BT brings up a good point. I'm not a big fan of insurance, but in this case it might be a good idea. Even if you have coverage on yourself, if you get injured your insurance company might go after him and there would be nothing you could do about it. There are lots of ways to go about making the arrangements to achieve the same end result. It may be better to just rent the mill from him on an hourly basis, which should release him from any liability resulting from its use. It may be worthwhile to have a brief consultation with a local lawyer, as things work a little differently from one State to another.
