ballen
Diamond
- Joined
- Sep 25, 2011
- Location
- Garbsen, Germany
I need to reduce the OD of a glass doublet lens from 51mm to 37mm. The lens is crown and flint glass cemented together, total thickness 8-10mm.
I was thinking of doing it on my cylindrical grinder. I mount the lens between centers in a way that holds it true, probably a turned plastic holder on either side of the lens, with double-sided adhesive tape. I don't have a 300mm diameter diamond or CBN wheel, so would use the internal grinding spindle with (say) a 25mm diameter diamond grit wheel and flood cooling. The outside finish of the lens doesn't matter, so I was thinking coarse grit 46 in a sintered metal matrix or resin bond.
Has someone out there (Buck?) done something similar? What sort of wheel and rpm would be good? Or is this just a complicated way to make a pile of glass shards?
I was thinking of doing it on my cylindrical grinder. I mount the lens between centers in a way that holds it true, probably a turned plastic holder on either side of the lens, with double-sided adhesive tape. I don't have a 300mm diameter diamond or CBN wheel, so would use the internal grinding spindle with (say) a 25mm diameter diamond grit wheel and flood cooling. The outside finish of the lens doesn't matter, so I was thinking coarse grit 46 in a sintered metal matrix or resin bond.
Has someone out there (Buck?) done something similar? What sort of wheel and rpm would be good? Or is this just a complicated way to make a pile of glass shards?
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