Quote:
Originally Posted by akoscielski3
I dont mean to be rude but some of the things you have said here are wrong. :$ And i dont want people to be miss informed when designing a robot chassis.
I have designed many chassis and have been the driver for a couple years now, so I have experience with the 6WD vs 8WD. Though we have never used a 8WD.
6WD chassis do not spin on the middle wheels and what ever else wheel/s it is on. They spin only on the Center wheels, and (if you picture this it will help) "rock" back and forth from the back and front wheels. Making the middle wheels the "Axis" for the turning. In 8WD it is a little different how it moves. It moves with the 4 center wheels, and eliminates the "rock". And makes it a little smoother chassis. But the rock may or may not be a problem depending on how much it rocks. For example this year a 6WD could have made your shot off, by the slightest little bit. 8WD might (most likely) Eliminate that problem.
You contradicted yourself in the second point IMO. As long as 4 of your 6 (in a 6WD) wheels are on the bridge you should not tip. Depends on your COG though. With 8WD you do not have a center wheel to support your robot on the bridge. When 4 wheels are in contact, however (if COG is in center) you have (if wheels are evenly spaced) more than half your robot off of the bridge, and you know what that means...
(I Know I am terrible at explaining things, so sorry)
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Don't be sorry for correcting me
I put this out as I was informed. I like being told I'm wrong, actually, because it's a chance for me to learn. So, first off, thank you!
Secondly, what I think I was trying to say (and I was kinda in a rush when I typed it out), is when you have a drop center 8 wheel drive, you have the two center sets of wheels, and the 2 outer sets of wheels. The robot sits on the 2 center sets, if I'm not mistaken. So that's what the robot is supported by. As long as those wheels sit on the bridge, the robot will not fall over (again, depending on weight distribution). On a drop center 6 wheel, the robot rocks. Depending on where your weight is distributed, when one set of wheels comes off the bridge, the weight of the robot starts leaning in that direction. Thus, the robot falls over. Is this correct? Maybe I'm mistaking what I'm visualizing as an 8 and 6 wheel drive.
As for the rest, thank you for this info. I love the opportunity to learn from those with experience!