Thread: Flywheels and Shooter Wheels
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Unread 17-03-2012, 02:22
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Hawiian Cadder Hawiian Cadder is offline
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AKA: Isaak
FRC #0159 (Alpine Robotics)
Team Role: CAD
  
Join Date: Feb 2010
Rookie Year: 2003
Location: Fort Colins Colorado
Posts: 573
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Re: Flywheels and Shooter Wheels
We decided early on that a flywheel would not be necessary to shoot the short range shots that we decided to work on. A pair of fisher prices driving the first stage of a FP gearbox going via chain to our shooting wheel, overall reduction is between 1:6 and 1:9 (still experimenting to find the sweet spot for consistent fender shots). It spins to top speed in less than 2 seconds. We chose this non flywheel setup for several reasons:

1) short range shots were what we decided to peruse
2) the shooter needs little to no time to spin up, making shooting multiples simple and easy
3)high CG is unacceptable this year, a flywheel up high would raise our CG (currently 5.5-6.5 inches off the ground)
4) our custom gearbox driving the shooter wheel was easily switchable, and if there was a problem then we would simply add more motors until there was enough power available

One pro of the flywheel design is we considered using it as a gyroscope to balance the bridge more easily, this was ruled out as too complex and heavy.