Sparky 384: Custom DS Transmission (2014 Offseason Project)

[Fearthewookie]

Hello all,

Attached is a quick look at Sparky's new custom transmission developed during the 2014 off-season. Included are a few renders of the CAD model and a picture of our completed prototypes.

Info:
- Dual speed (8.5 fps low, 18.5 fps high)
- 3 cim
- Integrated belt-driven encoder
- Multiple ratio options available
- Compact & lightweight (.32 lbs per aluminum plate)
- Designed for easy integration with Sparky's modular West Coast style drive rails

Input and questions are always welcome.

Good luck in 2015!

[wilsonmw04]

I would love to see the STEP files for this. Will they be forth coming?

[E_puello]

By having a gear in between the top cim and the first stage aren't you gonna get some funky speed differences between your gears?

[thatprogrammer]

One gearbox has an additional blue part http://www.chiefdelphi.com/forums/at...2&d=1420242986
Was is the function of this?

[chadr03]

Originally Posted by E_puello

By having a gear in between the top cim and the first stage aren't you gonna get some funky speed differences between your gears?

No this will just change the required rotation of the motor. Idler gears will not effect the ratio.

[Sparkyshires]

Originally Posted by wilsonmw04

I would love to see the STEP files for this. Will they be forth coming?

Yeah, they should be up within an hour or so. Definitely before kick off.

Originally Posted by thatprogrammer

One gearbox has an additional blue part http://www.chiefdelphi.com/forums/at...2&d=1420242986
Was is the function of this?

That's a 3d printed encoder mounting bracket.

[Fearthewookie]

Sorry everyone, here is the .STEP file. Simply click on the link and download:

https://drive.google.com/file/d/0B1Z...ew?usp=sharing

[wilsonmw04]

Thank you for the files.

[dellagd]

Looks great guys!

Maybe this is the normal practice, but I hadn't thought to group all of the Powerpoles for all three motors into one connector before. Very tidy.

[vps]

Random Question:
Which CAD software do yall use?

[Madison]

The additional retaining ring groove in the output shaft gives me the heebie jeebies. That's an immediately obvious, clear point of potential failure, so keep an eye on it.

[Fearthewookie]

Originally Posted by Madison

The additional retaining ring groove in the output shaft gives me the heebie jeebies. That's an immediately obvious, clear point of potential failure, so keep an eye on it.

Hi Madison,

Im not sure I understand, which specific groove on the output shaft? Why does this worry you?

Thanks

[Fearthewookie]

Originally Posted by vps

Random Question:
Which CAD software do yall use?

Solidworks 2013-2014. Currently we are between the 2013-2014 and 2014-2015 versions.

[Fearthewookie]

Originally Posted by dellagd

Looks great guys!

Maybe this is the normal practice, but I hadn't thought to group all of the Powerpoles for all three motors into one connector before. Very tidy.

Hello!

Im not sure this is common practice either, but due to our modular West Coast style drive rails (our drive system unbolts from the chasis in order to allow for maintenance or emergency swap-outs), our transmissions need to be easily disconnected. We found this is the best and cleanest way to do so.

I am including an image of our modular system used at 2014 offseason competitions. The transmission pictured is last years custom one speed. (its beige simply because it was an r&d project). This was taken during a dissassembly to train new members, so the middle wheel is of course missing.


Thanks

[Fearthewookie]

Originally Posted by wilsonmw04

Thank you for the files.

Of course!