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

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

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Manufacturing And Production Technology
The facing is an operation of

Embossing a diamond shaped pattern on the surface of a workpiece
Reducing the diameter of a workpiece over a very narrow surface
Beveling the extreme end of a workpiece
Machining the ends of a workpiece to produce a flat surface square with the axis

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