Abstract
Programs for machining curved shapes with CNC (computerized numerical control) machine tools are commonly generated of approximated linear segments based on a set chord error, the so-called ‘tolerance’ on CAM (computer aided manufacturing) software operation. It is considered that smaller amount of chord error leads to higher machining accuracy. It is also empirically known that the chord error influences the machining time or the movement speed of the machine tool. However, there is no theoretical procedure to set the appropriate chord error for the CNC programs, to reduce the machining error but not decrease the feed speed as much as possible from the commanded one. In this research, we propose a method for calculating a suitable chord error from the curvature radius, commanded feed rate, and CNC block-processing time to generate programs considering the chord error. The results of experiments confirmed higher speed and accuracy of movements with CNC machine tools using programs generated by this method.
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