: the associated circle is the total least squares circle (see Figure 4); the associated cyl