Ok, I turned one of my CNC turning centers into a machine gun, but I really didn't because my firearms expert guy (Dan from Gunlearn.com) warned me that it could be a really bad idea.  So I made it a blank-firing automatic...uh...thingie.  Along the way I was reminded of a very esoteric concept from engineering college which helped save the day!  Well, sort of.  There's some at least semi-interesting stuff in this video that you've probably never seen before.  And there's some stuff that you probably didn't know about, nor wanted to know about, and are now possibly mad that I made you aware of.  Sorry about that.  ;-)