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#1
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pic: 2949 PWNAGE: 2012 Robot
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#2
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Re: pic: 2949 PWNAGE: 2012 Robot
Wow!
That looks really well designed! The quality of your CAD is phenomenal. What was the motivation behind using belts instead of wheels to shoot the balls? My old team tried something similar for reasons that IMO did not make sense. The end result was a horribly inefficient system that (despite using two CIMs) could only fire a miserable 15'. It looks like your system is far better designed and probably vastly more efficient but still, 4 motors for the shooter is a lot. |
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#3
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Re: pic: 2949 PWNAGE: 2012 Robot
Quote:
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#4
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Re: pic: 2949 PWNAGE: 2012 Robot
Quote:
I've seen plenty of wheeled shooters with incredible accuracy. |
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#5
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Re: pic: 2949 PWNAGE: 2012 Robot
Really great robot! Thanks for helping us at GKC in quarterfinals!
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#6
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Re: pic: 2949 PWNAGE: 2012 Robot
We went with the belt shooter for a couple of reasons. First, because the belts have a shooting length of 14in, it gives the ball more contact time to be able to build up to the full speed that the belts are running at. We found that with the wheel shooters, you tend to have less contact time with the wheel, which means you had to compress the ball more to be able to shoot it far enough. After doing some prototyping, we found that compressing the ball too much made the ball deform a lot in mid-air, and we wanted to avoid this. So because the ball can get to the full velocity of the RPM of the belts, we don't have to compress the ball nearly as much. Also, we are able to more precisely change the amount of backspin we put on the ball. Each side has an encoder on it, so we can adjust the distance the balls travel using a PID controller.
With everything in FIRST though, there are many different effective ways to score the balls in this years game. Personally for us this was the best and most accurate way that we found. Hope that explained it well. Quote:
-Nick |
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