Churn drill

(mechanical engineering) Portable drilling equipment, with drilling performed by a heavy string of tools tipped with a blunt-edge chisel bit suspended from a flexible cable, to which a reciprocating motion is imparted by its suspension from an oscillating beam or sheave, causing the bit to be raised and dropped. Also known as American system drill; cable-system drill.

A drill whose cutting action is achieved by raising and dropping a chisel bit.

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. They were common in the Tri-State areas during the lead and zinc mining in Missouri, Oklahoma, and Kansas.

There is an example of one of these machines at the Northern Life Museum in Fort Smith, Northwest Territories, Canada. It was used in 1929-1930 at the Pine Point lead and zinc mine in the Northwest Territories.

External links

• http://www.maden.hacettepe.edu.tr/dmmrt/dmmrt217.html

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