> From: andy pugh [mailto:bodge...@gmail.com] > On Thu, 7 Jul 2022 at 21:48, Jon Elson <el...@pico-systems.com> wrote: > > > Doing some calculations on that, I get that 30A (peak > > rating) will get 5110 Lbs linear force on every axis. I > > guess this is needed to get good acceleration on the XY axes > > due to mass of table and saddle, but that seems VERY > > dangerous to the spindle bearings. > > I think you might be underestimating the bearings. > > If we assume that they are 40mm bore angular contact bearings: > > https://simplybearings.co.uk/shop/p20530065/UKF-719USS40A21I1L-Super-Precision-Angular-Contact- > Spindle-Bearing-40x62x12mm/product_info.html > > Rated dynamic load (for a single bearing) is 10,800N or 2500lbf. > > So you wouldn't want to go to 5000 bushel-cubits[1] very often, but > it's not orders of magnitude out. > > [1] Don't bother, it's not dimensionally correct, > At least you aren't using the antiquated Furlongs per Fortnight.
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