Press Drive

Many different version of the punching system exist.  Hydraulic, hydramechanical, and air driven.  The two mechanical rams use a flywheel driven by an electric motor to develop tonnage.  In a hydramechanical system a small hydraulic pump delivers oil to a solenoid which when activated causes the clutch to engage generating a punch cycle.  

Newer machines primarily use hydraulic cylinders with smart controllers to punch.