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



Related Terms

DIAMONDTOOL

1.Any tool using a diamond-set bit to drill a borehole. 2. A diamond shaped to the contour of a single-pointed cutting tool, used for precision machining.

CUTTING EDGE

  1. The point or edge of a diamond or other material set in a drill bit. Also known as cutting point. 2. The edge of a lathe tool in contact with the work during a machining operation.

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.

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.

COUNTERSINK

The tapered and relieved cutting portion in a twist drill, situated between the pilot drill and the body.

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.

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.

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.

COLLARED HOLE

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

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