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A Measuring Method of True Position under Pattern of Holes as A Datum

Shuang Zhang, Jingang Gao, Hua Wang


Because one possible displacement of the actual hole pattern with respect to the datum reference frame, the true position of pattern holes was hard to measure quantitatively, when a pattern of holes as a datum was applied. Taken cam cover as an example, firstly, mathematical algorithm for pattern of holes translation and rotation was introduced to calculate the displacement in coordinate measuring machine software; secondly, quantitative evaluation of true position under pattern holes as a datum was compared with the conventional datum method. Seen from calculation results, the curve for pattern holes as a datum is smoother than the conventional datum curve. This method could reduce true position deviation between holes to accept all of the parts that meet the function requirement.


pattern of holes, datum, true position, coordinate measuring machine.

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