[cmaccoy]

If i were you I'd just get a small CNC mill. Like one of those cheap things some schools get for like 4 thousand dollars. The mill I'm thinking of isn't nearly as powerful as regular ones but it'll get the job done. And Bridgeport's can't do all CNC mills can. It would take a CNC mill 10 minutes or less to make a sprocket, with a Bridgeport, I'd say it may take 3 weeks if your good. Good luck to what ever decision you decide upon.