Cutting by use of rotating axially moving tool – Tool or tool with support – Having peripherally spaced cutting edges
Patent
1983-09-26
1986-07-29
Briggs, William R.
Cutting by use of rotating axially moving tool
Tool or tool with support
Having peripherally spaced cutting edges
B23B 5102
Patent
active
046029001
ABSTRACT:
The specification discloses a micro drill with a modified point in which the drill is formed from a rigid cylinder and has two opposed helical wings and helical edges. Each wing has an undercut leading surface to provide a positive rake angle at the helical edges of the wings, and the two wings have a smooth "S" shaped cross-section. Two opposed flanks are formed by an inclined cut in each of the wings providing the drill point with a somewhat V-shape, and a leading corner is defined on each of the wings at the intersection of the helical edge and the flanks. A cut is provided in each of the leading surfaces adjacent to and below the flanks thereby forming a cutting edge on the drill point with an increased positive cutting action. The drill may be cut so that an under-surface is formed immediately below each flank and its cutting edge and so that a side surface is formed in the wings in an orientation perpendicular to the under-surface.
REFERENCES:
patent: 1069930 (1913-08-01), Down
patent: 2035298 (1936-03-01), Caldwell
patent: 2084737 (1937-06-01), Magnus
patent: 2328629 (1943-09-01), Eich et al.
patent: 2769355 (1956-11-01), Crisp
patent: 2897695 (1959-08-01), Winslow
patent: 2966081 (1960-12-01), Kallio
patent: 3058199 (1962-10-01), Cave et al.
patent: 3411386 (1968-11-01), Kubicek
patent: 3443459 (1969-05-01), Mackey et al.
patent: 3751176 (1973-08-01), Von Hollen
patent: 3778180 (1973-12-01), Ostrom
patent: 3933075 (1976-01-01), Peterson
patent: 3947143 (1976-03-01), Gulla
patent: 3991454 (1976-11-01), Wale
patent: 4135847 (1979-01-01), Hemmings
patent: 4209275 (1980-06-01), Kim
patent: 4330229 (1982-05-01), Croydon
Metal Cutting Tool Handbook, Jul. 1965 pp. 45-55.
Arpaio, Jr. Jerry
Heath Derek E.
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