To avoid this the constraints must be feasible under

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Unformatted text preview: ly parallel edges. In the nominal case, two parallel edges make contact in a line segment; in toleranced assemblies, the contact is usually a point. For example, consider parts P1 and P5 in Figure 1. The design intent is to make Positioning of Planar Parts in Toleranced Assemblies 69 contact between both pairs of edges: first with the horizontal edges (which are wider and therefore provide more stable contacts), then with the vertical edges. The former edges are termed the primary mating edges, and the latter two are termed the secondary mating edge and the conditional edge (the conditional edge is typically the shorter edge). The secondary contact is generally between the secondary mating edge and a vertex of the conditional edge, but which vertex makes contact depends on the instance of the parts. For example, if the vertical edge of P1 leans to the right and P5 is nominal, then the upper vertex of P5 will be in contact; else, when the edge leans to the left, the lower vertex will be in contact. 6. conditional arc-arc constraint (1): this constraint is used to specify contact betw...
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