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#1
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Re: pic: Manually machinable one-speed gearbox
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I do have more questions though. How would you get a continuous loop of chain without a master link? My team has only ever used master links with our chain. Last edited by Dan Petrovic : 15-05-2015 at 10:09. |
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#2
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Re: pic: Manually machinable one-speed gearbox
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http://www.team221.com/viewproduct.php?id=70 Follow these steps: http://www.billetboard.com/showthrea...oul-Chain-Tool First year using one and it was one of the best things we purchased this year. We had 50+ feet of 25 chain on our robot and only had four master links where our elevator platform connected to the chains. Using lighter chain (25 over 35), no master links, and C-C distances has really make working with chains an easy process and eliminated a lot of my worries in the past two seasons in our mechanisms.Last edited by BrendanB : 15-05-2015 at 10:19. |
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#3
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Re: pic: Manually machinable one-speed gearbox
We did #25 chain in 2x2x.125 tube on our drop-center 6WD this season and had a good experience. No maintenance all season. There was some chain slap against the tube initially (16T sprockets and long chain runs; not a real problem but noisy), so we slid in a strip of UHMW to dampen that and now you'd never know.
We used a 2x2 because the frame rails in our design had minimal cross bracing due to the large opening for acquiring game pieces. |
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#4
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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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#5
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Re: pic: Manually machinable one-speed gearbox
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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#6
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Re: pic: Manually machinable one-speed gearbox
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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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#7
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Re: pic: Manually machinable one-speed gearbox
Did you have the issue that 118 mentioned earlier of the chain grinding on the outer bearing race?
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#8
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Re: pic: Manually machinable one-speed gearbox
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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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