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2024 | OriginalPaper | Chapter

5. Interdependence Between Dimensions and Geometry

Author : Stefano Tornincasa

Published in: Technical Drawing for Product Design

Publisher: Springer International Publishing

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Abstract

In ISO GPS terminology, the maximum material requirement, (MMR) and least material requirement (LMR) represent two of the fundamental rules on which geometrical dimensioning with tolerances is based, and which are the subject of the ISO 2692 standard. The designer, when establishing a maximum or least material requirement, defines a geometrical feature of the same type and of perfect form, which limits the real feature on the outside of or inside the material. MMR is used to control the assemblability of a workpiece while LMR is used to control a minimum distance or a minimum wall thickness. This chapter also introduces the Reciprocity requirement (RPR) and the “zero tolerance” concepts and offers practical examples to guide a designer in his/her choice of the correct requirement from the geometrical tolerance specifications.

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Footnotes
1
This increase is generally called bonus in the ASME standard.
 
Literature
1.
go back to reference ISO 2692:2021 Geometrical product specifications (GPS)—Geometrical tolerancing—maximum material requirement (MMR), least material requirement (LMR) and reciprocity requirement (RPR) ISO 2692:2021 Geometrical product specifications (GPS)—Geometrical tolerancing—maximum material requirement (MMR), least material requirement (LMR) and reciprocity requirement (RPR)
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, USA ASME Y14.5:2018 Dimensioning and tolerancing. Engineering product definition and related documentation practices. American Society of Mechanical Engineers. New York, USA
Metadata
Title
Interdependence Between Dimensions and Geometry
Author
Stefano Tornincasa
Copyright Year
2024
DOI
https://doi.org/10.1007/978-3-031-51187-5_5

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