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

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

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Workshop Technology
Riddle is used for

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

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