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Unformatted text preview: ne major functional requirements and technical requirements. Moreover, the technical functional analysis allows determining the geometrical functional requirements, which limit the functional Manage Tolerances during Product and Process Design 57 characteristics of the mechanism. The geometrical functional requirements may be definied at the higher level. To express the geometrical functional requirement and to analyze it by graphs, a joints graph (Figure 1) modelizes the structure of the mechanism; each vertex represents part and each edge between two vertexes represents a cinematic joint. For the needs of tolerancing, the cinematic joint must be decomposed into elementary joints between surfaces [Ballu et al, 1999], [Marguet et al, 2001], [Dantan et al, 2003]. The contact graph (Figure 1) is an extension of the joints graph; each vertex represents a part, each pole of a vertex represents a surface of the corresponding part and each edge between two poles represents an elementary joint. A re...
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