Workshop Technology
In sheet metal blanking, shear is provided on punches and dies so that

Press load is reduced
Warping of sheet is minimized
Good cut edge is obtained
Cut blanks is straight

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Workshop Technology
Riddle is used for

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

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