Drills

Details Drills Drills

B - Operations, Transporting

23

B

77/34

B23B 51/00 (2006.01)

Patent

CA 1097104

A B S T R A C T The invention provides a twist drill particularly suitable for drilling holes in wooden railway sleepers. The drill comprises a fluted body terminating at its leading end in opposed cutting faces, a threaded portion trailing the cutting faces and adapted to serve a drill feeding function, and a second set of opposed cutting faces which trail the threaded portion and which have a larger radius of cut than the leading cutting faces. Preferably the second set of cutting faces are of sub- stantially the same diameter as that of the body. -1-

319989

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