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

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

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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 sideways
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 towards back
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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