[Ryan Dognaux]

You can actually press the VEX Versahub into the opening of the AndyMark hub because they're both 1.125" in diameter. The 6 hole bolt pattern lines up with the AndyMark hub and gives you a versapattern to easily mount plate sprockets to.

The smallest #35 plate sprocket VEX sells is the 22 tooth and that's what we went with. Anything smaller and you can't easily attach it to the wheel. We're running what is commonly referred to as 'dead axle' on the outer wheels - meaning we are just rotating the wheels on a shaft instead of rotating the shafts to drive the wheels.

I should also note that we had to drill out all of the VEX components because the AM hubs require a slightly larger diameter bolt. Not a big deal for us and it allowed us to use 10-24 screws to assemble everything.

Attached a few photos, one from our CAD that shows the wheel stack up and one I snapped tonight from underneath the drive itself. The CAD needs to be updated to reflect the use of 1/2 inch versahub sprocket attachment pieces and we didn't use all those hex bearings on the center wheel because it's unnecessary when you use 1/2" hex versahubs. The chains aren't very aligned yet and we still need to cut spacers for the dead axles that allow you to really clamp down on them, but we were able to clear all the static defenses tonight. Feeling good about the drive so far!