Workshop Technology
Riddle is used for

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

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Workshop Technology
The purpose of a gate is to

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

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Workshop Technology
Sand wash is a casting defect which

Results in a mismatching of the top and bottom parts of a casting
Occurs as sand patches on the upper surface of a casting
Results in general enlargement of the casting
Occurs near the ingates as rough lumps on the surface of a casting

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