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#31
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Re: Omni Wheels Survey
Wildstang has used a variety of different designs for omni wheels over the years. We scratch build our own and have modified the design each time we used them. This year we used two driven omni (we call them BUPODfor Biased UniPlanar Omni Directional) and two crab drive modules for four wheel drive. In crab from side to side we had to add some software to help the robot drive straight which we called "Drive Straight". The omni wheels tend to go where they want when they are not driving.
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#32
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Re: Omni Wheels Survey
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#33
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Re: Omni Wheels Survey
If the mecanum wheels produced 100% power in the forward or reverse direction, it would be impossible to strafe. We know that this setup can strafe, so the power must be in the direction that the rollers are facing.
Another proof is to watch a video of a holonomic platform with mecanum wheels. Watch what happens when 2 wheels on a diagonal are powered. The robot moves in the direction that the rollers are facing. |
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#34
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Re: Omni Wheels Survey
George, i know 1083 wants to try to build its own omniwheels next year and i was wondering if you were planning to make them bigger than those 4.72" ones from omniwheel.com. I can't actually think of a valid reason why wheels that small are bad, but very few teams seem to use wheels that small, so there is probably a reason. Maybe a larger wheel gives you the potential for better traction. (yes, i know in theory traction is only dependent on the weight of the robot and the materials contacting each other, but in practice, it isnt that simple) Your grooved omniwheels seemed to have better traction than any others, bought or built.
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#35
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Re: Omni Wheels Survey
sorry i took so long replying...
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<hare-brained idea> on that note (prop. blades) i'd also like to throw out an idea that i got from watching the bots strafe back and forth. what if you were able to change the angle of the rollers? decreasing the angle would move you less distance per each "wheel" rotation, but would give you more pushing force.the angle of the rollers could be changed by a mechanism similar to the ones used to change the blade pitch on prop. aircraft. </hare-brained idea> |
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#36
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Re: Omni Wheels Survey
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That's probably the best argument for us using them again in the future. |
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#37
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Re: Omni Wheels Survey
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Thank you, Jake Mazotas |
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#38
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#39
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Re: Omni Wheels Survey
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sry george meaning that nobody made wheels like us-- design that james came up with and that i got to help make and well yeah get to fix them again ![]() |
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#40
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Re: Omni Wheels Survey
We (X-CATS 191) used Omni wheels for the first time this year as well... They worked very well and we even made them from scrath recycling old copier parts we pulled out of some dumpster. I'll have to get some closer pictures for ya.
We made an 8 wheel drive system that walked up the platform. It worked well except for the side traction when we were halfway up a step and then we had issues sliding.. Oh well you live and learn... Ellery |
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#41
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Re: Omni Wheels Survey
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#42
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I think everyones forgetting (or you just werent around) one of the proven bots out there with large omni wheels and they happend to use 6 of them they went in all directions they didnt get pushed around and there was no easy side to push them from they turned marvelously and speed and power to boot
MIM Metal in Motion 343 2002 bot still one of my fav robots of all time check them out and youll see there design ... i wanted to build something like that but i couldnt get the whole building omni wheels thing started any suggestions or things only expirience teaches u when building this nice lil wheels? things i should watch out for when tyring to build and use them? Last edited by SpaceOsc : 30-04-2004 at 13:07. |
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#43
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Re: Omni Wheels Survey
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#44
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#45
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Re: Omni Wheels Survey
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