To solve such problems that the inner diameter becomes smaller and the outer diameter becomes larger as the number of processed glasses increases as a result even if a disk-shaped glass is ground by an identical rotary grinding wheel due to increase of the wear amount of the rotary grinding wheel in proportion to the number of processed disk-shaped glasses if NC control is continued with the initial setting without considering surface wear of the rotary grinding wheel when grinding the inner and outer circumference faces of the disk-shaped glass with the NC controlled rotary grinding wheel.
In the manufacturing apparatus for the glass substrate for an information recording medium including a work stand fixing the disk-shaped glass and a grinding tool grinding the inner and outer circumference faces of the disk-shaped glass, the wear amount of the grinding tool is measured to execute feedback control of a relative position of the disk-shaped glass to the grinding tool corresponding to the measurement value of the wear amount. Accordingly, the dimension accuracy can be improved even when the number of processed disk-shaped glasses by the identical grinding tool increases.
Toru Yui
Hitoshi Kiyono
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