Burnishing drill

Details Burnishing drill Burnishing drill

1990-08-01

1991-12-10

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool having crystalline cutting edge

408224, 408227, B23B 5102

Patent

active

050712942

ABSTRACT:
A burnishing drill includes a cylindrical drill body connected at its forward end integrally with a shank. The forward end of the drill body includes a first pair of cutting edges inclined radially and rearwardly from the forwardmost central end of the drill body toward the shank at a first cutting angle. A second pair of cutting edges formed of diamond chips are disposed in a plane intersecting the plane in which the first pair of cutting edges are located. The second pair of cutting edges are inclined radially and rearwardly from a position inside a circle including the maximum external margins of the first pair of cutting edges toward the shank at a second cutting angle.

REFERENCES:
patent: Re16817 (1927-12-01), Smith
patent: 1000067 (1911-08-01), Bennett
patent: 1387994 (1921-08-01), Lewis
patent: 2389909 (1945-11-01), Hofbauer
patent: 2479136 (1949-08-01), Schade
patent: 4671710 (1987-06-01), Araki
patent: 4944640 (1990-07-01), Suzuki et al.

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