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Unread 15-05-2015, 12:17
Nate Laverdure's Avatar
Nate Laverdure Nate Laverdure is offline
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Re: pic: Manually machinable one-speed gearbox

Quote:
Originally Posted by KeeganP View Post
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
Yes, we've done this. The 1/8" total drop is "shared" equally between the outside and inside axles.

In fact, our entire setup is very similar to this, with only a couple differences:
-- we used 2x1.5x.125 tube
-- we used VexPro 16t #25 sprockets
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