On 2015-04-19, Ignoramus4444 wrote:
Video and some details are here.

http://www.machinerymoverschicago.com/blog/Robocross/

Most people go the easy route and buy a "Vex Robotics" kit. We built
our own and won.

This robot works like a skid steer. The bucket, I made sharp as a
knife and sharpened it to make it a straight and sharp blade, on a
surface grinder.

Sorry, the purpose of a very sharp bucket edge is to pick up pennies
and Lego bricks, that are hard to pick up otherwise.