Cutting by use of rotating axially moving tool – Tool or tool with support – Having stepped cutting edges
Patent
1997-02-13
1998-09-15
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Tool or tool with support
Having stepped cutting edges
408226, 408230, B23B 5102
Patent
active
058070397
ABSTRACT:
A wood drill with a point, cutting lips at the point, a shank and a body. The body having lands defining between them flutes. The flutes have a high helix reach extending from a distance from the cutting lips toward the shank, an intermediate helix reach extending from the high helix reach toward the shank and a low helix reach extending between the intermediate reach and the shank. The drill has screw threads in a peripheral surface of the lands from a point adjacent the cutting lips a distance toward the shank less than the length of the high helix reach of the flutes.
REFERENCES:
patent: 2662428 (1953-12-01), Mueller
patent: 2735116 (1956-02-01), Mueller
patent: 3665801 (1972-05-01), Gutshall
patent: 4561813 (1985-12-01), Schneider
patent: 5074728 (1991-12-01), Hau
patent: 5452971 (1995-09-01), Nevills
Booher Gerald D.
McKinney Philip O.
Wiker Juergen
Credo Tool Company
Howell Daniel W.
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