Variable rake mine tool insert and method of use

Details Variable rake mine tool insert and method of use Variable rake mine tool insert and method of use

1987-11-13

1988-11-29

Massie, IV, Jerome W.

Boring or penetrating the earth

Processes

175410, E21B 1058

Patent

active

047874643

ABSTRACT:
A mine tool roof bit insert having a leading face inclined at a constant angle of 0.degree.-3.degree. with respect to the axis of rotation, and a frontal face with a variable relief angle decreasing with increasing radial distance from the axis from 25.degree.-55.degree. at the axis to 15.degree.-25.degree. at its radially distal edge, the rate of decrease being at least 10.degree./in. A method of drilling a hole in a mine roof involves positioning a mine tool including the variable rake bit, insert, or the like, and rotating the bit, insert or the like at about 250-600 rpm and about 1000-8000 lb thrust for a time sufficient to drill the hole in the mine roof.

REFERENCES:
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patent: 4527638 (1985-07-01), Sanchez et al.
patent: 4696352 (1987-09-01), Buljan et al.
C. Fairhurst, "The Design of Rotary Drilling Bits", Mine & Quarry Engineering, p. 271 (Jun. 1954).

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