Re: 3 Wheel 3 CIM shooter
 

I believe the spin comes from only one side of the disc being spun. Because the force is exerted on the right side of the disc, the frisbee will curve slightly to the left. That's just my theory.

Re: 3 Wheel 3 CIM shooter
 

And I thought 2 miniCIMs for a shooter was crazy. I look forward to seeing this launch some disks!

Re: 3 Wheel 3 CIM shooter
 

Have you guys directly compared this to a 2 wheel, 2 minicim shooter? I am really curious how much more distance and repeatability you get.

Re: 3 Wheel 3 CIM shooter
 

I actually intended to describe the frisbee coming out of the shooter not level with the base. The curve is a direct result of an un-level frisbee.

I thought about it further and think it may be a function of the stored energy in the pneumatic wheel compression. The compression coupled with the wheel deforming to "cup" the frisbee gives a reaction where the frisbee comes out non-level with the launch base.

Re: 3 Wheel 3 CIM shooter
 

I recall seeing another thread a while back where a team had a similar issue and found the cause: the frisbee was slightly climbing up the wall of the guiderail -- it was not staying flat on the base. Can you take some video with a camera angle looking "down the barrel of the gun" - you might be able to see this effect.

If that's what's happening in your case, you might be able to solve it by tilting the guiderail slightly toward the frisbee, or adding a piece to keep the frisbee from climbing the guiderail.

Re: 3 Wheel 3 CIM shooter
 

Have you given much thought to incrimentally increasing the speed of each subsequent wheel?

In other words, why directly drive all three wheels? A lot of teams have shown significant success with (relatively) lower speeds on the first wheel the disc comes in contact with. Additionally, it should (theoretically) increase your throughput (and potentially overall efficiency), as the first wheel will lose less energy and thus return to effective speed quicker.

Re: 3 Wheel 3 CIM shooter
 

WOW! Very impressive you guys. That is getting some distance. Do you all plan to shoot full court?!

Re: 3 Wheel 3 CIM shooter
 

The day before we had CIM > Mini > wall and it was hitting 9 feet up at about 40 feet away, this is at least double that with the extra mini


This is doing that to an extent as the first wheel it contacts is going 5,300 RPM and the next 2 are going 6,200, We enjoy not having to worry about chain or gearboxes and seeing as we are getting more than full court shots (with amazing accuracy, hitting the same cinder block on the wall 3 times in a row from 70 feet) this is the design we are going to go with.


Thanks! It looks like that's the plan after today's tests, you will see one of them in our Vlog this week, I think they forgot what years game they were playing if you know what I mean ;)

Re: 3 Wheel 3 CIM shooter
 

You know you don't *have* to do this with gearing, right? Those motors are on speed controllers, so you can simply experiment with the speed values you send them once you have a proper control system in place. Many teams have reported great success with 2xCIM linear shooters, direct drive to the wheels, with the first one set about 60% speed.

Re: 3 Wheel 3 CIM shooter
 

Good to know. We tried mini -> mini a while back and got results that were good enough to move forward. I'll see if I can't leave space in the design for a third motor just in case we end up feeding or something.