A Method to Generate CNC Programs Suitable for High Speed and High Accurate Machining of Curved Shape

Abstract

Generally, programs for machining curved shapes with CNC(Numerical Control) machine tools are generated of approximated linear segments based on a set chord error. However, we think that it is desirable to generate programs by changing it to a more suitable chord error for high speed and high accurate machining. In this research, we propose a method to calculate a suitable chord error from curvature radius, commanded federate and CNC′s block processing time, and to generate programs based on the chord error. By experiments, it was verified that the CNC machine tools move with higher speed and higher accuracy with programs generated by this method.