churn drill

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churn drill [′chərn ‚dril]

(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.

churn drill

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

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No references found			In 1910 on Valdez Creek, miners used a churn drill for exploration. Going for the gold by Wendt, Ron / Alaska Business Monthly Vintage drill hole logs show drill holes penetrated this cover but encountered intensely hard altered sedimentary rock (hornfels) that was too hard to be penetrated by the churn drills of the era. Liberty Star Options Porphyry Copper Targets in Arizona and a ... by Business Wire Phase 1 is a Banka or Churn drill program to delineate the extent and nature of the gravels at an estimated cost of US$350,000. Cream Minerals Receives Technical Report on Casierra Alluvial Diamond ... by Business Wire			Churchill Churchill County Churchill Downs Churchill Falls Churchill River Churchill, Charles Churchill, John Churchill, Lord Randolph Churchill, Lord Randolph Henry Spencer Churchill, Randolph, Lord Churchill, Sarah Churchill, Sir Winston Churchill, Sir Winston Leonard Spencer Churchill, Winston Churchill, Winston Leonard Spencer churchite churchman Churchman, C. West churchwarden Churchyard, Thomas Churikovtsy Churinga Churkin, Nikolai Churkin, Nikolai Nikolaevich churn churn drill churn hole churn molding churn rate churn shot drill churning Churriguera Churriguera, José Benito Churrigueresque Churrigueresque style Chursin, Serafim Chursin, Serafim Evgenevich Churubusco Chusan Archipelago Chuseok Chushan-rishathaim Chusovaia Chusovaya Chusovoi Chusovoi Metallurgical Works Chust Chust Settlement Chute chute blades chute conveyor chute spillway			Churge-Strauss Vasculitis Churhc of england Churhc of england Churidar churidars Churikovtsy Churinga Churinga churingas churingas Churkin, Nikolai Churkin, Nikolai Nikolaevich churl churl churlish churlish churlishly churlishly churlishness churlishness churls Churly Churme churn churn churn churn churn churn churn away churn drill churn hole churn molding churn out churn out churn out churn out churn out Churn rate Churn rate Churn rate Churn rates Churn rates churn shot drill churn up churn up churna churned churned churned churned churned churned out churned out churned out churned out churned-up churner churner churner churner

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