Oh well, one day I am sure!
Luckily things only have to be square or round and concentric. I dont think there was anything being machined that really needed to be within +/- .05mm.
Concentric was the main thing though. I think if I was asked to do almost any job to within +/- .001mm it would cost a fortune with many failed attempts, I don't think I even have anything to measure that precision
Jason