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A core is a sand or metal insert used to shape any part of a casting that cannot be shaped by the main removable pattern. when a pattern is pressed into sand and then extracted the impression it leaves must be concave. cores allow more complexity in the design. with well-constructed cores the foundry can create holes or chambers in the casting. automotive engine molds might have up to five cores in them to create the chambers necessary for the working of a combustion.
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