Patent ID: 7513319

Claim:
A method for drilling a work surface comprising the steps of: providing an essentially cylindrical drill steel having a drill bit and a reamer bit with a plurality of essentially arcuate cutting elements in an overlying relationship with the work surface, rotating the drill steel to engage the drill bit with the work surface to form an essentially cylindrical hole therein, driving the drill steel into the hole to insert the reamer bit therein, extending a first arcuate cutting element from a first insert positioned on a cutting surface of the reamer bit, extending a second arcuate cutting element from a second insert asymmetrically positioned on the reamer bit cutting surface relative to the first insert so that the first cutting element is essentially offset from the second cutting element, contacting the first arcuate cutting element with the hole cylindrical surface, contacting the second arcuate cutting element with the hole cylindrical surface, rotating the drill steel to carve a first essentially spiral channel in the hole interior surface with the first arcuate cutting element to increase the hole diameter, and rotating the drill steel to carve a second essentially spiral channel adjacent to the first essentially spiral channel in the hole interior surface with the second arcuate cutting element to increase the hole diameter.