326 120 0 300 0 0323 120 0 300 0 0319 120 0 300 0 0314

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Unformatted text preview: 0, 0 40, 0 0.3040 40, 0 120, 0 0.3238 0, 0 40, 0 0.3040 40, 0 120, 0 0.3238 0.3050 mean 0.0130 std. deviation p1 0, 70 0, 70 0, 70 0, 70 0, 70 0, 70 0, 70 0, 70 0, 70 Maximum distance p2 p3 Probability 0, 0 120, 0 0.314 0, 0 120, 0 0.299 0, 0 120, 0 0.299 0, 0 120, 0 0.299 0, 0 120, 0 0.299 0, 0 120, 0 0.268 0, 0 120, 0 0.311 0, 0 120, 0 0.268 0, 0 120, 0 0.311 0.2961 mean 0.0171 std. deviation In a previous work we demonstrated that, to minimize the position error of a drilled hole resulting from inaccuracies on locators positions, the 2-locators on the primary datum should be positioned symmetric with respect to the X-coordinate of the hole nominal position, while the locator on the secondary datum should be positioned along the Ycoordinate of the hole nominal position [Moroni et al., 2003]. Farther and farther from the nominal centre of the hole the 2-locators on the primary datum are, preserving the symmetry, more and more stable is the optimal solution, since smaller is the gradient of the probability surface to maximise. The optimal positions of the locators obtained for a plate with a single hole or with 2holes pattern carried us to consider the positioning of the 2-locators...
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