Overview
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Jean-Hugues MARCHÈSE: Lecturer in Mechanical Engineering at the IUT of Aix-en-Provence - Member of the Métrologie Grand Sud association
INTRODUCTION
The development of subcontracting, the multiplication of national and international exchanges and the introduction of quality assurance systems have highlighted the need for a common, unambiguous language recognized by all partners to define product specifications.
The ISO/TR 14638 report states:
"GPS (Geometrical Products Specification) consists in defining, through a definition drawing, the shape, dimensions and surface characteristics of a part that ensure its optimum functioning, as well as the dispersion around this optimum for which the function is always satisfied.
The manufacturing process will produce real parts, which are not perfect, with deviations from the optimum on the one hand, and from part to part on the other.
These actual parts will be measured to compare them with the specification.
It is necessary to be able to connect :
the room imagined by the designer;
the actual part manufactured ;
knowledge of the part obtained by measurement.
To enable this relationship to take place and to allow mutual understanding, standards have been developed in the GPS field, covering basic definitions, symbolic representation, measurement principles, etc.".
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Geometric product specification (GPS)
Bibliography
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Standardization
In order to delve deeper into this subject, it seems essential to refer to current standards. They evolve rapidly, and new ones are regularly adopted. To keep abreast of developments, we recommend consulting the Afnor website, where a list of international, European and French standards is kept up to date.
- Geometric Product Specification (GPS) – Master plan. - CR ISO/TR 14638 - (oct. 1996)
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Websites
•Afnor website : http://www.afnor.fr
•ISO website : http://www.iso.ch
•Geometric tolerancing – F. SCHNEIDER IUFM de Lorraine, Université de Metz – [email protected]
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