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Re: 2583 Off-Season Drivetrain Help
If you've never designed a drive before, use dead axles everywhere -- even if your team has done it before, tackling a drive with live axles the first time out is a lot to handle. It seems like you don't have a lot of machining resources and that you're relying on off-the-shelf parts; that's a good decision. Using live axles with cantilevered wheels offer you ZERO benefit and will make your life miserable.
Why are you using timing belt instead of chain? The timing belt pulleys will require work to adapt them for use in all cases -- a set screw isn't good enough to drive a live axle in FRC applications and they're not easy to bolt onto a wheel for a dead axle. In some models, you show a hex-bored timing pulley; can you broach the hex bore? You won't find a timing pulley with a hex bore available commercially. There are lots of existing options for chain sprockets that fill those roles, however.
If you decide to use timing belt; do you have a belt length in mind? Make sure a commercially available belt can fit the distance between those pulleys or you'll spend a small fortune for custom lengths.
If you insist on using live axles (you shouldn't; it's a terrible idea at this stage), you have to give a lot more thought to retaining your power transmission components axially. What stops things from sliding along the axle? What stops the axle from sliding out of the bearings? What stops the bearings from popping out of the channel? How much did you undersize the holes in the aluminum tube? How are you going to accurately make holes of that size? If you can't key a shaft, you probably can't make press-fit bearing holes.
Check out your gear ratios. The Toughbox Mini's standard 12.75:1 reduction with what appear to be 4" wheels is probably too much. Consider getting a different gearset for a lower ratio.
Start simple. After you succeed, try something more challenging. It is unwise to try to mimic 254 et al on your first go around.
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--Madison--
...down at the Ozdust!
Like a grand and miraculous spaceship, our planet has sailed through the universe of time. And for a brief moment, we have been among its many passengers.
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