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What wheel to use for the flywheel
Out team is trying to build a single flywheel shooter. Currently we are using a 4" colson performa wheel that is 2 inch wide. Despite Pid control and trying various compression, our shots are all over the place. Any suggestion on the wheel choice and the amount of compression that may improve our consistency will be greatly appreciated.
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Re: What wheel to use for the flywheel
Have you tried putting a second, identical wheel on the same axle? Or, how about splitting the 2" wheel into two 1" wheels? The resulting "groove" should allow a straighter track through the shooter. It's not an uncommon setup for FRC shooters.
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Re: What wheel to use for the flywheel
Thanks for the suggestion. We will try that tomorrow.
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Colson's are too hard this year. Try a soft rubber wheel for your flywheel.
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We are starting to think along those line too. I think my team build a reasonably good cage and hood for the flywheel and we have done everything we knew to tweak it. We will look at a softer wheel.
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The equalizing factor, as Clint said, may well be trying a softer wheel that allows more compression to come from the forgiving wheel rather than the balls. |
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YMMV, just some results from our tests. |
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Space and weight allowing, more massive flywheels can be more easily regulated using PID. Through conservation of momentum, a large mass flywheel will transfer less of its momentum to the fuel than a less massive flywheel for each shot. It will take longer to reach optimal shooting angular velocity, but will maintain that angular velocity much more easily. If it's possible you may look into that in addition to different wheel surfaces
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To the OP, a picture of your current setup would help us all dig into the minutia of your design and offer advice, if you so choose. |
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Two banebots blue wheels, 3-7/8", seem to have good inertia. And they grip well. Only issue is the already talked about "film" build up on the wheels after shooting a lot of fuel.
Varying the compression even an eighth of an inch had a big impact, so make sure you're not using a narrow flywheel. The holes in the fuel will ruin all your planning. |
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This is what we are using. https://www.mcmaster.com/#2497k16/=16a565k
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Didn't realize there are two type of 4"wheel with 50a durometer
I order the stealth wheel and then see people talking about the compliant wheel. Does anybody know how different they are Should I buy the compliant wheel instead |
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My team actually have been using 4" x 2" Colsons, we filed the wheel down so that it wasn't crowned anymore and we have had amazing consistency so far.
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Our team has had a 90% built robot for the past 1 1/2 weeks.
We tried many things from weight of flywheel, adjustments to speed, varying the metering feeder wheels, indexing of balls, and shooter width. We also incorporated the use of a PID using the VEXPro Versa gearbox with an integrated encoder using a 2-775 Pro setup. The biggest factor we are finding are orientation of the balls as it enters our metering wheel and then shooter. Orient them all the same way and we will hit 29 of 30 shots. Orient them another way and we will miss practically all of them. So how do we account for it? Well, thats today and tomorrow's adjustment.:rolleyes: If that doesnt work, we will live with what we have. If we slow things down a bit, we can achieve close to 80% accuracy. If we shoot as fast as possible, we can shoot 30 to 35 balls in less than 5 seconds, making 50-60% of the shots. Hopefully, with our adjustments today, we can shoot fast but achieve a much higher success rate. If we can do that, we plan to share it with all of our Hawaiian friends here. :) |
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Seriously though, I'm pretty confident we'll see effective shooters using a variety of wheel types. I am not confident that there is an "in general" superior shooter wheel when it comes to COTS parts. So many factors such as compression, feeding, and style of shooter will affect what characteristics you're looking for in your shooter wheel. |
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That said, I have a few specific questions: 1) what wheel are you using? 2) what compression are you targeting? 3) what exactly do you mean by a "metering" wheel? (I have a guess) |
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Our shot up close can change by as much as 2ft as well as varying velocity and arc path. |
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We were hitting the roof of our building quite easily at full power with blue 4 inch diameter stealth wheels. I don't know the exact number but its 25 to 30 feet of height. Couple that with extreme accuracy (hitting the center of a roof tile many times consecutively) and I'd say stealth wheels are a-ok for shooting. |
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All that said, I've had great experiences shooting with compliant wheels, I think they're great for this game piece. |
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Our one wheel shooter prototype was an 8 inch wheel powered direct drive with a cim and we had plenty of distance and had some accuracy issues.
Our 4 wheel shooter prototype was 4 - 4 inch compliant wheels on 2 shafts powered by 2 mini cims. First prototype testing we hit the same 2" pipe along our ceiling for 10 shots in a row with plenty of power to spare. The pipe is about 12 feet straight up. We did no further tests. |
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