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-   -   pic: 2012 FRC971 Transmission Actual (http://www.chiefdelphi.com/forums/showthread.php?t=107999)

roystur44 24-08-2012 15:51
pic: 2012 FRC971 Transmission Actual
 

steelerborn 24-08-2012 15:52
Re: pic: 2012 FRC971 Transmission Actual
 
Really like this setup! You guys had a great bot this year!

Do you have an overall weight for the transmission? It looks very light weight, plus with AL gears.

AllenGregoryIV 24-08-2012 18:42
Re: pic: 2012 FRC971 Transmission Actual
 
This is a very nice looking gearbox.

How do you mount the two gears to the output of the CIM that allow you to do single reduction?

What is the part number/soruce for the pancake cylinder they seem really useful in this application.

James Kuszmaul 24-08-2012 19:46
Re: pic: 2012 FRC971 Transmission Actual
 
Quote:
Originally Posted by AllenGregoryIV (Post 1183081)
How do you mount the two gears to the output of the CIM that allow you to do single reduction?
Not entirely sure what you are asking here, but the way the gears are mounted to the CIM shaft is by pressing a hex sleeve over the CIM shaft, then using the hex to mount the gears. If I remember correctly, then the smaller gear is 15 tooth, the larger is 30, and then the two gears in the second stage are 60 tooth and 45 tooth, respectively.
Quote:
Originally Posted by AllenGregoryIV (Post 1183081)
What is the part number/soruce for the pancake cylinder they seem really useful in this application.
Bimba FO-020.3-3FMT

AllenGregoryIV 25-08-2012 01:05
Re: pic: 2012 FRC971 Transmission Actual
 
Quote:
Originally Posted by James Kuszmaul (Post 1183089)
Not entirely sure what you are asking here, but the way the gears are mounted to the CIM shaft is by pressing a hex sleeve over the CIM shaft, then using the hex to mount the gears. If I remember correctly, then the smaller gear is 15 tooth, the larger is 30, and then the two gears in the second stage are 60 tooth and 45 tooth, respectively.

Bimba FO-020.3-3FMT
That's exactly what I was asking, thank you for the quick response.

DampRobot 25-08-2012 02:21
Re: pic: 2012 FRC971 Transmission Actual
 
If I were to design up a transmission like this, I would get a lot of flack from the programming leadership about not including space for an encoder. Did you end up including one that we can't see, or was there an argument for not including one?

MichaelBick 25-08-2012 03:17
Re: pic: 2012 FRC971 Transmission Actual
 
Quote:
Originally Posted by DampRobot (Post 1183115)
If I were to design up a transmission like this, I would get a lot of flack from the programming leadership about not including space for an encoder. Did you end up including one that we can't see, or was there an argument for not including one?
Most teams who do WCD end up just connecting an encoder to another wheel(any of the front or back wheels) and then zip tying the encoder wire down to the bellypan. I can speak for 971 but I assume they did this too.

Chris is me 25-08-2012 12:13
Re: pic: 2012 FRC971 Transmission Actual
 
Quote:
Originally Posted by MICHAELABICK (Post 1183119)
Most teams who do WCD end up just connecting an encoder to another wheel(any of the front or back wheels) and then zip tying the encoder wire down to the bellypan. I can speak for 971 but I assume they did this too.
971's drive wasn't a WCD, and since they used dead axles, I doubt this was the method they chose.

Nick Lawrence 25-08-2012 15:13
Re: pic: 2012 FRC971 Transmission Actual
 
This is actually beautiful.

Man, you guys make some of the nicest robots around.

-Nick

kevincrispie 25-08-2012 15:23
Re: pic: 2012 FRC971 Transmission Actual
 
Quote:
Originally Posted by DampRobot (Post 1183115)
If I were to design up a transmission like this, I would get a lot of flack from the programming leadership about not including space for an encoder. Did you end up including one that we can't see, or was there an argument for not including one?
The encoders aren't part of the transmission. They are off on the back wheels on a plastic gear I believe.

DampRobot 25-08-2012 15:50
Re: pic: 2012 FRC971 Transmission Actual
 
Quote:
Originally Posted by kevincrispie (Post 1183153)
The encoders aren't part of the transmission. They are off on the back wheels on a plastic gear I believe.
And just to be clear, did you ever end up using them? In my experience, they are often a pain to design in, and not that useful for the programming team.

Cory 25-08-2012 16:01
Re: pic: 2012 FRC971 Transmission Actual
 
Quote:
Originally Posted by DampRobot (Post 1183155)
And just to be clear, did you ever end up using them? In my experience, they are often a pain to design in, and not that useful for the programming team.
Why do you find them to be not very useful?

Garret 25-08-2012 16:12
Re: pic: 2012 FRC971 Transmission Actual
 
Quote:
And just to be clear, did you ever end up using them? In my experience, they are often a pain to design in, and not that useful for the programming team.
If you just use the AM encoder bracket for the E4P ts really straight forward to design them in; from memory I think its something like .75" out to each side and .1875" down for the mounting holes with respect to the shaft.

R.C. 25-08-2012 18:05
Re: pic: 2012 FRC971 Transmission Actual
 
Quote:
Originally Posted by DampRobot (Post 1183155)
And just to be clear, did you ever end up using them? In my experience, they are often a pain to design in, and not that useful for the programming team.
Pretty easy to design in. Just drill a 1/4 hole and shove a s4 in. Literally no work at all.

-RC

DampRobot 25-08-2012 19:51
Re: pic: 2012 FRC971 Transmission Actual
 
Quote:
Originally Posted by Cory (Post 1183156)
Why do you find them to be not very useful?
The theory always seems to be that they will get used for autonomous tracking or smoothing out driver control or something. Because the programming team seems to have so much trouble even getting basic functionality, they never end up getting used.

I don't mean that it's hard to design in two drilled holes. I mean that often both sides of the output shaft are used, so there is no easy place for an encoder.

Thanks for the tip about zip-tieing the encoder to the bellypan, and putting it on a wheel shaft. Wouldn't that cause them to rotate off axis?


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