Is the CNC lathe currently undergoing an oil change and maintenance?

Dec 23, 2025

Whether a CNC lathe requires an oil change and maintenance should be determined by considering the equipment's user manual, maintenance schedule, actual operating conditions, and system prompts. The following is a detailed analysis:

Basis for judgment

 

Maintenance Schedule

CNC machine tool guide rails

Lubricating Oil: The lubricating oil for the spindle bearings, guide rails, and other parts of CNC machine tools needs to be replaced regularly, usually every 6 months to 1 year (refer to the equipment manual for specifics). If the replacement interval is approaching or has been exceeded, the oil may need to be changed.
Hydraulic Oil: The hydraulic oil in the hydraulic system of parts processing CNC machine tools (such as tool turrets and chucks) generally needs to be replaced every 1-2 years. If the oil emulsifies, changes color, or contains impurities, it needs to be replaced immediately.
Cutting Fluid: Needs to be replenished or replaced regularly (the frequency varies depending on usage). If the cutting fluid smells bad, deteriorates, or has an abnormal pH value, it needs to be treated.

Equipment Status Notifications

System Alarms: Some CNC lathes will trigger an alarm when the lubricating oil pressure is insufficient, the oil level is too low, or the oil temperature is abnormal (e.g., "Insufficient lubricating oil," "Oil temperature too high").
Manual Inspection: Check the oil color through the oil sight glass (clear is normal, cloudy or black indicates the need for replacement) and the oil level (replenish if below the lower limit).

 

Actual operating conditions

Machining Intensity: CNC machine tools under high load and continuous operation require shorter oil change intervals.
Environmental Factors: Dusty, humid, or high-temperature environments accelerate oil degradation, requiring earlier maintenance.

Oil change and maintenance steps

 

Shutdown and Power Off: Ensure the CNC machine is completely stopped and the power supply is disconnected.

Draining Old Oil:
Open the oil tank or oil circuit drain valve and drain the old oil into a clean container.
Use professional tools to clean residual impurities in the oil circuit (such as filters and oil pipes).

Cleaning the Oil Tank: Wipe the inside of the oil tank with a clean cloth or cleaning agent to remove oil stains and deposits.

Adding New Oil
Select a lubricant that matches the requirements of the CNC machine (such as ISO VG32, VG46, etc.).
Add the oil slowly through the oil filler port, avoiding air entering the oil circuit.
Fill the oil to above the midpoint of the oil level gauge, but not exceeding the upper limit.

Test Run and Inspection
Start the machine, run each axis at low speed, and observe whether the oil circuit is unobstructed and the oil pressure is normal.
Check for any oil leaks and tighten the connectors as needed.

CNC Machine Lubricating Oil

Precautions

 

Oil Compatibility: Mixing different brands or types of lubricants is strictly prohibited to avoid chemical reactions that may lead to performance degradation.
Safety Protection: Wear protective gloves and safety glasses when changing oil in CNC machine tools to prevent oil contact with skin or eyes.
Waste Disposal: Used oil must be recycled according to environmental regulations; indiscriminate dumping is prohibited.
Record Keeping: Record the oil change time, lubricant type, and quantity replaced for future maintenance reference.

Troubleshooting Common Problems

 

Alarm persists after oil change: If the alarm remains after changing the oil, check for blockages in the oil lines or sensor malfunctions.
Abnormal oil temperature: This may be due to insufficient oil or a faulty cooling system. Add more oil or clean the radiator.
Increased noise: This may be due to insufficient lubrication causing component wear. Check the oil lines and refill the oil.

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