Workshop Technology
Shift is a casting defect which

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

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Workshop Technology
Riddle 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 moulding box

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