Patent ID: 9498829
Filing Date: 2016-11-22
CPC Classification: B23B,Y10T

Claim Text:
1. A drilling system for producing deep holes in a workpiece, comprising: a holder body having an outer diameter; a drill head having an outer diameter attachable to the holder body, with the holder body having a first mating surface, and the drill head having a second mating surface that engages the first mating surface of the holder body when attached thereto, the drill head having at least one cutting insert attached thereto; the first and second mating surfaces including one of the at least one dovetail protrusion formed to extend to the outer diameter of the mating surface and the at least one dovetail groove formed to extend to the outer diameter of the mating surface, with the at least one protrusion or groove formed on opposing first and second mating surface, and wherein the drill head is assembled to the holder body by rotating the drill head relative to the holder body about the axis of the tool until the at least one dovetail protrusion engages with the at least one dovetail groove to the outer diameter and locks the drill head into place in association with the holder body, the drill head having at least one aperture from the top of the drill head to the second mating surface, and at least one fastener extending through the at least one aperture and fastened to the holder body, wherein upon assembly of the drill head to the holder body, the at least one fastener carries substantially no load during drilling.