Basic Maintenance and Care of CNC Lathes

Next, let’s take a look at the basic maintenance and care of CNC lathes.

　　CNC lathes are advanced machining tools characterized by a high degree of automation, complex structures, and substantial costs. Integrating mechanical, electrical, and hydraulic systems, they are highly technology- and knowledge-intensive. To maximize their performance, minimize malfunctions, and ensure routine maintenance, CNC lathe service technicians must possess expertise not only in mechanics, machining processes, and hydraulics, but also in computer science, automatic control, drive systems, and measurement technologies. This comprehensive skill set enables them to thoroughly understand and master CNC lathes, thereby performing timely and effective maintenance.

The main tasks of daily maintenance and care for CNC machine tools are:

　　1. Select an appropriate environment: The operating environment of a CNC lathe—such as temperature, humidity, vibration, power supply voltage, frequency, and electromagnetic interference—can affect its normal operation. Therefore, when installing the machine tool, it is essential to strictly adhere to the installation conditions and requirements specified in the machine’s instruction manual. Where budgetary constraints permit, the CNC lathe should be installed separately from conventional machining equipment to facilitate maintenance and servicing.

　　2. CNC lathes shall be operated by dedicated personnel trained in CNC system programming, operation, and maintenance. Such personnel must be familiar with the machine tool’s mechanical components, the CNC system, high-pressure equipment, hydraulic and pneumatic systems, as well as the operating environment and machining conditions, and must be able to use the CNC lathe correctly in accordance with the requirements specified in the machine tool and system operating manuals.

　　3. Maintenance and care of CNC lathes that are not used for extended periods: When a CNC lathe is idle, the CNC system should remain powered on to allow the machine to run at idle. During the rainy season, when ambient humidity is high, the machine should be energized daily to use the heat generated by the electrical components to dissipate moisture inside the CNC cabinet, thereby ensuring the stable and reliable performance of the electronic parts.

　　4. Maintenance of the CNC system’s hardware control section: Experienced maintenance electricians should perform an annual inspection to verify that relevant reference voltages remain within specified limits, including the various output voltages of power supply modules and the reference voltages of the CNC unit. If any deviations are detected, clean away accumulated dust. Also check that electrical component connections throughout the system are secure, ensure that the fans in each functional module are operating properly and remove any dust buildup. Verify that the external regenerative discharge units associated with the servo amplifiers and spindle amplifiers are reliably connected, and clean them as needed. Finally, confirm that the backup batteries powering the memory in each functional module maintain proper voltage; replace them periodically according to the manufacturer’s recommendations. For machine tools that remain idle for extended periods, run the equipment for four hours once a month to help prolong its service life.

　　5. Maintenance of the machine tool’s mechanical components: Operators should remove chips scattered on the saddle, guideways, and other areas at the end of each shift. During operation, regularly check that the chip conveyor is functioning properly to prevent chip accumulation, which can compromise guideway accuracy and shorten the service life of the ball screws and guideways. Before concluding work, all servo axes must be returned to their home positions and brought to a stop.

　　6. Maintenance of Machine Tool Spindle Motors: The maintenance electrician should inspect both the servo motor and the spindle motor annually, checking their operating noise and temperature rise. If the noise is excessive, identify the cause—whether it stems from mechanical issues such as bearings or from improper parameter settings on the drive amplifier—and take appropriate corrective measures. For DC motors, inspect, adjust, repair, or replace the brushes and commutator to ensure they remain in good working condition; verify that the cooling fan at the motor end is functioning properly and clean away any accumulated dust; and check that the motor’s connection plugs are securely fastened.