Machine Head

 is a challenge perk in Fallout: New Vegas, given for completing the Demise of the Machines challenge. "You grind the gears of the machines and gain a damage bonus against robots."

Effects
Bonus damage to robots (Mister Gutsy, Robobrain, Protectron, etc...). This perk stacks with other bonus damage perks such as Lord Death and Robotics Expert.

Requirements
Player must kill 50 robots per level of this perk.

Bugs

 * Although there are 3 ranks for this perk, a bug in the reward script makes it impossible to get the third rank. The same bug also causes the notification to misreport the rank that is given. When rank 1 is given, the notification says that you've been given rank 2, and when rank 2 is given, the notification says that you've been given rank 3.