Workshop Technology
Loam sand is a mixture of

30% sand and 70% clay
90% sand and 10% clay
50% sand and 50% clay
70% sand and 30% clay

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Workshop Technology
The purpose of a riser is to

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

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Workshop Technology
Riddle is used for

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

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