Indeed it is necessary to distinguish the syntax of a

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Unformatted text preview: ws to specify functional tolerances which are difficult and even impossible to express with the writing rules of the standards. Indeed it is necessary to distinguish the syntax of a geometric tolerance, i.e. its writing on the technical drawing, and its semantics, i.e. its meaning with regard to the part. Whereas the CAD software packages try to represent the syntax of the geometric tolerances, we propose to represent their semantics. The task is then much simpler because, while the syntactic rules of the standardized tolerances are many and are badly formalized, we think that their semantics can always be interpreted in the form of a virtual gauge. Several authors have already shown this geometrical interpretation of tolerances [Jayaraman et al., 1989], [Etesami, 1991], [Nigam et al., 1993]. Some of them have tried to model it [Ballu et al., 1997], [Dantan et al., 1999]. This geometrical interpretation is also found in the American standard [ASME, 1994]. 3 J.K. Davidson (ed.), Models for Computer Aided Tolerancing in Design and Manufacturing, 3 – 12. © 2007 Springer. 4 E. Pairel, P. Hernandez and M. Giordano However we think that none of these contributions has brought as complete and...
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