Machining, Measurement, and Control Laboratory

A study on multi-axis contouring error on the transient state in NC machine tools
J. Fujita, S. Hayama, M. Hamamura, K. Shiba, A. Matsubara, and Y. Kakino

The influence of the torsional vibration of ballscrew on the stability of NC servo drive system has been studied in this paper. Theoretical analysis using mathematical model of the ballscrew drive system shows the possibility of the unstability of servo drive system due to the interacted effect of torsional vibration, the dead time and phase lag of the 1st order filter. Experimental analysis using the existing NC drive system shows fairly good coincidence with the calculated results.