Ok, It appears that I'm now sharpening with that thing:
Drills seem to work well enough. I'm wondering if there's a finer grain of wheel I should be working with.
Next was the ends of an end mill, which worked but has some issues:
View attachment 29531
For one thing, the stone now looks *very* coarse for the work. The second is that this end mill has these little extra flutes at the outside, which in a single-pass grid wind up a bit lower than the adjacent part of the face nearer the center. This leaves tracks:
I'm not sure what the solution is. Use a much steeper aproach angle so the adjacent face is lower? Pre-grind some back clearance?
The bit works better than before I attacked it, so that's a positive - I can certainly use it for hogging material again. But I'd like to do a better job.