Considering its working stability, semi-closed loop control is usually used in middle -grade CNC machine tool But in the control processing quality and machining precision are seriously affected by wear, hot variant, screw error and backlash of machine driven system. In order to improve them, reformation processing on closed-loop of Y axis in THWMZT-1B CNC milling machine is introduced, such as connecting and installing hardware, setting parameters and backlash compensating. After commissioning it is satisfying that repeated positioning accuracy can reach 0.001mm.

Based on the FANUC 0iMateMD machine center, this paper introduces the structure of the bamboo hat ATC, the working principle, the process and the flow of automatic tool-change. By designing electrical diagram and PMC program and using correct adjustment methods, it realized the automatic tool-change control.