Some tools are very standardized. Basic modern lathes are all very similar to Maudsley's original precision lathe, which is in the Science Museum in London and worth a look. Someone who knew how to use Maudsley's original lathe would be able to use a modern non-CNC lathe with about five minutes of checking it out.
But faced with a basic modern 3-axis CNC mill, they'd be totally lost.
But faced with a basic modern 3-axis CNC mill, they'd be totally lost.