Workshop Technology
The teeth of hacksaw blade are bent

May be bent in any direction
Towards right
Alternately towards right and left and every third or fourth left straight
Towards left

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Workshop Technology
Notching is the operation of

Bending a sheet of metal along a curved axis
Cutting a sheet of metal through part of its length and then bending the cut portion
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

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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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