Patent ID: 6821061
Filing Date: 2004-11-23
Classification: B23B,Y10T

Abstract:
A drill for chip forming metalworking, comprising a shank defining a center axis of rotation, the shank having axially front and rear ends, the front end comprising three radially outer cutting edges spaced apart circumferentially with respect to the axis, three chip channels extending rearwardly from respective ones of the radially outer cutting edges, and three flush channels each terminating in an axially front end of a respective chip channel for conducting flushing fluid, each radially outer cutting edge including an axially forwardmost portion disposed at a radially innermost end thereof, the axially forwardmost portions of the radially outer cutting edges being arranged to:lie in a common imaginary plane oriented perpendicular to the axis, be spaced by equal radial distances from the axis, and lie in a common imaginary circle having a center coinciding with the axis and intersecting the three flush channels as the drill is viewed in an axial direction.