Our favorite model was the Drill Doctor 750X because it was easy to use on different drill bit types and sizes, worked fast, and sharpened many of our bits to better-than-new condition. But if you ...

I've been thinking about buying one of these but I don't know if they are just a gimmick. Also, if they genuinely work well how good do your bits need to be in the first place to be worth sharpening?

We may receive a commission on purchases made from links. You can tell a dull drill bit more or less immediately. If you're drilling wood, you'll likely see thin wisps of smoke as it starts to burn.