SIST EN 22768-2:2000
(Main)General tolerances - Part 2: Geometrical tolerances for features without individual tolerance indications (ISO 2768-2:1989)
General tolerances - Part 2: Geometrical tolerances for features without individual tolerance indications (ISO 2768-2:1989)
This part is intended to simplify drawing indications and specifies general tolerances in three tolerance classes. It mainly applies to features which are produced by removal of material. It contains tour tables and an informative annex A with regard to concepts behind general tolerancing of dimensions, as well as an informative annex B with further information.
Allgemeintoleranzen - Teil 2: Toleranzen für Form und Lage ohne einzelne Toleranzeintragung (ISO 2768-2:1989)
Tolérances générales - Partie 2: Tolérances géométriques pour éléments non affectés de tolérances individuelles (ISO 2768-2:1989)
La présente partie de l'ISO 2768 vise à simplifier les indications devant figurer sur les dessins et prescrit les tolérances géométriques générales applicables aux éléments du dessin qui ne font pas l'objet d'un tolérancement individuel. Elle prescrit des tolérances géométriques générales regroupées en trois classes de tolérance. La présente partie de l'ISO 2768 est applicable principalement aux éléments exécutés par enlèvement de matière. Son application à des éléments obtenus par d'autres procédés de fabrication est possible ; néanmoins, cela nécessite un contrôle supplémentaire pour déterminer si la précision habituelle de l'atelier demeure dans les limites des tolérances géométriques générales prescrites dans la présente partie de l'ISO 2768.
General tolerances - Part 2: Geometrical tolerances for features without individual tolerance indications (ISO 2768-2:1989)
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.General tolerances - Part 2: Geometrical tolerances for features without individual tolerance indications (ISO 2768-2:1989)Allgemeintoleranzen - Teil 2: Toleranzen für Form und Lage ohne einzelne Toleranzeintragung (ISO 2768-2:1989)Tolérances générales - Partie 2: Tolérances géométriques pour éléments non affectés de tolérances individuelles (ISO 2768-2:1989)General tolerances - Part 2: Geometrical tolerances for features without individual tolerance indications (ISO 2768-2:1989)17.040.10Tolerance in ujemiLimits and fitsICS:Ta slovenski standard je istoveten z:EN 22768-2:1993SIST EN 22768-2:2000en01-december-2000SIST EN 22768-2:2000SLOVENSKI
STANDARD
SIST EN 22768-2:2000
SIST EN 22768-2:2000
SIST EN 22768-2:2000
INTERNATIONAL STANDARD IS0 2768-2 First edition 1989-l l-15 General tolerances - Part 2: Geometrical tolerances for features without individual tolerance indications Tolhances g&&ales - Partie 2: Tohances gkomhtriques pour 6lkments non affect&s de tolkances individuelles Reference number IS0 2768-2 : 1989 (E) SIST EN 22768-2:2000
IS0 2768-2 : 1989 (El Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 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, govern- mental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 2768-2 was prepared by Technical Committee ISO/TC 3, Limits and fits. This first edition of IS0 2768-2, together with IS0 2768-l : 1989, cancel and replace IS0 2768 : 1973. IS0 2768 consists of the following parts, under the general title Genera/ tolerances: - Part tolerance for 7 : Tolerances indications linear and angular dimensions without individual - Part cations 2: Geometrical tolerances for features without individual tolerance indi- Annexes A and B of this part of IS0 2768 are for information only. 0 IS0 198s All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 l CH-1211 Gen&ve 20 l Switzerland Printed in Switzerland ii SIST EN 22768-2:2000
Iso 2768-2 : 1989 (El Introduction All features on component parts always have a size and a geometrical shape. For the deviation of size and for the deviations of the geometrical characteristics (form, orientation and location) the function of the part requires limitations which, when exceeded, impair this function. The tolerancing on the drawing should be complete to ensure that the elements of size and geometry of all features are controlled, i.e. nothing shall be implied or left to judge- ment in the workshop or in the inspection department. The use of general tolerances this prerequisite is met. for size and geometry simplifies the task of ensuring that SIST EN 22768-2:2000
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INTERNATIONAL STANDARD IS0 2768-2 : 1989 (El General tolerances - Part 2: Geometrical tolerances for features without individual tolerance indications 1 Scope This part of IS0 2768 is intended to simplify drawing indica- tions and specifies general geometrical tolerances to control those features on the drawing which have no respective in- dividual indication. It specifies general geometrical tolerances in three tolerance classes. This part of IS0 2768 mainly applies to features which are pro- duced by removal of material. Its application to features manufactured by other processes is possible; however, special examination is required to ascertain whether the customary workshop accuracy lies within the general geometrical toler- ances specified in this part of IS0 2768. 2 General When selecting the tolerance class, the respective customary workshop accuracy has to be taken into consideration, If smaller geometrical tolerances are required or larger geometrical tolerances are permissible and more economical for any individual feature, such tolerances should be indicated directly in accordance with IS0 1101 (see clause A.2). General geometrical tolerances in accordance with this part of IS0 2768 apply when drawings or associated specifications refer to this part of IS0 2768 in accordance with clause 6. They apply to features which do not have respective individual geometrical tolerance indications. General geometrical tolerances apply to all geometrical toler- ance characteristics, excluding cylindricity, profile of any line, profile of any surface, angularity, coaxiality, positional toler- ances and total run-out. In any event, general geometrical tolerances in accordance with this part of IS0 2768 should be used when the fundamental tolerancing principle in accordance with IS0 8015 is used and indicated on the drawing (see clause B. 1). 3 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of IS0 2768. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IS0 2768 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 1101 : 1983, Technical drawings - Geometrical toleranc- ing - Tolerancing of form, orientation, location and run-out - Generalities, definitions, symbols, indications on drawings. IS0 2768-l : 1989, General tolerances - Part 7 : Tolerances for linear and angular dimensions without individual tolerance indi- cations. IS0 5459 : 1981, Technical drawings - Geometrical toleranc- ing - Datums and datum-systems for geometrical tolerances. IS0 8015 : 1985, Technical drawings - Fundamental toleranc- ing principle. 4 Definitions For the purposes of this part of IS0 2768, the definitions for geometrical tolerances given in IS0 1101 and IS0 5459 apply. 5 General geometrical tolerances (see also clause B. 1) 5.1 Tolerances for single features 5.1 .l Straightness and flatness The general tolerances on straightness and flatness are given in table 1. When a tolerance is selected from table 1, it shall be based, in the case of straightness, on the length of the cor- responding line and, in the case of flatness, on the longer lateral length of the surface, or the diameter of the circular sur- face. 1 SIST EN 22768-2:2000
IS0 2768-2 : 1989 (I3 Table 1 - General tolerances on straightness 5.2.3 Perpendicularity and flatness Values in millimetres Straightness and flatness tolerances for ranges of nominal lengths Toler- ance class The general tolerances on perpendicularity are given in table 2. The longer of the two sides forming the right angle shall be taken as the datum; if the sides are of equal nominal length, either may be taken as the datum. Table 2 - General tolerances on perpendicularity Values in millimetres 0,oz 1 0,05 ) 0,l 1 0,2 ) 0,3 1 0,4 0,05 ) 0,l 1 0,2 ) 0,4 1 0,6 1 Ok3 H Perpendicularity tolerances for ranges of nominal lengths of the shorter side up to loo I over 100 over 300 over 1 000 up to 300 up to 1 ooo up to 3 ooo K Toler- ance class H K L w I 02 1 0,4 ) 0,8 1 I,2 ) 1,6 L 0,2[ 0,3 ( 0,4 1 0,5 014 I 0,6 I 018 I 1 5.1.2 Circularity (46 1 115 2 The general tolerance on circularity is equal to the numerical value of the diameter tolerance, but in no case shall it be greater than the respective tolerance value for circular radial run-out given in table 4 (see examples in clause B.2). 5.2.4 Symmetry The general tolerances on symmetry are given in table 3. The longer of the two features shall be taken as the datum; if the features are of equal nominal length, either may be taken as the datum. 5.1.3 Cylindricity General tolerances on cylindricity are not specified. NOTE - The general tolerances on symmetry apply where - at least one of the two features has a median plane, or - the axes of the two features are perpendicular to each other. See examples in clause B.5. NOTES 1 The cylindricity deviation comprises three components : circularity deviation, straightness deviation and parallelism deviation of opposite generator lines. Each of these components is controlled by its in- dividually indicated or its general tolerance. Table 3 - General tolerances on symmetry Values in millimetres 2 If, for functional reasons, the cylindricity deviation has to be smaller than the combined effect (see clause B.3) of the general tolerances on circularity, straightness and parallelism, an individual cylindricity toler- ance in accordance with IS0 1101 should be indicated for the feature concerned. 1 Toler- 1 Symmetry tolerances for ranges of nominal lengths ante class to loo over 100 over 300 over 1 000 up up to 300 up to 1 ooo up to 3 ooo \ Sometimes, e.g. in the case of a fit, the indication of the envelope requirement 0 E is appropriate. I H I I W3 1 I L I W 1 I L5 I 2 5.2 Tolerances for related features 5.2.1 General 5.2.5 Coaxiality The tolerances specified in 5.2.2 to 5.2.6 apply to all features which are in relation to one another and which have no respec- tive individual indication. General tolerances on coaxiality are not specified. NOTE - The deviation in coaxiality may, in an extreme case, be as great as the tolerance value for circular radial run-out given in table 4, since the deviation in radial run-out comprises the deviation in coaxial- ity and the deviation in circularity. 5.2.2 Parallelism The general tolerance on parallelism is equal to the numerical value of the size tolerance or the flatness/straightness toler- ance, whichever is the greater. The longer of the two features shall be taken as the datum; if the features are of equal nominal length, either may be taken as the datum (see clause B.4). 5.2.6 Circular run-out The general tolerances on circular run-out (radial, axial and any surface of revolution) are given in table 4. 2 S
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