Drill and combined drill countersink

Details Drill and combined drill countersink Drill and combined drill countersink

1977-03-14

1978-06-06

Hinson, Harrison L.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having stepped cutting edges

408199, 408226, B23B 5100, B23B 3144

Patent

active

040933954

ABSTRACT:
A drill for producing close tolerance holes in non-ferrous and non-metallic composite materials in which the essentially cylindrical size of the body of the drill is maintained all the way to the drilling point, the cylindrical shape as it approaches the drilling point is tapered by being flattened off on opposite sides to taper the body, and the drilling point has symmetrically formed and angularly related cutting edges in the opposite edges of the flattened and tapered body. The drill having the foregoing characteristics may be combined with a countersink formed either separately from or as an integral part of the drill.

REFERENCES:
patent: 158958 (1825-01-01), McCrosson
patent: 370484 (1887-09-01), Latham
patent: 512198 (1894-01-01), Lewis
patent: 2878809 (1959-03-01), Treace
patent: 2927614 (1960-03-01), Ransom
Publication by Rupert LeGrand entitled "The New American Machinists Handbook," copyrighted 1955, pp. 2-23.

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