Keeping the milling unit clean and inspecting it often is a good way to ensure that the milling bits are held properly during operation. This procedure will show you the easiest and safest way to remove the collet (often referred to as "chuck") for cleaning and inspection.
Collet change and clean
Open the collet with the release valve and remove the milling bit.
In this position, the rotor should not turn easily.
(Leave the switch in open mode) Closing the valve without a bit will damage the collet.
Using the collet removal tool and a dummy bit, reach under the spindle and unscrew the collet. If the collet is too tight use the wrench supplied to prevent the rotor from turning.
The rotor should not turn in collet open mode, this may damage the spindle.
Unscrew the collet completely and clean it with the brush from the tool kit.
Clean the spindle using the air button and the brush.
Never blow air up to the spindle.
Inspect the collet for signs of wear.
Fasten the collet back in place using the tool and a dummy bit.
The rotor must not turn since the valve is still in open position.
Do not overtighten the collet. Hand tight is enough. The use of the wrench is not necessary. It is shown on the picture as a preventive tool to avoid the rotor from turning.
Remove the dummy bit
The dummy bit will never be clamped by the collet in the operation. It is used only to avoid the collet to be deformed.
Clean the milling bit with alcohol and insert it in the collet. Then, put the valve back to normal operation mode (collet closed).
Do not push the bit up against the rotor’s shaft. Leave a small gap to avoid transferring the heat of the milling bit to the motor.
Never use any lubricant on the milling bits shaft. This will cause the bit to slip out of the collet during operation and damage the underlay or even the table.