Workshop Technology
The teeth of hacksaw blade are bent

Towards left
Towards right
Alternately towards right and left and every third or fourth left straight
May be bent in any direction

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Workshop Technology
A jolt machine is used to

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

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