Drill bit point

Details Drill bit point Drill bit point

1992-07-31

1993-12-28

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

51288, 761086, 408227, B23B 5102

Patent

active

052733807

ABSTRACT:
A drill bit is provided having a novel drill point for drilling a variety of materials. The drill point comprises at least two opposed cutting edges, the cutting edges forming a predetermined drill point angle. The cutting edges have a first radial component between the extreme tip of the drill point and their respective lands. The first radial component is substantially concave. The cutting edges have a second radial component defined generally where the cutting edge merges with its respective land, the second radial component being substantially convex. The drill point of the invention can be applied to any variety of drill bit or cutting tool having any number of flutes, or may comprise a replaceable drill point. A method is also provided for forming the novel drill point according to the invention.

REFERENCES:
patent: 1747117 (1930-02-01), Klein
patent: 2371676 (1945-03-01), Coyne
patent: 4116580 (1978-09-01), Hall et al.
patent: 4222690 (1980-09-01), Hosoi
patent: 4483104 (1984-11-01), Welliver
patent: 4583888 (1986-04-01), Mori et al.
patent: 4645389 (1987-02-01), Maier
Advertisement--Mohawk Cutting Tools, pp. 77, 123, and 133.
Advertisement--Showa Tool USA, Inc., Price List and Types of Drills.
Advertisement--Showa Tool USA, Inc., Neomet Insert Regrinding Instructions.
Advertisement--Showa Tool USA, Inc., Neomet Insert Drills.

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