Guess I am a contrary old cuss.
My machines are old and replacement parts are not available.
Made enough mistakes on my own learning to use them, even with some experience.
Will make most any part for neighbors or friends, but don't allow them to use my machines.
Experienced machinist might be different, might learn something. Don't have the patience to teach.
Anyone who will let you use their machines is a Saint and should be treated as such.
Chuck