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Unread 13-02-2011, 18:59
Tyler Olds Tyler Olds is offline
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Wave Robotics 2826 Mini-bot 1.45 sec!

Check out Wave Robotics' latest mini-bot design! Shot in real-time HERE and at 420 FPS HERE or just check out our channel HERE.

Note: Battery is on the mini-bot; only thing that is tethered is the switch to turn the mini-bot on and off.

Deployment mechanism to be coming soon!

P.S. Sorry about the low res ]
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Last edited by Tyler Olds : 13-02-2011 at 19:20.
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Unread 13-02-2011, 19:28
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Re: Wave Robotics 2826 Mini-bot 1.45 sec!

nice jw is you team using magnets or two small wheels and just a battery
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Unread 13-02-2011, 22:16
Tyler Olds Tyler Olds is offline
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Re: Wave Robotics 2826 Mini-bot 1.45 sec!

Quote:
Originally Posted by bearbot View Post
nice jw is you team using magnets or two small wheels and just a battery
Good question! We are using custom "wheels" with no magnets. Really it just comes down to the physics behind the challenge. What really helped us was understanding the motor power curves, increasing the traction interface to the pole, and having the right amount of applied power to weight ratio for the mini-bot.
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Unread 14-02-2011, 13:20
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Re: Wave Robotics 2826 Mini-bot 1.45 sec!

Just wondering, how do you plan to start the minibot for deployment?
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Unread 14-02-2011, 14:33
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Re: Wave Robotics 2826 Mini-bot 1.45 sec!

Sweet !!
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Unread 14-02-2011, 14:40
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Re: Wave Robotics 2826 Mini-bot 1.45 sec!

Quote:
Originally Posted by Tyler Olds View Post
What really helped us was understanding the motor power curves, increasing the traction interface to the pole, and having the right amount of applied power to weight ratio for the mini-bot.
How did you provide traction on your custom "wheels"?

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Unread 14-02-2011, 15:41
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Re: Wave Robotics 2826 Mini-bot 1.45 sec!

Mr. Van, I can provide a few hints on the traction material, but don't want to give away the farm quite yet. Plus, what fun would it be if I just told you. ; )

1. The material is 100% legal,
2. The material is not in the Tetrix parts makeup
3. The material has a higher coefficient of friction to steel than rubber (thus is not rubber)
4. The material can be easily found online with the right magic words

The real trick in increasing the traction was making sure we were applying the force to the pole normal to the axis of rotation of the wheel. Our first ten or so protos were a failure (or at least a relative failure) because we were dramatically overthinking the retaining mechanism.


I promise that we will divulge everything at the Wisconsin Regional in week 2. Of Course, by then, everyone will probably have a 1 second minibot and we will be behind the ball.
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Unread 14-02-2011, 18:59
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Re: Wave Robotics 2826 Mini-bot 1.45 sec!

Did you make your wheels out of Polycarbonate? I'm looking at the list of materials usable on the minibot, and that is the only thing I've seen used as wheels. Not sure about the traction on them, because I don't think anyones ever compared it straight to rubber.

EDIT: Just thought, you could put a nonslip pad (that comes in a roll so it would be easy to put on where the rubber would be of a regular wheel, these still being made of polycarbonate), that would have better traction than rubber.

Last edited by Gatlin18 : 14-02-2011 at 19:09.
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Unread 15-02-2011, 01:02
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Re: Wave Robotics 2826 Mini-bot 1.45 sec!

No Non-slip pad or Polycarb. No aluminum in the wheels either
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Unread 15-02-2011, 02:06
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Re: Wave Robotics 2826 Mini-bot 1.45 sec!

Inverted surgical tubing? I really have no idea!

This video is going to be the source of inspiration for our minibot team, which is just starting to push 3 seconds.
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Unread 15-02-2011, 02:22
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Re: Wave Robotics 2826 Mini-bot 1.45 sec!

Very impressive, will be interesting to see how it holds up against the competition
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Unread 15-02-2011, 02:45
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Re: Wave Robotics 2826 Mini-bot 1.45 sec!

Are you using rolls of electrical tape as wheels? Also, did you remove the standard tetrix gearbox, and if so, what did you replace it with?
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Unread 15-02-2011, 07:27
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Re: Wave Robotics 2826 Mini-bot 1.45 sec!

Polyurethane wheels
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Unread 15-02-2011, 11:34
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Re: Wave Robotics 2826 Mini-bot 1.45 sec!

As far as I know, Polyurethane is not on the approved list, so from our view, no, they are not polyurethane

We did try electrical tape and many varieties of heatshrink tubing, but none gripped well enough for our purposes.

The only thing I will comment on the gearbox is that it is so incredibly inefficient that you are losing more than 60% of your potential tractive energy inside this box. This is one of the main reasons that we are seeing so many smoked gearboxes. We have destroyed 3 of them ourselves. They need to be dramatically improved
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Unread 15-02-2011, 11:40
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Re: Wave Robotics 2826 Mini-bot 1.45 sec!

One major clarification on the timing illustrated in this post: The 1.45 seconds was our fastest recorded time, with our slowest recorded time at 1.67 seconds. The video that was posted was a 1.6 second run. We have good reason to believe that the next proto iteration we are testing tonight should approach the 1.25 second mark.


Anyone that breaks the 1 second mark, please post that it is possible. I know in theory, the math and physics support it, but ... well I don't need to finish the comment.

Right now we are treating the one second mark akin to the sound barrier and X1. We know it should be possible, but we will believe it when we see it.


As for deployment, we have a pretty robust system in place and is easily under 1 second. We will most likely have to tune the "launch" down a bit to prevent destroying our minibot.

Last edited by trilogy2826 : 15-02-2011 at 11:42.
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