see yes back to looking for help with a motor and pulley system. if someone could be of assistance..
I think the problem is... to take an electric motor and make it variable speed (properly) will be very costly. The controls you would need to invest in are very expensive (do an ebay search for "variable speed motor control 120v") but with your cost going up, your reliability goes up.
If money is no object, try this:
http://www.ebay.com/itm/5-HP-120V-V...231?pt=LH_DefaultDomain_2&hash=item5190238a3f
If you really want to keep the costs low, but are willing to go through a little "trial and error", think outside the box. Look around on craigslist or your local paper for things like vacuum cleaners, electric leaf blowers anything that might have an electric motor that uses 120v. The vacuum cleaners with a rolling brush in the front (use a thick rubber band for a belt to drive the brush from the electric motor). If you can make it work, you can always find another used vacuum to convert over if the first one breaks down the road.
Now, if you take a motor that is designed to run at a certain speed and need to slow it down, the best way (in terms of reliability from the motor) is to adjust the size of the pulleys/gears (whatever makes the motor actually spin the rollers on the mill). If you adjust the speed of the motor with a sub-par controller (like say a dimmer switch for your dining room light fixture) the system will more than likely fail in a relatively short period of time.
Like I said, sometimes in order to keep the cost low, ya have to do a bit more work and research to find parts. And design it with room for improvement. Try to think ahead.
Just some ideas, I love to recycle things from the junk pile into new useable stuff.