Between the levels of 40-50 Machinist doesn't get a single skill

[RichardButte]

The leveling progression in this game is atrocious, but I think MCH definitely has the worst of it. Just take a look at getting gauss barrel at level 52 and see what that adds to the job...

This.

And to answer a rhetorical question, it gives you the ability to overheat but no means of actually controlling your heat whatsoever...