Workshop Technology
In piercing operation, the clearance is provided on

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

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Workshop Technology
The purpose of a riser is to

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

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