Prepping tube joints
I've seen Ron Covell demonstrate in one of his DVDs the use of ball end mills for prepping/notching tubing joints for motorcycle frames.
The idea is you select a ball end mill the same diameter as your tube (say 1-1/4"), set the tube to be notched in your milling vise at the appropriate angle and mill the tube end. The milling cutter notches out the tube and gives you a very tight fit, and hopefully a strong joint when you weld it.
Seemed like another good excuse to buy a milling machine to me.... :biggrin: