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

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

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Workshop Technology
Riddle is used for

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

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