COMPARISON OF DAILY CHECK ARTEFACTS OF CMM

Ryoshu Furutani, Tsutomu Itabash, Miyu Ozaki

Abstract

The Coordinate Measuring Machines are recommended to be tested in an adequate time. In the case that the CMM is tested and the unexpected large errors or failure are found, it is difficult how to deal the data just before. So it is necessary to find the large errors or failure as soon as possible. Therefore it is better to test the CMM everyday or every measurement cycle. But this idea is very time consuming. <BR />As the most errors happen in the squareness and scale errors, the squareness errors and scale errors are tested every week using two artefacts, e.g. the QuickCheck and Ball Pyramid. The QuickCheck is developed and sold by Trapet Engineering. The Ball Pyramid is developed by NMIJ. Both artefacts have balls in three dimensional space and the coordinates of center of balls are referred. <BR />As the squareness errors and scale errors are dependent on the location, these artefacts are set on some locations in some orientations. <BR />These result is analyzed by ANOVA method. We show the scale errors are independent on the location and orientation of the artefacts. we show the squareness error between X-axis and Y-axis is large and dependent on the location of the artefacts. <BR />We also compare the results from both artefacts.

Keywords

calibration, cmm, artefact

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IMEKO-TC14-2013-07.pdf

DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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