You might want to take a gander at your yellow pages to see how much competition is in your area. Also most hardware and garden equipment shops offer chain service. A good grinder will set you back 4-5 hundred dollars, the smaller less costly units have much lighter duty motors and do not hold up to a lot of continuous use. You will also need a breaker and and spinner tools to be able to assemble loops. Then you will need a source for reels of bulk chain,presets,and tie straps at a reasonable discount, other wise your cost will be more than the retail at the store. Another thing is that you cannot/ or should not mix brands of chain components as no 2 brands are exactly alike. I am not trying to pour any cold water here, just giving a heads up. I own and run a sharpening/ machine shop for the past 20 years so this info from the horses mouth and not the tail end. Chris, Mr. B's Blades, Milw. WI