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#1
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Re: Shooter opposite wall
We just used lexan strips to shim our shooter until we got the right compression. We weren't going for max distance or anything though, we just wanted the disc to end up in the goal.
This is definitely a part of the shooter that you can settle for "good enough" in instead of "perfect". |
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#2
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Re: Shooter opposite wall
Quote:
Of course, this brings up an important point - always make sure you are designing to your own design's requirements. Doing the little things right can make a big difference if your design relies on great precision. If you don't need that level of precision, you probably can spend your effort elsewhere. |
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#3
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Re: Shooter opposite wall
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#4
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Re: Shooter opposite wall
We used a flat piece of pool noodle about 3/8 inches thick. That was covered with a piece of 1/16 adhesive-backed rubber. This setup worked the best for our shooter after extensive testing.
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#5
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Re: Shooter opposite wall
We use what some people call the roll-on equivalent of the polyurethane roller material 254 and other teams use. It's Scotch® Rubber Mastic Tape 2228, and it looks like this. It comes in a few widths. I believe we picked it up at OSH.
As for compression, we didn't measure. Our wheels and the motor mounts were adjustable, so we started testing with just a little bit, adding compression until the distance stopped increasing or started decreasing. Last edited by ablatner : 13-08-2013 at 19:57. Reason: Added about compression |
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#6
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Re: Shooter opposite wall
We found through testing that in terms of maximizing distance and precision it depended on your rpm at wheel. At higher RPM's (I don't recall the exact numbers, I can dig up the data if your interested) we found a grippier material helped to impart spin to the disc (albeit this slowed the disc down due to higher friction). However, we noticed that gripper materials introduced more variability in the system. So we switched to a slower (medium ) RPM and a smooth polished aluminum surface which we put a little graphite powder on. This kept the spin at a high rate and still gave us the distance the higher speeds were giving us.
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#7
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Re: Shooter opposite wall
We used tape that has a surface similar to a corkboard opposite our two plaction shooter wheels. The compression was pretty massive, as well- I can measure it tomorrow, but the frisbee bends quite a bit. Compression wasn't pre-determined, we built our shooter to adjust compression and tested until we got the best range. Due to these factors, we got some wicked spin on the frisbee, enough to make it near impossible to catch at outreach events where we were shooting to people.
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