pic: Xbot vs. Cheesy Poofs, Round 2.

[activemx]

Originally Posted by Travis Covington

Is that Akshay taking a picture? hahaha!

Indeed

[Rick TYler]

Who says nothing exciting happened in Portland? I'd also like to get pics of the match where four out of six robots flipped, and another of the match where 1294 and 1318 are sitting on the platform next to each other, with 1318 pretty much sitting on its rear with its front propped up on the Lexan. You could almost see flames and smoke at the end of both of these matches...

The X-Bot (488) had a slick chassis this year. I want to know where Madison found those tiny omniwheels.

[Madison]

Originally Posted by Rick TYler

The X-Bot (488) had a slick chassis this year. I want to know where Madison found those tiny omniwheels.

The wheels are a sandwich of aluminum and delrin plastic that I designed, while the rollers are 1.25" diameter EPDM rubber available for $.25 ea. from AndyMark. They roll on 1/8" diameter steel pins.

We cut the aluminum "bread" on a Haas 3-axis CNC mill and the delrin "meat" on our carbon-dioxide laser cutter.

There was no fantastic reason for us to build our own wheels aside from deciding to use an odd diameter for the wheels -- 5.75". I prefer to take the tread on the Skyway wheels down to a flat, 'slick' profile and, as a result, they're smaller than the nominal 6" original diameter.

Also, Akshay -- can you upload the pictures you took?

[Rick TYler]

Originally Posted by M. Krass

The wheels are a sandwich of aluminum and delrin plastic that I designed, while the rollers are 1.25" diameter EPDM rubber available for $.25 ea. from AndyMark. They roll on 1/8" diameter steel pins.

We cut the aluminum "bread" on a Haas 3-axis CNC mill and the delrin "meat" on our carbon-dioxide laser cutter.

So, what do you sell them for? Can I trade some 8-inch Skyways for a set?

[Madison]

There's probably a handful of sticky ethical and legal issues surrounding the potential sale of things I make on the Microsoft campus.

In any case, the delrin hub is really an absurd design choice. The rods for each of the EPDM rollers are only 1/8" diameter pins as I mentioned and milling a slot for those on the milling machine just makes me nervous. It's not impossible, I know, but I can only guess how many endmills I'd break while trying to do it. By using delrin, we're able to use a reasonably strong alternative to aluminum, but to do so much more quickly and easily by using the laser cutter. The downside is that delrin is far more expensive. So, even if it's more prone to breaking, we can replace the delrin parts in a heartbeat. It's not a bad compromise, I guess.

[activemx]

The pictures are up, check them out here
http://www.flickr.com/photos/amx/set...7594076466467/

[!c3b0><]

Originally Posted by M. Krass

I mentioned and milling a slot for those on the milling machine just makes me nervous. It's not impossible, I know, but I can only guess how many endmills I'd break while trying to do it.

if you use the right feed rate and a lot of cutting fluid
it also helps to make more then one pass and if you uses double sided sticky tape to tape the aluminum sheet to some ply wood it would get ride of the bowing

[Kris Verdeyen]

That was an amazing match to watch.

[tyguy2021]

I remember that match, I'm the driver for team 1839.I was so ticked when we tipped. Thanks for the video. We were filming also, but our cameraman got too excited and pulled the camera away for a second and when he paned back we were tipped.