TESTING AND EVALUATING ACCURACY OF NUMERICALLY CONTROLLED MACHINE TOOL

The accuracy of work on NC machine tools is far more affected by weight, clamping and thermal deformations and by variations of accuracy throughout the working zone than that of machine tools using other modes of operation. It is, therefore, important to precisely define the concept of accuracy, methods of testing and evaluating it. The paper presents a comprehensive system of tolerances of measuring methods and of evaluation including those adverse effects.