Multi-tooth drill with improved chisel edge

Details Multi-tooth drill with improved chisel edge Multi-tooth drill with improved chisel edge

1992-08-31

1993-08-17

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having inversely angled cutting edge

408230, B23B 5102

Patent

active

052362914

ABSTRACT:
A three-flute, three-tooth drill has a central peak on the central axis between three V-shaped teeth that provides improved cutting chisel edges. The rake faces, which produce the V-shaped cutting teeth, are setback of radial planes of the drill, and have a slight positive rake angle. Gashes are ground into the clearance faces in such a way as to produce the peak with three chisel edges, each of which curves radially out and merges into a straight cutting edge with no reversal in slope. Therefore, the chisel edges cut cleanly, due both to their positive axial rake, and due to the fact that there are no undercuts along their length in which chips could build up.

REFERENCES:
patent: 2898786 (1959-08-01), Willingham
patent: 3055239 (1962-09-01), Andreasson
patent: 4594034 (1986-06-01), Maier
patent: 4645389 (1987-02-01), Maier
patent: 5173014 (1992-12-01), Agapiou et al.
American Machinist, Whatever Happened to the Chisel Edge?, Feb. 1988, Fred Mason.
An Investigation of the Cutting Mechanisms of the New Point Drill, DeVries, Crosheck Jan. 18, 1988.

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