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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.