The power press is used for cutting and forming sheet-metal parts. It has a strong base supporting a crank shaft, which converts the rotary motion imparted by the pulley or fly-wheel into the rectilinear motion of the gate or ram. A punch is fastened to the ram and carried by its motion through the die. The die is held stationary in a chair or bolster plate.

Fig. 200.   Grinding Machine.

Fig. 200. - Grinding Machine.