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ISO/NP 25935 Geometrical product specifications (GPS) — Restrained states

Scope

This document specifies rules for restrained states.

Purpose

According to the rigid workpiece principle, all parts are by default considered rigid (i.e. having infinite stiffness) and all GPS specifications apply in a state undeformed by any external forces. While the rigid workpiece principle applies well for many industrial cases it is, however, inadequate in cases where the deformations (caused by e.g. contact with counterparts, gravity, forces, etc.) are non-negligible with respect to the part’s function. In such cases it is beneficial to specify the part in restrained state(s).

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