The fitted V-shaped grooves in the The main reciprocating member of a press, guided in the press frame, to which the punch or upper die is fastened. and columns of a A machine that applies a sharp blow to the work area through the fall of a ram onto an anvil. The ram can be driven by gravity or power. See also Gravity Hammer and Power-Driven 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 descent and ascent of the ram.