How to handle an overloaded CNC lathe?

I. Immediately stop the machine and disconnect the power.

If signs of overload are detected (such as abnormal noise, severe vibration, or system alarms), you should:

1. Quickly press the "Emergency Stop" button to immediately interrupt the power output of the spindle and feed system;

2. Disconnect the main power supply to prevent the motor or driver from burning out due to continuous overcurrent;

3. Maintain the original condition of the machine. Do not disassemble or adjust any parts yourself so that a professional can diagnose the problem.

This operation can effectively prevent secondary failures such as mechanical jamming, tool breakage, or electrical system damage.

II. Record Fault Phenomena and Alarm Information Under the premise of ensuring safety, record the following key information, which will be helpful for subsequent maintenance:

1. Alarm codes displayed by the CNC system (e.g., "Alarm 401" on a FANUC system indicates a servo malfunction);

2. Machining process and cutting parameters (speed, feed rate, depth of cut) when the overload occurred;

3. Abnormal manifestations: whether accompanied by a "humming" sound, smoke, burning smell, or significant temperature rise;

Last maintenance date and lubrication status.

III. Preliminary Inspection of Key Components After confirming that the power is off and there is no risk of residual energy release, a surface visual inspection can be performed:

1. Spindle area: Check for jamming, abnormal bearing noise, or overheating of the housing;

2. Feed system: Check whether the guide rails and ball screws are lacking oil or obstructed by foreign objects;

3. Tools and fixtures: Confirm whether the tools are severely worn or broken, and whether the workpiece is loose;

4. Cooling and lubrication system: Check whether the oil passages are unobstructed, and whether the lubricating oil is deteriorated or insufficient. If obvious mechanical damage is found (such as a broken coupling or belt slippage), it must be handled by professional maintenance personnel.

IV. Notify Professional Maintenance Personnel for Diagnosis and Repair
1. Submit the recorded alarm information and inspection results to the equipment maintenance team;
2. Maintenance personnel will use professional tools (such as an oscilloscope and infrared thermometer) to test the servo load, current waveform, and system parameters;
3. Replace damaged parts, adjust servo gain, or optimize cutting parameters according to the diagnostic results.

V. Testing and Verification Before Resuming Operation
After maintenance, the following steps must be performed before resuming production:

1. System Reset: Release the emergency stop, restore power, and clear alarms;

2. No-Load Test Run: Jog each axis at low speed to observe whether the movement is smooth and whether there is any crawling or abnormal noise;

3. Trial Cut Verification: Perform a light-load test cut using scrap material to test dimensional accuracy and surface quality;

4. Gradual Loading: After confirming that there are no abnormalities, gradually restore to normal cutting parameters.