229 Drive Train

[Greg Ross]

Originally Posted by ajlapp

John sent me a message letting me know they were working on an omage to our original kiwi robot.........

homage

[dlavery]

Originally Posted by Max Lobovsky

Guys, there are other teams that have since, and will, use omniwheel holonomic drives. And I mean in competition. The 4 CIMs are definitley inviting.

Yup, they sure are... Hmmm....

[henryBsick]

I am downloading the video as I write this (dumb 56 k)
I have heard of the kiwi's and saw a couple lego models...pretty shweet. I can't wait to watch the vid.
The holonomic is also very shweet as you mentioned max. Uuhh I think 1083 had one last year... wicked ball gatherer.

But the real question is.. Where the mecanum at?!?
^kinda off topic (heh sorry... I couldnt resist asking)

[Andy Baker]

Love the video, love the song. This is a great looking robot with smoooth motion. Kudos to 229.

(btw.. thanks for the plug at the end)

Andy B.

[Greg Perkins]

just because im a geek, is it coincedence that the file size is 22.9mb? lol....

[pakrat]

I love it!! That is a cool Drive Train. Good work to 229 and 857. wow.

[Jeff Waegelin]

Originally Posted by Greg Perkins

just because im a geek, is it coincedence that the file size is 22.9mb? lol....

Oh no, 229 is appearing everywhere again

[Matt Fultz]

229, thats incredible. I know it isn't the game drive, but itd be fun to see it in action on the field!
Looks great!

[activemx]

Originally Posted by Matt Fultz

229, thats incredible. I know it isn't the game drive, but itd be fun to see it in action on the field!
Looks great!

Man i wish i was i could goto nationals this year awesome robot

[JVN]

We greatly appreciate the compliments, however we're just (as usual) standing on the shoulder of a giant.

857 and the boys at MI Tech were the ones who showed us how to do it, AndyMark provided the omni-wheels, and we just took it from there.

Personally -- I can't wait to see what other cool omnis we see this season.
It is a good year for them.

John

[Projectchon]

this is so cool , but i don't get how it works

[Eric O]

Originally Posted by Projectchon

this is so cool , but i don't get how it works

William,

The wheels are all set 120 degrees apart and are special Omni or Trick Wheels. This allows for the component forces of the wheel to power the robot in the desired direction. The most basic example of this is the robot going straight forward. To do this 2 of the wheels are powered the same amount and the third trails behind with little friction due to the rollers on the Omni wheels.
In the attached diagram (Sorry for the paint usage, it was the quickest way) you can see that 2 black arrows are the forces from the wheels. The red vector (arrow) is the force applied backwards from the wheel and the blue one is the perpendicular force. If you add up the forces in both directions (vertically and horizontally) the 2 blue arrows cancel each other out and therefore the robot only moves in the red direction. Powering the three wheels at various levels creates a more complex model, but allows the robot to move in any direction. I hope this helps.

-Eric

[Projectchon]

thx alot Eric, now i want to buy a few omni wheels

[Jmoo]

Originally Posted by sanddrag

If I was going to Atlanta I'd be the first customer. I'd pay $15 for a 3 minute try.

Dude, we still have the original kiwi in our shop. Works great (play with it whenever we get bored.) I'll bring it to great lakes and midwest if people will pay to drive it.

[Billfred]

Hey now, no selling things at competitions!

(Can you tell I've been reading the manual too much lately?)