Conception and Representation of GD & T Module in an Expert CAPP System for Rotational Parts

Computer-aided process planning (CAPP) is an essential interface for linking design and manufacturing processes. The purpose of CAPP is to transform a part design specification obtained from CAD system into a sequence of machining operations which can be used by CAM system involving the selection of necessary manufacturing processes, in order to transform a designed part into a final part economically and competitively. This paper focuses on one hand, in the extraction of tolerances (GD& T), and on the other hand, in the association between (GD& T), and the related features, embedded into an expert CAPP system.