sinker drill

sinker drill

[′siŋ·kər ‚dril]
(mining engineering)
A jackhammer type of rock drill used in shaft sinkings. Also known as sinker.
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References in periodicals archive ?
The mast-mounted Stanley SK-58 hydraulic sinker drill is equipped with a 2-in.
After the surface hole has been created, the sinker drill is retracted and swung out of the way so the auger can be fed directly into the bar hole.