The assembly in figure 1 has all the six types of

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Unformatted text preview: a part with n vertices, the algorithm computes the most accurate tolerance envelope in O(nm2) space and O(nm2logm) time. Figure 2(b) shows the tolerance envelope of part P3. 2.2. Relative position of two parts The relative position of one part with respect to another is modeled with contact and clearance constraints. These constraints specify the location of the part boundaries with respect to each other, or with respect to a reference datum. For planar parts consisting of line and arc segments, the constraints describe how to position a part feature (vertex, edge, or arc) with respect to another one or with respect to a datum (line). The variability of the feature parameters determines the variability of the relative position of parts in the assembly. We have identified six types of relative position constraints that describe all types of contact and clearance constraints, including simultaneous contacts. The constraints yield the possible variation in the position of part B (the free part) relative to part A (the fixed p...
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This note was uploaded on 08/03/2010 for the course DD 1234 taught by Professor Zczxc during the Spring '10 term at Magnolia Bible.

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