View Full Version : pic: FRC 2869 - 2016 Shooter
Sperkowsky
26-01-2016, 14:59
[cdm-description=photo]42679[/cdm-description]
hardcopi
26-01-2016, 15:00
Looks good, nice and clean... those wheels though... they look like they might rip the ball up.
BryceKarlins
26-01-2016, 15:00
Are the Flywheels actually mounted that high? We've found that mounting them in the exact center works best.
BryceKarlins
26-01-2016, 15:02
Looks good, nice and clean... those wheels though... they look like they might rip the ball up.
If you sand down the edges of the wheel, they work great. Just spin them up on the shooter, and hold a piece of sandpaper up to them.
Looks like a nice simple way to score. Easy to build. Doesn't take up too much space. Looks easy enough to tweek and make a consistent shot out of it.
Nice job
Ginger Power
26-01-2016, 15:06
Looks awesome guys! Great work!
notmattlythgoe
26-01-2016, 15:06
Are the Flywheels actually mounted that high? We've found that mounting them in the exact center works best.
Just a heads up. Those aren't fly wheels.
fly·wheel
noun
a heavy revolving wheel in a machine that is used to increase the machine's momentum and thereby provide greater stability or a reserve of available power during interruptions in the delivery of power to the machine.
jkelleyrtp
26-01-2016, 15:48
Just a heads up. Those aren't fly wheels.
Just so I understand, the "flywheel" part of a shooter would be the extra weight added and not the actual firing wheels themselves? While these wheels are not flywheels, is it safe to say that heavy shooting wheels are technically flywheels in their own right?
notmattlythgoe
26-01-2016, 15:56
Just so I understand, the "flywheel" part of a shooter would be the extra weight added and not the actual firing wheels themselves? While these wheels are not flywheels, is it safe to say that heavy shooting wheels are technically flywheels in their own right?
Yeah, I guess a heavy shooter wheel would be a flywheel in itself.
Sperkowsky
26-01-2016, 18:52
Are the Flywheels actually mounted that high? We've found that mounting them in the exact center works best.
We updated it and put a small spacer. Making it slightly lower on the ball.
Orion.DeYoe
27-01-2016, 17:52
Just a heads up. Those aren't fly wheels.
Can you please provide me with a threshold for when a spinning object is considered "heavy"?
AdamHeard
27-01-2016, 22:17
Can you please provide me with a threshold for when a spinning object is considered "heavy"?
When it's a flywheel.
A flywheel does not have to be heavy, to be able to store energy/momentum. The speed of rotation is also important as well.
Just look at Formula 1 Racing Flywheel System. They use 240 mm diameter flywheel which weighs 5 kg and spins at around 64,500 rpm. They can store enough energy to give a power boost of 60 kW for 6.67 seconds.
a heavy revolving wheel in a machine that is used to increase the machine's momentum and thereby provide greater stability or a reserve of available power during interruptions in the delivery of power to the machine.
I can see both sides of this argument. In general when I think of a flywheel I think of something that stores energy and/or dampens. Personally I would not consider a shooter wheel a flywheel but I have no problem with those who choose to do so.
At least it's not a piston :)
Orion.DeYoe
28-01-2016, 08:56
Yeah, I was attempting to indirectly point out that you can't say a wheel is, or isn't, a flywheel based on its weight. Because whether or not it's "heavy" just depends on how much energy you need to store.
I just wanted to emphasize the fact that the OP's terminology was correct and that these are considered flywheels in this application.
notmattlythgoe
28-01-2016, 08:59
Yeah, I was attempting to indirectly point out that you can't say a wheel is, or isn't, a flywheel based on its weight. Because whether or not it's "heavy" just depends on how much energy you need to store.
I just wanted to emphasize the fact that the OP's terminology was correct and that these are considered flywheels in this application.
But they're not, these wheels are not storing energy (or at least enough energy to make any difference) which is the exact point of a flywheel.
That's a flywheel!
http://i18.photobucket.com/albums/b109/scott4020/crisman_wired_uk_dean_kamen_011-590x393_zpsfx8gsmg6.jpg
Chris is me
28-01-2016, 09:32
But they're not, these wheels are not storing energy (or at least enough energy to make any difference) which is the exact point of a flywheel.
Yes they are. They're storing kinetic energy. If the wheel needs to be spun up before the ball contacts it for it to work as intended, then the wheel is a flywheel. Whether or not it is a particularly good flywheel isn't relevant. Spinning wheel shooters in FRC work by storing kinetic energy, which is exactly what a flywheel is.
Electronica1
28-01-2016, 09:34
But they're not, these wheels are not storing energy (or at least enough energy to make any difference) which is the exact point of a flywheel.
It is still a flywheel, just not a particularly good one.
Sperkowsky
28-01-2016, 09:50
It's definitely a fly wheel but not in the traditional sense. We spin the wheels up for a couple of seconds to gain energy before the ball is pushed into the wheel therefore it is a fly wheel.
mustangs2647
28-01-2016, 10:31
looks nice but what whats your method of loading it?
Monochron
28-01-2016, 11:13
Yeah, I guess a heavy shooter wheel would be a flywheel in itself.
You guys might need some sleep. I can't see those wheels producing a useful amount of lift at all.
swaxman12345
28-01-2016, 11:27
Looks good, nice and clean... those wheels though... they look like they might rip the ball up.
They do.
notmattlythgoe
28-01-2016, 11:54
You guys might need some sleep. I can't see those wheels producing a useful amount of lift at all.
https://c2.staticflickr.com/4/3057/2367515373_515ff7a325.jpg
Sperkowsky
28-01-2016, 17:45
looks nice but what whats your method of loading it?
It's just a matter of reversing the motors and pitching it down.
Ginger Power
28-01-2016, 17:55
They do.
Do you have pictures or anything to support this? I'd be interested in seeing what kind of damage of they caused, and what the application was that caused it.
Sperkowsky
28-01-2016, 18:22
Do you have pictures or anything to support this? I'd be interested in seeing what kind of damage of they caused, and what the application was that caused it.
+1
Ben Wolsieffer
28-01-2016, 19:23
We did some prototyping with those wheels, and while they did scuff the ball, they didn't cause any major damage to our ball. It likely depends on the amount of compression you have.
Ginger Power
28-01-2016, 20:00
We did some prototyping with those wheels, and while they did scuff the ball, they didn't cause any major damage to our ball. It likely depends on the amount of compression you have.
We had the same result in the process of testing, but we got it to a point where there was no sign that it was fired.
What motors are you using there in the image?
What motors are you using there in the image?
The motors in the image are 775pro's they are a new motor available this year and are available from VEX or West Coast Products.
http://www.vexrobotics.com/vexpro/motors-electronics/217-4347.html
http://www.wcproducts.net/motors
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