the upper level of a pouring conveyor receives sand molds and conveys the empty molds to a pouring station wherein molten material is deposited therein to form castings . each mold is provided with a supportive weight and jacket before pouring . after the castings have been poured , the molds are transferred to the lower level of the pouring conveyor for cooling purposes , and then back to the upper level to remove the weight and jacket . the sand molds are then transferred to the upper level of a cooling conveyor and are deposited into trays provided on the cooling conveyor . each tray is adapted to receive a plurality of molds to enable the molds to move from serial to parallel movement . an indexable pusher arm is provided to accurately place each mold in a respective tray to insure proper spacing for uniform cooling . after each tray has traversed the upper and lower levels of the cooling conveyor , the molds are removed from the trays and the sand is broken away to reveal the castings for harvest . the volumetric capacity and cooling time can be adjusted simply by adjusting the number of trays disposed on the cooling conveyor .