A machine that applies a sharp blow to the work area through the fall of a ramThe 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 Gravity HammerA 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 Power-Driven HammerA forging hammer with a steam or air cylinder for raising the ram and augmenting its downward blow..