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1、INTERNATIONAL STANDARD IS0 10579 First edition 1993-02-01 Technical drawings - Dimensioning and tolerancing - Non-rigid parts Dessins techniques - Cotation et to/ but the extent of distortion may depend upon the orientation of the part and condition of the part in the free state. If it is necessary
2、to indicate the geo- metrical tolerance in the free state, the conditions under which the tolerance is to be achieved (i.e. the direction of gravity, conditions in which it is to be supported, etc.) may have to be indicated in a note, as shown in annex A. For non-rigid parts, identified on the drawi
3、ng by the added statement “IS0 10579-NR”, the restrained condition applies unless the dimensions and tolerances are qualified by the symbol 0, see clause 5. 5 Indications on drawings Drawings of non-rigid parts shall include the follow- ing indications as appropriate (see also annex A): a) in or nea
4、r the title block, the indication “IS0 10579-NR”; b) in a note, the conditions under which the part shall be restrained to meet the drawing require- ments; c) geometrical variations allowed in the free state, with the modifying symbol included in the tolerance frame in accordance with IS0 1101; d) t
5、he conditions under which the geometrical tol- erance under free state is achieved, such as di- rection of gravity, orientation of the part, etc. IS0 10579:1993(E) Annex A (informative) Examples of indication and interpretation Indication on the drawing Itl21AIBt- Interpretation ZTL 1 The geometrica
6、l tolerance, followed by the symbol 0, shall be ensured in the .-.- .- free state. Other geometrical tolerances I apply under the conditions indicated in the note. SO 10579-NR iestrained condition: The surface indicated as datum A is mounted (with S4 bolts M6 tightened to a torque of 9 N-m to 15 N-m
7、) and the feature indi- sated as datum 8 is restrained at the corresponding maximum material limit. lndlcatlon on the drawlng lnterpretatlon 0 Gravity direction The geometrical tolerances, followed by the symbol 0, shall be ensured in the free state. Other geometrical tolerances apply under the cond
8、itions indicated in the note. IS0 10579-NR Restrained condition: The surface indicated as datum A is mounted (with 120 bolts M20 tightened to a torque of 16 N*m to 20 N.m) and the feature indicated as datum B is restrained at the corresponding maximum material limit. 2 IS0 10579:1993(E) Annex 6 (inf
9、ormative) Bibliography I IS0 2692:1988, Technical drawings - Geometrical tolerancing - Maximum material principle. S IS0 5459:1981, Technical drawings - Geometrical tolerancing - Datums and datum-systems for geo- metrical tolerances. S IS0 5458:1987, Technical drawings - Geometrical tolerancing - Positional tolerancing. IS0 10579:1993(E) UDC 744.42i621.753.1 IMSWipfOrS: drawings, technical drawlngs, dlmenslonlng, dimensional tolerances, geometrical tolerances. Price based on 3 pages