Workshop Technology
A hacksaw blade cuts on the

Return stroke
Forward stroke
Both forward and return strokes
Cutting depends upon the direction of force

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Workshop Technology
Piercing is an operation of cutting

A flat sheet to the desired shape
A number of holes evenly spaced in a regular pattern on a sheet of metal
A cylindrical hole in a sheet of metal by the punch and the die
A hole (other than cylindrical) in a sheet of metal by the punch and the die

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