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Unformatted text preview: on the primary datum symmetrically with respect to the X-coordinate of the pattern barycentre and as far as possible, while placing the locator on the secondary datum coincident with the Ycoordinate of the pattern barycentre; we call this rule barycentre method. In this case the average value of probability the pattern of holes falls inside the tolerance zone reduces of about 0.42%, while the standard deviation increases of 0.31% with respect to the optimal solution (see Table 1). A further rule taken by common sense involves to position the 2-locators on the primary datum as far as possible and, therefore, on the vertices of the primary datum; we call this rule maximum distance method. In this case the average value of probability reduces of about 1.31%, while the standard deviation increases of 0.71% with respect to Position Deviation of a Holes Pattern 207 the optimal solution. Moreover, we observed that the distance between the centres of the 2 holes along the X axis is at most eq...
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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