Drilling bit, particularly auger, comprises circumferential external thread with centering tip lying in drilling axis, main cutting edge, and chip ejection groove helically arranged around core for discharge of drill cuttings

摘要

The drilling bit comprises a circumferential external thread (4) with a centering tip (3) lying in a drilling axis (a), a main cutting edge (5), and a chip ejection groove (6) helically arranged around a core for discharge of drill cuttings from the main cutting edge against the drilling direction. A recess (8) is provided, which is introduced in the centering tip that interrupts the external thread of the centering tip over a tooth width of the external thread.