SIST EN ISO 18183-2:2024

Geometrical product specifications (GPS) - Partition - Part 2: Nominal model (ISO 18183-2:2024)

This document specifies the methods used to partition a nominal model.

Geometrische Produktspezifikation (GPS) - Partition - Teil 2: Nennmodell (ISO 18183-2:2024)

Dieses Dokument legt die Methoden zur Partition eines Nennmodells fest.

Spécification géométrique des produits (GPS) - Partition - Partie 2: Modèle nominal (ISO 18183-2:2024)

Le présent document spécifie les méthodes utilisées pour obtenir la partition d’un modèle nominal.

Specifikacija geometrijskih veličin izdelka (GPS) - Razdelitev - 2. del: Nominalnii model (ISO 18183-2:2024)

Ta dokument določa razdelitev za nominalni model.

General Information

• Status: Published
• Publication Date: 25-Feb-2024
• ICS: 17.040.40 - Geometrical Product Specification (GPS)
• Technical Committee: ISEL - Mechanical elements
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 21-Feb-2024
• Due Date: 27-Apr-2024
• Completion Date: 26-Feb-2024
• Ref Project: EN ISO 18183-2:2024 - Geometrical product specifications (GPS) - Partition - Part 2: Nominal model (ISO 18183-2:2024)

Overview

EN ISO 18183-2:2024 - Geometrical product specifications (GPS) - Partition - Part 2: Nominal model specifies the methods used to partition a nominal model. It defines how a CAD model or drawing is subdivided into partitioned features (surfaces, edges, vertices and their sub-features) by applying the operations of selection, simplification and subdivision. The standard establishes a default nominal partition (the set of single surfaces) and describes rules needed to make specifications unambiguous and suitable for automated verification and modern manufacturing workflows.

Key topics and requirements

• Scope: Methods for partitioning nominal models used in product specification and verification.
• Partition operations: Clear definitions and examples for selection, simplification and subdivision to derive partitioned features from models or drawings.
• Default nominal partition: If not otherwise specified, the partition produced by single-surface decomposition is the default set of partitioned features.
• Model elements: Recognition that nominal models consist of surfaces, edges, blend edges and vertices; these form the initial partition.
• Duality for verification: Partition concepts are intended to be used symmetrically in specification and verification (see relation to ISO 18183-3).
• Relation to ISO GPS framework: This part applies concepts from ISO 18183-1 and sits within the ISO GPS matrix model; fundamental GPS rules (ISO 8015) and decision rules (ISO 14253-1) apply unless otherwise stated.
• Examples and informative annex: Illustrative figures and Annex A show relationships to the ISO GPS matrix model and how the document influences feature, measurement and conformity chains.

Applications and practical value

• Ensures consistent partitioning of nominal models for tolerance specification, metrology planning and inspection.
• Enables unambiguous interpretation of restricted-area tolerances, datum targets and combined features across CAD, drawings and inspection software.
• Supports automation: clear rules help CAD/CAM/inspection software and future autonomous manufacturing systems to identify and record partitioned features without manual intervention.
• Improves interoperability between design, quality and manufacturing teams by standardizing how model features are defined for verification.

Who should use this standard

• Design and CAD engineers defining nominal models and tolerances
• Metrology and quality engineers creating inspection plans
• CAM/inspection software developers implementing feature recognition and partitioning logic
• Standards committees and technical authors working on GPS-related specifications
• Manufacturers adopting automated verification and Industry 4.0 workflows

Related standards

• ISO 18183-1 (vocabulary and basic concepts) - concepts applied by this part
• ISO 18183-3 - verification aspects and duality principle
• ISO 8015 (fundamental GPS rules) and ISO 14253-1 (decision rules) - governing principles referenced in this document
• ISO GPS matrix model (ISO 14638) - contextual placement within the GPS system

Keywords: EN ISO 18183-2:2024, nominal model, partition, GPS, CAD partitioning, partitioned features, selection simplification subdivision, geometrical product specifications.

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2024
Specifikacija geometrijskih veličin izdelka (GPS) - Razdelitev - 2. del: Nominalnii
model (ISO 18183-2:2024)
Geometrical product specifications (GPS) - Partition - Part 2: Nominal model (ISO 18183
-2:2024)
Geometrische Produktspezifikation (GPS) - Partition - Teil 2: Nennmodell (ISO 18183-
2:2024)
Spécification géométrique des produits (GPS) - Partition - Partie 2: Modèle nominal (ISO
18183-2:2024)
Ta slovenski standard je istoveten z: EN ISO 18183-2:2024
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 18183-2
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2024
EUROPÄISCHE NORM
ICS 17.040.40
English Version
Geometrical product specifications (GPS) - Partition - Part
2: Nominal model (ISO 18183-2:2024)
Spécification géométrique des produits (GPS) - Geometrische Produktspezifikation (GPS) - Partition -
Partition - Partie 2: Modèle nominal (ISO 18183- Teil 2: Nennmodell (ISO 18183-2:2024)
2:2024)
This European Standard was approved by CEN on 25 December 2023.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 18183-2:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 18183-2:2024) 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 August 2024, and conflicting national standards shall
be withdrawn at the latest by August 2024.
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.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 18183-2:2024 has been approved by CEN as EN ISO 18183-2:2024 without any
modification.
International
Standard
ISO 18183-2
First edition
Geometrical product specifications
2024-02
(GPS) — Partition —
Part 2:
Nominal model
Spécification géométrique des produits (GPS) — Partition —
Partie 2: Modèle nominal
Reference number
ISO 18183-2:2024(en) © ISO 2024

ISO 18183-2:2024(en)
© ISO 2024
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 on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
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ISO copyright office
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Published in Switzerland
ii
ISO 18183-2:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Partition concepts . 1
5 Default nominal partition . 4
6 General information . 4
Annex A (informative) Relationship to the ISO GPS matrix model . 5
Bibliography . 6

iii
ISO 18183-2:2024(en)
Foreword
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