ISO 10579-2010 pdf download.Geometrical product specifications (GPS)一Dimensioning and tolerancing一 Non-rigid parts.
This International Standard gives rules for dimensioning and tolerancing non-rigid parts where restraining of features is required during verification of dimensions and tolerances specified on a drawing.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1101:2004. Geometrical Product Specifications (GPS) — Geometrical tolerancing — Tolerances of form. orientation, location and run-out
3 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 tolerances on the drawing
3.2 free state
condition of a part subjected only to the force of gravity
4 Basic principles
The distortion of a non-rigid part must not exceed that which allows the part to be brought within specified tolerances for verification and positioning at assembly, or assembled, by applying pressure or forces not exceeding those which can be expected under normal assembly conditions. It is impossible to avoid the effect of natural forces such as gravity, 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 to indicate the 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 drawing by the added statement ISO 10579-NR”, the restrained condition applies unless the dimensions and tolerances are qualified by the symbol D, see Clause 5.ISO 10579 pdf download.