Abstract

Summary The typical 11 kinds of optical glasses have been ground by the ultra-precision surface grinder having a glass-ceramic spindle of extremely-low thermal expansion with various cup-typed resinoid-bonded diamond wheels of #200-#3000 in grain size. All kinds of glasses can be ground in the ductile mode and the surface does not contain a micro-crack under the surface. The surface roughness is related with grain size, feed per wheel revolution and glass material, not with depth of cut. Super-smooth surfaces less than 0.2nm rms. 2nm Rmax have been obtained by the ultra-precision grinding.

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