Ball posession: Roller (ball magnet) or vacuum?

[Ether]

Originally Posted by Tom Line

if it spun it would back drive and the ball would simply squirt out when you tried to back up.

Hi Tom,

That is simply not true. With a free-spinning lower roller, the design approach is different: If you design it right, the ball is continuously rotating when being possessed. The backward rotation of the ball makes the ball follow the robot when the robot backs up.

In fact, there was a bot with a very effective ball magnet at GVSU that used a free-spinning lower roller bar and a motorized upper roller.

See this post: http://www.chiefdelphi.com/forums/sh...6&postcount=51


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