Improved integral boring and threading tool and method

Abstract From the Canadian patent

A unitary bore forming and threading tool for producing a variety threaded bores having chamfers and counterbores without a need for tool changes. The improved tool preferably includes a shaft of predetermined axial length and having proximal and distal ends, a shank located adjacent the proximal end a , holemaking element located adjacent the distal end and a threadmill portion , located axially between the bit and the shank. The holemaking element further includes a chamfering surface and an end cutting surface. The disclosed tool and method enable creation of a variety of bores such as chamfers counterbores, and threaded bores by producing bore portions of selectively determined …