With 70,000 lb pullback and 28,000 lb pulldown, the water well drilling rig MARK70 proves its strength among the Versa-Drill fleet. Its exceptional, easy-to-use technology makes its compressor air drilling.
[pdf] A rotary drilling rig works by rotating a drill string, which applies downward pressure to a drill bit that grinds the earth. Drilling fluid or air is pumped down the drill string to cool the bit, carry cuttings to the surface, and stabilize the borehole.
[pdf] A rotary table is a mechanical device on a drilling rig that provides clockwise (as viewed from above) rotational force to the to facilitate the process of drilling a . Rotary speed is the number of times the rotary table makes one full revolution in one minute (rpm).
[pdf] 
