SIST EN ISO 17450-3:2016

Geometrical product specifications (GPS) - General concepts - Part 3: Toleranced features (ISO 17450-3:2016)

ISO 17450-3:2016 gives default definitions for the extracted features (integral or derived) of workpieces, which are toleranced features in GPS specifications (dimensional, geometrical, or surface texture specifications). This part of ISO 17450 defines default geometrical features used to define GPS characteristics.

Geometrische Produktspezifikation (GPS) - Grundlagen - Teil 3: tolerierte Geometrieelemente (ISO 17450-3:2016)

Dieser Teil von ISO 17450 enthält defaultmäßige Festlegungen für die extrahierten Geometrieelemente (integrale oder abgeleitete) von Werkstücken, die in GPS-Spezifikationen (Maßspezifikation, geometrische Spezifikation oder Spezifikation der Oberflächenbeschaffenheit) als tolerierte Geometrieelemente angesehen werden.

Spécification géométrique des produits (GPS) - Concepts généraux - Partie 3: Éléments tolérancés (ISO 17450-3:2016)

ISO 17450-3:2016 donne les définitions par défaut pour les éléments (intégraux ou dérivés) extraits des pièces, qui sont des éléments tolérancés dans les spécifications GPS (spécifications dimensionnelles, géométriques, ou d'état de surface). La présente partie de l'ISO 17450 définit les éléments géométriques par défaut utilisés pour définir les caractéristiques GPS.

Specifikacija geometrijskih veličin izdelka (GPS) - Splošni pojmi - 3. del: Tolerirane značilnosti (ISO 17450-3:2016)

Ta del standarda ISO 17450 določa pridobljene značilnosti (sestavne ali izpeljane) obdelovancev, ki jih je mogoče obravnavati v specifikaciji geometrijskih veličin izdelka (GPS) (dimenzijska specifikacija, geometrijska specifikacija, specifikacija površinske strukture). Določa pogoje za privzete definicije, npr. kadar na risbi niso podani modifikatorji z razširjeno oznako značilnosti.

General Information

• Status: Published
• Public Enquiry End Date: 05-Oct-2014
• Publication Date: 16-Aug-2016
• ICS: 17.040.40 - Geometrical Product Specification (GPS)
• Technical Committee: ISEL - Mechanical elements
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 13-Jul-2016
• Due Date: 17-Sep-2016
• Completion Date: 17-Aug-2016
• Ref Project: EN ISO 17450-3:2016 - Geometrical product specifications (GPS) - General concepts - Part 3: Toleranced features (ISO 17450-3:2016)

Relations

• Replaces: SIST EN ISO 14660-2:2002 - 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 (ISO 14660-2:1999)
• Effective Date: 01-Sep-2016
• Replaces: SIST ISO 14660-2:2002 - 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
• Effective Date: 01-Sep-2016

Overview

EN ISO 17450-3:2016 (ISO 17450-3:2016) is a fundamental Geometrical Product Specification (GPS) standard published by CEN/ISO. It provides default definitions for extracted features (integral or derived) of workpieces that are used as toleranced features in GPS specifications - covering dimensional, geometrical and surface texture characteristics. This part of ISO 17450 defines the default geometrical features and decision rules used when specifying and verifying toleranced features.

Key topics and requirements

• Default feature definitions: Provides standardized definitions for integral features, median features and elementary toleranced features, ensuring consistent interpretation of toleranced geometry.
• Extracted features: Describes how extracted integral features are derived from real workpiece geometry (point extraction, sectioning and intersection rules).
• Opposing point pair and median concepts: Defines terms such as opposing point pair, median point/line/surface and median centre used to calculate sizes and positions for features of size.
• Rules for establishing geometrical features: Specifies default rules for forming section lines, intersection planes (full or half planes), boundaries and how a complete extracted integral feature relates to elementary toleranced features.
• Relationship to GPS characteristics: Explains how toleranced features link to GPS characteristics (intrinsic, location and orientation) used in dimensional and geometrical specifications.
• Verification implications: Clarifies default assumptions used in inspection and verification when infinite point extraction is not possible in practice.

Applications and users

EN ISO 17450-3 is used wherever consistent interpretation of toleranced features is required:

• Mechanical design and CAD/CAM: defining and communicating toleranced geometry in drawings and models.
• Manufacturing and process engineering: setting and interpreting feature tolerances for machining, assembly and production control.
• Metrology and QA/inspection laboratories: establishing how measured data map to extracted and toleranced features for verification and acceptance.
• Standards bodies and technical committees: harmonizing terminology and rules across GPS standards and regulatory documents.

Typical users: mechanical designers, metrologists, inspection engineers, quality managers, calibration laboratories and standards developers seeking consistent GPS practice.

Related standards

• ISO 17450-1, 17450-2, 17450-4 (GPS general concepts series)
• ISO 22432 (features utilized in specification and verification)
• ISO 25378 (characteristics and conditions)
• ISO 14405 (dimensional specification)
• ISO 1101 (geometrical specification)
• ISO 8015, ISO 14253-1 (decision and default rules)

Keywords: EN ISO 17450-3:2016, ISO 17450-3, Geometrical Product Specifications, GPS, toleranced features, extracted features, median feature, opposing point pair, dimensional specification, metrology.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2016
1DGRPHãþD
SIST EN ISO 14660-2:2002
SIST ISO 14660-2:2002
6SHFLILNDFLMDJHRPHWULMVNLKYHOLþLQL]GHOND*366SORãQLSRMPLGHO7ROHULUDQH
]QDþLOQRVWL,62
Geometrical product specifications (GPS) - General concepts - Part 3: Toleranced
features (ISO 17450-3:2016)
Geometrische Produktspezifikation (GPS) - Grundlagen - Teil 3: tolerierte
Geometrieelemente (ISO 17450-3:2016)
Spécification géométrique des produits (GPS) - Concepts généraux - Partie 3: Éléments
tolérancés (ISO 17450-3:2016)
Ta slovenski standard je istoveten z: EN ISO 17450-3:2016
ICS:
17.040.40 6SHFLILNDFLMDJHRPHWULMVNLK Geometrical Product
YHOLþLQL]GHOND*36 Specification (GPS)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 17450-3
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2016
EUROPÄISCHE NORM
ICS 17.040.01
English Version
Geometrical product specifications (GPS) - General
concepts - Part 3: Toleranced features (ISO 17450-3:2016)
Spécification géométrique des produits (GPS) - Geometrische Produktspezifikation (GPS) - Grundlagen
Concepts généraux - Partie 3: Éléments tolérancés (ISO - Teil 3: Tolerierte Geometrieelemente (ISO 17450-
17450-3:2016) 3:2016)
This European Standard was approved by CEN on 19 December 2015.

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, 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: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 17450-3:2016 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 17450-3:2016) 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 December 2016, and conflicting national standards
shall be withdrawn at the latest by December 2016.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 17450-3:2016 has been approved by CEN as EN ISO 17450-3:2016 without any
modification.
INTERNATIONAL ISO
STANDARD 17450-3
First edition
2016-06-01
Geometrical product specifications
(GPS) — General concepts —
Part 3:
Toleranced features
Spécification géométrique des produits (GPS) — Concepts
généraux —
Partie 3: Éléments tolérancés
Reference number
ISO 17450-3:2016(E)
©
ISO 2016
ISO 17450-3:2016(E)
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, 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 on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2016 – All rights reserved

ISO 17450-3:2016(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General . 2
5 Default rules for establishing geometrical features . 5
5.1 General . 5
5.2 Integral feature . 6
5.2.1 General. 6
5.2.2 Extracted integral line . 6
5.2.3 Extracted integral point . 6
5.2.4 Opposing point pair . . 6
5.3 Median feature . 9
5.3.1 General. 9
5.3.2 Median point .12
5.3.3 Median line .15
5.3.4 Median surface .16
Annex A (informative) Relation in the GPS matrix model .18
Bibliography .19
ISO 17450-3:2016(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 on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 213, Dimensional and geometrical product
specifications and verifications.
This first edition of ISO 17450-3 cancels and replaces ISO 14660-2:1999, which has been technically
revised.
ISO 17450 consists of the following parts, under the general title Geometrical product specification
(GPS) — General concepts:
— Part 1: Model for geometrical specification and verification
— Part 2: Basic tenets, specifications, operators, uncertainties and ambiguities
— Part 3: Toleranced features
— Part 4: Geometrical characteristics for quantifying form, orientation, location and run-out deviations
iv © ISO 2016 – All rights reserved

ISO 17450-3:2016(E)
Introduction
This part of ISO 17450 is a geometrical product specifications (GPS) standard and is to be regarded as a
fundamental GPS standard (see ISO 14638). It influences all chain links of all chains of standards in the
general GPS matrix model.
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 of the relation of this part of ISO 17450 to the GPS matrix model, see
Annex A.
INTERNATIONAL STANDARD ISO 17450-3:2016(E)
Geometrical product specifications (GPS) — General
concepts —
Part 3:
Toleranced features
1 Scope
This part of ISO 17450 gives default definitions for the extracted features (integral or derived) of
workpieces, which are toleranced features in GPS specifications (dimensional, geometrical, or surface
texture specifications). This part of ISO 17450 defines default geometrical features used to define GPS
characteristics.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 17450-1, Geometrical product specifications (GPS) — General concepts — Part 1: Model for geometrical
specification and verification
ISO 22432, Geometrical product specifications (GPS) — Features utilized in specification and verification
ISO 25378, Geometrical product specification (GPS) — Characteristics and conditions — Definitions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 17450-1, ISO 22432, ISO 25378
and the following apply.
3.1
opposing point pair
collection of two points established simultaneously, the separation of which is a local size of a
feature of size
Note 1 to entry: The distance between the two points constituting an opposing point pair is a two point size (see
ISO 14405-1).
Note 2 to entry: In the case of a feature of size defined as “two opposed planes”, the median point of the two
points constituting an extracted opposing point pair belongs to its median extracted surface.
3.2
elementary toleranced feature
smallest part of a complete geometrical feature for which a GPS characteristic is defined
EXAMPLE 1 For an unrestricted flatness specification, a global GPS characteristic is defined for the complete
integral feature, which in this case is an elementary toleranced feature.
EXAMPLE 2 For a straightness specification, a local GPS characteristic may be defined for each line feature in
a given direction in the complete integral feature. Each of these line features is the intersection between a planar
feature and the complete integral feature and is an elementary toleranced feature. The complete integral feature
is the toleranced feature.
ISO 17450-3:2016(E)
3.3
toleranced feature
complete toleranced feature
set of one or more geometrical features, for which a GPS characteristic is defined or a collection of
elementary toleranced features
Note 1 to entry: “Toleranced feature” without a qualifier is a complete feature, not an elementary feature.
Note 2 to entry: A toleranced feature is a set of geometrical features on which a GPS specification is defined.
3.4
median centre
centre point calculated as the centre of an opposing point pair
Note 1 to entry: A centre of an associated sphere is a directly associated median point (see ISO 22432 and 5.3.2.1)
and not a median centre.
4 General
A GPS characteristic (see ISO 25378) is a basic characteristic (an intrinsic characteristic or a location or
an orientation situation characteristic).
— The size of a deviated feature (see ISO 22432), which is nominally a feature of size is an intrinsic
characteristic (see ISO 17450-1), which is used for dimensional specification (see ISO 14405).
— The value calculated from the local distances between a deviated feature and a reference feature
(see ISO 22432) is a situation characteristic (see ISO 17450-1), which is used for geometrical
specification (see ISO 1101) or for surface texture characteristic (see ISO 25378 and ISO 1302).
A deviated feature is obtained from an input feature (see ISO 25378) by using or not using the operation
of filtration and/or association.
By default, the input integral feature is defined by an extraction of an infinite number of points from the
real feature. In verification, the extracted integral feature does not contain an infinite number of points.
By default, the input feature is a single feature, see ISO 22432.
By default, a boundary belongs to both adjacent single extracted integral features.
If the complete extracted integral feature is a line, then the complete extracted line is defined by the
intersection of the complete extracted integral surface feature with an intersection feature.
The intersection plane is a full plane (see Figure 1 and Figure 2) or a half plane (see Figure 3). The
intersection plane can be explicitly or implicitly defined by GPS specification with or without a specific
location. When the intersection has no specific location, then it belongs to a set of planes containing an
axis or a set of parallel planes or a set of planes oriented from an associated feature.
2 © ISO 2016 – All rights reserved

ISO 17450-3:2016(E)
Key
1 tolerance feature: complete extracted feature
2 associated feature
3 intersection plane which is established parallel to the associated surface
4 elementary toleranced feature: complete extracted section line
Figure 1 — Example of intersection plane used to establish an elementary toleranced feature
Key
1 complete extracted feature
2 associated feature
3 situation feature of the associated feature (in this case, its axis)
4 elementary toleranced feature: complete extracted section line
5 intersection plane perpendicular to the axis of the associated feature
Figure 2 — Example of intersection plane constrained in orientation used to establish an
elementary toleranced feature
ISO 17450-3:2016(E)
Key
1 toleranced feature: complete extracted feature
2 associated feature
3 situation feature of the associated feature (in this case, its axis)
4 intersection plane including the situation feature of the associated feature
5 elementary toleranced feature: complete extracted section line
Figure 3 — Example of intersection plane, as a half plane, used to establish an elementary
toleranced feature
If the input feature is a restricted feature, then its boundaries are defined from the single feature’s
boundaries with other features. The nominal location of the boundaries of the restricted feature shall be
given in the specification. To identify a location intrinsically defined on a single integral feature, a primary
datum is defined from the single integral feature. The location is defined from this primary datum.
To identify a location on a single integral feature defined in a given distance from an adjacent feature,
a primary datum is first defined from the single integral feature. Subsequently, a secondary datum as a
single datum or a common datum is defined from one or more adjacent features from which the location
is defined. The location is defined in thi
...