“…Like other optical machining processes, of gadgets, when the amount of material removed from the surface of the workpiece and the material removal function are determined, the residence time, as an input control quantity, is a key factor in determining the residual error in the bonnet forming process [6]. The change of removal function caused by the surface wear of the bonnet head and the "edge effect" in the polishing area also cause great obstacles to the popularization of this technology.…”