1 Prepare safe work
Unplug the tool from the outlet or remove the battery, remove the cutting bit, and clean away any accessible dust. Wear eye protection and review the manual for your specific model.
⚠ Warning: If vibration persists without a bit, the bearing or spindle may be damaged. Do not use the tool until it has been professionally inspected.
2 Check the bit and collet
Unplug the tool, clean the collet and chuck, and do not use a bent, dull, or cracked bit. The shank must be the correct diameter for your collet.
3 Insert and tighten the bit properly
Insert the shank deep enough, then pull it back a millimeter from the bottom of the collet and tighten with the proper wrenches.
4 Reduce speed for large bits
Larger diameter bits require lower speed and multiple shallow passes. Too aggressive a cut causes vibration and kickback.
? Tip: Take a photo of the initial condition and change only one thing at a time. That way you’ll know which check actually solved the problem.
5 Reassemble, test, and set a limit
Reassemble guards and attachments according to the manual and do a short test run without load, then on scrap wood. Strong vibration, sparking, smoke, or overheating mean you must stop immediately.