Abstract: A mechanical bodymaker drive system for an under drive type vertical punch including a scotch yoke mechanism utilized to drive the punch. Two counterrotating cranks with counterweights are geared together to balance inertial forces on the scotch yoke driven slide. The scotch yoke mechanism, employing a slider block and slide, eliminates second harmonic inertia forces acting on the machine and allows counterrotating counterweights to totally balance inertia forces throughout the stroke. The punch is additionally hydrostatically attached to the scotch yoke mechanisms to compensate for deflections and thermal stress during operation. The hydrostatic pads eliminates the clearance between the face of the punch and the scotch yoke yet permits small lateral movements.

Abstract: A bodymaker tool pack including a plurality interleaved ironing and spacer rings through which a ram or punch forces a workpiece to redraw a metal can body. Hydrostatic pads are created between the punch and spacer rings to effectively guide the punch through the tool pack. Additionally, the ironing and spacer rings are themselves supported by hydrostatic pressure pads formed within the tool pack housing.