Workshop Technology
The purpose of a riser is to

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

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Workshop Technology
The purpose of a gate is to

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

ANSWER DOWNLOAD EXAMIANS APP