Workshop Technology
Tandem drawing of wires and tubes is necessary because

Annealing is needed between stages
Surface finish improves after every drawing stage
It is not possible to reduce at one stage
Accuracy in dimensions is not possible otherwise

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Workshop Technology
The purpose of a gate is to

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

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