http://www.valleytech.k12.ma.us/robo...2%20Sunday.jpg
this what it looked like and
http://www.valleytech.k12.ma.us/robo..._ball-goal.JPG
is how it worked
Yes if you wanted to build a robot that stores all the balls then dump them very quickly this could be a option for you. Two sets of rollers one to pick up and one to discharge them this machine could stores easily 40 small balls and be able to get rid of all of them within 5 seconds. with a open middle you could throw balls into it and use the ball roller for a backboard. very easy to make the shot.
this unit is very light, it is made up of light square tubing and very thin Sheet metal. so you can make a very strong base and not worry about flipping over