I use
1/2" x 7" x 1-1/4" wheels that are customarily used on cutter grinders and
small surface grinders for tool sharpening.

After spending 100 dollars on 2 norton 10 inch grinding wheel that
are not so great, I wish I had bought surface grinding wheels.
Probably a bit more money and a little work to make the hubs, but
I'm sure they will work better.

chuck