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Unread 11-05-2010, 10:53
Andrew Schreiber Andrew Schreiber is offline
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Re: pic: 3 Hour Drivetrain

Quote:
Originally Posted by ttldomination View Post
There is no reason to debate this at all. They wheels need to be offset or your robot will not turn. Or it might turn, but you'll noice considerable hopping as your bot attempts to overcome the extreme friction beween your wheels and the carpet.

My team tried a simple 4WD with tracion wheels on all four axles, and that they hopped. Without a dropped middle wheel, your problem would be significantly worse.
The 6wd thing isn't ALWAYS true. 25 does a 6wd without dropping them but I don't know how. He can also do some other tricks to simulate the drop such as using a thicker tread. Personally I would drop the wheels.

I would also suggest you use some triangular bracing (look http://www.chiefdelphi.com/media/photos/31597 for an example) The cross members look like 1/8", how big are they? I would use 1/16" 1x1 and not lighten it.

Be prepared to change the tread on those back wheels a lot. with the battery and 4 cims back there your CG should be behind your middle wheel.

I like it.
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