Three-Dimensional Gage (Long-Term Stability of the Gage and Calibration Test of Coordinate Measuring Machine)

Abstract

To improve the accuracy of CMM (coordinate measuring machine), the numerical error correction of systematic error components ascertained by the calibration procedure is employed. One way to calibrate CMM is to take advantage of the three-dimensional gage made for experimental purposes by the author. It is necessary that the gage is inspected correctly and measured with high accuracy with respect to repeatability and reproducibility. Furthermore, the shape of the gage or the relative positions of steel balls used as measuring points should remain unchanged for a long time. This paper describes the experiments on the accuracy of the gage, repeatability and reproducibility of measuring the gage, and the long-term stability of the measuring points, and gives the results of tests.