Sturdy and Fast all Steel CNC , my first build

[njhussey]

In practice, any idea of how much out of true a typical length of, say, 50x50 or 80x80 steel tube would be? Are we talking about a mm or two, or significantly less than that? How much does the epoxy thickness vary, in other words?

This should help http://www.parkersteel.co.uk/media/p.../JPSBS0010.pdf I was looking for it yesterday when I wanted to look at how "true" my beam might have been. Don't forget you're also at the mercy of the stockholder and transport to keep the steel flat and not to induce any additional bending/torsion etc...