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pic: Team XBot Mecanum Practice Chassis
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Re: pic: Team XBot Mecanum Practice Chassis
Looks awesome! The modules look very robust and pretty. Some plating on that thing would make it look like a beast.
I have some questions though. Did you notice any flex in the frame when driving? It looks to me like it is all bolted together. I know people have had problems with frame flex in mecanum drive trains. One of the wheels would lift off the ground, messing up the resultant total force vector, sending the robot in another unforeseen direction. |
Re: pic: Team XBot Mecanum Practice Chassis
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Certainly a great looking protoype, how much does it weigh? |
Re: pic: Team XBot Mecanum Practice Chassis
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Check out http://www.chiefdelphi.com/forums/sh...ad.php?t=49213 for a better description. Each wheel/gearbox pod pivots. The tennis and racket balls are what we are testing out for suspension springs. Right now, we are having more of an issue making the friction in the drive pods equal (we had one really beat up CIM in this chassis). If one wheel takes a second longer to start spinning then the same issue occurs. Overall though our drivers were starting to be able to compensate for the quirks in the movement, so when we get it nice and tuned it should only get better :) |
Re: pic: Team XBot Mecanum Practice Chassis
Looks very nice.
How well does it handle stairs? :) -dave |
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Lavery as in this years game is going to have stairs!? Just playing, thats a really nice frame and set up.
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Re: pic: Team XBot Mecanum Practice Chassis
Beautiful moves! I can't wait to see what the drivers can do with some more practice. One question, any idea why it seems to be so noisy (in the video?) With your custom gearboxes I figured they would be nice and quiet. Or, are the AM Mecanums just that loud? (Sorry for the insinuation Andy/Mark...)
<offtopic> Dave, it's about that time of the year when the real hints start coming our way. Is this your first "plant" here at the forums for us to deal with? </offtopic> Please keep us update with both your mechanical tuning and software tweaking (and methodology, if you will...) Thanks! BEN |
Re: pic: Team XBot Mecanum Practice Chassis
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The wheels, even on carpet, are a bit bumpy because the roller profile only approximates an elliptical shape. More weight may sink the chassis deeper into the carpet and alleviate some of the uneven ride; but that's also contributing to some of the noise you hear. Right now, sans battery, I'd say it weighs about 50 pounds. We'll get an accurate measurement of that tomorrow, we hope. Edit: There's also no grease in the gears. We need to fix that, too. :) |
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lol something that could climb stairs hmmm *tears apart an iBot* MINE CAN NOW |
Re: pic: Team XBot Mecanum Practice Chassis
I'll never get tired of watching one of these guys move. Excellent job getting to this point for sure. As for Dave and the stairs, just ignore him like the rest of the FRC GDC does... ;)
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Re: pic: Team XBot Mecanum Practice Chassis
I was looking at the full-size version of the picture, and it looks like the actual frame is just four lengths of box tubing and two C-channels bolted together. I like the layout--is there more to it, or am I just not seeing it?
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