Patent ID: 7192226

Claim:
A hand-held assembly for performing drilling or reaming operations on large objects utilized in the aeronautical industry, comprising: a hand-held drilling device having a rotatable drive element with a threaded bore; a drill bit having a shank portion and a helical cutting surface; a chuck having a bore that receives the shank portion of the drill bit and having an external threaded connector portion located thereon that engages the threaded bore of the hand-held drilling device; the chuck being heat shrunk onto the shank of the drill bit, thereby forming a unitary structure through direct bonding of the chuck with the drill bit; an abrasive material applied to the cutting surface of the drill bit; a chamber in the bore of the chuck; a coolant passage extending through the threaded connector portion of the hand-held drilling device to the chamber for communicating a coolant from the hand-held drilling device to the chamber; and a coolant channel on the shank portion of the drill bit and extending from the chamber to the cutting surface for communicating the coolant to the cutting surface.