Manufacturing And Production Technology
The primary purpose of a sprue in a casting mould is to

Feed molten metal from the pouring basin to the gate
Help feed the casting until all solidification takes place
Feed the casting at a rate consistent with the rate of solidification
Act as a reservoir for molten metal

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Manufacturing And Production Technology
Threading is an operation of

Smoothing and squaring the surface around a hole
Cutting helical grooves on the external cylindrical surface
Sizing and finishing a small diameter hole
Producing a hole by removing metal along the circumference of a hollow cutting tool

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