Shenzhen Yudiao CNC Technology Co., Ltd.
Common Fault Solutions and Daily Maintenance Tips of Precision CNC Engraving and Milling Machine
Jul 14, 2025
Today, we will sort out the common fault solutions and daily maintenance tips of precision CNC engraving and milling machine for everyone, hoping to help everyone quickly solve the problem and reduce downtime losses.
Ⅰ. Quick diagnosis and maintenance of common faults；
1. Spindle abnormality (abnormal noise, overheating, unstable speed)
Reason:
- Spindle bearing wear or insufficient lubrication;
- The tool is installed eccentrically or not clamped firmly;
- Cooling system failure leads to poor heat dissipation.
Solution:
- Stop the machine to check the bearing status and add special high-speed grease;
- Reinstall the tool and calibrate the dynamic balance;
- Clean the spindle cooling water channel to ensure normal circulation of coolant.
2. Reduced machining accuracy (dimensional deviation, rough surface)
Troubleshooting steps: ① Mechanical part: Check whether the guide rail and lead screw are worn, remove debris and relubricate;
② Fixture problem: Confirm whether the workpiece clamping is loose, and replace the positioning pin if necessary;
③ Tool wear: Replace the passivated tool and check whether the tool compensation parameters are accurate.
3. System alarm (servo alarm, drive failure)
Coping methods:
① Check the alarm code and locate the faulty module by comparing with the manual;
② Check whether the power supply voltage is stable and eliminate poor line contact;
③ Restart the device and reinitialize the parameters (it is recommended to back up the parameters in advance).
Ⅱ. Five key points of daily maintenance
1. Cleaning and dust prevention
- After daily processing, clean the metal debris on the workbench, guide rails and tool magazine;
- Use an air gun to blow away the dust in the electrical cabinet to avoid short circuit of the circuit board.
2. Lubrication and maintenance
- Regularly add high-speed lithium-based grease to the guide rails and lead screws (recommended once every 200 hours);
- Check the amount of lubricating oil in the spindle oil cooler and replace the deteriorated oil in time.
3. Parameter backup and calibration
- Back up system parameters and processing programs once a month;
- Use a laser interferometer or ballbar to calibrate the machine tool accuracy (recommended once every six months).
4. Inspection of key components
- Belt/coupling: Check for aging and looseness;
- Limit switch: Ensure sensitive sensing to prevent collision.
5. Environmental management
- Maintain constant temperature (20±2℃) and humidity below 70% in the workshop;
- Avoid equipment operation in an environment with excessive vibration and dust.
Ⅲ. Professional maintenance suggestions
① Do not disassemble the machine blindly: When encountering complex electrical faults, contact the manufacturer's technical support first;
② Spare parts selection: When replacing core components such as bearings and lead screws, be sure to use original or high-precision substitutes;
③ Upgrade and transformation: For old equipment, consider upgrading the control system or adding an intelligent monitoring module to achieve fault warning.
IV. Case sharing: Quickly solve the Z-axis jitter of the precision engraving machine
A workshop reported that the Z-axis of the equipment jittered severely during processing. After investigation, it was found that:
1. The internal ball of the lead screw nut was worn, resulting in excessive clearance;
2. The servo motor gain parameter setting was unreasonable.
Solution: Replace the lead screw nut assembly and readjust the servo rigidity parameters, and the equipment will return to normal.
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