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#31
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Re: Ball Magnets
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#32
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Re: Ball Magnets
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#33
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Re: Ball Magnets
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Also in this game you can be a strong defender or a striker with a robot that just moves well. 2265 proved to me at NYC that any team can come out and play absolute shut down defense if they have a proper drivetrain and good driving. 34 is nothing but a mecanum driving bot and they were one of the best scorers in the early regionals. Getting back to the point of this thread, I would personally make the roller run by a motor, because an idling roller really defeats the purpose since you guys don't have trouble pushing the ball. I would slap it on the bot and see how it works during practice matches. If anything you could always go back to the way things were. There isn't that much risk in this situation and the reward could be great. You guys are one of the best scoring machines out there but if you have a roller that doesn't take away from your other success you could become that much more difficult to defend and ultimately defeat. |
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#34
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Re: Ball Magnets
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I was under the impression ball magnet was a blanket term for any ball-control device. |
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#35
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Re: Ball Magnets
Hi BJC....Yes we found that robocup ball dribbler video early on in the design process. Our first prototype worked well enough to keep our interest and our refined ball magnet is even better than even the one in the video. Here's another video http://www.rambotics.com/video7.html that shows our driver practicing with our practice robot and improved dribbler.. We thought ball control was more important than a kicker to practice with so we didn't even put a kicker on our practice bot.
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#36
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Re: Ball Magnets
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A couple of other notes. To get variable shot selection we reverse the direction of the roller just before the kick to push the ball out in front a bit. By varying the lead time, we can get a good shot from all three zones even though the kicking force is the same all the time. Also, when driving forward with the ball magnet pulling the ball into the robot, our robot would start to "power hop". We reverse the roller with speed propotionate the forward speed to avoid this. |
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#37
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Re: Ball Magnets
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148 has a ball magnet. 217 has a ball magnet. 1114 has a ball magnet. These types of things are often imitated, but never duplicated. |
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#38
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Re: Ball Magnets
What would you consider something like what 1726 has where the ball spins in front of the bot instead of inside it. They still hold onto the ball when they back up its just different. It would be ironic if that had another name since 1726 coined the term ball magnet I believe.
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#39
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Re: Ball Magnets
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My team's been using the name, as every possession mechanism we've made is an iteration of that original design. I guess we'll stick to "the vacuum" now, though. Last edited by Chris is me : 21-03-2010 at 15:48. |
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#40
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Re: Ball Magnets
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#41
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Re: Ball Magnets
I believe that magnets do drop things, some more than others, but magnets do drop things. A ball magnet is really any mechanism designed to posses balls. I understand not counting adhesives as ball magnets, but vacuums, rollers, and pincher bars all fall into the category of 'ball magnets'.
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#42
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Re: Ball Magnets
"ball magnet" is just a silly name I came up with for this video
http://www.youtube.com/watch?v=KRqj0Mgbq10 good to see it continues to stir up so much controversy And kudos to those teams who made one that works well.... |
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#43
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Re: Ball Magnets
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I too was under the impression that a ball magnet was a general word for something that possessed a ball, and wasn't aware that there is a design aspect to the word. |
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#44
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Re: Ball Magnets
Unless said magnets are part of a magnetized screwdriver and you are trying to place a screw in a very awkward place.
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#45
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Re: Ball Magnets
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Anyway, I would suggest if you don't want to do anything else line the front of the robot with memory foam (the stuff in the goal). That in itself will help alot . Although, if you are going for more of a BALL MAGNET (I think i used it right) then it will take testing and probably some practice rounds.Just remember, if you go with a single rollor get it as high on the ball as possible. If you are going for a pincher use a smaller diameter roller and be careful the bottom roller clears the bump (many teams who use this designed for it since the beginning). Also remember that a vacuum takes the most weight. Finally, all of these take time to impliment so you need to be sure your prepared to possibly use all your practice time to get it to work; they can be tempramental. Although, like stated earlier you don't really have anything to lose, so I would go for it. Good Luck ![]() |
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