8 Aluminum ingots are heated to 1,300°F (706.7°C) in a furnace, reducing them to a liquid. This liquid aluminum is poured by hand into the sand mold's pouring basin sprue hole and through runners into the gate (the actual opening of the mold's cavity). The sand mold has the truck's axles in place before the aluminum is poured in. The mold is allowed to cool, then broken by hand and the parts removed. These pieces include the kingpin knob, pivot cup, baseplate, and riser pad. Using machines, a worker heat-treats each part. The parts are then grinded, polished, and drilled.