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Unformatted text preview: 80 0, 0 120, 0 0.328 mean 0.2978 std. deviation 0.0276 Table 2 presents the optimal position of the p 2 and p 3 locators along the X axis given by the analytic approach. A locator is always placed on the origin of the X axis, while the other moves away from the origin with the increase of the distance of the barycentre 208 W. Polini and G. Moroni of the 2-holes from the origin of the plate. If we use the barycentre method, we obtain a reduction of the average value of probability, with respect to the optimal solution, of 0.26% and an increase of 0.52% of standard deviation (see Table 2). If we use the maximum distance method, we obtain a reduction of the average value of probability of 2.06% and an increase of standard deviation of 1.68%. 3.3 Two holes pattern: case 3 We considered the plate shown in Figure 2 and kept unchanged the 2-holes pattern barycentre on the X axis (x = 210 mm), but we changed the holes distance. We obtained 16 different configurations, that are shown in Table 3 together with the optimal position of the p 2 and p 3 along the X axis. A locator is always p...
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