Self centering spade drill

Details Self centering spade drill Self centering spade drill

1995-06-16

1998-03-10

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having stepped cutting edges

408227, B23B 5102

Patent

active

057253374

ABSTRACT:
An improved self centering spade drill having at least three cutting blades extending radially outward from the center of the drill, the front edge of the blade constituting the cutting portion of the drill, the rear edge of the blade constituting the port end of the drill which are adapted to be received and supported by a drill holder.

REFERENCES:
patent: 1230569 (1917-06-01), Dixon
patent: 2237901 (1941-04-01), Chun
patent: 2739496 (1956-03-01), Fleischer
patent: 3169417 (1965-02-01), Andreasson, Jr.
patent: 3320833 (1967-05-01), Andreasson
patent: 5302059 (1994-04-01), Fabiano
patent: 5401126 (1995-03-01), Norris et al.
Parts Order List for Washington Spade Drills & Holders (2 pages).
Advertisements for Sandvik's Delta Drill (4 pages)
Parts Order List for Coromant Delta Drills (2 pages).

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