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A long, cone-shaped, noncoring bit used to drill past a deflection wedge in a borehole.



Related Terms

COLLARED HOLE

A started hole drilled sufficiently deep to confine the drill bit and prevent slippage of the bit from normal position.

DEFLECTION WEDGE

A wedge-shaped tool inserted into a borehole to direct the drill bit.

BREAST DRILL

A small, portable hand drill customarily used by handsetters to drill the holes in bit blanks in which diamonds are to be set; it includes a plate that is pressed against the worker's breast.

CIRCULATING FLUID

A fluid pumped into a borehole through the drill stem, the flow of which cools the bit and transports the cuttings out of the borehole.

CONCAVE BIT

A type of tungsten carbide drill bit having a concave cutting edge; used for percussive boring.

CRITICAL WEIGHT

In a drilling operation,the weight placed on a bit that will cause the drill string to become resonant with the angular speed at which the rotating shaft is operating.

BACK OFF

  1. To unscrew or disconnect. 2. To withdraw the drill bit from a borehole. 3. To withdraw a cutting tool or grinding wheel from contact with the workpiece.

BIT BREAKER

A heavy plate that fits in a rotary table for holding the drill bit while it is being inserted or broken out of the drill stem.

CHOPPING BIT

A steel bit with a chisel-shaped cutting edge, attached to a string of drill rods to break up, by impact, boulders, hardpan, and a lost core in a drill hole. Also known as chisel bit.

DETACHABLE BIT

An all-steel drill bit that can be removed from the drill steel, and can be resharpened. Also known as knock-off bit; rip bit.

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