Mutt, since you asked...I use two Baldor 1/2 hp units...that way, I can have 4 wheels mounted. I label the grit to eliminate cross-contamination of the wheels. Using this, I can start with a more aggressive compound and move finer without having to stop and change wheels. These things can really launch a part if you get careless. Gloves and face protection are a must.

mike in tucson