Runner

DEFINITION

In lost-wax casting, a channel in the mold through which the molten metal flows into the mold from a funnel or runner cup. Channels are made by attaching wax rods to a wax model prior to investment. When the mold is full, the runners fill with metal too. They must then be sawn off and filed. Occasionally they have been incorporated into the design of the final work, and not sawn off. A common example is the tang descending from the base or lowest portion of a sculpture, which is employed to secure the sculpture to its pedestal.Also see risers, rodding, and sprue.

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