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#61
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Re: mecanum vs. omni
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#62
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Re: mecanum vs. omni
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#63
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Re: mecanum vs. omni
I finished my prototype VEX mecanum wheel this weekend. It's definitely under $20, not VEX competition legal (we can always hope the spacers come in the kit right?), and currently far from perfect since I need to file more metal down and figure out roller spacing that's off by minute amounts.
I'll post a pic tonight when I get home and put a link here. |
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#64
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Re: mecanum vs. omni
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#65
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Re: mecanum vs. omni
I'll make a full robot to run it around, but it seems sturdy enough:
http://www.chiefdelphi.com/media/photos/28608 |
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#66
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Re: mecanum vs. omni
The forces are the same for omnis and mecanums. The programming is exactly identical, as an omni setup and a mecanum setup with the wheels in the same spot in the corners would turn the motors on and off exactly the same amount of time, and the same outputs. The vectors of mecanums in the same spot are diagonal just like the omnis, and are 100% of the omni's diagonal forces.
Theoretically, they're completely the same, just with different motor/wheel angles and thus different mounting. But like is stated earlier, mecanums' 45 degree wheel/motor angle causes lateral force on the bearings, but can be more easily switched with normal wheels. The rollers themselves hit the ground at the same angle, push in the same direction, and with the same force. They're both just as efficient, neither moves slower. They both push with 71% force forward/backward and left/right, and 100% at a 45 degree angle. You only use two of your motors diagonally though (mecanum or omni) so you go 41% faster fwd/back/sideways. Because the forces are the same, the two have theoretically the same traction if they use the same roller material and size and wheel diameter and number of rollers and both have circular profiles and all of that. Last edited by LieAfterLie : 06-02-2008 at 18:52. |
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