pic: Sheet Metal Drivetrain

[Rion Atkinson]

Originally Posted by apalrd

It appears you dropped the middle wheels. That's good. Then it will probably turn. If you don't drop the center wheels or use omnis on the corners, it won't turn. And that would suck.

Well that's the understatement of the century.

To further on the "not turning" subject though, I can give an example in which shows you that wheel placement and such matters on your turning. I was talking to team 1561, apparently their students had a laps of brain function and took the kit bot and put 4 (Yes that's right, 4) AndyMark Roughtop 8" Plaction wheels. They were shocked when it didn't turn. What was the reason?

When the wheels are that far apart, the inside wheels rotate slow than the outside wheels. <Blah blah blah> That's the whole reason that cars have differentials. Other wise the inside wheel would have to skip. Your wheels have a better chance on slipping when you have a lower coefficient of friction. Well... Roughtop have a coefficient of friction that is rather high. So it will not slip very easily. See the issue with this?

Simple rule of thumb, the closer together your primary driving wheels are, the better your turning. <-Only applies to high friction wheels.

EDIT: Okay, I have to admit; you did a GREAT job with the CAD. How long have you been doing this? IT looks like you are using Inventor though; such a pity.