pic: How?
 

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Well that's fun. I'm guessing something got jammed between the spokes while the motors were at full rev? That takes talent, my friends.

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how? observe the following formula:

rim = not moving + hub = moving = no more hub on wheel

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I'm calling shenanigans. :yikes:

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The spokes look too sharp for it to be a spinning motor. It looks like someone took a hammer to the hub of the wheel, perhaps to get a hub out that was stuck? That would be likely if someone threaded #10 bolts into the holes, which would make it hard to unbolt (heh, we have experience with this one:o) ... so plan B was a hammer.

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hmmm...that looks familiar...

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Oh my...

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I haven't done since 2005.
We had too much weight on the rear of the robot and if it slammed down hard after placing a tetra the skyway wheels could shatter near the hub.

It was the last year we used kit wheels or 6" wheels until this year...

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gnomes stole it

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By any chance did a robot slam into the side of your robot where this wheel was located, such as at practice while bumpers were missing?

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GAAA!! why won't they leave me alone?!:ahh:

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Because they need wheel hubs. They're building...

A 100 WHEEL DRIVE

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Hahaha, that's cool :D intresting breaks in the wheel. Was it spinning when it broke?

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We had the pictured failure happen to us at least three times during competition in 2007 with the kit wheels. If I recall correctly, we thought the problem was mostly getting pushed sideways by defending robots. We didn't have serious troubles until the off-season tournaments, when a combination of more aggressive defense and the accumulation of lots of matches took its toll. The A/M wheels were strengthened for 2008. We didn't have any failures in 2008, but the game didn't involve as much defense, either.

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469 and 330 reported the same, 469 on a crab and 330 on a 6WD drop center. The suspicion was that it was side loads. And yes, the wheels were strengthened after 2007.

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Perhaps this is a late April Fools joke.

At GTR last weekend, we made the move to switch from our 4 wheel rear wheel drive, to 4 wheel skid steer drive. The way our drivetrain is designed, it relies on the "center" wheel's central hub. We didn't have the time nor parts to make an appropriate spacer, so we just cut it apart on a bandsaw.

We have two of these.

-Nick

Re: pic: How?
 

So shenanigans it is!

It was pretty obvious the spokes were cut on a band/hack saw and not the result of the typical failures seen on prior AM/Skyway wheels. The hand covering a significant portion of the outer tread reinforced that.