The Thompson Retrievable Diamond-Drill Wedge and Arc Cutter

CIM Bulletin, 1953


VAUGHAN THOMPSON designed the Thompson retrievable diamond drill wedge and reaming assembly in 1948. Since 1950, the Hudson Bay Exploration and Development Company, Limited, has used the method extensively. The wedge, setting tool, and reamer have been modified slightly since they were first introduced. In 1951, Mr. Thompson designed the Thompson arc cutter. The purpose of this tool is to decrease effectively the diameter of the arc cut, using standard drilling tools.
Keywords: Bits, Clinometer, cutter, Hudson Bay, hydrofluoric acid, reaming, CORE, Cutter, Cutters, Drill, Drilling, Drills, Gravity, Tubes, Wedges