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       Stamping operations, such as drawing, blanking, piercing 
        and forming are perfomed on the presses that can be genarally divided 
        into three main types based on their drive: 
        Mechanical presses that have mechanical flywheel that 
        stores the energy and then transfers it to the puch and to the workpiece. 
        Hydraulic presses that use hydraulic cylinders to deliver 
        a controlled force. Hydraulic presses, and similarly hydraulic cushions, 
        can deliver the full power at any point in the stroke, variable tonnage 
        with overload protection; and adjustable stroke and speed. 
        Servo presses that are the presses driven by AC servo 
        motor. The torque produced is converted to a linear force via a ball screw. 
        They usually offer programmable stroke and slide velocity as well as dwell 
        in the stroke. 
         
         
         
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