REAMER

摘要

The blade platelet has at least one main cutting edge with adjacent secondary cutting edge(s). In the region of the two edges is located a free face which has a first free face section (19) with a down inclined free angle of approx. 7 deg. in the region of the secondary cutting edge. To the secondary cutting edge is associated an extra, second free face section (23), directly joining the secondary cutting edge. It merges into the first free face section at a free angle considerably smaller than the latter. Pref. the angle of the second free face section is 0.5 to 1.5 deg., typically 1 deg.