Shooting issues

[akash992391]

Ok and other thing do we have to,have tight enough both side to throw higher frisbee.

[Jorge Ayala]

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.

[dchartley]

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

[andrewthecow]

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!

[GilaMonsterAlex]

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.

[bbuncher12]

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.

[runneals]

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!