First, I know someone will chime in that they sharpen them by hand. But that's not a skill I have, and based upon experience never will. I own both a Drill Doctor (model 750, not 750X) and a General / Craftsman that uses side of the wheel to do sharpenijng. The DD produces great looking bits that don't work, as the relief angle is wrong. The heel is higher than cutting edge. The General / Craftsman does a great job on larger bits, it's just slow. I came across a couple of you tube videos of shop made sharpeners that look like they would work. One is simply a V groove cut at 59 degrees in a piece of plywood. Bit is placed in grove and slid back and forth across grinding wheel. Other (A Drill Sharpening Jig You Can Rely On) uses a disk sander and a super simple jig. It grinds both cutting edge and relief in one motion. As usual with me, I'm working on ideas to improve it. Once I get the kinks worked out, I will post results. In the mean time, look at the videos on you tube