ISO 10303-519:2000

Industrial automation systems and integration — Product data representation and exchange — Part 519: Application interpreted construct: Geometric tolerances

Systèmes d'automatisation industrielle et intégration — Représentation et échange de données de produits — Partie 519: Constuction interprétée d'application: Tolérances géométriques

General Information

• Status: Published
• Publication Date: 01-Mar-2000
• ICS: 25.040.40 - Industrial process measurement and control
• Technical Committee: ISO/TC 184/SC 4 - Industrial data
• Drafting Committee: ISO/TC 184/SC 4/WG 12 - STEP product modelling and resources
• Current Stage: 9093 - International Standard confirmed
• Start Date: 28-Jun-2024
• Completion Date: 12-Feb-2026

Overview

ISO 10303-519:2000 - part of the ISO 10303 (STEP) family - defines an application interpreted construct (AIC) for representing geometric tolerances in a computer-interpretable way. The AIC specifies how integrated resources from STEP are interpreted to represent allowable deviations of a product’s shape in accordance with ISO 1101. It provides an EXPRESS schema and entity specializations to encode common geometric tolerance constructs for neutral product data representation and exchange.

Key Topics

• Purpose and scope
  • Interpretation of integrated STEP resources to represent shape tolerances (form, orientation, location, run-out) per ISO 1101.
  • In-scope items include tolerance constraints on shape, tolerance values, datums and datum references, and derived shape elements (e.g., centre lines, intersections).
  • Out-of-scope items explicitly include plus/minus tolerances, presentation on engineering drawings, mathematical definitions of tolerances, inspection methods and tolerance synthesis/analysis.
• EXPRESS schema & entities
  • The AIC provides an EXPRESS short listing (schema: aic_geometric_tolerances) that imports types from STEP integrated resources (measure, shape_aspect_definition, shape_tolerance).
  • Defines subtypes of the generic geometric_tolerance entity for specific tolerance types.
• Enumerated geometric tolerances covered
  • Angularity, circular runout, coaxiality, concentricity, cylindricity, flatness, line & surface profile, parallelism, perpendicularity, position, roundness, straightness, symmetry, total runout, and common datum constructs.
• Assumptions & relationships
  • Intended to be instantiated within application protocol schemas (APs) that implement industrial requirements.
  • References ISO/TS 17450 for shape models (nominal, intermediate/skin model, actual).

Applications and Users

• Primary uses
  • Encoding geometric tolerances in neutral STEP files for CAD/CAM/PLM interoperability.
  • Defining tolerance semantics for product data exchange, archiving, and shared product databases.
• Who uses it
  • Application protocol developers and standards implementers working with STEP.
  • CAD/CAM/PLM system integrators, data exchange engineers, metrology and quality teams who need interoperable tolerance semantics.
  • Organizations implementing automated downstream processes that consume tolerance data (manufacturing planning, inspection software).
• Practical value
  • Enables consistent, machine-readable representation of geometric tolerances across systems, improving interoperability and traceability of design intent.

Related Standards

• ISO 1101 (Geometrical tolerancing)
• ISO 10303 series (STEP): Parts 1, 11, 41, 47, 202
• ISO 5459 (Datums and datum-systems)
• ISO/TS 17450 (GPS model for specification & verification)

Keywords: ISO 10303-519, STEP, geometric tolerances, ISO 1101, application interpreted construct, EXPRESS schema, product data exchange, CAD interoperability, datums, PLM.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 10303-519
First edition
2000-03-01
Industrial automation systems and
integration — Product data representation
and exchange —
Part 519:
Application interpreted construct:
Geometric tolerances
Systèmes d'automatisation industrielle et intégration — Représentation et
échange de données de produits —
Partie 519: Construction interprétée d'application: Tolérances
géométriques
Reference number
©
ISO 2000
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ii © ISO 2000 – All rights reserved

Contents Page
1Scop e.1
2Normative references.2
3Terms, denitions, and abbreviations.3
3.1Terms dened in ISO10303{1.3
3.2Terms dened in ISO10303{202.3
3.3Terms dened in ISO5459.4
3.4Terms dened in ISO/TS17450.4
3.5Other denitions.4
3.6Abbreviations.5
4EXPRESS short listing.5
4.1Fundamental concepts and assumptions.6
4.2aic geometric tolerances entity denitions.8
4.2.1angularity tolerance.8
4.2.2circular runout tolerance.9
4.2.3coaxiality tolerance.9
4.2.4common datum.10
4.2.5concentricity tolerance.11
4.2.6cylindricity tolerance.11
4.2.7atness tolerance.12
4.2.8line prole tolerance.13
4.2.9parallelism tolerance.14
4.2.10p erp endicularity tolerance.15
4.2.11p osition tolerance.15
4.2.12roundness tolerance.16
4.2.13straightness tolerance.17
4.2.14surface prole tolerance.18
4.2.15symmetry tolerance.18
4.2.16total runout tolerance.19
Annex A (normativ e) Short names of entities.20
Annex B (normativ e) Information ob ject registration.21
B.1 Do cument identication.21
B.2 Schema identication.21
Annex C (informativ e) EXPRESS-G diagrams.22
Annex D (informativ e) Computer interpretable listings.28
Index.29
Figures
Figure C.1 AIC expanded listing diagram in EXPRESS{G:1of5.23
Figure C.2 AIC expanded listing diagram in EXPRESS{G:2of5.24
Figure C.3 AIC expanded listing diagram in EXPRESS{G:3of5.25
Figure C.4 AIC expanded listing diagram in EXPRESS{G:4of5.26
Figure C.5 AIC expanded listing diagram in EXPRESS{G:5of5.27
Tables
Table A.1 Short names of entities.20
iv © ISO 2000 – All rights reserved

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national
standards b o dies (ISO mem b er b o dies). The work of preparing International Standards is nor-
mally carried out through ISO technical committees. Each member body interested in a sub ject
for which a technical committee has b een established has the right to be represented on that
committee. International organizations, governmental and non-go vernmental, in liaison with
ISO, also tak e part in the work. ISO collab orates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotec hnical standardization.
Draft International Standards adopted by the technical committees are circulated to the member
b o dies for voting. Publication as an International Standard requires approval by at least75%
of the memb er b o dies casting a vote.
International Standard ISO10303{519was prepared by Technical Committee ISO/TC184,
Industrial automation systems and integration, Sub committee SC4, Industrial data.
This International Standard is organized as a series of parts, each published separately.The
parts of ISO10303fall in to one of the following series: description metho ds, in tegrated resources,
application proto cols, abstract test suites, implementation metho ds, and conformance testing.
The series are describ ed in ISO10303{1.
A complete list of parts of ISO10303is a vailable from the internet:
http://www.nist.go v/sc4/editing/step/titles/
Annexes A and B form an integral part of this part of ISO10303.Annexes C and D are for
information only.
Intro duction
ISO10303is an International Standard for the computer-in terpretable representation and ex-
change of pro duct data. The ob jective is to provide a neutral mechanism capable of describing
pro duct data throughout the life cycle of a pro duct indep endent from any particular system.
The nature of this description makes it suitable not only for neutral le exc hange, but also as a
basis for implementing and sharing pro duct databases and archiving.
This International Standard is organized as a series of parts, each published separately.The
parts of ISO10303fall in to one of the following series: description metho ds, in tegrated resources,
application interpreted constructs, application proto cols, abstract test suites, implementation
metho ds, and conformance testing. The series are describ ed in ISO10303{1.This part of
ISO10303is a memb er of the application interpreted constructs series.
An application interpreted construct (AIC) pro vides a logical grouping of interpreted constructs
that supp orts a sp ecic functionalit y for the usage of pro duct data across multiple application
contexts. An interpreted construct is a common interpretation of the integrated resources that
supp orts shared information requirements among application proto cols.
This do cument sp ecies the application interpreted construct for the description of allowable
deviation of physical characteristics of a pro duct’s shap e according to ISO1101:1999.
vi © ISO 2000 – All rights reserved

INTERNATIONAL STANDARD ISO 10303-519:2000(E)
Industrial automation systems and integration|
Pro duct data representation and exchange|
Part519:
Application interpreted construct:
Geometric tolerances
1Scop e
This part of ISO10303sp ecies the in terpretation of the integrated resources to satisfy require-
ments for the representation of the allowable deviation of physical characteristics of a pro duct’s
shap e according to ISO1101.
The following are within the scop e of this part of ISO10303:
|tolerances as constraints on shap e asp ects of a pro duct;
|the sp ecication of tolerances of the shap e of a pro duct;
|the representation of geometrical tolerances;
|the representation of tolerance values;
|the sp ecication of datums and datum references;
|the identication of deriv ed shap e elements suchascentre lines and intersections.
The following are outside the scop e of this part of ISO10303:
|the representation of plus-min us tolerances and limits and ts;
|the denition of the fundamental principles, concepts, and terminology of tolerancing and
dimensioning;
|the mathematical denition of tolerances and datums;
|the description of dimensioning or tolerancing practices;
|the sp ecication of dimensional insp ection metho ds;
|the synthesis and analysis of tolerances;
|the tolerancing of pro duct characteristics other than shap e;
|the presentation of tolerances on engineering drawings;
|the representation of the pro duct’s shap e;
|the representation of dimensions.
NOTE-This part of ISO10303pro vides the interpretation of the integrated resources in the area
of pro duct data indicated ab ove, whereas the application of industrial requiremen ts is a task to b e
fullled b y application proto cols (APs). Parts of ISO10303that mak e use of the elements dened in
this part are strongly advised to check the ISO standards that deal with the application of tolerances
available at the time of the development.
2Normative references
The following normative do cuments contain provisions which, through reference in this text,
constitute provisions of this part of ISO10303.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 ISO10303are encouraged to investigate the p ossibility of applying the
most recent editions of the normative do cuments indicated b elow. For undated references, the
latest edition of the normative do cument referred to applies. Memb ers of ISO and IEC maintain
registers of currently valid International Standards.
1)
ISO 1101 , Geometrical Product Specifications (GPS) — Geometrical tolerancing — Tolerances of form,
orientation, location and run-out (Revision of ISO 1101:1983).
ISO5459:1981,Technical drawings {Ge ometrical tolerancing{Datums and datum-systems for
geometrical tolerances.
ISO8824{1:1995,Information Technology{Open Systems Interconnection{Abstract Syntax
Notation one (ASN.1){Part1:Specic ation of Basic Notation.
ISO10303{1:1994,Industrial automation systems and integration{Pr oduct data representation
and exchange{Part1:Overview and fundamental principles.
ISO10303{11:1994,Industrial automation systems and integration{Product data representa-
tion and exchange{Part11:Description methods: The EXPRESS language reference manual.
ISO10303{41:1994,Industrial automation systems and integration{Product data representa-
tion and exchange{Part41:Integrated generic resources: Fundamentals of product description
and support.
ISO10303{47:1997,Industrial automation systems and integration{Product data representa-
tion and exchange{Part47:Integrated generic resources: Shape variation tolerances.
1)
To b e published.
2 © ISO 2000 – All rights reserved

ISO10303{202:1996,Industrial automation systems and integration {Pr oduct data representa-
tion and exchange{Part202:Application protocol: Associative draughting.
1)
ISO/TS17450,Geometrical product specic ation (GPS){Model for geometric specic ation
and veric ation.
3Terms, denitions, and abbreviations
3.1Terms dened in ISO10303{1
For the purp ose of this part of ISO10303,the following terms dened in ISO10303{1apply:
|abstract test suite (A TS);
|application;
|application context;
|application proto col (AP);
|implementation metho d;
|information;
|integrated resource;
|interpretation;
|mo del;
|pro duct;
|pro duct data.
3.2Terms dened in ISO10303{202
For the purp ose of this part of ISO10303,the following terms dened in ISO10303{202ap-
ply:
3.2.1
application interpreted construct
a logical grouping of interpreted constructs that supp orts a sp ecic function for the usage of
pro duct data across multiple application contexts
[ISO10303{202:1996,denition3.7.1]
3.3Terms dened in ISO5459
For the purp ose of this part of ISO10303,the following terms dened in ISO5459apply:
|datum system
3.4Terms dened in ISO/TS17450
For the purp ose of this part of ISO10303,the following terms dened in ISO/TS17450ap-
ply:
3.4.1
ideal feature
p erfect shap e feature dened b ya typ e and characterisitcs
[ISO/TS17450,denition3.11]
3.4.2
invariance class
a group of ideal features dened b y the same invariance degree
[ISO/TS17450,denition3.13]
3.4.3
invariance degree of an ideal feature
displacement(s) of the ideal feature for whic h the feature is kept identical in the space
[ISO/TS17450,denition3.14]
3.4.4
skin mo del
mo del of the physical interface of the workpiece with its environment
[ISO/TS17450,denition3.24]
3.5Other denitions
For the purp ose of this part of ISO10303,the following denitions apply:
3.5.1
revolute surface feature
surface of invariance class revolute, helical, cylindrical, or spherical
4 © ISO 2000 – All rights reserved

3.6Abbreviations
For the purp ose of this part of ISO10303,the following abbreviations apply:
AIC application interpreted construct
AP application proto col
ATS abstract test suite
4EXPRESS short listing
This clause sp ecies the EXPRESS schema that uses elements from the integrated resources
and contains the typ es, entity sp ecializations, and functions that are sp ecic to this part of
ISO10303.
NOTE1-There may b e subtyp es and items of select lists that app ear in the integrated resources
that are not imp orted into the AIC. Constructs are eliminated from the subt yp e tree or select list
through the use of the implicit interface rules of ISO10303-11.References to eliminated constructs
are outside the scop e of the AIC. In some cases, all items of the select list are eliminated. Because
AICs are intended to be implemented in the context of an application proto col, the items of the
select list will b e dened b y the scop e of the application proto col.
EXPRESS sp ecication:
*)
SCHEMA aic_geometric_to lerances;
USE FROM measure_schema --ISO10303-41
(derived_unit,
named_unit);
USE FROM shape_aspect_def inition_sc hema--ISO10303-47
(apex,
centre_of_symmetr y,
composite_shape_a spect,
datum,
datum_feature,
datum_reference,
datum_target,
derived_shape_asp ect,
extension,
geometric_alignme nt,
geometric_interse ction,
parallel_offset,
perpendicular_to,
referenced_modifi ed_d atum,
shape_aspect_deri ving_re lationship,
symmetric_shape_a spect,
tangent);
USE FROM shape_tolerance_ schema--ISO10303-47
(dimension_relate d_ tolerance_ zone_ element,
geometric_toleran ce,
geometric_toleran ce_r elationship,
geometric_toleran ce_w ith_d atum_ reference,
geometric_toleran ce_w ith_d efined_u nit,
modified_geometri c_ tolerance,
projected_zone_de finition,
runout_zone_defin ition,
runout_zone_orien tation_ reference_ direction,
tolerance_zone,
tolerance_zone_de finition);
(*
NOTE2-The schemas referenced ab ove can b e found in the following parts of ISO10303:
measure schema ISO10303-41
shap e asp ect denition schema ISO10303-47
shap e tolerance schema ISO10303-47
4.1Fundamental concepts and assumptions
The following entities are intended to b e indep endently instantiated in the application proto col
schemas that use this AIC:
|angularity tolerance;
|circular runout tolerance;
|coaxiality tolerance;
|common datum;
|concentricity tolerance;
|cylindricity tolerance;
|atness tolerance;
|line prole tolerance;
6 © ISO 2000 – All rights reserved

|parallelism tolerance;
|p erp endicularity tolerance;
|p osition tolerance;
|roundness tolerance;
|straightness tolerance;
|surface prole tolerance;
|symmetry tolerance;
|total runout tolerance.
The restrictions on the kind of geometric ideal features sp ecied in the referenced standards
apply when using the constructs dened in this part of ISO10303.When designing a given part,
several shap es may be successively considered: CAD systems are, usually,used to sp ecify the
nominal characteristics of a shap e. However, the shap e resulting from man ufacturing, nev er ts
exactly the nominal denition. Therefore, for a same part, t wo other shap es may b e considered:
|an intermediate shap e, where the manufacturing defects are considered and constrained
with resp ect to the nominal characteristics by tolerances;
|the actual shap e obtained after manufacturing.
NOTE1-See ISO/TS17450for further information ab out these three shap es.
NOTE2-The intermediate shap e is named "skin mo del" in ISO/TS17450.
EXAMPLE When a designer sp ecies that a face is planar, the manufactured face will not be
actually a plane but a surface. The purp ose of geometric tolerances is to sp ecify the zone in which
this surface shall lie on, e.g., b et ween two parallel planes.
NOTE3-The actual manufactured shap e is controlled by metrologists. Their control consists of
evaluating, whether the size characteristics, they measure on the actual shap e, are conforming to
the nominal characteristics and to the tolerances on these characteristics.
This part of ISO10303sp ecies subt yp es of the entity geometric tolerance that is dened in
ISO10303-47.Consequently,these subtyp es inherit the attribute toleranced shap e asp ect.
In this part of ISO10303and in any annotated schema that uses the entity data typ es dened
hereafter, the follo wing statements apply:
|A shap e asp ect referred to by the attribute geometric tolerance.toleranced shap e-
asp ect shall identify an element of the nominal shap e;
|A shap e asp ect,playing the role of a datum,a datum feature or a datum target,
shall identify an element of the nominal shap e.
4.2aic geometric tolerances entity denitions
4.2.1angularity tolerance
An angularity tolerance is a typ e of geometric tolerance with datum reference.The
tolerance zone is limited either by:
|two parallel planes, separated b y the distance sp ecied b y the tolerance value. In this case,
the planes form a sp ecied angle with the datums that are referenced;
|a cylinder with a diameter that is sp ecied b y the tolerance value. In this case, the cylinder
axis forms a sp ecied angle with the datums that are referenced.
The sp ecied angle shall not be a multiple of90degrees. In the case of0or180degrees, a
parallelism tolerance shall b e used. In the case of90or270degrees, a p erp endicularity-
tolerance shall be used. The sp ecied angle shall be dened using an instance of angular-
lo cation.The toleranced shap e asp ect is either a plane or a straight line.
NOTE-See ISO1101:1999for denition and areas of application of this t yp e of tolerance.
EXPRESS sp ecication:
*)
ENTITY angularity_toler ance
SUBTYPE OF (geometric_tole rance_wi th_d atum_ reference);
WHERE
WR1: SIZEOF(SELF\geo metric_t olerance_ with_ datum_r eference.d atum_ system)<3;
END_ENTITY;
(*
Formal prop ositions:
WR1: The angularity tolerance shall contain at least one element and at most two elements
in its datum system.
8 © ISO 2000 – All rights reserved

Informal prop ositions:
IP1: The datums referenced shall b e sucien t to identify a plane or a straight line.
IP2: The datums referred to in datum system shall b e sucien t to enable orientation of the
tolerance zone.
4.2.2circular runout tolerance
A circular runout tolerance is a typ e of geometric tolerance with datum reference.
The set of referenced datums shall contain an axis. There are four kinds of circular runout-
tolerances:
|radial;
|axial;
|in any direction;
|in a sp ecied direction.
Refer to the denition of circular run-out tolerance in ISO1101:1999for a complete description
of the dieren t tolerance zones.
EXPRESS sp ecication:
*)
ENTITY circular_runout_ tolerance
SUBTYPE OF (geometric_tole rance_wi th_d atum_ reference);
WHERE
WR1: SIZEOF(SELF\geo metric_t olerance_ with_ datum_r eference.d atum_ system)<=2;
END_ENTITY;
(*
Formal prop ositions:
WR1: The circular runout tolerance shall contain one or two elements in its datum-
system.
4.2.3coaxiality tolerance
A coaxiality tolerance is a typ e of geometric tolerance with datum reference.This
tolerance zone is limited by a cylinder, the diameter of which is the tolerance value. The
cylinder axis is dened b y the datums that are referenced.
NOTE-See ISO1101:1999for denition and areas of application of this t yp e of tolerance.
EXPRESS sp ecication:
*)
ENTITY coaxiality_toler ance
SUBTYPE OF (geometric_tole rance_wi th_d atum_ reference);
WHERE
WR1: SIZEOF(SELF\geo metric_t olerance_ with_ datum_r eference.d atum_ system)<=2;
END_ENTITY;
(*
Formal prop ositions:
WR1: The coaxiality tolerance shall contain one or two elements in its datum system.
Informal prop ositions:
IP1: The shap e asp ect,the coaxiality tolerance is applied to, is a rev olute surface feature.
4.2.4common datum
A common datum is a typ e of datum and of comp osite shap e asp ect that is established
bytwo other shap e asp ects of typ e datum.
EXPRESS sp ecication:
*)
ENTITY common_datum
SUBTYPE OF (composite_shap e_a spect,datum);
WHERE
WR1: SIZEOF(SELF.component_r elationships)=2;
WR2: SIZEOF(QUERY(sar<*
SELF.component_re lationships|NOT(
(’AIC_GEOMETRIC_T OLERANCES. DATUM’ IN
TYPEOF (sar.related_shap e_a spect)) AND NOT(
’AIC_GEOMETRIC_TO LERANCES.C OMMON_D ATUM’
IN TYPEOF (sar.related_shap e_ aspect)))))=0;
END_ENTITY;
(*
10 © ISO 2000 – All rights reserved

Formal prop ositions:
WR1: The common datum shall have exactly two comp onent relationships.
WR2: The datums, a common datum is established by,shall b e of typ e datum but not of
typ e common datum.
4.2.5concentricity tolerance
A concentricity tolerance is a typ e of geometric tolerance with datum reference that
describ es the allowable tolerance a cylindrical or conical feature of a part may deviate from
b eing concentric with resp ect to a datum. The toleranced shap e asp ect and the referenced
datum corresp ond to p oints.
NOTE-See ISO1101:1999for denition and areas of application of this t yp e of tolerance.
EXPRESS sp ecication:
*)
ENTITY concentricity_to lerance
SUBTYPE OF (geometric_tole rance_wi th_d atum_ reference);
WHERE
WR1: SIZEOF(SELF\geo metric_t olerance_ with_ datum_r eference.d atum_ system)=1;
END_ENTITY;
(*
Formal prop ositions:
WR1: The concentricity tolerance shall contain exactly one element in its datum system.
Informal prop ositions:
IP1: The shap e asp ect,the concentricity tolerance is applied to, is symmetrical with re-
sp ect to rotation.
4.2.6cylindricity tolerance
A cylindricity tolerance is a typ e of geometric tolerance that describ es the allowable tol-
erance a surface may deviate from b eing nominally cylindrical. The tolerance zone is limited by
two coaxial cylinders, with a dierence in radii of the tolerance v alue.
NOTE-See ISO1101:1999for denition and areas of application of this t yp e of tolerance.
EXPRESS sp ecication:
*)
ENTITY cylindricity_tol erance
SUBTYPE OF (geometric_tole rance);
WHERE
WR1: NOT (’AIC_GEOMETRIC_ TOLERANCES.’+
’GEOMETRIC_TOLE RANCE_WI TH_D ATUM_ REFERENCE’ IN TYPEOF (SELF));
END_ENTITY;
(*
Formal prop ositions:
WR1: The cylindricity tolerance shall not b e of typ e geometric tolerance with datum-
reference.
Informal prop ositions:
IP1: The shap e asp ect,the cylindricity tolerance is applied to, is a cylindrical face.
4.2.7atness tolerance
A atness tolerance is a typ e of geometric tolerance that describ es the allowable tolerance
a surface may deviate from b eing at. The tolerance zone is limited by two parallel planes
separated by the distance sp ecied b y the tolerance value.
NOTE-See ISO1101:1999for denition and areas of application of this t yp e of tolerance.
EXPRESS sp ecication:
*)
ENTITY flatness_toleran ce
SUBTYPE OF (geometric_tole rance);
WHERE
WR1: NOT (’AIC_GEOMETRIC_ TOLERANCES.’+
’GEOMETRIC_TOLE RANCE_WI TH_D ATUM_ REFERENCE’ IN TYPEOF (SELF));
END_ENTITY;
(*
Formal prop ositions:
WR1: The atness tolerance shall not be of typ e geometric tolerance with datum-
reference.
12 © ISO 2000 – All rights reserved

Informal prop ositions:
IP1: The shap e asp ect,the atness tolerance is applied to, shall be a nominally planar
surface.
4.2.8line prole tolerance
A line prole tolerance is a typ e of geometric tolerance that applies to the intersection
curves b etween the surface and the planes parallel to the reference plane.
NOTE1-The tolerance zone may b e lo cated by datums.
The ideal features corresp onding to the intersection curves shall not b e linear or circular. In the
case where the intersection curves are linear or circular, straightness tolerance or round-
ness tolerance shall be used, resp ectively.There shall be another shap e asp ect,which is
related to the toleranced shap e asp ect bya shap e asp ect relationship.The name of the
shap e asp ect relationship shall be either ’aected plane asso ciation’, when the related-
shap e asp ect corresp onds to the reference plane, or ’resulting in tersection curve asso ciation’,
when the related shap e asp ect corresp onds to one of the intersection curves.
NOTE2-The reference plane can b e derived from the intersection curve and vice versa.
The tolerance zone is contained in a plane.
NOTE3-See ISO1101:1999for denition and areas of application of this t yp e of tolerance.
EXPRESS sp ecication:
*)
ENTITY line_profile_tol erance
SUBTYPE OF (geometric_tole rance);
WHERE
WR1: (NOT ((’AIC_GEOMETRI C_T OLERANCES.’+
’GEOMETRIC_TOLER ANCE_ WITH_DA TUM_R EFERENCE’)IN TYPEOF(SELF)))
OR
(SIZEOF(SELF\ge ometric_ tolerance_wi th_da tum_ reference.
datum_system)<=3);
WR2: SIZEOF(QUERY(
sar<*USEDIN(SELF\geometric_t olerance.t oleranced_ shape_a spect,
’AIC_GEOMETRIC_T OLERANCES.’+
’SHAPE_ASPECT_RE LATIONSHIP.R ELATING_SH APE_A SPECT’)|
(sar.name IN [’affected plane association’,
’resulting intersection curve association’])
))=1;
END_ENTITY;
(*
Formal prop ositions:
WR1: The line prole tolerance shall contain at most three elements in its datum system.
WR2: The toleranced shap e asp ect shall be the relating shap e asp ect of a shap e-
asp ect relationship that has a name of ’aected plane asso ciation’ or ’resulting in tersection
curve asso ciation’.
4.2.9parallelism tolerance
A parallelism tolerance is a typ e of geometric tolerance with datum reference.The
tolerance zone is limited either by:
|two par
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