How to solve the inaccuracy of zero return of CNC machine tool turntable

Trouble phenomenon: A CNC machine with model XH754 supporting FANUC OMC, the turntable is not allowed to return to zero, and the worktable is skewed after returning to zero.

Analysis and treatment process: This kind of failure is generally caused by poor return switch of the turntable, loose stroke pressure block or loose switch.

After turning off, open the side cover of the turntable, press the stroke switch by hand, check the stroke pressure block is normal, check the switch seat is normal, and estimate the change of the pressure switch break point. Turn the switch base in the correct direction for a short distance and turn it on, and the fault is eliminated.