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Efficient fine finishing of optical glass has been conducted by using a newly-developed setup which realizes the finishing of the non-contact type polishing with tin wheel floating by the effect of fluid lubrication. The polishing is made by using an electrophoresis phenomenon of fine grain in the water. when the electric power of DC voltage is supplied to the tin wheel rotating in the polishing compound, the grain concentrates on the wheel surface and causes the grinding action in a sense to the workpiece surface Experimental results show that the stock removal rate increases after first decreasing with the applied potential. It is found, however, that applied current intensity has little effect on the stock removal. The characteristics of polished surface have been exmined by AFM. The microtopography of the surface polished with fine abrasive grain indicates that the surface roughness of the order of nanometers is obtained even in the case that high voltage is supplied

Ultra Fine Finishing of Optical Glass Using Electrophoresis Phenomenon.