pic: Whoops! Too much torque

[sithmonkey13]

1178 had something kind of like this happen at an off-season event (any Venturing Scouts might know about the Fall Fun Rally held in St. Louis, Boeing always asks us to come out to their events and show off a competition bot). After several hours of driving on asphalt, a scout drove the robot off the road, where one wheel got stuck. The scout proceeded to show the joystick all the way forward, and bent the sprocket and sheared off all the bolst holding the sprocket to the wheel. Needless to say, we were done driving that day.

[seannoseworthy]

Originally Posted by Alan Anderson

The distorted shape of the wheel doesn't look like what I'd expect from either a rotational or side load. It looks like a simple impact to me. The robot might have taken a hard bounce, or it might have run the wheel into a proverbial brick wall at high speed.

Then again, the wheels were redesigned to handle greater side loads without breaking the spokes, and this might just be how they react now.

Thats exactly what happened a simple impact, this happened on our 2009 robot. We had 6 similar wheels like this one on the robot. This was caused by going forward then reversing fairly quickly. The front four wheels then came off the ground then quickly back down crushing this wheel.

[Alan Anderson]

Aha! So the subject line is correct. Too much torque on the other wheels caused this one to break, because the robot did a wheelie.