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
Side relief angle of a single point tool is the angle

By which the face of the tool is inclined towards back
Between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base
By which the face of the tool is inclined sideways
Between the surface of the flank immediately below the point and a plane at right angles to the centre line of the point of tool

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