Here is an adapter for a drill to the knee crank on a Bridgeport. The material is 12L14, which is GREAT to machine BTW. The main body is 1.625" in diameter and 1.75" long, then there's the shank that fits in the drill chuck, which is .5" in diameter and 1" long with three flats .020" deep so it doesn't spin. The functional dimensions were just taken from the stock crank as far as depth and number of teeth (nine divisions makes the teeth, the cutter edge is set on the center line of the part), the diameter and depth of that counterbore (.950 diameter, .250" deep), and the size and depth of the hole (.625" diameter, 1.6" deep).
This is going to be one of the intermediate level machining projects for my class next semester. It's a useful part that gives lathe and milling experience, including using the dividing head and the co-ax indicator. I'm going to make sure to change a few things though. If you look at the teeth, they're angled a bit on the inside ends because I used a 3/16" endmill. It doesn't seem to affect it, but that's not like the original, so I think an 1/8" endmill is in order. I'll also have them turn down the body to reduce the weight. This thing is heavy!!!
Edit: I uploaded a video of it onto youtube