Twist drills

Details Twist drills Twist drills

1976-10-07

1977-12-27

Hinson, Harrison L.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

B23B 5100

Patent

active

040652246

ABSTRACT:
A twist drill the cross-sectional shape of which is such that, although it can be sharpened on a conventional machine so that its cutting edges are contained in the surface of an imaginary cone, its cutting edges are curved and their lip rake is substantially constant radially outwards of the drill core.

REFERENCES:
patent: 262588 (1882-08-01), Hartshorn
patent: 1309706 (1919-07-01), Taylor
patent: 2328629 (1943-09-01), Eich et al.
patent: 2778252 (1957-01-01), Oxford, Jr.
patent: 2966081 (1960-12-01), Kallio
patent: 3443459 (1969-05-01), Mackey et al.

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