Fitting multidimensional measurement data to tolerance zones having regard for the uncertainty of the measurements

摘要

A method of determining whether measured data points (A-K; a-q) of a part represent an actual description of the part capable of fitting within a geometrical tolerance zone (26, 36) to a desired level of confidence for accepting or not accepting the part, comprises the steps of associating each of the measured data points (A-K; a-q) with a geometric uncertainty range (10A-10K; 30a-30q) fitting the measured data points (A-K; a-q) within a geometrical tolerance zone (26, 36) accepting the test part when the measured data points collectively fit within the geometric tolerance zone. The step of fitting includes collectively transposing the measured data points (A-K; a-q) with respect to the geometrical tolerance zone (26, 36) and calculating errors at which any of the measured data points (A-K; a-q) do not fit within the geometrical tolerance zone (26-36) by the amounts that correspond to the different geometric uncertainty ranges (10A-10K; 30a-30q) of the measured data points (A-K; a-q).