I tried grinding optical glass once. There were cameras inside a heavy walled chamber and they had to see out. I ground it on a regular combo belt and disc grinder. It worked, however I do not recommend it.
When I was younger, I ground a piece of regular glass into a round shape on a bench grinder to make a turkey call. No joke. It was an experiment, more than anything. It worked - and it's possible to do - but you have to take it very slowly and carefully. It's a tedious process.
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