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Unread 12-03-2005, 10:26 PM
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pic: it's a Vex Holonomic Drive!

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Unread 12-03-2005, 10:28 PM
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Re: pic: it's a Vex Holonomic Drive!

Very cool, although I must imagine that 4 omni wheels makes it pretty easy to push around.
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Unread 12-03-2005, 10:53 PM
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Re: pic: it's a Vex Holonomic Drive!

Art, you've done it again.

What next? Beatty's 2002 machine in Vex?
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Unread 12-03-2005, 11:22 PM
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Re: pic: it's a Vex Holonomic Drive!

Billfred, don't give me ideas!!!!!

Very cool stuff here. How many motors total are there on that thing??

I just bought a kit and the first thing I did was a 3 motor version of a holonomic drive (two center drive wheels, one motor controlling two perpendicular wheels). Not as good as the real thing, but something to get the kids thinking before the season starts.

Kev
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Unread 12-04-2005, 05:09 AM
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Re: pic: it's a Vex Holonomic Drive!

Am I correct in saying it is NOT super easy to push around because the wheels are not all pointing in the same direction? BTW, have any videos of it driving?
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Unread 12-04-2005, 11:43 AM
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Re: pic: it's a Vex Holonomic Drive!

Coincidentally, I'm on the verge of finishing my own omniwheel robot. I got the chassis together yesterday but haven't actually powered it yet (electronics aren't ready). I was pushing it around and noticed that the traction wasn't great, but it was decent. I think that the problem is it's too light. It probably weighs <2lb. The motors won't backdrive, but it will slide.

I'm using these wheels, by the way.
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Unread 12-04-2005, 11:55 AM
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Re: pic: it's a Vex Holonomic Drive!

I got to see the Holonimic Drive in action yesterday and it was amazing. Very sleek movement and it seemed like the drivers handled it fairly easy. We wont even go into the beauty of the rest of the robot. Unfortunately they were not able to compete in the competition.

I do recommend that you check out the Savage Soccer site...we had alot of fun yesterday at WPI and the game was absolutely amazing. I think FIRST could learn a few things from these guys!

-Andy Grady
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Unread 12-04-2005, 06:07 PM
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Re: pic: it's a Vex Holonomic Drive!

Quote:
Originally Posted by sanddrag
Am I correct in saying it is NOT super easy to push around because the wheels are not all pointing in the same direction? BTW, have any videos of it driving?
It is somewhat easy to push around, as one of the Vex Squarebots from our team was able to push it pretty easily across the linoneum floor. It has a lot more traction on carpeted floor, and it becomes harder to push. Also, the weight really helps get it more traction. When it was only the basic chassis, the wheels would slip on smooth flooring, and it would not get good traction. But this was solved once I built all the manipulators onto the chassis.

EDIT: The robot uses seven motors - four for the drive, and three for the manipulators.

I should a video of it driving around some time soon, as I have been non-stop busy for like the past month. But, if anyone was every wondering how a holonomic drive robot would perform in snow, today's your lucky day!





I took these pictures this morning when a few snow showers brought us another 1 1/2 of snow. It works okay on the sidewalk, but it was sliding all over the place. I was able to tape a little kiddie snow shovel on the front, and I was able to try to shovel some snow. This makes me want to build one of these out of Vex parts next, so I can shovel my driveway from the park bench on my front porch.
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Last edited by artdutra04 : 12-04-2005 at 06:18 PM.
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Unread 12-04-2005, 07:00 PM
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Re: pic: it's a Vex Holonomic Drive!

That just looks like a very bad idea. Especially the wires dangling on the ground. Great fun though, until the magic smoke is released.
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Unread 12-04-2005, 07:17 PM
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Re: pic: it's a Vex Holonomic Drive!

Oh, the magic smoke will just make make it seem a bit more like Christmas.
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Unread 12-04-2005, 08:11 PM
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Re: pic: it's a Vex Holonomic Drive!

Quote:
Originally Posted by artdutra04
This makes me want to build one of these out of Vex parts next, so I can shovel my driveway from the park bench on my front porch.
Why not just retrofit a powered snowblower to drive autonomously?
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Unread 12-04-2005, 08:40 PM
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Re: pic: it's a Vex Holonomic Drive!

Quote:
Originally Posted by Tom Bottiglieri
Why not just retrofit a powered snowblower to drive autonomously?
it might just be me, but i would be scared of an autonomous snowblower. just brings thoughts of it getting messed up and making one of the smaller neighborhood children into "ground beef".
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Unread 12-04-2005, 08:49 PM
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Re: pic: it's a Vex Holonomic Drive!

Quote:
Originally Posted by CmptrGk
"ground beef".
ground meat. unless you somehow hit a cow it wont be beef would it?

ew.

but how about a remote controlled one? maybe not autonomous..
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Unread 12-19-2005, 07:05 PM
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Re: pic: it's a Vex Holonomic Drive!

Quote:
Originally Posted by artdutra04
I should a video of it driving around some time soon, as I have been non-stop busy for like the past month.
Finally! I had a few free hours free after school today (what a novel idea ), so I decided to assemble the video of my Vex Holonomic Drive robot. All of the video was shot this past weekend at the Savage Soccer Demonstration at the WPI Robotnautica FLL Tournament. Many thanks to WPI for hosting the Savage Soccer competition, which presented a perfect excuse for me to build a holonomic drive. Here's the link:

17.9 Mb - Windows Media Video - http://www.team228.org/index/multime...omic-drive.wmv

Now onward, to another new Vex robot!
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Last edited by artdutra04 : 12-20-2005 at 04:31 PM.
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Unread 12-19-2005, 09:30 PM
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Re: pic: it's a Vex Holonomic Drive!

Art, better get working on another white paper for this one.
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