Foundries make metal parts: they use sand and ceramic materials to make molds and cores to make those metal parts.  Sand molds and cores are made by a variety of processes, from green sand to no-bake and beyond.  Cores are made through a variety of processes, too, some with tooling and some by hand. Pretty much all the processes require some form of a solid pattern.   As time goes on, the tools that are used and the sophistication of the media continue to improve.  ...

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