Virtual gauge representation for geometric tolerances in CAD-CAM systems.

Eric Pairel (1) , Pascal Hernandez (1) , Max Giordano (1)

1 SYMME - Laboratoire SYstèmes et Matériaux pour la MEcatronique

The CAD software seeks to represent the syntax of the geometric tolerances, i.e. their writing on the drawings. We propose to represent their semantics, i.e. their meaning with respect to the part. We show that the meaning of the geometric tolerances can be defined thanks to a model of virtual gauges. These gauges concern geometrical entities of the part which are represented on the three-dimensional geometrical model of the part (CAD model). The topology of a gauge is related to that of the part. Recording these attributes is sufficient. The advantages of this representation are its simplicity, the semantic coherence which can be guaranteed, the independence from the standards, their limits and their evolutions, and the extension of the tolerancing possibilities for the designer.

Mots clés: Tolerancing; Virtual gauge; CAD-CAM

Domaines: Génie mécanique [physics.class-ph]; Génie mécanique [physics.class-ph]

Eric Pairel, Pascal Hernandez, Max Giordano. Virtual gauge representation for geometric tolerances in CAD-CAM systems.. J.K. Davidson. Models for Computer Aided Tolerancing in Design and Manufacturing, Springer, pp.3-12, 2007. ⟨hal-00638011⟩