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Mar 1, 2021 at 20:48 comment added Pete W Re: flatness: comment 1: it doesn't need to be ground flat everywhere, just at the high points where there is contact. comment 2: steel frames often can flex slightly to take up slight non-flatnesses. comment 3: a layer can be added between, e.g. rubber sheet. Helps spread out the load too!
Feb 28, 2021 at 19:38 comment added MrsJLO Good point @blacksmith37 - I will emphasis the flatness requirement to the fabricators. Getting a bit nervous now - a "back of the envelope" idea is turning into a lot of precision engineering!
Feb 28, 2021 at 18:20 history answered blacksmith37 CC BY-SA 4.0