Application of design of experiment techniques to estimate CMM measurement uncertainty

摘要

Coordinate Measuring Machines (CMM) calibration has been widely investigated by researchers and the methods of mathematical modeling. comparison and performance tests are applied to determination of measurement uncertainty. Mathematical modeling is the method most suitable to determine the uncertainty of CMM measuremens and its application involves the calibration of the CMM geometric errors. Its use request high price equipment such as laser interferometer and it is time consuming. The comparison method request a standard artifact identical to measuring part, but it is not suitable when there are different characteristics to be measured in a given piece (1), The performance tests are not time consuming and request different artifacts to be carried out (2). There are some intemational standards concerning application of performance tests and the yare largely accepted among CMM users. The utilization of statistical methods may complement the analysis of the results and it may provide sufficient estiamtes of measurement uncerainty (3).