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Unread 26-01-2017, 00:47
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MIssin' the MItten
AKA: Erik Boyle
FRC #4640 (Metallic Panthers)
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Re: Polycord and polycord pullies

Quote:
Originally Posted by Bob Steele View Post
In the past we have also used a piece of PVC pipe and glued on more PVC pipe cut from connectors as spacers between the belts. We put a hub inside the pipe on both ends and ran an axle through it. This worked OK but was not optimal although it was pretty cheap to make. The belts all drive together but you will have to put a sprocket on one of them connected to the motor (with chain) to put power to the whole assembly.
Back in 2012 we used 1.5" OD x 1/16 wall round aluminum tubing with strips of roughtop tread as spacers. We riveted in endcaps made of nylon and tapped them for 1/4-20 bolts, which served as the axles. The powered rollers had a hex broach on one side instead. I want to say we gave 6% stretch on the polycord. We used the green belts, which are supposed not to catch and come off track because of their rough surface, and in my experience that's pretty much true. That system worked like a charm forever.
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