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Unread 18-04-2007, 21:48
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Re: pic: 1683 8 wheel drivetrain completed

We used bushings this year and they seemed to work very well. Switching out to bearings would work but the cost would be much greater, also how thin of bearings can you buy? I am wondering because the plates are only .25" thick. I do agree that they would probably be more efficient, but honestly bushings worked so well for us and really didn't have much friction. I will definitely look into bearings though.
The total weight for the drivetrain is around 40lbs. I believe each module is about 17lbs in inventor. That weight is with motors. It uses the andymark 2 speed transmissions, and on the design as pictured the speeds are around 5fps and 12fps, but we might up the speed a little.
The 2 middle wheels are lowered on each side to provide some rocking effect. There shouldn't be much problem with it turning as the middle wheels have a larger track width than the length. Essentially it is a wide 4 wheel drive base which generally doesn't have any problems.
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