Workshop Technology
A jolt machine is used to

Ram the sand harder at the back of the mould and softer on the pattern face
Produce uniform sand hardness throughout the mould
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

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Workshop Technology
In a compound die

Two or more cutting operations are performed at one station of the press in every stroke of the ram
Two or more operations are performed simultaneously at the single stroke of the ram
Both cutting and non-cutting operations are performed at one station of the press in every stroke of the ram
Only one operation is performed at each stroke of the ram

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Workshop Technology
Notching is the operation of

Cutting a sheet of metal through part of its length and then bending the cut portion
Cutting a sheet of metal in a straight line along the length
Bending a sheet of metal along a curved axis
Removal of metal to the desired shape from the edge of a plate

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