2386 prototype shooter
 

Just a preliminary test on a prototype, should be a fun year!

http://www.flickr.com/photos/wileyb-j/6688012541/

Re: 2386 prototype shooter
 

very nice! but are you willing to sacrifice a cim motor for your shooter?

Re: 2386 prototype shooter
 

Hell no! Its rather easy to "make" a cim and we plan on doing that! Just a first run with an idea.

Re: 2386 prototype shooter
 

Thats one big issue with using a cim motor for ball tossing. As of rule [r38] it limits the robot to olny 4 cim motors. Thats why my team is trying to use pneumatics for launching the ball to the hoops. Still looked very good. Nice job.

Re: 2386 prototype shooter
 

I like it but does it only have a single degree for aiming?

Re: 2386 prototype shooter
 

Nope! Still have a few cards on my chest!

Re: 2386 prototype shooter
 

There are CIM-ulators and CIM-Sim gear boxes that allow you to use a "5th CIM" but it's just a rs-775 or a FP with a gear box. It does give you the same output RPMs of a regular CIM.

Re: 2386 prototype shooter
 

You are correct! Run a 775 at a 2.7:1 ratio and bam! Cim-u-lation.

Re: 2386 prototype shooter
 

I'm kind of curious what the weight of that flywheel is. That is some impressive distance. I really like the simplicity of this prototype.

Re: 2386 prototype shooter
 

My question(s) how long does that take to spin up?
And how many balls can you feed though it before it slows down significantly?

Re: 2386 prototype shooter
 

^ This.

Because, am I seeing correctly that you are driving the wheels directly off the CIM? :ahh: Certainly not totally ridiculous, but I would expect it to have a little more trouble accelerating the ball than is observed.

Re: 2386 prototype shooter
 

I think you'll notice a bit of an erratic spin difference between different launch speeds with the static bar. My team is doing something similar, but with two sets of wheels, one on the top and one on the bottom so we can control spin if needed.

Nice job.

Re: 2386 prototype shooter
 

With a longer ball path, you can put more backspin (or topspin if you have an inverted shooter) on the ball. Simpler than software!

Re: 2386 prototype shooter
 

Nice shot :D

Re: 2386 prototype shooter
 

In terms of the cim-u-lation, wouldn't torque play a factor, because those motors, even with the gearbox, have a nominal amount of torque

Re: 2386 prototype shooter
 

Definitely a nice start! How far was that?

Re: 2386 prototype shooter
 

Nice eye! Its just an aluminum disk, no real measurements thus far.

It takes around 3 seconds, and you can feed at least three with the same trajectory (haven't been able to test more!).

The problem with two sets is the inconsistency in speed/entry for the balls entering the shooter.

A good 30 something feet.

Re: 2386 prototype shooter
 

Why is there a fly wheel on there and what does it do?

Re: 2386 prototype shooter
 

Its used to maintain wheel speed when a ball comes in contact with the launching wheel.

This may help: http://en.wikipedia.org/wiki/Flywheel

Re: 2386 prototype shooter
 

How is the CIM connected to the axel the wheels spin on and how is the axel connected to the wheels?

Re: 2386 prototype shooter
 

A whole lotta set screws.

Re: 2386 prototype shooter
 

Oooh, set screws are evil! Embrace the spring pin...

Re: 2386 prototype shooter
 

Update!

Time to get rid of the SIM, shame you can only have 4..
New custom transmission with a RS-775:


Just a first run gearbox, the final one will be lighter and look pretty.

Re: 2386 prototype shooter
 

The Cim-U-lator that we made is a 3.33:1 ratio and actually gives us a torque rating of 375 oz-in compared to the cim of 344oz-in. So its actually pretty close to the CIM itself.

Re: 2386 prototype shooter
 

its 3.6:1 hawkins.. (50T&14T)

Re: 2386 prototype shooter
 

Your right my mistake. The numbers are off then.

Also if anybody would like the cad drawings for the gearbox let me know and il send it to you.