Thermal expansion of ball screw in the semi-closed loop type CNC Lathe introduces positioning errors directly along the travelling axis. In this paper the thermal displacements of the ball screw were estimated by using macro variable. The estimated di...
Thermal expansion of ball screw in the semi-closed loop type CNC Lathe introduces positioning errors directly along the travelling axis. In this paper the thermal displacements of the ball screw were estimated by using macro variable. The estimated displacements of the ball screw were given to the NC in the form of pitch error compensation data into time interval. The thermal behaviours of ball screw of the CNC Lathe under the constant driving conditions were measured to examine the effectiveness of the displacements of the ball screw could be maintained less then 6μm positioning accaracy while using this compensation.