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Ball auger/screw
How do you move a ball horizontally (eg. ball auger/screw) within a robot? We are thinking about a wide robot to allow a bigger opening for picking up balls off the floor. When our robot "captures" the ball, we need to the position it (transition to) so that it can be elevated in a specific area of our robot (eg. a vertical lifting device using belts, tubing, etc.). The vertical lifting mechanism will then place the ball(s) in a rack that feeds a throwing device.
Would a rotating shaft(s) covered with a spiral (eg. creating a screw's thread) material work? What type of material would work for something like this?
Other suggestions welcomed.
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The most important deisgn criteria is always performance in any of the parts / systems we design. But we do try to abide by the saying -- if it doesn't look good (right), it probably isn't good (right). - Adam Freeman [more] 
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