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Lumpy, Sticky, and Wobbly Too
Posted by Dodd Stacy.
Engineer on team #95, Lebanon Robotics Team, from Lebanon High School and CRREL/CREARE.
Posted on 1/11/2000 8:36 AM MST
In Reply to: game ball inflation posted by Joe Balint on 1/10/2000 11:07 PM MST:
The balls are and will be out of round and variable in 'diameter,' however we want to define that term. The ball handling mechanisms must be tolerant of those variations. We killed ourselves in Ladder Logic by designing our manipulator for a 'perfect' spec ball. Don't repeat our mistake.
The balls will also have very different friction coefficients when you play at a chilly Regional in March and when you play at the Nationals in humid Orlando in April. They will behave very differently and may tend to get hung up inside your ball handler when sticky. Be forewarned.
Finally, I noticed at Kickoff that the balls behave like their CG is off center - not just due to their non-spherical shape, but due (I think) to large local variations in the thickness of the ball material. That stuff is dense! At least this aspect causes the balls to come to rest pretty quickly and not roam all over the field. Good luck everyone with real world balls.
Dodd
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It is easy to be righteous on Chief Delphi, and harder to implement in life. - DonRotolo [more] 
23-06-2002, 22:28
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