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Unread 23-08-2011, 20:11
davidthefat davidthefat is offline
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Re: motorized robot carts

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Originally Posted by 1502 View Post
Our team has had this wheelchair based cart for 7 years now. Any questions just ask me.

http://www.flickr.com/photos/66721945@N04/
Is it safe? It looks like the robot can roll off anytime
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Unread 23-08-2011, 20:32
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Re: motorized robot carts

Yes its really safe. Theres a lip all the way around and I hold onto the robot while driving. Drives like butter on flat ground, like a snake on angled.
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Unread 23-08-2011, 22:28
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Re: motorized robot carts

hmm, I've never driven a snake before, care to elaborate?
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Unread 23-08-2011, 23:37
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Re: motorized robot carts

Strait line speed is slow unless zig-zagging is pleasurable O.o
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Unread 23-08-2011, 23:41
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Re: motorized robot carts

I am working on CAD-ing a mecanum drive cart for production during our preseason. Shall use old robots electronics. Photos when done.
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Unread 24-08-2011, 13:00
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Re: motorized robot carts

Question regarding any carts in general. We had a less than stellar cart last year and we had trouble going over the bumps that covered the wires on the ground. How did you guys overcome that problem?
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Unread 24-08-2011, 13:03
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Re: motorized robot carts

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Originally Posted by davidthefat View Post
Question regarding any carts in general. We had a less than stellar cart last year and we had trouble going over the bumps that covered the wires on the ground. How did you guys overcome that problem?
1. Make sure you have ample ground clearance (4+ in.)
2. Bigger tires go over bumps easier, so having a relatively large wheel size helps.
3. To go along with 2, a tire with some give also makes the transition over a bump less severe, so pneumatic tires work extremely well for that.

McMaster P/N# 22925T71 also comes in a rigid form factor that allows you to use the ideal steering setup of 2 casters and 2 fixed wheels.

Hope it helps.

-Brando
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Unread 24-08-2011, 14:16
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Re: motorized robot carts

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Originally Posted by 1502 View Post
I am working on CAD-ing a mecanum drive cart for production during our preseason.
Probably a bad idea on non-flat terrain. And there's just enough non-flat terrain at a FIRST event to make this troublesome—cable raceways, floor protection panels, small ramps, etc.. I suppose it wouldn't be a huge deal if you can just push it to overcome those obstacles.
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Unread 31-10-2011, 00:12
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Re: motorized robot carts

I thought of that and our mec's have large enough rollers and a sufficent diameter for wires. We also will use a pnematic suspension on the rear two wheels to accomidate non flat surfaces. But in the end our 4 super cims should power through the bumps

And we have no problem going over 4 inch bumps on our wheelchair powered cart. Ground clearence, grippy/large tires and way to much power is key.
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