Things to pay attention to when repairing and maintaining CNC drilling and milling machines
Environmental control is the basis
CNC drilling and milling machines have high requirements on the environment and are best placed in a constant-temperature workshop. If the temperature fluctuates too much, it will cause thermal expansion and contraction of mechanical parts, thus affecting the machining accuracy. At the same time, stay away from vibrating equipment such as punch machines, because vibration will accelerate tool wear and even cause damage to the spindle.
Although electromagnetic interference also needs to be taken seriously, when there are high-power motors or high-frequency equipment nearby, it is very likely to cause interference to the CNC system signals. Baoxing Milling Machine Repair Center has dealt with many cases of program garbled faults caused by such interference. In the end, it was successfully solved by rewiring or adding shielding.
Personnel training cannot be spared
Personnel responsible for operation must undergo systematic training to understand the basic structure and operating procedures of the machine tool. In 2025, there was a hardware factory in Foshan. Due to misoperation by a novice, the tool magazine became jammed, and the cost of repairs exceeded 8,000 yuan. For maintenance personnel and programmers, they also need to learn new technologies regularly.
When programmers become familiar with the process, they can optimize the tool path, thereby reducing the load on the machine tool. Baoxing Maintenance Center recommends that the factory organize at least one training for all employees every year, focusing on daily inspection items and common alarm handling methods.
Operating specifications must be in place
No matter which CNC drilling and milling machine is used, detailed operating procedures must be developed, which cover the inspection after startup, the process of processing, and the steps when shutting down. In March 2026, there was a mold factory in Dongguan. Because it skipped the air pressure inspection, the pneumatic clamp became loose, and the workpiece flew out and broke the protective door.
Regular maintenance must also be carried out strictly, such as cleaning chips every shift and checking the lubricant level every week. Once a malfunction occurs, attention should be paid to protecting the site, taking photos to record alarm information , and performing turn-milling and maintenance operations , so that maintenance personnel can quickly locate the problem and prevent secondary damage.
Daily inspection to ensure accuracy
Before starting the machine every day, the lubrication status of the guide rails and screws needs to be checked. If the amount of lubricating oil is insufficient, wear will be accelerated. In 2025, there was an electronics factory in Shenzhen. Due to neglect of lubrication, three sets of screws were replaced within two months, and the cost exceeded 20,000 yuan. In addition, you must check whether the coolant is sufficient. If the temperature during cutting is too high, the tool will be burned.
When the spindle is running, you need to pay attention to the sound for turning and milling composite machining maintenance . Once there is abnormal noise, stop the operation immediately for inspection. The data displayed by Baoxing Maintenance Center shows that before the spindle bearing is damaged, there will generally be regular abnormal noises. If replaced in advance, the spindle can be prevented from being scrapped.
Regular maintenance to prevent failures
Carry out in-depth maintenance every three months, which includes cleaning the dust inside the electrical cabinet, tightening the secure wiring terminals, and checking the clearance between each axis in the opposite direction. In May 2026, an auto parts factory in Zhongshan reduced the probability of machine tool failure by 40% by implementing maintenance measures in an orderly manner.
The preload of the screw needs to be adjusted regularly, and the preload of the guide rail also needs to be adjusted regularly. Excessive clearance will affect the roundness of the machining, and excessive clearance will also affect the verticality. Baoxing Maintenance Center proposes to conduct laser interferometer testing every six months to ensure that the positioning accuracy is within the allowed range.
There are methods for troubleshooting
When encountering a fault, first check the alarm code and initially determine the cause according to the manual. Common problems include system crashes, servo alarms, tool magazine misalignment, etc. Issues that need to be paid attention to when repairing and maintaining CNC drilling and milling machines during turning and milling composite machining. Most cases can be solved by restarting or adjusting parameters. In 2025, a machinery factory in Guangzhou encountered a spindle overheating alarm. It turned out that the cooling fan was blocked by cotton wool.
It is recommended to contact a professional maintenance team for complex faults to avoid further expansion of the problem due to blind disassembly. Baoxing Milling Machine Repair Center can provide door-to-door service and issue a detailed report after the repair is completed to help the factory build fault prevention files.
CNC drilling and milling machines in your factory, when was the last time they were thoroughly maintained? You are welcome to share your maintenance experience in the comment area, like and bookmark this article, and continue to update it for more maintenance tips.
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