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 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.
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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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Metrology
Re: Metrology