An iterative procedure relating to the modification

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Unformatted text preview: represented on the right figure 4. Here, the fender is the datum. Clearances and cumulated deviations on parts (intervening in the chain of the headlight positioning) must allow maxima displacements of headlight control points inside their associated zones. Figure 4; Specified zone on headlight curve. Surfaces Seam Analysis 4. TOLERANCING ANALYSIS 249 The positioning of the headlight regarding the fender is carried out by a sub-assembly composed of four parts forming an open chain: the headlight, the technical front face (F.A.T.), the case and the fender (Figure 5). The functional requirement study between the fender and the headlight requires to consider the joint between these two parts and thus to close the chain by transforming the analysis graph into a single loop graph. The three full contacts of the assembly will be modelled by isostatic positioning broken up each one into three elementary joints: a planar joint (three point slider joints) blocking three degrees of freedom, an edge slider joint (two point slider joints) blocking two degrees and a point slider joint blocking the last degree of freedom of the link between the two parts. These contact points ar...
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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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