what is a burr mill
Burr (cutter) A selection of carbide burrs. Burrs (sometimes called rotary files) are small cutting tools used in die grinders, rotary tools, or dental drills. The name may be considered appropriate when their small-sized head (3 mm diameter shaft) is compared to a bur (fruit seed with hooks) or their teeth are compared to a metal burr. Burrs are a rotary analog to files that cut linearly (hence their alternate name, rotary files).