A model for a coherent and complete tolerancing process

Abstract

Few CAD/CAM software in mechanical engineering offer to the designer integrated tools for 3D tolerance analysis and synthesis. For tolerance analysis and synthesis, they have to take into account geometrical specification data, but each software consider a specific geometrical specification representation. Moreover, this representation is often unknown from the users. Consequently, it is very difficult to understand the models used, the mechanisms implemented and the results provided. GeoSpelling model, a complete and coherent tolerancing process, including tolerance analysis, is presented. GeoSpelling, proposed to ISO for rebuilding standards in the fields of tolerancing and metrology, allows a unified description of the nominal and the non ideal geometry. It allows also a unique mathematical parameterization of the geometry. The proposed approach should help researchers and engineers to better explain the tolerance representation for different activities in a tolerancing process. © 2007 Springer.