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View Poll Results: How does your robot posess the ball?
Roller (Ball magnet) 123 65.78%
Vacuum 35 18.72%
Armature 0 0%
We do not intend to posess the ball 11 5.88%
We did not ship a posession device, and will decide before competition 18 9.63%
Voters: 187. You may not vote on this poll

 
 
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Unread 28-03-2010, 17:43
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Ether Ether is offline
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Re: Ball posession: Roller (ball magnet) or vacuum?

Quote:
Originally Posted by MarkoRamius1086 View Post
I believe that it is roughly parallel. Perhaps the bottom one is a smidgeon behind the top one... as its primary purpose is to kep the ball from going back. We have it so the ball goes all 3 inches worth into the frame, so the top bar has the most grip possible.
I was in the stands at GVSU and noticed a bot with a particularly effective ball magnet. After the match, I walked down to their pit area and talked to them. They had a 2-roller design. The upper roller was powered and the lower was free-wheeling. The lower was set back from the upper about 1 to 2 inches.

As the team explained it to me, the top roller pulls the ball in, squeezing it ever so slightly as it does so, and the lower roller stops it at 3" inside the frame perimeter. Very effective.

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