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Unread 02-01-2015, 19:53
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Sparky 384: Custom DS Transmission (2014 Offseason Project)
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!
Attached Thumbnails
Click image for larger version Name: IMG_1412.JPG Views: 282 Size: 1.69 MB ID: 17702  Click image for larger version Name: transmission_2k15_iso.JPG Views: 166 Size: 690.2 KB ID: 17703  Click image for larger version Name: transmission_2k15_font.JPG Views: 100 Size: 618.8 KB ID: 17704  Click image for larger version Name: transmission_2k15_right.JPG Views: 134 Size: 628.6 KB ID: 17705  
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Unread 02-01-2015, 20:27
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Re: Sparky 384: Custom DS Transmission (2014 Offseason Project)
I would love to see the STEP files for this. Will they be forth coming?
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Unread 02-01-2015, 20:55
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Re: Sparky 384: Custom DS Transmission (2014 Offseason Project)
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?
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Unread 02-01-2015, 20:56
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Re: Sparky 384: Custom DS Transmission (2014 Offseason Project)
One gearbox has an additional blue part http://www.chiefdelphi.com/forums/at...2&d=1420242986
Was is the function of this?
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Unread 02-01-2015, 21:02
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Re: Sparky 384: Custom DS Transmission (2014 Offseason Project)
Quote:
Originally Posted by E_puello View Post
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.
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Unread 02-01-2015, 21:29
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Re: Sparky 384: Custom DS Transmission (2014 Offseason Project)
Quote:
Originally Posted by wilsonmw04 View Post
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.

Quote:
Originally Posted by thatprogrammer View Post
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.
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Last edited by Sparkyshires : 02-01-2015 at 21:49.
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Unread 02-01-2015, 22:01
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Re: Sparky 384: Custom DS Transmission (2014 Offseason Project)
Sorry everyone, here is the .STEP file. Simply click on the link and download:

https://drive.google.com/file/d/0B1Z...ew?usp=sharing
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Unread 02-01-2015, 22:02
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Re: Sparky 384: Custom DS Transmission (2014 Offseason Project)
Thank you for the files.
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Unread 02-01-2015, 22:11
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Re: Sparky 384: Custom DS Transmission (2014 Offseason Project)
Random Question:
Which CAD software do yall use?
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Unread 02-01-2015, 22:16
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Re: Sparky 384: Custom DS Transmission (2014 Offseason Project)
Quote:
Originally Posted by vps View Post
Random Question:
Which CAD software do yall use?
Solidworks 2013-2014. Currently we are between the 2013-2014 and 2014-2015 versions.
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Unread 02-01-2015, 22:29
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Re: Sparky 384: Custom DS Transmission (2014 Offseason Project)
Quote:
Originally Posted by wilsonmw04 View Post
Thank you for the files.
Of course!
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Unread 02-01-2015, 22:56
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Re: Sparky 384: Custom DS Transmission (2014 Offseason Project)
Can you give me the total weight of this gearbox?
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Unread 02-01-2015, 22:58
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Re: Sparky 384: Custom DS Transmission (2014 Offseason Project)
Quote:
Originally Posted by wilsonmw04 View Post
Can you give me the total weight of this gearbox?
Very light. I'll wait for Brooke to chime in on this one as I don't know the specifics, but due to the cheesing (HA!) I want to say around ten pounds.
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Unread 02-01-2015, 23:37
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Re: Sparky 384: Custom DS Transmission (2014 Offseason Project)
Quote:
Originally Posted by wilsonmw04 View Post
Can you give me the total weight of this gearbox?
Hello,

I cant say exactly due to the fact that my memory is horrible, but I will weigh it hopefully tomorrow and get back to you. I do know that it is less than you would expect it to be, I was surprised at it.
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Unread 02-01-2015, 22:09
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Re: Sparky 384: Custom DS Transmission (2014 Offseason Project)
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.
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