Gt specification during this phase the designer

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Unformatted text preview: operations that are dual between the groups. Such one-to-one mapping provides an integrated view of the tolerancing problem. An open issue is the development of methodologies and tools which allow the efficient application of such principles and operations. They can not disregard the tolerances representation within the design systems, in particular within the threedimensional CAD software packages, that are used during the design intent definition. Many tolerance representation models have been studied and proposed aimed at supporting the different product development stages. As reported in literature [Kandikjian et al., 2001], they can be classified as follows: documentation oriented, analysis oriented, production oriented and control oriented. From the CAD modeling viewpoint, the use of feature-based approach has been largely investigated. For example an interesting method to link dimensioning and tolerancing schemes in CAD systems, based on graph representation, has been described in [Shah et al., 1998]. A feature classification (atomic, primitive and compound) has been defined as the base to implement a tolerancing module in [Gao et al., 19...
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