I set up using an old washing machine motor as an immeadiate answer but found the speed too slow. The idea was to throw it away afterrwards if necesssary. This was after burning out an old black B and D drill. The bearings collapsed due to the side pressure but it lasted quite a while, but not long enough. If you buy a dedicated polisher I think the bearings will be suitably sized, etc to take side pressure which is considerably more than sharpening chisels and plane irons. I dont know prices but I would buy a polisher if you can. I still have to finidsh a job ...a motor bike restortion. The professional machines make it look easy with large motor and big wheels. Let me know if I can tell you anything else as I stood for weeks polishing the aluminium cases. Havent tried polishing wood. I also used the bits from the Polishibg shop. Best wishes.