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#16
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Re: pic: McCannot Wheel
Quote:
Last edited by Ether : 17-01-2015 at 14:29. |
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#17
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Re: pic: McCannot Wheel
What if a set mecanum wheels was built that used 2 axles per roller? Since the roller can't rotate about 2 axes simultaneously, there would be no rotation, but there would still be axial free play. Then you could build a set of wheels that is mostly identical, but which uses only one axle per roller to allow rotation. By comparing the 2 wheel sets in situations where the robot strictly moves forward or backward should tell us if there is significant rotation of the rollers in these cases.
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#18
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Re: pic: McCannot Wheel
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Compare the performance of the robot with locked rollers to that with free-wheeling rollers. If there is a difference in performance, I'd suspect it would be due to the rollers... rolling. Jason |
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#19
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Re: pic: McCannot Wheel
If someone really wanted to find this out, grab your favorite 240 FPS camera (smartphone, gopro, etc), put a sharpie line on the edge of each roller somewhere, and drive. You'll know exactly how much each roller spins. Seems easier than building custom wheels, locking wheels, etc.
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#20
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Re: pic: McCannot Wheel
Do rollers spin when going forward? http://vimeo.com/32952134 Is net force (along roller axis) greater than forward force? http://vimeo.com/33315586 |
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#21
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Re: pic: McCannot Wheel
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I wonder how much of the second video discrepancy is caused by the brief moments in the rotation of the mecanum wheel where the traction wheel loses contact. I'm sure not a lot, but it's something to consider. |
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#22
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Re: pic: McCannot Wheel
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#23
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Re: pic: McCannot Wheel
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). I don't have access to this stuff currently, but I'm actually surprised someone hasn't done the sharpie marking with a closeup of a robot moving. Anyone with a good mec drivetrain, sharpie, and smartphone/gopro out there?????? Quote:
Anyone with some |
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