Well, I'm about a decade late to having this capability, but I finally do. I purchased a midsized chinese milling machine, added precision doublenutted ballscrews, and stepper motors on all axis and built myself a CNC machine. My first project out of the gate was to do a simple boring of a set of cases. Well, it turned out to be not as simple because I didn't have enough height to use my boring tool. I guess that would have been too easy, so I instead just chucked up a 3/8" endmill, programmed the circle, and gave it a pass. Perfect. I say that it actually took less time to do the setup, program it, and run the program that it would have taken me to die grind it. And the mess is completely contained! The results speak for themselves. Perfect!