Workshop Technology
In piercing operation, the clearance is provided on

Die
Punch
Either on punch or die depending upon designer's choice
Half on the punch and half on the die

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Workshop Technology
The purpose of a riser is to

Feed the molten metal to the casting in order to compensate for the shrinkage
Deliver molten metal into the mould cavity
Deliver the molten metal from pouring basin to gate
Act as a reservoir for the molten metal

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