I used oil lite bushings for bearings and held them into position with double split setcollars. You could machine these parts from one hunk of metal but I couldn't think of a more simple/fast/cheap method than the above.
The gears were one of the few things I bought just for the project. I originally intended to use a belt drive to counter rotate the shafts; however, a slight amount of run out existed in both rollers (they both arch .015" or so in the center). If they are timed correctly they work together and the slot taper dimentions remain constant down the length. If they are clocked opposed from one another the gap could change .030" in one rotation droping cases into the wrong bin.
Think of the rollers like this rotating from both ends and moving like this )) ((
Vs rotating from both ends and doing this. () )(
Unless you used a cogged belt sooner or later this would occur and it would not sort properly so I went with gears.
Edited by jmorris, 10 April 2012 - 01:35 PM.