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Unread 15-05-2015, 11:52
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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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Unread 15-05-2015, 11:58
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Re: pic: Manually machinable one-speed gearbox

Quote:
Originally Posted by KeeganP View Post
So it sounds like the consensus here is that to do a Texas Tube design, you must ... Put smaller diameter wheels on the outside to create a "drop center."
You can also use omni wheels on the outside wheels, especially in a game with little or no pushing and defense like this year.
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Unread 15-05-2015, 12:17
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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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Unread 15-05-2015, 13:21
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Re: pic: Manually machinable one-speed gearbox

Quote:
Originally Posted by Nate Laverdure View Post
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
Did you have the issue that 118 mentioned earlier of the chain grinding on the outer bearing race?
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Unread 15-05-2015, 13:24
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Re: pic: Manually machinable one-speed gearbox

Quote:
Originally Posted by Knufire View Post
Did you have the issue that 118 mentioned earlier of the chain grinding on the outer bearing race?
No, in fact we deliberately chose the 2x1.5" tube to avoid this issue with the 16t sprockets.

Here is a technical drawing of (an early version of) our drive tube.

Last edited by Nate Laverdure : 15-05-2015 at 13:28.
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