Workshop Technology
Swab is used for

Cleaning the moulding sand
Smoothing and cleaning out depressions in the mould
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 riser is to

Deliver the molten metal from pouring basin to gate
Deliver molten metal into the mould cavity
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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