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Been a while since I had it out of its box but I think your correct Mark, it runs CCW. I can't see the direction of part rotation making a lot of difference.
Greg
keep watching.........(I mentioned the height adjuster coming in my last post). There will be a height adjuster and a base plate marked in degrees to set the angles.Nice work, Mark! Now all it needs is a vertical adjustment screw to help set center height when grinding tapers.
I got my info from the Dumore instruction manual. I am trying to find another one to see if it says the same thing.I'm not positive, but I think it has to do with the grains of abrasive entering and exiting the work instead of surface speed. When parts turn against each other there's a shearing action, and if they rotate together (like gears) the abrasive gets mushed against the work and rubs instead of cuts. If my theory is correct, which I don't know if it is, it would only be true to a minuscule effect because of the vastly different surface speeds between the parts. Again I'm not really sure, just a guess.