A Dremel will wreck your chainsaw chain

Using a Dremel to sharpen a chainsaw is a bad idea because the insane RPM overheats the teeth and ruins the steel’s temper.

Here’s the math: a Dremel spins at 30,000+ RPM. A proper chainsaw grinder runs around 3,000–4,000. That speed difference means the tiny grinding stone dumps heat into the cutter tooth way faster than it can dissipate. Once that edge turns blue or brown, the hardness is gone. The tooth will look sharp but dull in ten cuts, and you can’t re-temper it at home. The chain is cooked.

The other hidden problem is accuracy. Dremel stones are small and aggressive, so it’s nearly impossible to keep a consistent angle across all the cutters. You’ll take more steel off one tooth, less off the next, and the chain will cut crooked and vibrate. You also tend to skip the depth gauges entirely, which throws off the whole geometry. And the stones load up with metal, which can make them shatter at 30k RPM — right next to your face.

If you want to hand-file, fine. If you want a grinder, buy a real chainsaw grinder. The Dremel attachment looks clever in the box, but it’s a fast way to turn a decent chain into scrap.