When it comes to boring deep holes in wood, it is hard to beat a Forstner Bit. Spade Bits You probably have some spade bits to go with your drill.  These are fine for limited use.  They dull easily and are not easy to sharpen. The spade bit seams to overheat quickly. They jam up suddenly at that can be a knuckle buster. Holes sometimes get out of round when the bit travels too quickly while drilling. Hole Saws You may also be familiar with hole saws.  These are good for sheet goods like plywood and sheet rock, but are limited if you need to put a number of deep…