Quote:
Originally Posted by Whateveryousay
Thank you, we will do the testing really soon. The center wheels are dropped by 1/8'', last year we had trouble turning with 6 wheels all pneumatics and center dropped. We only solved the problem when we center-dropped more than 1/4'', so this year we are going to try this configuration.
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Pneumatics wheels can be very tricky to get to work in a dropped center configuration (just ask 233 about their 2006 robot!) because they squish. This is good for traction, but it can effectively eliminate the "drop" that enables you to turn. Your issue wasn't that all-traction wheels didn't work, but that your center wheel squished down and took away an 1/8" of drop.
You're on the right track to solving the issue by placing a non-pneumatic wheel in the center so it won't squish down, but you don't need an omni there. I think you'll find much better performance if you swap it out for a treaded traction wheel, like the
Plaction or
Performance wheels from AndyMark or a
Traction Wheel from VexPro.
They won't squish down, so you'll still get all the maneuverability of the drivetrain you have with the omni, but they'll have better traction and your robot won't try to turn about the outer edges of the frame.
Hope this helps you guys some, best of luck this year!