Workshop Technology
Swab is used for

Smoothing and cleaning out depressions in the mould
Cleaning the moulding sand
Reinforcement of sand in the top part of the moulding box
Moistening the sand around the edge before removing pattern

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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
Act as a reservoir for the molten metal
Delivers molten metal into the mould cavity
Delivers molten metal from pouring basin to gate

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