you need a big drum sander mate idearly or a sanding drum to go on a motor/polisheron a drum sander the pad behind the sand paper os foam so u can push it hard to the bat
Best thing is to check on ebay. quite a few on there. im guessing you probably looking for 240v or single phase ( 2 names for household supply)you want to keep the rpm relatively low. too high and you will remove too much wood too quickly or the work piece will burn/scorch. mines 1425 rpm.
There are a few motors on there but none with the chucks already fitted. That's the hard bit