Ringförmiger Kronenbohrer

摘要

An annular hole cutter including a cylindrical body provided with a plurality of circumferentially spaced apart cutter teeth, including a first group of cutter teeth that have alternate radial inner cutting edges and a second group of cutter teeth that have alternate radial outer cutting edges that are staggered circumferentially rearwardly from the alternate radial inner cutting edges of the first group of cutter teeth. The cutting edges on the cutter teeth of both groups of cutter teeth each have a leading point, and the leading point of the cutting edges on one of said groups of cutter teeth extends downward longitudinally beyond the leading point of the cutting edges on the other of said groups of cutter teeth.