Drill having cutting edges with the greatest curvature at the ce

Details Drill having cutting edges with the greatest curvature at the ce Drill having cutting edges with the greatest curvature at the ce

1980-02-22

1983-04-26

Bilinsky, Z. R.

Cutting by use of rotating axially moving tool

Processes

Bit detachable

407 54, 408230, B23B 5102

Patent

active

043811620

ABSTRACT:
A drill comprising a pair of cutting edges extending from the center of rotation of the drill symmetrically with respect to the center and curved outwardly away from the direction of rotation of the drill with a greater curvature in the center portion than in the outer peripheral portion of the drill when seen in a bottom view. The cutting edge is formed, close to its starting end, with a rake face having a rake angle approximately zero to enable the starting end portion of the edge to cut a workpiece with greater ease.

REFERENCES:
patent: 750537 (1904-01-01), Hanson
patent: 2769355 (1956-11-01), Crisp
patent: 2778252 (1957-01-01), Oxford, Jr.
patent: 2966081 (1960-12-01), Kallio
patent: 3680262 (1972-08-01), Aydelott et al.
patent: 4123186 (1978-10-01), Hoadley

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