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Unformatted text preview: 2), each element in the previous equation then becomes: C iu , C iu C iv , C iv C iw , C iw = = J J J J J J C FE i C , C 1 2 3 4 5 6 FEi iα iα C iβ , C iβ C iδ , C iδ FEi [u , u ] [v , v ] [w, w ] [α , α ] β , β δ , δ F E i (3b) Where CFEi C i k , C ik i : The contribution of the FE i to the FR; : Represent the interval contribution in a direction k, with k= u , v, w, α , β , δ ; : Represent the reference of FE i in the dimensional chain with i=1,2,3,…N; Using the contribution of each FE, it is easy to obtain a chart histogram of contribution with percentage values. The percentage contribution chart tells the designer how each dimension contributes to the total variation (FR). The contribution includes the effect of both dimensional and geometric tolerances. The Worst Case model assumes all the component dimensions occur at their worst limits simultaneously. It is used by the designers to insure that all the tolerances will meet the specified assembly limit. However, as the number of parts in the assembly increase...
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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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