4183's Full Auto Shooter
 

We decided to see how fast we could shoot a bunch of Frisbees. The shooter is a standard dual 8" pneumatic wheel one, with a mini-CIM and a CIM in direct drive. We got our speed control working today. The code fires the next Frisbee as soon as the speed recovers.

http://www.youtube.com/watch?v=AfY-uYwHv50

The distance is half court.

Re: 4183's Full Auto Shooter
 

class 1 laser?

Re: 4183's Full Auto Shooter
 

Illegal but temporary laser. Our real robot uses the pyramid or the camera to align.

Re: 4183's Full Auto Shooter
 

More of our progress:


CAD of final robot; should be submitted to sheet metal shop tomorrow-ish. Doesn't show shooter support/ tilting/ hanging mechanism



Prototype robot featured in video. Built on off-season drivetrain. Prototype intake in bottom-left corner.



Driver station, complete with our custom game-pad/ pistol grip controller and my precious, fluffy dog.

200th POST!!!

Re: 4183's Full Auto Shooter
 

Looks good. Seems like you have some vibration in the system, though ... ;)

Re: 4183's Full Auto Shooter
 

...Indeed. We need to find a tire shop that can balance a tire on a 4 inch rim.

We have made a fair attempt at it using some screws as counterweights taped inside the rim opposite the valve stem.

Re: 4183's Full Auto Shooter
 

When you say taped, you don't mean 'adhesive attempting to hold pointy metal objects onto a wheel spinning at 6,000 RPM', do you?

Please be safe ::ouch:: Even duct tape cannot guarantee safety here.

Awesome shooter, though! And very cute dog.

Re: 4183's Full Auto Shooter
 

When you see the shooter from a non first person mode it doesn't vibrate as much as it appears in the video, especially for a prototype made of wood and bolts.

Re: 4183's Full Auto Shooter
 

Yes, they are held in place *inside* the rim with double-sided foam poster mounting tape. The centrifugal force of spinning presses the screws more tightly into the tape. In order to fall out, they'd have to violate a couple of the laws of physics.

We will use hot glue to install them on the final assembly.

Re: 4183's Full Auto Shooter
 

I'm digging the earthquake simulator your robots also works as.

Re: 4183's Full Auto Shooter
 

How are you reading the motor speed and sending it to the code with direct drive?

Re: 4183's Full Auto Shooter
 

Here is 706's full auto shooter. We slow it down an auton but watch after that. Driver justs holds the trigger down.
Sorry if you have seen this already, I just think it is so cool.

Re: 4183's Full Auto Shooter
 

dang it this link didnt show up
http://www.youtube.com/watch?v=zViWA9QbeJ4

Re: 4183's Full Auto Shooter
 

Cool! I liked how fast it recovers!
Are you using a bang-bang controller or a PID controller?
If it's a PID, how much time did you spend on optimizing it?

Re: 4183's Full Auto Shooter
 

We're using optical switches. A small metal tab passes through it once a revolution and we measure the time between pulses to determine the RPM.