Workshop Technology
A jolt machine is used to

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

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Workshop Technology
Linde welding uses

Neutral flame and leftward technique
Oxidizing flame and leftward technique
Carburising flame and rightward technique
Neutral flame and rightward technique

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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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