Workshop Technology
Sand wash is a casting defect which

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

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Workshop Technology
A jolt machine is used to

Ram the sand harder at the back of the mould and softer on the pattern face
Produce uniform sand hardness throughout the mould
Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould
Produce uniform packing of sand in the mould

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