Workshop Technology
The metal patterns as compared to wooden patterns require less

Shrinkage allowance
Draft allowance
Machining allowance
Distortion allowance

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Workshop Technology
The purpose of a riser is to

Deliver the molten metal from pouring basin to gate
Act as a reservoir for the molten metal
Deliver molten metal into the mould cavity
Feed the molten metal to the casting in order to compensate for the shrinkage

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