I have Bendtech Pro which prints out a template wrapper that you can just click on the joint of the project you designed and print out the given notch wrapper, wrap it on the tube and cut 'er out. Works well if you've made your project in the program.
Now that is what I am talking about.. All the guess work done for you, only if you used the software to model your cage of course. The CNC coping/notcher technology using lasers is kinda cool..