Workshop Technology
When filing soft metals, the file teeth are clogged with minute particles of metal. The file should be cleaned by

Washing it with dilute acid
Rubbing on wood
Washing it with water
Using file card

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Workshop Technology
The purpose of a riser is to

Deliver the molten metal from pouring basin to gate
Deliver molten metal into the mould cavity
Act as a reservoir for the molten metal
Feed the molten metal to the casting in order to compensate for the shrinkage

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Workshop Technology
The diaphragm moulding machine is used to

Give uniform sand hardness throughout the mould
Produce uniform packing of sand in the mould
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

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