Workshop Technology
Scribing block is used to

Check the trueness of flat surfaces
Locate the centres of round bars
Hold the round bars during marking
Check the surface roughness

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Workshop Technology
Piercing is an operation of cutting

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
A number of holes evenly spaced in a regular pattern on a sheet of metal
A flat sheet to the desired shape

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