piston drill

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.
References in periodicals archive ?
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.