Workshop Technology
Swab is used for

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

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Workshop Technology
The purpose of a riser is to

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

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