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WileyB-J
12-01-2012, 23:31
Just a preliminary test on a prototype, should be a fun year!

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

http://farm8.staticflickr.com/7034/6692124841_2cc8e30c97_b.jpg
Kenichi
12-01-2012, 23:41
very nice! but are you willing to sacrifice a cim motor for your shooter?
WileyB-J
12-01-2012, 23:43
Hell no! Its rather easy to "make" a cim and we plan on doing that! Just a first run with an idea.
FRC3883FRC
12-01-2012, 23:44
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.
krazyman1013
12-01-2012, 23:46
I like it but does it only have a single degree for aiming?
WileyB-J
12-01-2012, 23:47
I like it but does it only have a single degree for aiming?

Nope! Still have a few cards on my chest!
MattC9
12-01-2012, 23:51
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.
WileyB-J
12-01-2012, 23:53
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.

You are correct! Run a 775 at a 2.7:1 ratio and bam! Cim-u-lation.
Dr Theta
12-01-2012, 23:56
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.
Mk.32
13-01-2012, 00:30
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?
Aren Siekmeier
13-01-2012, 02:55
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?

^ 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.
ThaineP
13-01-2012, 08:40
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.
Chris is me
13-01-2012, 09:02
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.

With a longer ball path, you can put more backspin (or topspin if you have an inverted shooter) on the ball. Simpler than software!
Tazlikesrobots
13-01-2012, 09:12
Nice shot :D
kinganu123
13-01-2012, 09:24
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
Siri
13-01-2012, 09:36
Definitely a nice start! How far was that?
WileyB-J
13-01-2012, 10:30
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.

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

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?

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

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.

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

Definitely a nice start! How far was that?

A good 30 something feet.
TEAMROCK2000
15-01-2012, 23:22
Why is there a fly wheel on there and what does it do?
WileyB-J
17-01-2012, 21:48
Why is there a fly wheel on there and what does it do?

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
andrewthecow
18-01-2012, 11:20
How is the CIM connected to the axel the wheels spin on and how is the axel connected to the wheels?
WileyB-J
18-01-2012, 20:19
How is the CIM connected to the axel the wheels spin on and how is the axel connected to the wheels?

A whole lotta set screws.
pfreivald
18-01-2012, 20:59
Oooh, set screws are evil! Embrace the spring pin...
WileyB-J
23-01-2012, 20:00
Update!

Time to get rid of the SIM, shame you can only have 4..
New custom transmission with a RS-775:
https://fbcdn-sphotos-a.akamaihd.net/hphotos-ak-snc7/407330_10151181651110702_774960701_22666682_192566 4050_n.jpg

Just a first run gearbox, the final one will be lighter and look pretty.
Taylor Hawkins
23-01-2012, 20:50
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

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.
WileyB-J
23-01-2012, 23:30
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.

its 3.6:1 hawkins.. (50T&14T)
Taylor Hawkins
24-01-2012, 06:40
its 3.6:1 hawkins.. (50T&14T)

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.