Hi All - Made a quick dummy model to simulate the bearing loads. The Co of the 20mm car is 2426kgf. The Bamburg document uses 500kgf for the tool load so shall I. The worst loaded bearings are the front column bearings. They are being loaded all the time in plunge and cutting operations. The simulation shows that these are loaded at around 600-700kgf in these conditions which means the bearing won't fail catastrophically but will wear out over time. So I think the main features are good and I'll make the bearings a bit further apart if I can to give them more margin. Let the design rest for a while then come back to it soon, got to get maximus rolling again.... Cheers Peter