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piston drill

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piston drill [′pis·tən ¦dril]
(mechanical engineering)
A heavy percussion-type rock drill mounted either on a horizontal bar or on a short horizontal arm fastened to a vertical column; drills holes to 6 inches (15 centimeters) in diameter. Also known as reciprocating drill.


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Stably higher demand for piston drill pumps in comparison to the demand for plunger drill pumps was reasoned by a lower cost of this type of equipment, longer wearability of details and a possibility to replace it more quickly.
 
 
 
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