Common Reasons for CNC Lathe Feed Axis Stalling

I. Power Supply Failure

Servo driver power not connected: A tripped circuit breaker, blown fuse, or damaged power module results in no power supply to the Z-axis servo unit.

Abnormal voltage: Low input voltage or three-phase imbalance causes the driver to malfunction.

II. Mechanical Failure

Guide rail jamming or lead screw nut assembly jamming: Poor lubrication, metal shavings accumulation, or long-term wear causing blockage of moving parts.

Brake not released: A servo motor brake circuit malfunction (e.g., solenoid valve not operating, circuit disconnection) locks the motor rotor.

Loose or broken coupling: Failure to connect the motor to the lead screw prevents power transmission.

III. Electrical Failure

Broken or poor contact motor power line: Prolonged vibration causes the terminals to loosen, affecting current transmission.

Encoder feedback line failure: Signal interruption can cause position loop malfunction, triggering automatic system shutdown protection.

Contaminant contamination or oxidation: Poor contact at the CNCPMCJF1 interface affects control signal transmission.

IV. Servo System Faults

Servo driver alarms or damage: Overcurrent (OC), overload (OL), encoder malfunction, and other alarm codes appear.

Servo motor damage: Burned windings, encoder zero-point drift, or demagnetization of poles result in no response.

V. Control System Faults

CNC system does not issue feed commands: Program error, paused state, or "enable" condition not met.

Parameter setting errors: Acceleration or gain parameters are missing or incorrectly modified, resulting in axis disabling.

PLC logic errors: Emergency stop circuit not reset, limit switch mistriggered, or enable signal not output.