Cutting by use of rotating axially moving tool – Tool or tool with support – Having peripherally spaced cutting edges
Patent
1997-09-30
2000-04-04
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Tool or tool with support
Having peripherally spaced cutting edges
408 59, 408226, B23B 5100
Patent
active
060453052
ABSTRACT:
A helically fluted twist drill device is disclosed for cutting materials. The device comprises a shank having a first and a second end. A cylindrical core has a first diameter and a first and a second extremity, the core extending coaxially relative to the shank and from the second end of the shank, the second extremity defining a point. At least three portions extend helically outwardly away from the core so that the portions define a second diameter. The arrangement is such that adjacent portions define therebetween a surface of a helical flute. Each of the portions further define a helical bore connected to a source of a cutting fluid for permitting a flow of the cutting fluid through the bore from the shank towards the point. The arrangement is such that in use of the device, the cutting fluid conveys the materials from the vicinity of the point through each flute towards the shank. The first diameter has a dimension within a first range which is 20-35% of a dimension of the second diameter. Also, the surface is machined such that intersection of the portions with any normal extending outwardly from the surface is inhibited.
REFERENCES:
patent: 4134704 (1979-01-01), Jackley et al.
patent: 4826368 (1989-05-01), Tikal et al.
patent: 4898503 (1990-02-01), Barish
patent: 4932815 (1990-06-01), Krauss
patent: 5046902 (1991-09-01), Zubov et al.
Archer David J.
Howell Daniel W.
Smith Monica
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