Ratchet

Ratchet was the best tool-and-die man on Cybertron. In his workbay on Earth he can make anything from a pin to a missile. Repairs injured Autobots, given the right parts. Likes to party, give backtalk, but does any job as well as anyone. Has laser scalpels, arc-welders, electron microscopes, circuit sensors, fluid dispensers at his disposal. Sometimes his having a good time interferes with his effectiveness.

(Source: Wikipedia)