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Definition of rock drill

i. A machine for boring relatively short holes in rock for blasting purposes. It may be a sinker, jackhammer, drifter, or stoper.

Synonym of: Waugh drill

See Also: percussive drill, rotary drill

Ref: Nelson

ii. A roller bit.

Ref: Long

iii. A conical bit for drilling hard rock.

Ref: AGI
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