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है”ह”ह

IS 13099 (2001): Geometrical Product Specifications ( GPS )- Geometrical Tolerancing - Positional Tolerancing [PGD 24:Drawings]

I

Is 13099: 2001ISO 5458:1998

Indian Standard

GEOMETRICAL PRODUCT SPECIFICATIONS(GPS)– GEOMETRICAL TOLERANCING —

POSITIONAL TOLERANCING

( First Revision)

Ics 17,040.10

@ BIS 2001

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

December 2001 Price Group 6

Drawings Sectional Committee, BP 24

NATIONAL FOREWORD

This Indian Standard ( First Revision ) which is identical with ISO 5458:1998 ‘Geometrical productspecifications ( GPS ) — Geometrical tolerancing — Positional tolerancing’ issued by the InternationalOrganization for Standardization ( ISO ) was adopted by the Bureau of Indian Standards on the recommendationof Drawings Sectional Committee and approval of the Basic and Production Engineering Division Council.

This standard was originally published in 1991 and was based on ISO 5458 : 1987 ‘Technicaldrawings — Geometrical tolerancing — Positional tolerancing’. This revision has been taken up toharmonize with the latest version of International Standard ISO 5458, which has been technically revised.

This standard describes positional tolerancing. This tolerancing method is applied to the location of apoint, of a line nominally straight and of a surface nominally plane, for example the centre of a sphere,the axis of a hole, or shaft and the median surface of a slot.

The text of ISO Standard has been approved as suitable for publication as Indian Standard withoutdeviations. In this adopted standard, certain terminology and conventions are not identical to thoseused in Indian Standards. Attention is especially drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should beread as ‘Indian Standard’.

b) Comma ( , ) has been used as a decimal marker while in Indian Standards, the current practiceis to use a full point ( . ) as the decimal marker.

In this adopted standard, reference appears to the following International Standard for which IndianStandard also exists. The corresponding Indian Standard, which is to be substituted in its place, islisted below along with its degree of equivalence for the edition indicated:

International Standard Corresponding Indian Standard Degree of Equivalence

1s0 11011) IS 8000 ( Part 1 ) :19852) Geometri- ldentica12)cal tolerancing on technical drawings:Part 1Tolerances of form, orientation,location and run-out, and appropriategeometrical definitions ( first revision)

This adopted standard also gives Bibliography in Annex D, which is informative. The correspondingIndian Standards against the International Standards are given below along with their degree of equivalencefor the editions indicated:

International Standard Corresponding Indian Standard Degree of Equivalence

1s0 1660 : 1987 Technical IS 8000 ( Part 3 ) :1992 Technical Identicaldrawings — Dimensioning and drawings — Geometrical tolerancing:tolerancing of profiles Part 3 Dimensioning and tolerancing

of profiles ( second revision)

‘) To be published ( Revision of ISO 1101 :1983 ).

‘) IS 8000 ( Part 1 ) :1985 is the adoption of ISO 1101 :1983.

( Continued on third cover)

IS 13099:2001ISO 5458:1998

Indian Standard

GEOMETRICAL PRODUCT SPECIFICATIONS(GPS)– GEOMETRICAL TOLERANCING —

POSITIONAL TOLERANCING

( First Revision)

1 Scope

This International Standard describes positional tolerancing. This tolerancing method is applied to the location of apoint, of a line nominally straight and of a surface nominally plane, e.g. the centre of a sphere, the axis of a hole orshaft and the median surface of a slot.

NOTE Profile tolerancing is used when lines are not intended to be straight or surfaces are not intended to lie in a plane;see ISO 1660.

2 Normative reference

The following standard contains provisions which, through reference in this text, constitute provisions of thisInternational Standard. At the time of publication, the edition indicated was valid. All standards are subject torevision, and parties to agreements based on this International Standard are encouraged to investigate thepossibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintainregisters of currently valid International Standards.

1s01lol:—1),Ge~metri@productspecifications (GPS) — Geometrical tolerancing — Generalities, definfikms

symbols, indication on drawings.

3 Definitions

Definitions related to features are under development and will be issued as ISO 14660-1. This work will result innew terms that are different from those used in this International Standard. These new terms are defined in annex Aand appear in the main body of this International Standard in parentheses next to the currently used term.

4 Establishment of positional tolerances

4.1 General

The primary constituents are theoretically exact dimensions, tolerance zones and datums.

4.2 Fundamental requirement

Positional tolerances are associated with theoretically exact dimensions and define the limits for the location ofactual (extracted) features, such as points, axes, median surfaces, nominally straight lines and nominally planesurfaces relative to each other or in relation to one or more datums. The tolerance zone is symmetrically disposedabout the theoretically exact location.

‘) To be published. (Revision of ISO 1101:1 983)

1

IS 13099:2001ISO 5458:1998

NOTE Positional tolerances do not accumulate when theoretically exact dimensions are arranged in a chain (see figure 4).~hiscontrasts with dmensional tolerances that prearranged inachain.) Positional tolerancing allows clear reference to bemade to one or more datums.

4.3 Theoretically exact dimensions

Theoretically exact dimensions, both angular and linear, are indicated by being enclosed in a rectangular frame inaccordance with ISO 1101. This is illustrated in figures 2 a), 2 b), 3 a), 4 a), 5 a) and 7 a).

The theoretically exact dimensions 0° and 90°, 180° or distance O between

— positionally tolerance features not related to a datum [see figure 4 a) and figure 5 a)],

— positionally tolerance features related to the same datum(s) [see figure 2 a)],

— positionally tolerance features and their related datums (see figure 1),

are implied without specific indication,

When the positional tolerance features share the same centreline or axis they are regarded as theoretically exactlyrelated features, unless otherwise specified, e.g. in relation to different datums or other reason indicated by anappropriate note on the drawing as shown in figure 2 b).

Indicationon the drawing Explanation

@ ,. O+/ -t-F

“--’’+”+a) b) c)

‘-id)

Cases a), b), c) or d) may apply at each individual hole:

a) axis of hole coincident with theoretically exact location(zero deviation);

b) axis of hole at maximum position deviation with zeroperpendicularity deviation;

c) axis of hole at maximum position deviation with maximumperpendicularity deviation;

d) axis of hole at maximum position deviation; in this case acombination of geometrical deviations.

Figure1

2

A.

IS 13099:2001ISO 5458:1998

4.4 Positional tolerances onacomplete circle

When positionally tolerance features are arranged in a complete circle it is understood that the features are equallyspaced, unless otherwise stated, and that their locations are theoretically exact.

If two or more groups of features are shown on the same axis, they shall be considered to be a single pattern when

— they are not related to a datum;

— they are related to the same datum or datum system (datums in the same order of precedence or under thesame material conditions) [see figure 2 a)];

unless otherwise stated [see figure 2 b)].

Figure 2a)

I Angular locationoptional

Figure 2 b)

,.

3

IS 13099:2001ISO 5458:1998

4.$ Directions of positional tolerances

4.5. I positional tolerances in one direction only

The tolerance value can be specified in one direction. The orientation of the width of the tolerance zone is based onthe pattern of the theoretically exact dimensions and is at 0° or 90° as indicated by the direction of the arrow line[see figures 3a) and 3 b)] unless otherwise indicated.

Indication on the drawing

Key

Figure 3a)

Explanation

.. -

1 Simulated datum A2 Simulated datum B

Each of the scale lines shall be contained within a tolerance zone defined by two parallel straight lines 0,1 apart which aresymmetrically dkposed about the theoretically exact position of each scale line relative to each other.

Figure 3 b)

IS 13099:2001ISO 5458:1998

4.5.2 Positional tolerances intwo directions

The tolerance value can be specified in two directions perpendicular to each other, reference being made tounequal values [see figures 4 a) and 4 b)] or equal values.

Indication on the drawing

+I

I--l-d+-$-+b---+k‘W-4-4--4-

•i El El

Figure4a)

Explanation

30

k

0,3

I 30 30 30i–

Figure4 b)

The rectangular pattern consisting of the eight tolerance zones, placed 30 mm apart from each other, is a floatingone, the location and orientation of which depends on the considered actuai (extracted) features of the workpiece.

Each of the holes shall be:

—

—

—

measured in the direction of the theoretically exact dimension 30; its actual (extracted) median surface lieswithin a tolerance zone with a rectangular cross section 0,3x actual length of the feature;

measured in the direction of the theoretically exact dimension 28; its actual (extracted) median surface lieswithin a tolerance zone with a rectangular cross section 0,1 x actual length of the feature;

the median planes of the tolerance zones are fixed by theoretically exact dimensions.

5

IS 13099:2001ISO 5458:1998

4.5.3 Multi-directional positional tolerances

The tolerance is specified as a cylindrical zone [see figures 5a) and 5 b)]. The “rigid rectangular pattern” consistingof the eight tolerance zones, placed 30 mm apart from each other, may be implied by a best fit (rotations andtranslations) to the centre pointAine data from the actual (extracted) features of the workpiece.

Indication on the drawing

8.010e10 0,1]

1p-+”--+--”

c1

0 im

t .— .—0

.—-+

❑ El El

Figure 5a)

Explanation

r’””.——.—.—.—

‘~1The actual (extracted) axis of each hole shall lie within a cylindrical tolerance zone of diameter 0,1 mm; the axes of thecylindrical tolerance zones are fixed by theoretically exact dimensions.

Figure 5 b)

NOTE For cylindrical features of mating parts, the tolerance zone is usually cylindrical, as the positional tolerance ismulti-directional from the theoretically exact location. In these cases the positional tolerancing method achieves a largertolerance zone than in the two directions method which can only generate a square (or rectangular) two dimensional tolerancezone; see figure 6. The choice between “multi-directional” and “in two directions” tolerance zone should be made according tothe function of the tolerance feature.

Key

1 5770 larger zoneFigure 6

6

A.

IS 13099:2001ISO 5458:1998

5 Tolerance combinations

5.1 If agroupof features isindividually located bypositional tolerancing andtheir patiern location is also locatedby positional tolerancing, each requirement shall be met independently [see figure 7 a)].

5,2 The actual (extracted) axis of each of the four holes shall lie within the cylindrical tolerance zone of diameter0,01; the positional tolerance zones are located in their theoretically exact positions to each other and perpendicularto datum A [see figure 7 b)],

5.3 The actual (extracted) axis of each holes shall lie within the cylindrical tolerance zone of diameter 0,2; thepositional tolerance zones are perpendicular to datum A and located in their exact theoretical positions in relation toeach other and to the datums B and C [see figure 7 c)].

Key

1 Simulated datum A

PA

Indication on the drawing

4.015

00,2 IAIBIcI00,011 Al

Figure 7a)

Explanation

1

‘i--1-r. .—.—00,01

l---=-l /

3 3

Key

1 Simulated datum A2 Simulated datum B3 Simulated datum C

Figure 7 b) Figure 7 c)

7

J+

Is 13099:2001ISO 5458:1998

Annex A(informative)

Definitions

For full details, see ISO 14660-1.

featurepoint, line or surface

integral featuresurface or line on a surface

derived featurecentre point, median line or median surface derived from one or more integral features

feature of sizegeometric shape defined by a linear dimension which is a size

nominal integral featuretheoretically exact integral feature as defined by a technical drawing or by other means

nominal derived featurecentre point, median straight line or median plane derived from one or more nominal integral features

real surface of a workpieceset of features which physically exist and separate the entire workpiece from the surrounding medium

real (integral) featureintegral feature part of a real surface of a workpiece limited by the adjacent real (integral) features

extracted integral featureapproximated representation of the real (integral) feature, obtained by extracting a finite number of points from thereal (integral) feature

NOTE This extraction is petiormed in accordance with specified conventions.

extracted derived featurecentre point, median line or median surface derived from one or more extracted integral features

associated integral featureintegral feature of perfect form associated to the extracted integral feature in accordance with specified conventions

associated derived featurecentre point, median straight line or median plane derived from one or more associated integral features

J+

IS 13099:2001ISO 5458:1998

Annex B(informative)

Former practice

The former practice involved individually locating a group of features by positional tolerancing and their patternlocation by coordinate tolerances (see figure 6.1).

Indication on the drawing

~+

*

Figure B.1

Such a practice is no longer recommended, because the meaning of the tolerance distances 16 t 0,5 and 18 & 0,5is not standardized. The tolerancing according to clause 5 should be used instead.

IS 13099:2001ISO 5458:1998

Annex C(informative)

Relation to the GPS matrix model

For full details about the GPS matrix model, see lSO/TR 14638.

C.1 Information about this International Standard and its use

This International Standard defines the methods for the indication of positional tolerances on technical drawings. Italso further elaborates the concepts of positional tolerancing as described in ISO 1101.

C.2 Position in the GPS matrix model

This International Standard is a Generai GPS standard, which influences chain links 1 and 2 of the chain ofstandards on location in the Genera/ G/JS matrix, as graphically illustrated in figure C.1.

Fundamental

GPS

standards

Global GPS standards I

General GPS matrix

Chain link number 1 2 3 4 5 6

Size

Distance

Radius

Angle

Form of line independent of datum

Form of line dependent on datum

Form of surface independent of datum

Form of surface dependent on datum

Orientation

Location ‘,, ,. ~ , ;;....

Circular run-out

Total run-out

Datums

Roughness profile

Waviness profile

Primary profile

Surface imperfections

Edges

FigureC.1

C.3 Related International Standards

The related International Standards are those of the chains of standards indicated in figure C.1.

[1]

[2]

[3]

[4]~

[5]

[6]

1s0

IS 13099:2001

ISO 5458:1998

Annex D(informative)

Bibliography

660:1987, Technical drawings — Dimensioning and tolerancing of profiles.

ISO 2692:1988, Technical dra wings — Geometrical tolerancing — Maximum material principle.

ISO 3098-1 :—2),. Technics/drawings — Lettering — Part 1: Latin alphabet, numerals and marks.

ISO 5459:1981, Technical dra wings — Geometrical tolerancing — Datums and datum-systems for geometric/tolerances.

lSO/TR 14638:1995, Geometrical product specifications (GPS) — Masterplan.

ISO 14660-1:—3), Geometrical product specification (GPS) — Geometric features — Part 1: General termsand definitions.

11

( Continued from second cover)

/nternationa/Standard Corresponding Indian Standard Degree of Equivalence

ISO 2692:1987 Technical drawings — IS 8000 ( Part 2 ) :1992 Technical Identical

Geometrical tolerancing — Maximum drawings — Geometrical tolerancing:

material principle Part 2 Maximum material principle( first revision)

ISO 3098-11, Technical drawings — IS 9609 ( Part 1 ) : 19832) LetteringLettering — Part 1 : Latin alphabet, on technical drawings : Part 1numerals and marks English lettering ( first revision)

Cjoz)

1, To be published ( Revision of ISO 3098-1: 1974).

2, IS 9609 ( Part 1 ) :1983 is the adoption of ISO 3098-1:1974.

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards A et, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goods andattending to connected matters in the country.

Copyright

BIS has the copyright of al 1its publications. No part of these publications may be reproduced in any form withoutthe prior permission in writing of BIS. This does not preclude the free use, in the course of implementing thestandard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating tocopyright be addressed to the Director (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewedperiodically; a standard along with amendments is reaffirmed when such review indicates that no changes areneeded; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standardsshould ascertain that they are in possession of the latest amendments or edition by referring to the latest issueof ‘BIS Catalogue’ and ‘Standards : Monthly Additions’,

This Indian Standard has been developed from Doc : No. BP 24 ( 0198 ).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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