Workshop Technology
Lancing is the operation of

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
Bending a sheet of metal along a curved axis

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Workshop Technology
The diaphragm moulding machine is used to

Ram the sand harder at the back of the mould and softer on the pattern face
Produce uniform packing of sand in the mould
Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould
Give uniform sand hardness throughout the mould

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Workshop Technology
Piercing is an operation of cutting

A flat sheet to the desired shape
A cylindrical hole 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 hole (other than cylindrical) in a sheet of metal by the punch and the die

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