Abstract: Dynamic controls and jaw mechanism for a forming machine adapted to impart compound curvatures to a metal sheet. The setting of the machine, particularly in its first and third stages, is dynamically controlled by a tracer and transducer system whereby, as for example, the vertical and horizontal positions of the first stage relative to the second are predetermined as is the relative horizontal position of the third stage. Enhanced responsiveness is achieved by the provision of roller bearings for the heavy mechanism comprising the several stages. A new jaw mechanism is provided for pulling the sheet through the machine, the jaws being self adjusting to afford a continuous gripping pressure on the sheet.