VMC (Vertical Machining Center) – Common Problems Mechanical Issues Ball screw/linear guide backlash or wear Spindle bearing damage/noise ATC (Automatic Tool Changer) clamp/unclamp failure Way lubrication system blockage Coupling/belt looseness (between axis motor and ball screw) Electrical/Servo Issues Servo motor or drive fault/alarm Encoder feedback error VFD/spindle drive fault Wiring loose connection or EMI noise Controller/PLC Issues PLC ladder logic error (alarm trigger) Parameter mismatch/corruption Battery low alarm (parameter/position data loss) Axis position lost (home/reference error) Accuracy Issues X/Y/Z axis noise or vibration (motor–ball screw alignment issue) Backlash compensation error Thermal drift Others Coolant system leakage/pump failure Air pressure/pneumatic issue (in ATC, clamping)