Shot peening is a cold mechanical process or technique to improve the fatigue strength of substance by air blasting with small spherical balls. Small dimples are formed on the surface of the peening part by the striking of tiny spherical balls.
The machine is fully automatic. The operator has to place the coil springs over the adjustable leaner rollers on which it rotates and moves forward. The springs enter in the cabinet where a pair of wheels shot peen the coil springs.