There are many uncertainties influencing the precision of coordinate measurement, most of which can be detected and compensated according to ISO 10360. However the effects of measuring instrument accuracy and information of measuring points including number and distribution are not duly researched. There's few reference for measurement personnel to reduce the effects. In this paper three experiments are provided to explore the effects of measuring instrument accuracy and measuring points' distribution on circular coordinate measurement precision. With the analysis of the data acquired by hundred thousand simulations with Matlab we find out the precision variation tendency of each impact factor. The analysis offers a standard of measuring instrument accuracy and measuring point's selection.

According to the comprehensive geometric accuracy of machine tool in the given machine, calculated along the axial direction, the accuracy of parameters, and then optimize the distribution become more cutting edge precision machine tool design. However, comprehensive geometric accuracy of machine tools to ensure eventually to implement on the movement of parts tolerance. Of the defects in the design method of this article in view of the present machine tool accuracy, put forward a kind of based on the geometry precision of five-axis machine tools integrated parts of tolerance design and verification method.