The influence of sampling strategy on a circular feature in coordinate measurements

Abstract This paper investigates the influence of the sampling strategy for circular section measurements when using coordinate measuring machines. The intention is to determine the relationship between the number of measured points and the computer results which give a true representation of the geometric circular feature. In order to identify the optimum number of points for measurement of a precision part, an analysis has been carried out using a calibrated ring gauge. The influence of the sampling strategy is predominantly considered. The influence of form errors (in the out-of-roundness of a measured component) and probe lobing errors are also examined briefly.