Workshop Technology
Tandem drawing of wires and tubes is necessary because

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

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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
Delivers molten metal into the mould cavity
Act as a reservoir for the molten metal

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Workshop Technology
A jolt machine is used to

Produce uniform packing of sand in the mould
Produce uniform sand hardness throughout the mould
Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould
Ram the sand harder at the back of the mould and softer on the pattern face

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