I have both a 6" and 8" bench grinder, but I suspect the 6" is too small and the 8" too fast for sharpening turning tools. I guess I fellow can't have too many grinders, so I'll see if I can get a slow speed one during the WoodCraft sale.
I'm pretty confident I'll get the hang of sharpening these tools pretty quickly. I've been sharpening a variety of other ways of turning perfectly good lumber into raw material for particle board for years. I know this isn't like handplanes or chisels, but at least I understand sharp edges and burrs.