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A mechanism designed to rotate and to cause an annular-shaped rockcutting bit to penetrate rock formations, produce cylindrical cores of the formations penetrated, and lift such cores to the surface, where they may be collected and examined.



Related Terms

A-MAST

An A-shaped arrangement of upright poles for supporting a mechanism designed to lift heavy loads.

AUGER PACKER

A feed mechanism that uses a continuous auger or screw inside a cylindrical sleeve to feed hard-to-flow granulated solids into shipping containers, such as bags or drums.

BIT BLANK

A steel bit in which diamonds or other cutting media may be inset by hand peening or attached by a mechanical process such as casting, sintering, or brazing.

HOLLOW-ROD DRILLING

A modification of wash boring in which a check valve is introduced at the bit so that the churning action may be also used to pump the cuttings up the drill rods.

DIAMOND DRILL

A drilling machine with a hollow, diamond-set bit for boring rock and yielding continuous and columnar rock samples.

ROTARY BLADE COMPRESSOR

Mechanism for pumping fluid by revolving blades inside cylindrical housing.

DIAMOND BIT

A rotary drilling bit crowned with bort-type diamonds, used for rock boring. Also known as bort bit.

BACK CHECK

In a hydraulic door closer, a mechanism that slows the speed with which a door may be opened.

CABLE DRILLING

Rock drilling in which the rock is penetrated by percussion, at the bottom of the hole, of a bit suspended from a wire line and given motion by a beam pivoted at the center.

BLOCK HOLE

A small hole drilled into a rock or boulder into which an anchor bolt or a small charge or explosive may be placed; used in quarries for breaking large blocks of stone or boulders.

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