A machine that applies a sharp blow to the work area through the fall of a The main reciprocating member of a press, guided in the press frame, to which the punch or upper die is fastened. onto an anvil. The ram can be driven by gravity or power. See also A class of forging hammer wherein energy for forging is obtained by the mass and velocity of a freely falling ram and the attached upper die. Examples are board hammers and air-lift hammers. and A forging hammer with a steam or air cylinder for raising the ram and augmenting its downward blow..