The parts of a A term generally applied to forging hammers wherein energy for forging is provided by gravity, steam, or compressed air. See also Air-Lift Hammer, Board Hammer, Steam Hammer. or A machine tool with a stationary bed and a slide or ram that has reciprocating motion at right angles to the bed surface; the ram is guided in the frame of the machine. that The parts of a drop hammer or press that guide the up-and-down motion of the ram in a true vertical direction. the up-and-down motion of the The main reciprocating member of a press, guided in the press frame, to which the punch or upper die is fastened. in a true vertical direction.