1 initial guess ta tb tc td te tf tg fr1 ta tb tc td

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Unformatted text preview: ssimilated to an iterative synthesis method targeted at helping the designer select the right values for the tolerances of each element in a mechanical assembly. 100 W. Ghie, L. Laperrière and A. Desrochers 5. NUMERICAL EXAMPLE The centering pin mechanism in figure 1 will be used to demonstrate the use of the tool. In this figure, we have labelled some key tolerances from ta to tg. The mechanism features three parts with two functional conditions shown in figure 2. Table I presents some initial, manually generated values for the variables ta to tg. These initial values are all expressed as intervals in equation 5. In this example, the designer is being imposed a first FR1, related to the vertical centering of the pin, with a precision of ±1mm. 100 100 50 4×Ø6 10 80 10 4 × ∅6 K 10 // tb 30 K 20 10+ta 10 40 10 20 // td L ∅20+te 30 30 50 ∅30 70 55+tc tg M M ∅20+tf 90 10 L 10 Figure 1: A three parts centering pin mechanism Prior to applying the principles set forth in the unified model proposed in [Desrochers et al. 03] one needs a chain of dimensions. Thi...
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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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