Drill bit having a hemispherical head with an evolutive cut

Cutting by use of rotating axially moving tool – Tool or tool with support – Having peripherally spaced cutting edges

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407 54, B23B 5100

Patent

active

057253382

ABSTRACT:
The cutting end or head of a helically grooved drill bit is of generally hemispherical shape and has four cutting lips, two of which are disposed in end-to-end relationship at the point S of the bit. The cutting angle of the edge of each lip is evolutive, varying from 0.degree. at the point S to a value, determined experimentally in accordance with the material to be machined, at a position P at the intersection of the cutting edge with the end of the outer diameter d of the bit.

REFERENCES:
patent: 3409965 (1968-11-01), Fisher
patent: 3977807 (1976-08-01), Siddall
patent: 4285618 (1981-08-01), Shanley, Jr.
patent: 4712948 (1987-12-01), Kidani
patent: 4932815 (1990-06-01), Krauss
patent: 5186584 (1993-02-01), Muller et al.
patent: 5193943 (1993-03-01), Kim
DE-U-18 63 075 Gebr. Brasseler, p. 3 line 8, p. 4 line 4, figures 1, 2.

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