THE ESTIMATION METHOD OF UNCERTIANTY OF ARTICULATED COORDINATE MEASURING MACHINE

Ken Shimojima, Ryoshu Furutani, Kiyoshi Takamasu, Kenji Araki

Abstract

Articulated Coordinate Measuring Machines (A-CMM) are commercial products. However, it is difficult to keep the traceablity of it, because the calibration of A-CMM is performed by the manufacturer’s own method. We planed to use 3D artifact, which had 9 balls for calibration, and test it. The kinematical model of A-CMM was described in D-H notation. In A-CMM measurement, a cone-shaped stylus was used. We measured the artifact in five different locations and orientations. Because the artifact has nine balls, 45 points in total ware measured. the parameters were determined in each location and orientation. Each set of kinematical parameters is applied to the measured points in five different locations and orientations. Then the root mean squares are calculated in 25 kinds of combinations. As a result, the calibration result is better than the specified accuracy of Vectron.

Keywords

Articulated Coordinate Measuring Machine, Estimate uncertainty, Calibration

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PWC-2003-TC14-018.pdf

DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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