Workshop Technology
Notching is the operation of

Bending a sheet of metal along a curved axis
Removal of metal to the desired shape from the edge of a plate
Cutting a sheet of metal in a straight line along the length
Cutting a sheet of metal through part of its length and then bending the cut portion

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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
Act as a reservoir for the molten metal
Deliver the molten metal from pouring basin to gate

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