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pic: Omni Robot
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This is a really cool design nice work. It looks like the frame is made of Lexan or is that just a product of the rendering?
Also whats the green thing in the middle? |
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It is a cool design. It would be pretty darn expensive though. Victors are 150 dollars atleast and the omni's are not cheap. It would be pretty nifty to see this thing in action
-Vivek |
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looks like the green thing in the middle might be a battery cell pack.
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It is made out of 3/16 lexan, the green thing is a 10 D-cell 12v 10AH battery pack.. ill give more details later i gotta go finish my term paper lol
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HB-25 Link provided for aforementioned speed controller. (We have enough Vic's)
Nice design. It looks like it'd be fun to drive. I think we have plenty of Victors in the shop. |
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Depending on the motors used, using HB-25 speed controllers could be an expensive mistake, since HB-25s have about 37% less continuous current capacity than Victor 884s.
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Lexan can also allow for a good amount of "flex" in the frame, which can be good with this style of drive, along with mecanum also.
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Yes, victors are expensive, but when can get them for free because you have so many around the shop, they're the best way to go. That's why he has the blue 60 mm fans on there. The ones he found don't have fans. I'll leave the rest of the explaining up to Max. Haha.
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Since it is an omni-directional drive system, it should be relatively easy to get out of a situation where you are stalling motors. That said, lukevanoort has a good point, when using the HB-25s using some 30A breakers is a very good idea to protect your investment. Remember the breakers for the Victors, too, I'd say. By the way, how fast is this thing supposed to go? |
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If you cant get waterjetting done easily, something like this could be done relatively well with a bandsaw and jigsaw and a wonder file. It would just take longer and not quite as smooth, but it would work.
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Also, make sure you have a way to stop the wheels from spinning. I was the driver this year and we had an omni bot like your design. Trust me, it is really hard to drive, especially if you have no way of stopping the wheels. Joey |
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If your actually looking at this type of drive train for the season I would definitely suggest building this to do some software developments because while it may seem uncontrollable when you first build it they can be made very stable.
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very impressive.
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I use code written by Arthur Dutra that was posted here as the basis for an omni control system. It works well out of the box. Can you post your code, since it sounds like you've put lots of work into it?
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If your interested in looking at our code, PM me with your email and i'll send it to you. Keep in mind that we used the 2007 gyro to stabilize the robot and our machine had a tractor style suspension to keep all four wheels in contact with the ground at all times.
In terms of the suspension I can't entirely say if it absolutely necessary but we included one in all three omni bots that we built. We also used a gyro in all three bots and I can guarantee that it will be uncontrollable if you don't use one of the two, and very possibly both. All of our machine were very easy to drive once the correct constants for the control loop had been found. |
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You took the words right out of my mouth.... :rolleyes: |
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team 1714 used a omni drive and it worked its was a fun system to drive good luck
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yeah it looks really cool!! make sure you don't get thrown off the first few times driving it! it is hard to drive at first, but it is the most fun drivetrain I have ever driven!!! I love the lexan frame too! Whats the thickness of the lexan?? (I may of missed it if it were said somewhere.. sorry)
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