Dave:
Thanks. I understand you shouldn't use a diamond wheel on steel, and you need a diamond wheel for carbide. But I've read accounts that question this flat rule. Probably best to stick to the rules though.
I've also read good reports in using CBN wheels for steel. They seem to be expensive though.
I have a mix of carbide and HSS tools. With my machines and timidness I don't take advantage of the carbide. Though carbide tends to hold and edge longer, but chips easier. (this could just be my errant impression though) It will be a real advantage to make known sharp tools and keep them that way. Probably mostly for lathe tooling, boring bars, etc.
Thanks again for your help.