Quote:
Originally Posted by pntbll1313
All very good points! I don't claim to be a physics expert. I am not. That's why I asked Ether to give me some numbers 
Again we were never trying to push in the sideways direction. Our video does not show us winning too many big pushing matches. Mecanum allowed us to avoid those situations. We did not choose mecanum for its pushing power haha, nor do we generally use it for such things. The video is just meant to show some examples of how we used mecanum to our benefit this year, and to hopefully show it's not as weak of a drivetrain choice as it is in most CD'ers minds. No one (hopefully) chooses mecanum for traction purposes. We just wanted to highlight some of our match videos because people cited us as a good example of mecanum. |
No problem. I think the discussion just got sidetracked because I (perhaps also Ether) was worried that teams--who would otherwise be influenced by the video in very positive and correct ways--might take these statements the wrong way:
Quote:
Originally Posted by pntbll1313
...I would bet we are at least as hard if not harder to push sideways when we are strafing into the hit than a tank drive...What we have found is that when you push a tank robot sideways the only thing stopping them is their static friction with the carpet. When we get pushed sideways we can provide a force in the opposite direction to the push...Our force we apply with the motors I feel cancels out the slip of the rollers, leaving still static friction with the carpet. Which makes us just as good as tank if they have the same CoF.
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Particularly the clarity of the last one, as it's contrary to the actual geometry of mecanum wheels.
Also, I seem to have distracted the thread from Mr. Elston's very good questions:
Quote:
Originally Posted by Chris_Elston
How much did your robot weigh?
Do you know the ratio of the gearboxes you were using with the 8 inch mecanums?
Is there any special software or sensors you guys used in conjunction with the drive system such as a gyro or field oriented control?
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Sorry
