Patent ID: 6341999
Filing Date: 2002-01-29
Classification: B24B

Abstract:
A method of chamfering surfaces of a doughnut-shaped glass substrate having a circular center hole, the method of chamfering a glass substrate comprising:providing a doughnut-shaped glass substrate having an end surface, a circular center hole, and an oblique surface of each of an outer periphery and an inner periphery, respectively; positioning the glass substrate for processing; processing the glass substrate by grinding, wherein a metal-bonded outer-surface grindstone processes the end surface and the oblique surface of the outer periphery and a metal-bonded inner-surface grindstone simultaneously processes the end surface and the oblique surface of the inner periphery; electrolytically dressing and sharpening the outer-surface grindstone during a processing period; electrolytically dressing and sharpening the inner-surface grindstone during a non-processing period; and replacing the glass substrate during the non-processing period with another doughnut-shaped glass substrate having an end surface, a circular center hole, and an oblique surface of each of an outer periphery and an inner periphery, respectively.