Designing a "belt + roller" conveyor for balls

[Lil' Lavery]

Originally Posted by Greg Needel

so here is another question, what diameter rollers do you all like to use? I know that there are minimum diameters for the different thicknesses of polycord, but I have never fell upon a standard roller diameter that seemed to work better than others.

IIRC, slightly more than 1.9" (OD of Sc40 1.5" PVC).

Going into further detail, we then wrap the 1.5" PVC with shelf liner. We create our spacers/grooves by using rings of 2" PVC over that assembly.

We used this approach in 2009, 2012 and 2013, and were largely happy with it. We still get some amount of wandering polycord, but it's not really a big deal.