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14-07-2010 #5I'm surprised how poor I-Beam is in torsion,
As I'm sure you know, for the best stiffness to weight ratio in both bending and torsion you basically want to move the material as far away as possible from the neutral bending axis (and have a closed section for torsion), which means ideally a round tube
I'm also interested in the idea of placing bearings close together - I have been designing to get them as far apart as possible working on the principle that it's not expensive to make the axes a little bit longer and it will reduce the effect of any flex in the bearings. It will also let me put the leadscrews in a convenient position rather than the best place to minimize the forces on the bearings - any comments?
Of course if you are talking linear bearings then you just need to design within there spec and they are much more tolerant of mis alignment and binding than others. IMO Leadscrews/Ballscrews really need to be in the best position tho.
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