My casting furnace gave out, it only got up to 550 degrees. Now it serves great as an oven that preheats moulds. Using the worn out furnace as an oven makes it so that by the time my new furnace has heated up the alloy, the old furnace has pre-heated mould. The first boolit drops perfectly and the preheating phase is no longer necessary.
And to think that I almost threw the worm out furnace away.