Mine tool roof bit insert and a method of drilling therewith

Details Mine tool roof bit insert and a method of drilling therewith Mine tool roof bit insert and a method of drilling therewith

1983-05-25

1985-07-09

Pate, III, William F.

Boring or penetrating the earth

Processes

175410, E21B 1700

Patent

active

045276382

ABSTRACT:
A mine tool roof bit insert geometry of a 30.degree. top relief angle between the top cutting edge and the top trailing edge and a radius of curvature of 1/16 inch at the corners improves the maximum wear and penetration rate when drilling into sandstone and a method therewith is described.

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