He's a 'mechanical' genius. [=he is a person who is very smart about machines]
He's not 'mechanically' inclined. [=he is not knowledgeable about machinery]
The flight was delayed because of 'mechanical' problems/difficulties.
(..) To meet my maker. Uh-huh. Well, you're in luck. And what do you want to say to your maker? By most mechanical and dirty hand... I shall have such revenges on you both. The things I will do. (..)2016 TvShow: Westworld Title: The Original Season: 1 Episode 1