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Making a 310mm Zerodur planetary mirror
I took on the job of making an f/5 paraboloid mirror from a supplied Zerodur blank.
The problem is that the blank is 60mm thick and I never worked Zerodur before.
The blank weighs 11.3 kg and needs to be reduced to a thickness of no more than 40 mm to have any chance of becoming a good planetary mirror.
Instead of converting one third of it into ceramic powder, the plan is to salvage some of the surplus material. This is expensive stuff and would be nice to have some off cuts that I can use for other projects.
My largest diamond disc is 9" diameter with a hub diameter of 40 mm, and that allows me to cut to a depth of about 94 mm. Any suggestions?
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