BS ISO 10579:2010 pdf free download Geometrical product specifications (GPS) — Dimensioning and tolerancing — Non-rigid parts
1Scope
This International Standard gives rules for dimensioning and tolerancing non-rigid parts where restraining offeatures is required during verification of dimensions and tolerances specified on a drawing.
2Normative references
The following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies. For undated references, the latest edition of the referenceddocument (including any amendments) applies.
ISO1101:2004,Geometrical Product Specifications(GPS)—Geometrical tolerancing —Tolerances of form,orientation,location and run-out
Terms and definitions
For the purposes of this document, the following terms and definitions apply.3.1
non-rigid part
part which deforms to an extent that in the free state is beyond the dimensional and/or geometrical toleranceson the drawing
3.2
free state
condition of a part subjected only to the force of gravity
4Basic principles
The distortion of a non-rigid part must not exceed that which allows the part to be brought within specifiedtolerances for verification and positioning at assembly,or assembled, by applying pressure or forces notexceeding those which can be expected under normal assembly conditions. t is impossible to avoid the effectof natural forces such as gravity, but the extent of distortion may depend upon the orientation of the part andcondition of the part in the free state. If it is necessary to indicate the tolerance in the free state, the conditionsunder which the tolerance is to be achieved (i.e. the direction of gravity,conditions in which it is to besupported, etc.) may have to be indicated in a note, as shown in Annex A.For non-rigid parts, identified on thedrawing by the added statement “ISO10579-NR” , the restrained condition applies unless the dimensions andtolerances are qualified by the symbol O, see Clause 5.
5 Indications on drawings
Drawings of non-rigid parts shall include the following indications as appropriate (see also Annex A):
a) in or near the title block, the indication “ISO 1 0579-NR”;
b) in a note, the conditions under which the part shall be restrained to meet the drawing requirements;
c) geometrical tolerances allowed in the free state, with the modifying symbol included in the tolerance frame in accordance with ISO 1 1 01 ;
d) dimensional tolerances allowed in the free state, with the modifying symbol after the dimensional
tolerance;
e) the conditions under which the geometrical tolerance under free state is achieved, such as direction of gravity, orientation of the part, etc.