I have 3 1/2 hp 8 amps Delta bench grinders in my shoeing trailer, which Delta does not make anymore. Non are used with stones 1 has grinding discs on one side and 6" wire wheel on the other. The next one is set up with buffing wheels and the third has a scotch wheel and a multi tool belt sander attachment which is a 2" X 36". What I do no about bench grinders is the horse power means nothing you want to look at the amps, a friend of mine has a HF 1 hp grinder and just doing my normal routine I can stop his grinder very easy and mine there is no way I can even slow them down. You get what you pay for, IMO I would return that grinder and by a higher quality grinder. I would surf the web for one, here are a few places to look not knowing what your budget is makes it difficult to point you in a better direction. Enco - Guaranteed Lowest Prices on Machinery, Tools and Shop Supplies Baldor knife making machines and suplies from www.trugrit.com
I will post a few more later.