29-06-2016, 17:19
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no bag, vex only, final destination
AKA: Pinecone
 FRC #0228 (GUS Robotics); FRC #2170 (Titanium Tomahawks) Team Role: Mentor
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Join Date: Dec 2008
Rookie Year: 2006
Location: Glastonbury, CT
Posts: 7,657
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Re: Modeling Ball Shooters
Quote:
Originally Posted by Basel A
There are a couple approaches that can be taken here. The method mentioned by Thaddeus above (Energy = Force x Distance) has a severe flaw in that it assumes the motor will only rotate the arc of the wheel path. However, because of the speed difference between the wheel and the ball, the wheel is absolutely going to slip, possibly for many revolutions, before it has matched speeds with the ball. One way to account for that is to determine the force during slip and measure the revolutions it takes for the wheel to stop slipping on the ball.
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I think you might be surprised how limited slip can be with the right shooter wheel. Zero slip isn't accurate but it might actually be close enough to be a workable assumption here. I really need to post some of my shooter's high speed videos when I can.
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