FIELD: metal-cutting tools, applicable for improving the centering capacity. SUBSTANCE: the drill has a core with chip-deflecting flutes and a head with two or more cutting members, each of them has at least one cutting edge defining the chip- breaking and rear surfaces and having a rectilinear main part and a curvilinear part adjoining the transverse cutting edge. The point of tangency of the straight line passing through the drill axis and the curvilinear part is removed from the drill axis. EFFECT: improved centering capacity. 8 cl, 10 dwg
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Authors
Dates
1998-02-27—Published
1993-09-23—Filed