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Casting Processes - Pattern Making or Patternmaking
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Pattern making is the process of making a ‘model’ of a part to be cast. The pattern is a replica of the part to be produced but with shrinkage and machining allowances added on along with any necessary runners and risers for pouring the casting. The patternmaker usually makes the pattern from wood but for higher volume cast parts they are sometimes made from metal.
Patterns are commonly used for sand casting or shell moulding, but patterns can also be used for vacuum forming tooling, fiberglass moulds, ceramic casting and prototyping. In the case of sand casting the pattern is used to pack the sand in around to form the mould cavity. For shell moulding, the metal pattern is used to form the thin shell moulds.
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