Andymark Pneumatic wheel problems

[PizzaBoxZombie]

As several other teams and IR3 have shown in various youtube videos, the pneumatic wheels from andymark are pretty decent shooting wheels. after recieving ours, however, we found that ours are out of balance/round. spinning at 5-6500 rpm they shake around a lot and can not achieve full potential speed.
we have since changed wheels for some more consistent and faster, but we were wondering if anyone else had tried to use them and found the same problems? and if anyone has, have you found a solution?

[Mk.32]

We definitely have had the same issues, we haven't found a solution and moved on to other options.

[GUI]

Is the tire bead seated correctly?

[ehochstein]

Originally Posted by GUI

Is the tire bead seated correctly?

That's the problem. We can't get it to seat correctly. Any tips/tricks to do so?

[PizzaBoxZombie]

Originally Posted by GUI

Is the tire bead seated correctly?

yeah, ours were, to the best we could figure out, ill double check. thanks. the other problem was we still had to balance the valve stem.

[bEdhEd]

Originally Posted by PizzaBoxZombie

yeah, ours were, to the best we could figure out, ill double check. thanks. the other problem was we still had to balance the valve stem.

Is there a special method in order to seat the wheel?

[Tyfighter98]

I believe I was experiencing that same problem today when we were testing a prototype. The pneumatic wheels appeared to have a lot of free movement. I don't know if this is just our prototype or wether the wheel isn't seated properly.

[wilsonmw04]

I believe the problem is with your speed and not the wheels. If I remember correctly, IR3 only used a cim at ~55% power.

[Ether]

Originally Posted by wilsonmw04

If I remember correctly, IR3 only used a cim at ~55% power.

I'm trying to hunt down the source for this. Do you remember where you got it?

[ehochstein]

Originally Posted by Ether

I'm trying to hunt down the source for this. Do you remember where you got it?

We tested our pneumatic wheel at 60% speed today, launching between the wheel and our wood prototype base. We experienced approximately the same range/speed as the Robot in Three Days robot.

[Andrew Zeller]

Originally Posted by Wiifi

We tested our pneumatic wheel at 60% speed today, launching between the wheel and our wood prototype base. We experienced approximately the same range/speed as the Robot in Three Days robot.

60% of CIM free speed?

[Kyle Love]

Just to bring up a couple of other possible issues...

Are the bearings installed properly (with flanges and such extremely level and tightly in place)?

Are you using a cantilevered or secured method for the wheel?

I would guess that if you could have a bearing or some other type of "reciever" for the end of the shaft, you may take some of the wiggle out of it. I do agree with some posts above that I doubt these wheels are really meant to spin as fast as many teams are spinning them. More then likely, that is the main issue, but I wanted to just bring up a couple of other possible issues.

[ehochstein]

Originally Posted by boarder3512

60% of CIM free speed?

I can't promise that, we coded eleven buttons to control the speed. Button 1 was 10%, 2 -> 20% etc. We ran it on buttons 6 and 7.

I uploaded a video of our shooter at 1000 frames/sec http://youtu.be/7dN1thFqr7k

[Oldbikerider]

Originally Posted by Wiifi

I uploaded a video of our shooter at 1000 frames/sec http://youtu.be/7dN1thFqr7k

Great video, thanks for posting.

What surprised me at first in your video, and in other slow motion videos of frisbee shooters is how little slip there is between the disc and the vertical surface opposite the wheel.

Has anyone done AB tests with and without friction material added on that surface? I don't think there would be much difference.

Graham.

[Al Skierkiewicz]

These tires are not balanced as that is not needed in normal operation.