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2024 | OriginalPaper | Chapter

12. Geometrical Specification for Non-rigid Parts

Author : Stefano Tornincasa

Published in: Technical Drawing for Product Design

Publisher: Springer International Publishing

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Abstract

In the absence of other indications, all the specified dimensions and tolerances are applied and controlled without the action of any force, except gravity, but components such as thin metal and flexible parts, rubber gaskets, and flexible parts in general, can deform or bend, even as just a result of their weight. These components should be inspected under a restrained condition in order to simulate their shape in the installed condition. The restraint or force on the non-rigid parts is usually applied in such a manner as to resemble or approximate the functional or mating requirements. According to the ISO standards, the non-rigid parts should be identified on a drawing by means of “ISO 10579-NR” (Non Rigid) obligatory indications within or near the title block; such a note indicates that the part is not considered rigid and it indicates the clamping forces or other requirements necessary to simulate the assembly conditions. In order to invoke a restrained condition in the ASME standards, a general note, or a local note, should be specified or referenced on the drawing to define the restraint requirements. When a general note invokes a restrained condition, all the dimensions and tolerances apply in the restrained condition, unless they are overridden by a “free state” Ⓕ symbol.

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Literature
1.
go back to reference ISO 10579:2010 Geometrical product specifications (GPS)—dimensioning and tolerancing—non-rigid parts ISO 10579:2010 Geometrical product specifications (GPS)—dimensioning and tolerancing—non-rigid parts
2.
go back to reference ASME Y14.5:2018 Dimensioning and tolerancing. Engineering product definition and related documentation practices. American Society of Mechanical Engineers, New York ASME Y14.5:2018 Dimensioning and tolerancing. Engineering product definition and related documentation practices. American Society of Mechanical Engineers, New York
3.
go back to reference Fischer BR (2009) The journeyman’s guide to geometric dimensioning and tolerancing: GD&T for the new millennium. Advanced Dimensional Management Press Fischer BR (2009) The journeyman’s guide to geometric dimensioning and tolerancing: GD&T for the new millennium. Advanced Dimensional Management Press
Metadata
Title
Geometrical Specification for Non-rigid Parts
Author
Stefano Tornincasa
Copyright Year
2024
DOI
https://doi.org/10.1007/978-3-031-51187-5_12

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