Quote:
Originally Posted by JesseK
The major flaw I saw at champ's with design that Alex posted is with the side rails -- the ones that are supposed to back the bumpers.
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We found an cool way around having to deal with welding that super structure. The bumper mounts are pictured below and were relatively easy to use, although next year we may update the design a bit.
That is our drive base from this year fresh from the welder. (You can see the welds aren't even ground down.) 3"x1.5" tubing that is 1/8" thick doesn't require bearing blocks, and internal belts are easy to change with the window above the center wheel. This DT is REALLY simple and it doesn't even require CNC milling (although it is nice). Virtually no maintenance was required and our 9mm wide belts held up fine for 2 regionals.
Above is a concept drive based on our "WCD" from this year. Custom 3" wheels only require a single 12:56 reduction in the gearbox to go 12 fps. (The 56 tooth gear is ~2.8" in diameter so there is little ground clearance, but it is right behind the wheel anyways. The tubing is also only 2"x1") It weighs somewhere in the low 30s with CIMs and w/o the shown arm superstructure. I'm working on getting a similar sheet version out soon. Basically this is a lighter and simpler version of our robot this year (which weighed a whopping 98 lbs.)
Feel free to contact me for any CAD.