Machining, Measurement, and Control Laboratory

Analysis Method of Motion Accuracy Using NC System with Synchronized Measurement of Tool-Tip Position
Kotaro Nagaoka, Atsushi Matsubara, Tomoya Fujita, Tomonori Sato

This paper describes a method of measuring and analyzing the motion accuracy of NC machine tools. A practical method of measuring the motion accuracy is required for the achievement of high precision machining. The motion accuracy of NC machine tools becomes an issue, as motion error emerges while a continuous path control is applied. Error is caused by several factors. In order to determine the effects of each cause, it is necessary to measure the differences among reference positions, feedback positions, and tool tip positions. Thus, a system of measurement that achieves synchronized acquisition of each of the aforementioned positions has been developed. The system is composed of the NC system, which can manage the reference position and the feedback position, and an additional sensor data acquisition system, which receives the tool tip position. A method of analyzing the acquired data to determine the motion accuracy is also proposed. Experimental results show the effectiveness of the proposed method.
Key Words:   measurement, motion accuracy, NC machine tools, synchronize