Unformatted text preview: d (3, 3) from the tolerance box in Figure 7. Processing uc,2 ﬁrst yields ∆u = (3, 0), whereas processing it second yields ∆u = (3, 2). Tolerance Synthesis of Higher Kinematic Pairs 297 Figure 8; Detail of Geneva pair contact zone: (a) initial; (b) ﬁnal. 4. RESULTS We have tested the tolerance synthesis algorithm on common higher pair systems from the engineering literature. We present two representative examples where it corrects kinematic problems in the initial tolerances by changing the nominal parameter values. The ﬁrst example is the 26 parameter model of the Geneva pair (Figure 1) whose contact zone shows possible jamming (Figure 8a). In the ﬁrst synthesis iteration, step 1 of candidate selection ﬁnds 44 maximal parameter sets and step 2 generates 137 parameter vectors. Candidate testing ﬁnds 21 vectors with incorrect kinematic function. There are three more iterations in which ﬁve, two, and one incorrect vectors are found. The maximum change is 0.00322 which is 8% of the tolerance...
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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.
- Spring '10
- The Land