Re: Linear Path Shooter vs. Circular Path Shooter?
 

Our circular (90) degree shooter uses and AM pneumatic 7.5 inch wheel with a 32 tooth sprocket on it and a 25 tooth sprocket on the CIM. We have it set up so the wheel is hitting just above the widest diameter of the disk and just below the widest diameter of the tire with about 1/4 inch of compression and the tire at maybe 10psi. This ensures the disk does not ride up on the tire. This puppy will hit the top of a 10 foot door at 45 feet. up down variation is about 6 inches and side to side variation is almost nonexistent.
This is just with a plywood POC. You can read that as Proof of Concept or Piece of C&^%. Whatever. Still need to add a guide on the outer rail to keep the disk from riding up on that.
We have also tested a straight shooter bot so far it is not as consistent and much less powerful even with 2 wheel powered by separate CIMs.
Still plan on a little more testing here as I think it would be easier to incorporate to the robot.

Re: Linear Path Shooter vs. Circular Path Shooter?
 

You posted this identical post in three different threads.

http://www.chiefdelphi.com/forums/sh...46#post1213846

http://www.chiefdelphi.com/forums/sh...56#post1213856

It might be better to post it once and provide a link.

bilbo911 what camera
 

Hey I was wondering what kind of high speed camera do you have and how much did it cost??
Thanks

Re: Linear Path Shooter vs. Circular Path Shooter?
 

What do you guys think about an in-line loader and shooter, similar to 548's design last year? Other than some difficulty getting it compact enough to fit length wise and keeping it stable at the very end (since the CIMs would be placed at the tip of the "cannon") it seems the easiest to aim because there is no second loading mechanism that has to stay in alignment.

Re: Linear Path Shooter vs. Circular Path Shooter?
 

Is there a point where too much rpm on the flywheel causes the exit velocity of the Frisbee to drop?

Re: Linear Path Shooter vs. Circular Path Shooter?
 

http://www.chiefdelphi.com/forums/sh...2&postcount=55

Re: Linear Path Shooter vs. Circular Path Shooter?
 

Okay, thank you. Now to expand on my question. How can we tell (without a high speed camera) when this is happening? Should we just very the voltage until we find it shoots the furthest? What is the best way of going about this?

Re: bilbo911 what camera
 

It is the GoPro HERO 3 Black edition. Right now they are listed at $399.99. It is capable of WVGA at 240 f/s.

Re: Linear Path Shooter vs. Circular Path Shooter?
 

Has anyone thought of whether a benefit could derive from a hybrid combination of a 90 degree circular shooter with a linear double wheel shooter?
There would only be one wheel but the frisbee would be pinched twice during its transit through the launcher.

The twist would be that instead of a pure circular arc roll edge shape, the shape would be a straight going into a 90 degree corner having a radius that matches the frisbee. So there would be linear roll contact with wheel for some period, then the frisbee would separate from wheel and whip around through the sharp 90 degree corner radius, going back to contact the wheel a second time, and then exiting rolling against a straight edge.

Would the effect of being whipped around the sharper corner help to possibly give some better acceleration grip from a higher centrifugal force there than a larger arc, despite there being no pressure from the wheel while going through the corner, or is it just the wheel squeeze that transfers all the energy, and longer squeeze contact is the main goal?

Also, could a straight roll edge going past the wheel then transition to a spiral curve shape on the outlet side to improve acceleration?

-Dick Ledford

Re: Linear Path Shooter vs. Circular Path Shooter?
 

Very interesting information. TNX
Question is: Where you driving the 8" wheel with a single CIM?

Re: Linear Path Shooter vs. Circular Path Shooter?
 

Jon, who were you asking that question of?

Re: Linear Path Shooter vs. Circular Path Shooter?
 

Bruceb:

Sorry for the confusion. I intented to address the question to billbo911.

billbo911:

Very interesting & useful information. TNX
Question is: Were you directly driving the 8" wheel with a single CIM?

Re: Linear Path Shooter vs. Circular Path Shooter?
 

Yes, it is an AndyMark 8in. Plaction wheel with roughtop tread.

It is being direct driven by an AndyMark 8mm Key Hub from a CIM. Alrhough, we also did a test with the Mini CIM and it worked well too, but the current draw was higher.

Re: Linear Path Shooter vs. Circular Path Shooter?
 

Keep in mind that AM probably hasn't don't impact testing at high speeds (2k rpm +). If you're keen on using 8" AM wheels for the actual robot, perhaps you're better off paying for 1 single Aluminum wheel that doesn't flex than 2 or more plaction wheels that may (or may not) shatter. Personally, I'd put as many discs through that launcher as possible just to see what the wear will be like.

Re: Linear Path Shooter vs. Circular Path Shooter?
 

Our team is currently prototyping both a linear and curved shooter.

We posted a video on YouTube:
http://www.youtube.com/watch?v=bsaWp0URvN4