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.
The room we moved our robotics group into was the university's old metrology lab -- lovely air-conditioning and humidity control natch. The cupboards were another matter, including a venerable open container of mercury that, we discovered was used of old for mirroring flats for optical testing of surfaces with a sodium lamp and a knife-edge. This was a bit flatter than most surface plates need to be but it was a metrology lab, not a workshop.
Oooh, real climate control, nice. My robotics group always ended up with crap lab space in the sub-sub-basement, but that's what happens when you don't really have a source of funding.
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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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Metrology
Re: Metrology