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1、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 surface, local size of an extracted feature Spcification gomtrique
2、 des produits (GPS) lments gomtriques Partie 2: Ligne mdiane extraite dun cylindre et dun cne, surface mdiane extraite, taille locale dun lment extrait Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not f
3、or Resale, 04/22/2007 19:56:10 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 14660-2:1999(E) ISO 1999 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, incl
4、uding photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 CH-1211 Genve 20 Switzerland Internetisoiso.ch Printed in Switzerland ii Foreword ISO (the International Organization for Standardization) is a worldwide
5、 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 committee has been established has the right to be represented on that
6、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 electrotechnical standardization. International Standards are drafted in acc
7、ordance 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 voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Internati
8、onal Standard ISO 14660-2 was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical product specifications and verification. ISO 14660 consists of the following parts, under the general title Geometrical product specifications (GPS) Geometrical features: Part 1: General terms and d
9、efinitions 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 information only. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Tec
10、hnical Standards 1/9972545001 Not for Resale, 04/22/2007 19:56:10 MDTNo reproduction or networking permitted without license from IHS -,-,- ISOISO 14660-2:1999(E) iii Introduction This part of ISO 14660 is a geometrical product specification (GPS) standard and is to be regarded as a general GPS stan
11、dard (see ISO/TR 14638). 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 14
12、660 to other standards and 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
13、 representation of a given 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 fo
14、r the relationship and communication 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 nomina
15、l features to be unambiguous 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 whereve
16、r they apply in the general GPS matrix. For the purposes of this part of ISO 14660, the following line types have been used in the illustrations: Feature typeLine type extracted surface extracted line (integral features) wide dotted line extracted median surface extracted median line (derived featur
17、es) narrow dotted line 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 (techni
18、cal drawings in illustrations)in accordance with ISO 128-24 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 19:56:10 MDTNo reproduction or networking permitted without license fr
19、om IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 19:56:10 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISOISO 1466
20、0-2:1999(E) 1 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 1 Scope This part of ISO 14660 defines a number of extracted features of workpieces. It specifies condition
21、s for default definitions, 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 follo
22、wing normative document 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
23、are encouraged to 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.
24、 ISO 14660-1:1999, 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
25、feature) detailed 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 1The basic ISO tolerance indications are those given in, for example, ISO 2
26、86-1, ISO 1101 and ISO 1302. NOTE 2The 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. Copyright International Organization for Standardization Provided by IHS und
27、er license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 19:56:10 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 14660-2:1999(E) ISO 2 3.2 extracted median line of a cylinder locus of centres of cross-sections, where the centres of
28、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 (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, w
29、here 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 extracted surface (i.e. the angle could be different from the nominal angle) 3.4 extracted median surface locus of centrepoints between
30、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; and the associated median plane is the median plane of two associated parallel planes obtained from the extracted surfaces (i.e. the dis
31、tance 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 cylinder distance between two opposite points on the feature, where the connection line between the points includes the associated cir
32、cle 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 extracted surfaces distance between two points on opposite extracted surfaces, where the connecting lines of sets of opposite points are perp
33、endicular to the associated median plane; and 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) 4 Default definition condit
34、ions 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 a cylinder, the following conditions apply: the associated circles are the total least squares circles (see Figure 1); the associated
35、cylinder is the total least squares cylinder (see Figure 1). Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 19:56:10 MDTNo reproduction or networking permitted without license f
36、rom IHS -,-,- ISOISO 14660-2:1999(E) 3 Key 1Extracted surface 2Associated cylinder 3Associated cylinder axis 4Extracted median line 5Associated circle 6Associated circle centre 7Associated cylinder axis 8Associated cylinder 9Extracted line Figure 1 Extracted median line of a cylinder Copyright Inter
37、national Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 19:56:10 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 14660-2:1999(E) ISO 4 4.1.2 Extracted median line of a con
38、e For the default definition (unless otherwise specified) of the extracted median line of a cone, the following conditions apply: the associated circles are the total least squares circles (see Figure 2); the associated cone is the total least squares cone (see Figure 2). Key 1Associated cone 2Extra
39、cted surface 3Associated axis 4Extracted median line 5Associated circle 6Associated circle centre 7Associated cone axis 8Associated cone 9Extracted line Figure 2 Extracted median line of a cone Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=N
40、ASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 19:56:10 MDTNo reproduction or networking permitted without license from IHS -,-,- ISOISO 14660-2:1999(E) 5 4.1.3 Extracted median surface For the default definition (unless otherwise specified) of the extracted median surface, the foll
41、owing condition applies: the two associated parallel planes are obtained by the total least squares method (see Figure 3). Key 1Extracted surface 2Associated plane 3Associated median plane 4Extracted median surface 5Extracted surface Figure 3 Extracted median surface Copyright International Organiza
42、tion for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 19:56:10 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 14660-2:1999(E) ISO 6 4.2 Local size of extracted features 4.2.1 Local size
43、 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); th
44、e associated cylinder is the total least squares cylinder (see Figure 4). Key 1Extracted surface 2Associated cylinder 3Associated cylinder axis 4Extracted median line 5Extracted line 6Associated circle 7Associated centre 8Local diameter of the extracted feature 9Associated cylinder 10Associated axis
45、 Figure 4 Local size of an extracted cylinder (local diameter of a cylinder) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 19:56:10 MDTNo reproduction or networking permitted w
46、ithout license from IHS -,-,- ISOISO 14660-2:1999(E) 7 4.2.2 Local size of two parallel extracted surfaces For the default definition (unless otherwise specified) of the local size of two parallel extracted surfaces (see Figure 5), the following condition applies: the two associated parallel planes
47、are obtained by the total least squares method. Key 1Extracted surfaces 2Associated median plane 3Local size of two extracted surfaces 4Opposite points Figure 5 Local size of two parallel extracted surfaces Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 19:56:10 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 14660-2:1999(E) ISO 8 Annex A (informative) Relation to the GPS matrix model For full details about the GPS matrix model, see IS
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