Tool and method for forming a lug hole
AssigneeHayes Lemmerz International, Inc.
InventorsGeoffrey L. Gatton, Dave Seiler
Life of this patent
Estimating the term…
Abstract
A single tool that provides multiple machining operations for forming a lug hole through a vehicle wheel hub includes an end portion having a first diameter and a mid-portion having a second diameter that is greater than the first diameter. A spade drill bit is mounted upon the end portion and a bore cutting tool is mounted upon the mid-portion.
Claims14
A tool for forming a lug hole through the disc of a vehicle wheel comprising:
- a stepped cylindrical base that includes an end portion having a first diameter and a mid-portion having a second diameter that is greater than said first diameter;
- a spade drill bit mounted upon said end portion, said spade drill bit having a width that is greater than said first diameter, said spade drill bit also including at least one chamfer cutting portion formed upon a reverse end thereof, said chamfer cutting portion extending in a radial direction beyond the surface of said end portion;
- and
- at least one counter bore cutting tool mounted upon said mid-portion of said base, said counter bore cutting tool operable to form a cylindrical counter bore in a workpiece.
A method for forming a lug hole through the disc of a vehicle wheel comprising the steps of:
- (a) providing a tool having an end portion carrying a spade drill bit, the spade drill bit including at least one chamfer cutting portion formed upon a reverse end thereof, and having a mid-portion carrying a counter bore cutting tool, the mid-portion having a larger diameter than the end portion;
- (b) drilling a pilot hole through a wheel disc hub with the spade drill bit, the bore cutting tool carried upon the mid-portion of the tool forming a counterbore in one end of the pilot hole;
- (c) rotating and moving the tool in a radial direction within the pilot hole;
- and
- (d) rotating and moving the tool in a circular arc to increase the diameter of the counterbore.
A method for forming a lug hole through the disc of a vehicle wheel comprising the steps of:
- (a) providing a tool having an end portion carrying a spade drill bit, the spade drill bit includes at least one chamfer cutting portion formed upon a reverse end thereof, and having a mid-portion carrying a counter bore cutting tool, the mid-portion having a larger diameter than the end portion;
- (b) drilling a pilot hole through a wheel disc hub with the spade drill bit, the bore cutting tool carried upon the mid-portion of the tool forming a counterbore in one end of the pilot hole;
- (c) rotating and moving the tool in a circular arc within the pilot hole;
- and
- (d) moving the tool in a radial direction to increase the diameter of the counterbore, while continuing to rotate and move the tool in a circular arc.
Dependencies are inferred from the claim text.