Quote:
Originally Posted by Cothron Theiss
If you're using two shooter wheels with a gap in between, I'd probably avoid the dual rails. While in a perfect world this would be fine, the system would be very sensitive to inconsistent loading. But ti all depends on the rest of your system and what you can produce.
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This. We've done both styles (even within a single year), and though I'm sure it can be done well, in my experience it can be a mess in terms of accuracy. The key is that you don't really care if the balls come out in exactly the same position. The +/-x mm of variation there won't really matter. What you do need is balls that come out at exactly the same angle. Over the distance that they'll travel, small differences in angle (especially horizontal) will add up, and that's what makes all the difference. It can have its downsides depending on your design, but flat backing and wide wheel will take a ball and send it straight forward every time.