pic: VexLABS Teaser Picture



What is it we've built now?

Swerve drive?

It doesn’t look like it would be a swerve drive - it appears that there is a frame rail going to the back on the rear side of the drive assembly.

JVN - can we see a pic from the other side? Or would that give it away? :slight_smile:

Sean

the best vex robot money can buy, or i go with the Swerve drive.

Crab drive!!

OOOhhhh! OOOOOhhhhhhH!!! OOOHHHH!!! Mr. Kotter! Mr. Kotter! I know! I know!!! :smiley:

('cause I saw it last weekend)

Im curious what the wheel is but im more curious about whats behind it. Its at the right corner just behind the wheel.

i know i know jumps up and down
It’s a robot!

actually, i’m pretty confident its swerve (crab) drive. But also a transmission is a possiblity, maybe something like that.

Wait, I’ve got it. JVN has figured out how to mate the DeWalt XRP transmissions to a Vex setup. NBD just reached the next level. :smiley:

Horshak is right. A bunch of us saw it, and driving it is pretty cool too as long as you stay under the speed limit :rolleyes:

I’m guessing…crab drive

You guys make me want to get the DVD…

Wetzel

Well folks, this is a teaser no more… Enjoy :cool:
(These were all obtained on the vexlabs.com website)
http://www.vexlabs.com/images/vex-robots/swerve-bot-700.gif

http://www.vexlabs.com/images/vex-robots/swerve-bot-a-700.gif

http://www.vexlabs.com/images/vex-robots/swerve-bot-b-700.gif

But wait, it gets even better! :smiley: See it in action!
swerve-slalom.wmv - 1.2 Mb
swerve-spin.wmv - 1.5 Mb

P.S. I also found some stuff about a “Tumbler” robot - See the following links for pics and video:
http://www.vexlabs.com/images/vex-robots/tumbler-bot-700.gif
http://www.vexlabs.com/images/vex-robots/tumbler-bot-a-700.gif
http://www.vexlabs.com/images/vex-robots/tumbler-bot-side-700.gif
tumbler-box.wmv - 0.7 Mb
tumbler-climb.wmv - 1.3 Mb

Very cool. Thanks for the links. But I don’t entirely get it. Are the grey wheels just super low traction or something so they can slide easily? Why not omniwheels? Maybe these grey ones give a smoother ride?

I spoke with John, it seems like the project goal was to make a swerve drive using 1 kit. They did add another servo to the kit but it works very nicely. Thats the reason they didn’t use omni wheels. If you take the green tire off of the wheels, you will get that grey part. Its really smooth and slippery. They were made that way on purpose. :slight_smile:

Thanks. Without actualy owning one, it is hard to know. It is good to have piece of information - knowing that you have selectable tread/traction.

I wonder if a 4 wheeled omni type robot could be made with only the slippery grey wheels. Would they have enough slip to allow holonomic movement?

No.
Omni-wheels only work in a holonomic application if they have rolling traction, but not lateral traction.
These wheels have no traction in either direction.

what are the ports for the servos, and motors?

what are the controls that are used on this robot?

For more information, and discussion… please see:

http://www.chiefdelphi.com/forums/showthread.php?p=401125#post401125