Are you going to match-lap them or scrape them individually?
Ya KNOW... I don't know what materials you'd use for this, but if you could pour cast iron onto some dense liquid with higher mp than iron, you could make float iron and have a crazy flat surface (bar thermal distortion as it cools, I guess...)
The warping issues as it cooled would be a huge problem. I have to assume that is the reason (to the best of my knowledge) no one has ever done this, unlike plate glass on molten tin. And even plate glass isn't THAT flat, not by optical/metrology standards.
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Ya KNOW... I don't know what materials you'd use for this, but if you could pour cast iron onto some dense liquid with higher mp than iron, you could make float iron and have a crazy flat surface (bar thermal distortion as it cools, I guess...)
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not coming up with anything :)
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