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Unformatted text preview: and diagonal channels meet. Some parameter vector might yield a conﬁguration space in which the lower and upper contact curves intersect, block the channel, and cause the mechanism to jam. Figure 2 illustrates this failure mode. But contact zone overlap does not guarantee a faulty parameter vector. The contact zone is a conservative estimate of kinematic variation that ignores dependencies between contacts 292 M.-H. Kyung and E. Sacks Figure 2; Geneva failure: (a) jamming conﬁguration; (b) conﬁguration space. due to shared tolerance parameters. Hence, there might be no parameter vector that moves both curves into the overlap region. The tolerance synthesis algorithm resolves this issue by analyzing vectors that maximize the variation of the contacts whose zones overlap. 3. TOLERANCE SYNTHESIS ALGORITHM This section describes the tolerance synthesis algorithm, which is summarized in Figure 3. The input system consists of planar higher pairs with parametric tolerances. The part proﬁles are simple loops of...
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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