Method of cutting and a cutting rotative bit

Details Method of cutting and a cutting rotative bit Method of cutting and a cutting rotative bit

1996-02-26

1998-09-01

Tsay, Frank

Boring or penetrating the earth

Processes

175350, 175374, 299106, E21B 1016, E21C 3518

Patent

active

057997411

ABSTRACT:
A cutting, self-rotating, and self-sharpening tool has a rotatable cutting element, generally circular, which is mounted and displaced so that cutting element has an attack angle between 90.degree. and 120.degree., and a skew angle between 5.degree. and 40.degree.. The cutting element has a convex front face and relief and rake angles that vary along the perimeter of the cutting edge.

REFERENCES:
patent: 4333540 (1982-06-01), Daniels et al.
patent: 4445580 (1984-05-01), Sahley
patent: 4538690 (1985-09-01), Short, Jr.
patent: 4553615 (1985-11-01), Grainger
patent: 4640375 (1987-02-01), Barr et al.
patent: 4751972 (1988-06-01), Jones et al.
patent: 5341890 (1994-08-01), Cawthorne et al.
patent: 5520444 (1996-05-01), Kosobrodov et al.

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