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Unformatted text preview: revolute pair is modeled as a cylinder that rotates in a cylindrical shaft. A higher pair imposes multiple couplings due to contacts between pairs of part features. For example, gear teeth consist of involute patches whose contacts change as the gears rotate. The system transforms driving motions into outputs via sequences of part contacts. Small system variations can produce large motion variations, can alter contact sequences, and can introduce failure modes, such as jamming, due to changes in kinematic function. We ensure correct kinematic function by synthesizing tolerances that preclude failure modes and that limit motion variation. Nominal parameter values are changed when possible and tolerance intervals are shrunken as a last resort. We cannot search the entire 289
J.K. Davidson (ed.), Models for Computer Aided Tolerancing in Design and Manufacturing, 2 89– 299. © 2007 Springer. 290 M.-H. Kyung and E. Sacks parameter space for bad parameter values. Its dimension is prohibitively high because mechanical systems have tens to hundreds of shape and conﬁguration 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.
- Spring '10
- The Land