Geometric error is one of the important factors affecting the spatial accuracy of CNC machine tools. Many error terms

complex mechanism and the coupling effect among the error terms

which ultimately affect the machining accuracy of machine tools. Therefore

it is very important to study and analyze geometric errors. In this paper

the research status of geometric error of CNC machine tools at home and abroad in recent years is summarized

including geometric error modeling

geometric error measurement

geometric error term analysis and geometric error compensation. The advantages and disadvantages of the existing modeling methods

measurement methods

geometric error analysis methods and compensation methods are summarized. From the perspective of equipment manufacturing industry

the research direction of geometric error of CNC machine tools in the future is forecasted.