Mechanisms of rock cutting

Mechanisms of rock cutting

Bits and coreheads cut rock by crushing, shearing, grinding or jetting. Crushing bits are the well known roller cone bits and hammer bits.

1 Crushing bits - roller cone rock bits

Crushing bits work by crushing the rock to make an indentation with a tooth and then scouring the rock away with the subsequent tooth movement. The harder the rock the smaller the indentations and the slower the drill rate per revolution. Rocks have a certain threshold pressure which is required to initiate the indentation of each tooth. Thus a tri-cone bit needs . . .

Restricted Content

Subscribe to view the Content