Re: Shooting issues
 

I would highly recommend mounting it so that those bolts aren't there right at the exit. There's almost no way that isn't causing a problem. Try bolting through the side walls above the area discs travel through, or the top surface.

Another issue could be that your wheels aren't lining up well with the flat edge of the disc, so they aren't getting a good contact. If you can get the center of the wheel tread to touch the disc on the flat edge, you should get good results.

Also, I'm assuming you've fiddled with compression and motor speed, but if you haven't, that's step 1.

Re: Shooting issues
 

Ok we will do that thanxxx though

Re: Shooting issues
 

You can use gears if you have to, they just have to be the same size.

Re: Shooting issues
 

Our team is getting some awesome shooting distance with just one motor, our shooter design in some way looks like yours. We had some issues regarding the shooting distances so we decided to use the CIM motor without any gears. And we also lifted the tire a little so that contact with the frisbee is made from under the tire (if you want to do this make sure it makes a decent compression). Another way to improve accuracy and shooting distance is eliminating vibration, we are still trying to figure out how to do that, we have already eliminate it to some extent and it has resulted in more accuracy, but we still have some vibration to get rid of.

This is a small (very small) video of our shooter.

Hope the advice helps you.

Re: Shooting issues
 

If you find the direct drive parts or out of stock at AndyMark, I bought a couple of extra ones and can FedEx them to you. Let me know. Email at dchartley@seattleschools.org.

The sheet metal you are using looks like it may flex a lot. Might try to stiffen up the lower contact surface to that it does not flex while shooting.

Doug

Re: Shooting issues
 

Just to sum up the other advice from this thread and give a little more input, I'd say there are 5 main ways to improve the shooting:
1. Check your compression of the frisbee; too much or too little can vastly diminish the amount of momentum transferred to the disk from the CIMs.
2. Direct drive the wheels using the AndyMark 8mm hub or at least get the gearing near 1:1.
3. Make the surface inside the shooter and opposite the CIMs much rougher, so that energy is more efficiently transferred into making the disk shoot further. My team is using skateboard grip tape for this.
4. Make sure that bolt heads do NOT contact the disks as they exit the shooter.
5. Watch the CIMs as the disks shoot and make sure that the c-channel they're attached to isn't twisting. If it is, it's changing the amount of compression you're getting.

Good luck at competition!

Re: Shooting issues
 

First thing I would do is speed up the wheels. You need to find a way to make it so. Then I would check the compression, and contact.

Re: Shooting issues
 

In addition to the advice given by the people above, once you get it working well, consider making the second wheel (closest to the end of the shooter) move slightly faster than the first wheel, either with gear ratios or programming. This should allow the frisbee to start spinning and moving from the first wheel, then launch out with a great deal of speed at the second. This greatly helped our shooter both with shooting distance and vibration.

Re: Shooting issues
 

what you should try is to make the "fence" (the aluminum on the opposite side of the wheels that the frisbee rides on) closer to the wheels. We made a prototype of a very similar shooter and one thing that we noticed is that you have to compress the frisbee. In example, when you try to put the frisbee through it by hand, it should bend the frisbee. Also, add some grip tape on the aluminum opposite from the wheels, that will increase spin making the frisbee fly farther. Lastly, try adjusting the height of the wheels, to where what part of the wheel touches the frisbee (rounded, apex, etc.)
wish you the best
from team 2977

Re: Shooting issues
 

Since you guys are a rookie team, I'll give you a hint.... Mount the wheel directly on the CIM and add 'squish' on the sides to increase the friction. The greater the friction, the better they fly! We used Rough Top (blue stuff) when we were prototyping. I personally suggest you do not use rough top, as it tares up the frisbees pretty easily (field damage), but instead search AM & online for something similar that is 'squishy' :) Hope this helps your team out, and good luck!