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Unformatted text preview: itions of p 2 and p 3 locators on the primary datum. 3. APPLICATION EXAMPLES The proposed approach was applied to a plate characterised by different patterns of two or four holes. It was assumed that the coordinates of the locators along the X and Y axes of the MRF are distributed according to a Gaussian probability density function, with mean values equal to the nominal positions and standard deviations equal to 0.01 mm. The tolerance zone of the holes pattern was squared with 0.02 mm side. The position of the locators that minimises eq. (8), under the constraints (9)-(10) was identified for the different cases. Starting from the optimal solutions we have defined and applied two simple locators positioning rules that we call “barycentre method” and “ maximum distance method”. 206 W. Polini and G. Moroni 3.1 Two holes pattern: case 1 A first plate (120 mm x 100 mm) was taken into account with 2-holes pattern, as shown in Figure 1. Nine 2-holes patterns were considered, for each of them the optimal position of the locators was determined, as shown in Table 1. The op...
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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