Which of the following is non-chip
removal process?
Spinning on lathe
Milling
Thread cutting
Gear hobbing
Spinning on lathe
Spinning is a cold forming process in
which a rotating disk of sheet metal is shaped over a mandrel. Localized
pressure is applied through a simple round-ended wooden roller. Therefore, Spinning on lathe is non-chip removal process.
Hence, the correct option is (A).
&Key Points:-
Spin forming of discs :The molding
process in which a sheet metal disc is clamped against a rotating template and
then is forced by means of a pressure roller. This process refines and enhances
the metal's grain structure while improving its smoothness. 
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