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Unformatted text preview: so as to respect the FR imposed on the designer. The results are then evaluated by comparing the predicted variation with the corresponding specified design requirements. Depending if the computed variation is greater or less than the specified assembly tolerance, the contributions can further be used to help decide which tolerance to tighten or loosen. 4. STEPS FOR THE RE-DESIGN OF ASSEMBLY The goal of tolerance redesign is to verify and adjust the tolerances assigned at the design stage so as to meet a given FR target at the assembly level (gap or clearance). More specifically, the tolerance redesign method consists of the flowing steps: 1. Establish a critical FR and specify the design limits; 2. Identify the component dimensions which contribute to the FR; 3. Specify tolerances for each dimension in the dimensional chain around the FR which has been specified in the first step. Then, impose initial values (extremes limits) for each tolerance in the chain; 4. In this step, apply the unified model (equation 2) firstly to obtain the variation of the FR (calculated FR) and secondly to obtain the contribution percentage (equation 4) of each FE to the FR; 5....
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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