Round tubing does not butt up against other round tubes well, and therefore requires a special tube notcher to cut round shapes into it. Square tube is easier to work with because cutting it involves straight cuts at a particular angle. Spaceframes usually use square or round tubing. The diagram also shows suspension and other mounting brackets. Returning to diagram SF1, there are numerous examples in this diagram of how open box tube structures have been triangulated to create a much more rigid chassis. The force applied to the box compresses the cross-member, potentially buckling it if the force is sufficient.
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