We have two lathes at work a newer South Bend has a six foot bed. We have another older South Bend with a four foot bed. I would like to be able to crown and chamber my own barrel. I would prefer to use the newer South Bend, but I work for the federal government. Most people wouldn't mind me working on a firearm, bit there's some that might. The older lathe is off site and the manager of that facility wouldn't mind me leaving a barrel in the lathe. I'm a rookie at this and have not been doing very precise work, but would like to. How can I check the headstock on the lathe to see if its precise enough for gun work?