How do you compensate for that? Traditionally, you are going to come down and touch the face with a sensor that marks the contact point. The tube is then rotated, and the opposite side of the tube is touched. That gives the control an idea of just how bowed the tube is. This method is accurate and can ensure those through-holes work out for the application. But keep in mind that each time a rotation of the tube occurs, the ability to deliver very high tolerances is reduced.
The very nature of a tube prevents the need for a machine with a very high-powered laser. Whereas flat sheet laser cutting machines now are available with laser generators as powerful as 12 kW, tube laser cutting machines usually only require a maximum of 5 kW of power. With a tube, you always have to think about the opposite side of the tube you are cutting. A more powerful laser simply would blow through the other side of the tube during cutting. (Of course, if you are processing a beam or a channel on the tube laser you don’t have to worry about another side.)