Why not at the top? Wouldn’t a side to side brace at the top be the most effective because of the mechanical advantage?
you are correct that the higher the brace, the more stability it would add, but you really don’t need to have a brace at the top for a good amount of rigidity. And keeping the braces lighter and nearer to the bottom improves the robots acceleration and center of mass.
Its good to keep in mind that very little force will be applied to these towers, so prioritizing lightness over rigidity to some degree is a good idea. If these towers were for something like a lift, I would agree completely that high on the robot c channel braces are in order.
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