I am not and never have been a machining professional and I am sure you are much better than me at a lathe or a milling machine, but on the other hand, yes I have learned to define the right level of to be precise, this is the work of the engineers and the machinists only carry out what the engineers have determined.
No, I never served, I was lucky not to be one of the young people that our governments needlessly sacrificed, since USA, like France before you, lost the war against communism. But I respect veterans.