Load up a heap of stone or iron, etc. Let it cook up the forge (30,000 is the max on the server I'm currently playing, dunno if that is vanilla or not).
Load a bunch more in there, start a heap of cement or something processing. Let it cook a little while. Start another batch or two of cement.
Fill the forge once more with stone/iron, whatever, max stacks. Cancel all the processing materials. It will overload the forge, numbers go negative and it throws up game freezing console errors until you shut the forge off.
Load a bunch more in there, start a heap of cement or something processing. Let it cook a little while. Start another batch or two of cement.
Fill the forge once more with stone/iron, whatever, max stacks. Cancel all the processing materials. It will overload the forge, numbers go negative and it throws up game freezing console errors until you shut the forge off.