I need some help on a gravity fed magazine for my cnc system. What i have is several pieces of pvc pipe that i'd like to stack into a magazine style cartridge that will dispence them out single file order. Kinda like in a chute I have a rough drawing of my idea. What i've discovered is that when you stack the pieces in a radom order with only one way out they become locked by there own geometry and stop the flow. Maybe you (guys or girls) know where i can find some documentation on such a magazine. I know some one out there has already figured out the physcs behind this idea because I'm sure I'm not the first to need this magazine. Anyway have a look at the drawing and you'll understand what I need. The drawin shows some of my ideas that might work?