Workshop Technology
In piercing operation, the clearance is provided on

Half on the punch and half on the die
Die
Punch
Either on punch or die depending upon designer's choice

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Workshop Technology
Spot welding is used for welding

Butt joints in plates having thickness above 3 mm
Lap joints in plates having 0.025 mm to 1.25 mm thickness
Lap joints in plates having thickness above 3 mm
Butt joints in plates having 0.025 mm to 1.25 mm thickness

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Workshop Technology
The diaphragm moulding machine is used to

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

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