What are the distinguishing features between a casting and a pattern?

A pattern is a kind made of an inexpensive, simple to figure with material like plastic or wood (but generally metal if a lot of sturdiness is needed). it's accustomed produce a mould, generally out of sand grains that are firmly stuck along either with clay and water or with chemical binders. The pattern is removed before gushing liquified metal into the mould. once it solidifies it's mentioned as a casting.
Each mould produces one casting and is destroyed within the process; sand may be a common mould material as a result of it will be simply re-used over and over.

Each pattern will turn out lots of or maybe thousands of molds throughout its service life. Eventually the pattern can wear out or get broken enough to wherever the molds it creates begin yielding unhealthy castings.

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