How it Works
A pneumatic drill is comprised of a series of air tubes connected to a pile driver that is attached to a drill bit at the bottom. Compressed air delivered by a diesel engine enters into the drill and the air tube circuit. The movement of air pushes the pile driver down upon the drill bit. This causes the drill bit to pound into the surface of the road, pavement, or sidewalk. The drill’s downward movement, combined with the vibration of the drill pounding the surface, causes a valve inside the air tubing to invert, and the air to flow in the opposite direction. New air flow results in the drill rebounding away from the earth. The valve flips and the air flow, combined with the force of gravity, pulls the drill bit back down towards the earth again. The drill bit is able to smash the surface at a average of 25 times per second or about 1,500 times a minute.