Frisbee shooter

[xForceDee]

I have not seen many teams have much success with those wheels as shooting wheels. If you click on the link in my signature you can see how well they worked for us (not saying they can't but there certainly are better options). I would recommend these pneumatic wheels but it looks like you have a different concept in mind. So instead, I suggest using these wheels and play around with different compression and opposite wall surfaces (the goal as Ether pointed out is to get the disk to rotate).

[z_beeblebrox]

If you can get the packaging to work, CIMs direct-driving the 8" pneumatic wheels in a linear or circular shooter with some compression work great.

[orangemoore]

If the poly carbonate you are using for the shooter is flexible it may be wasting all of the compression you have tried to make.

[TOPHER097]

My team used a linear design, but the properties are the same for both linear and circular designs. The key is to have as much grip/friction on the wheel and the other plate the frisbee is riding on. With these two points of contact, the frisbee will get a good spin=longer distance and higher rise. Another main thing that you will want to focus on is the compression. The compression determines the friction between the two points of contact on the frisbee. My team never got our compression perfect, but after some trial and error, you will get it right. One last key is to have the frisbee travel through the shooter will little to no friction, this is to keep the spin and speed constant throughout the shot for an accurate ending location (use a material like delrin).

[rhp3794]

our offseason is this saturday, maybe we could ask for pneumatic wheels to a team close to us.
we are going to try changing the fence from acrylic to wood

[Qbot2640]

We had marginal success with a radiused shooter using similar speeds in the spring, but decided to attempt to recreate team 67's incredible shooter as an offseason development exercise for our new builders. The results were incredible. While it is obviously not the only way to do the job...it works.

Whatever you end up with - don't overlook compression of the discs...that was the biggest factor affecting the performance of our radiused shooter - but it was very difficult to adjust the compression in that configuration...in a linear shooter it's just a matter of moving the fence.

https://vimeo.com/75662715

[jspatz1]

Team 1986 shooter: 2 stage
1st stage - CIM direct drive, 2008 KOP wheel (6" w/ solid rubber tread), 50 degree arc of contact against bare solid wooden fence, 1/8" of compression.
2nd Stage - Mini-CIM direct drive, 2008 KOP wheel, straight path against bare aluminum fence, 1/8" of compression. Approx. 6" of close 3-sided guiding after the final wheel.

[Peyton Yeung]

In our first iteration of our shooter we had a bare polycarbonate side wall supported by aluminum. Our initial results were less than satisfactory (only a few meters). We added a tacky material to the side wall and the results were astounding. We were shooting a few meters before and with the added sidewall material we could shoot full court.

[Chris is me]

As a counterargument, our two wheeled linear shooter had plenty of shot consistency with a smooth polycarbonate wall on the opposite side. Our shooter was far from an optimized solution, but if you're trying to build a simple cycler, you don't need a perfectly optimized solution. You just need a consistent and effective solution.

Here's our shooter specs, if it helps you:
- Two Banebots 4 7/8" wheels plugged into two mini cims or a cim + mini-cim (honestly doesn't matter) using the AndyMark 8mm to hex adapters
- 10.5" between the tips of the wheels and the opposite wall of the shooter (so .5" disc compression)
- Polycarbonate on the opposite side of the shooter. I've heard from MANY teams that wedgetop tread or other grippy material works well, so consider that an option too, but you might not need it.
- Plastic strips above and / or below the shooter barrel such that frisbees sliding through are physically constrained in the shooter. Basically what this does is it forces the frisbee to contact both wheels rather than lifting up between the wheels and not getting full contact. This dramatically improves vertical consistency.

We used an aimable shooter so I can't tell you if this consistently fires the exact same height over 1,000 shots, but if everything was working all 4 discs would hit almost the exact same place every cycle. This definitely isn't the best way to build a shooter, but "done" is better than "perfect".

[Ether]

Originally Posted by Chris is me

As a counterargument, our two wheeled linear shooter had plenty of shot consistency with a smooth polycarbonate wall on the opposite side.
...
- 10.5" between the tips of the wheels and the opposite wall of the shooter (so .5" disc compression)

Perhaps your larger-than-normal compression mitigated to some extent the sliding due to the polycarb fence.

[Chris is me]

Originally Posted by Ether

Perhaps your larger-than-normal compression mitigated to some extent the sliding due to the polycarb fence.

That's possible, certainly. I was under the impression that .5 inch compression is standard for linear shooters. 1/4-1/2 turn shooters use less.

Looking at markings left on the frisbee by the wheel, the length corresponds to the contact patch of the frisbee on the wheel if it was being "rolled" through the shooter. A slippery system would have a shorter contact patch as pressure would be applied to the same spot for longer.

[BrendanB]

Originally Posted by Chris is me

That's possible, certainly. I was under the impression that .5 inch compression is standard for linear shooters. 1/4-1/2 turn shooters use less.

Looking at markings left on the frisbee by the wheel, the length corresponds to the contact patch of the frisbee on the wheel if it was being "rolled" through the shooter. A slippery system would have a shorter contact patch as pressure would be applied to the same spot for longer.

Our linear shooter also had .5in of compression. Three 1:1 Bag motors with 2 7/8in banebots wheels and wedgetop tread on the opposite side.

[tr6scott]

We evaluated multiple designs early, and ended up with a single wheel, 8" pneumatic, lineral shooter design. Our strategy was to shoot from back of pyramid, unblockable to the 3 point. We were a tall bot, and when we were too tall to be agile, we morphed into a full court shooter. We never had a reason to redesign the shooter to shoot 2's, shooting 3's we needed a little more power to get our accuracy above 80% shooting 3's.

We had very accurate and active speed control on the wheel, are you missing that?

http://www.mcbride4.org/?attachment_id=82

https://www.facebook.com/photo.php?v...type=3&theater

[rhp3794]

Finally we shoot as we wanted, we use the mini CIM and the CIM, and the wheels 6" diameter. we change the wall with wood.
We try to power the wheels at different speeds, the first motor (mini CIM) has a regulate speed and then the CIM the maximum speed.
We almost reach 110" hight at 6 mts distance.

[z_beeblebrox]

How are you going to feed the shooter?

(Hawaiian Kidsth post!)