a device on which filled sand-casting molds for one
application are shaken in order to break them up and separate the used molding
sand mixture from the hardened castings. The vibrating screens on which the
casting molds are placed are powered by pneumatic vibrators or mechanical drive
systems. Mechanical vibrating screens include the unbalanced-pulley and the
cam-driven types; these consume far less electricity than the pneumatic
screens. When vibration is applied, the molding sand mixture drops through the
screen and can then be used repeatedly, while the castings are taken off for
machining and fettling.
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