You rush forward and punch the robot with all your might! The armor doesn't even dent, but the robot seems a bit confused by your sudden aggression. It backs away, beeping nervously, before turning tail and scurrying off into the distance, leaving you alone in the wastes.
You cough up some dust and mutter under your breath. That robot's metal hide was tougher than you expected! Well, maybe it'll be easier to find something else of value...