Workshop Technology
In sheet metal work, he cutting force on the tool can be reduced by

Increasing the hardness of die
Providing shear on tool
Grinding the cutting edges sharp
Increasing the hardness of tool

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Workshop Technology
Sand wash is a casting defect which

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

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