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Unread 15-05-2015, 11:52
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KeeganP KeeganP is offline
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Re: pic: Manually machinable one-speed gearbox

So it sounds like the consensus here is that to do a Texas Tube design, you must keep all of the axles horizontally inline, and just put smaller diameter wheels on the outside to create a "drop center." I've been throwing together designs in CAD for different drivetrain styles, and I wonder if someone can explain to me if this would or wouldn't work:


(sorry for the poor render quality)

Rather than dropping the center or raising the outsides, I did both. I lowered the middle 1/16" and raised the outsides by 1/16", to end up with a
"drop" of 1/8". From everything I can see and read, this would fit very snugly into a 1x2x.125 tube. It's completely COTS and would let you use 4", 6", or really any other size wheel anywhere on the drivetrain -- which is big for teams with few resources.

General specs:
2"x1"x.125" aluminum tube
AndyMark Toughbox-Mini gearbox (alum plate cut down slightly)
17t #25 Team 221 dual sprocket
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