EN ISO 20170:2019

SLOVENSKI STANDARD
01-julij-2019
Specifikacija geometrijskih veličin izdelka (GPS) - Razčlenitev geometrijskih
lastnosti za kontrolo proizvodnje (ISO 20170:2019)
Geometrical product specification (GPS) - Decomposition of geometrical characteristics
for manufacturing control (ISO 20170:2019)
Geometrische Produktspezifikation (GPS) - Zerlegung von geometrischen Merkmalen für
die Fertigungskontrolle (ISO 20170:2019)
Spécification géométrique des produits (GPS) - Décomposition des caractéristiques
géométriques pour le contrôle en fabrication (ISO 20170:2019)
Ta slovenski standard je istoveten z: EN ISO 20170:2019
ICS:
17.040.40 Specifikacija geometrijskih Geometrical Product
veličin izdelka (GPS) Specification (GPS)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 20170
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2019
EUROPÄISCHE NORM
ICS 17.040.01; 17.040.40
English Version
Geometrical product specifications (GPS) - Decomposition
of geometrical characteristics for manufacturing control
(ISO 20170:2019)
Spécification géométrique des produits (GPS) - Geometrische Produktspezifikation (GPS) - Zerlegung
Décomposition des caractéristiques géométriques pour von geometrischen Merkmalen für die
la maîtrise de la fabrication (ISO 20170:2019) Fertigungskontrolle (ISO 20170:2019)
This European Standard was approved by CEN on 19 February 2019.

CEN members are bound to comply with the CEN/CENELEC Internal 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 obtained on application to the CEN-CENELEC Management Centre 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 CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20170:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 20170:2019) has been prepared by Technical Committee ISO/TC 213
"Dimensional and geometrical product specifications and verification" in collaboration with Technical
Committee CEN/TC 290 “Dimensional and geometrical product specification and verification” the
secretariat of which is held by AFNOR.
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 November 2019, and conflicting national standards
shall be withdrawn at the latest by November 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 20170:2019 has been approved by CEN as EN ISO 20170:2019 without any modification.

INTERNATIONAL ISO
STANDARD 20170
First edition
2019-04
Geometrical product specifications
(GPS) — Decomposition of
geometrical characteristics for
manufacturing control
Spécification géométrique des produits (GPS) — Décomposition des
caractéristiques géométriques pour la maîtrise de la fabrication
Reference number
ISO 20170:2019(E)
©
ISO 2019
ISO 20170:2019(E)
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
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below or ISO’s member body in the country of the requester.
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Published in Switzerland
ii © ISO 2019 – All rights reserved

ISO 20170:2019(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 3
5 Principles . 3
5.1 General . 3
5.2 Decomposition process . 4
5.3 Determination of components of a collected characteristic .12
5.4 Use of collected characteristics .13
5.5 Presentation of a GPS or a collected characteristic results .14
5.5.1 General.14
5.5.2 Decomposition steps .15
Annex A (informative) Relationship to the ISO GPS matrix model .19
Bibliography .20
ISO 20170:2019(E)
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 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 the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical product
specifications and verification.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2019 – All rights reserved

ISO 20170:2019(E)
Introduction
This document is a geometrical product specifications (GPS) standard and is to be regarded as a
fundamental GPS standard (see ISO 14638). It influences indirectly chain link E of the chains of
standards of geometrical characteristic (size, distance, form, orientation, location and run-out) in
the general GPS matrix model as graphically illustrated in Table A.1. The measurement as given in
chain link E is decomposed to evaluate quantity values of a geometrical characteristic, and to define
manufacturing adjustment values, not to manage the conformance of a workpiece.
The ISO GPS matrix model given in ISO 14638 gives an overview of the ISO GPS system of which this
document is a part. The fundamental rules of ISO GPS given in ISO 8015 apply to this document and
the default decision rules given in ISO 14253-1 apply to specifications made in accordance with this
document, unless otherwise indicated.
For more detailed information on the relationship of this document to other standards and to the GPS
matrix model, see Annex A.
The geometrical specification, as defined in ISO 1101, allows the evaluation of conformance or non-
conformance by defining a limit value for a geometrical characteristic as a univariate characteristic
(non-signed value). This evaluation alone does not provide the information necessary to adjust machine
tools parameters to maintain the production of conforming workpieces. The goal of decomposition of
the measurement result is to isolate parameter values that can be used to adjust the manufacturing
process. This document uses simple examples to illustrate the fundamental principles.
This document defines a number of independent characteristics obtained by decomposition that are
intended to assist with adjusting and evaluating the manufacturing process.
In statistical analysis the mean value and standard deviation are used to calculate capability indices. In
the case of a position tolerance, for example the location of a hole, which applies in a plane perpendicular
to the axis of the hole, the position characteristic is two times the radial distance between the centre of
the hole and its theoretically exact location. Capability indices based on the mean value and standard
deviation of this characteristic do not properly reflect the capability of a manufacturing process.
Instead, the position characteristic could be decomposed according to the kinematic arrangement of
the manufacturing process. If the axis of the hole is manufactured using a machine with linear X- and
Y-axes, the position characteristic could be decomposed into an X-component and a Y-component and
the studies of capability could be calculated based on these components so that they properly reflect
the capability of the manufacturing process.
SIS
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