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[–] 4 points 2 years ago (1 child)

New ball bearings are still likely significantly smoother than the earth. Old worn out ball bearings might be rougher.

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  • [–] 3 points 2 years ago*

    After doing a bit of digging it looks like Earth would be comparable to a 1 inch grade 1000 ball bearing.

    mobile link, sorry

    God damn ball bearings get down to some crazy high tolerances.

    I'm happy I dig some digging into it.

    Edit: Grade 1000 is a really low grade ball bearing, thought I should clarify that.

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