abstract:The churn drill is a large drilling machine that bores large diameter holes in the ground. In mining, they were used to drill into the soft carbonate rocks of lead and zinc hosted regions to extract bulk samples of the ore.
One great-torque motorwithproperpower is made to matchwith therotarychurnunitinpneumaticdrill to form the electricpneumaticdrill as one kind of powerfulelectrically driven tool.