After watching Bill fix a tapered blade with his benchgrinder, I'd like to try grinding out some frowns with my Dremel. I know this is a major "do it at your own risk" approach, but I'm hoping to pick up some tips if anyone else does this.

What type of bit should I use? I'm thinking one of the orange grinding stones...

How should I angle the blade? Should I run the stone lengthwise on the edge or perpendicular to it?

Thanks,
Josh