CNC machines that process wood face a challenge that metalworking machines don't: fine dust. MDF and particleboard dust gets everywhere, into guides, racks, sensors and even the electrical cabinet. On a machine without regular maintenance, loss of accuracy, unexpected stops and expensive spindle failures are inevitable.
The list below is a general framework; the intervals in your machine's manual always take priority.
Daily checks
- Dust and chip cleaning: At the end of each shift, clean the table, gantry, guides and racks, preferably with a vacuum rather than compressed air. Compressed air can push dust into bearings and seals.
- Dust extraction: Check that the extraction hood and hoses are not blocked. Weak extraction affects both cut quality and machine cleanliness.
- Spindle warm-up: Before high-speed work, warm the spindle up for a few minutes by stepping gradually from low to high speed. It's the cheapest and most neglected protection.
- Collet and nut cleaning: When changing tools, clean resin and dust from the collet and the taper.
- Noise and vibration: Note any unusual noise, hum or vibration.
Weekly checks
- Linear guide and carriage lubrication: If there is automatic lubrication, check the reservoir and that oil reaches the carriages; otherwise lubricate manually as the manufacturer recommends.
- Rack and pinions: Clean the dust and oil mix from the teeth and apply a thin film of oil. Thick grease mixed with dust turns into an abrasive paste.
- Vacuum pump: Clean the air filter and check the oil level depending on the pump type.
- Water-cooled spindles: Check the coolant level, its colour and that the pump is running.
Monthly checks
- Inspect the collets: Collets are consumables. A worn collet causes runout, poor surface finish and broken tools.
- Belts, couplings and connections: Check motor connections for looseness and belts for loss of tension.
- Electrical cabinet: Clean the fan filters; dust inside the cabinet is a common cause of drive failures.
- Spoilboard: If the surface is damaged, resurface it; it directly affects vacuum hold.
Yearly / periodic checks
- Backlash check on linear guides, carriages and ball screws
- Spindle runout measurement
- Axis squareness (gantry squareness) and accuracy check
- Testing of limit and reference sensors
Tip: Keep a simple maintenance log. When you record what was done on which day and which part was replaced, predicting failures becomes much easier.
When should you call for service?
If you notice grinding from the spindle, waviness on the surface, dimensional errors or lost steps on the axes, get technical service before the problem grows. Early intervention often prevents costly repairs such as a spindle overhaul or drive replacement.