An expert can't turn a piece of metal to an accuracy of a gnat's hair if the lathe is only good to the nearest 1/8 inch.
It's true! (But the expert might "tune up" the lathe a little first!)
A neophyte can't do it on the best of lathes.
Is unconditionally true! If only we had a forum here for "horror stories from the tool room", I could write pages!