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Unread 12-21-2011, 12:44 AM
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Team 1625 8 Wheel Drive Prototype







This is the 8 wheel prototype team 1625 has been working on for the past few weeks. One wheel is driven straight off of the gearbox, and chains run from the sprockets on that axle to the other wheel assemblies on that side, as pictured above. The wheel assemblies are half inch steel axles with two 21 tooth sprockets welded to them and a 3" colson pressed on the end. They slide through two bearings in the frame tube and have a snap ring on the back side. The chains are currently just tensioned by the proper center to center distance, but on the next iteration we plan to use bigger wheels to allow for ground clearance with idler sprocket tensioners. There is also an extended section of the gearbox shaft to allow for easy encoder mounting.

Specifications:
3/16" Center Wheel Drop
13.5 Feet Per Second Calculated Speed
Single Speed Gearbox
41 Pounds With Electronics
3" by 7/8" Colson Wheels
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Unread 12-21-2011, 01:59 AM
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Re: Team 1625 8 Wheel Drive Prototype

I like it! Simple and clean looking! Those 3 inch colsons look awesome pressed on with the gears!

-Dave
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Unread 12-21-2011, 05:34 AM
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Re: Team 1625 8 Wheel Drive Prototype

Elegant. I imagine it handles well.

How did you cross-brace the frame?
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Unread 12-21-2011, 06:32 AM
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Re: Team 1625 8 Wheel Drive Prototype

Those chains look too close to the ground for comfort. But cool bot anyway!
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Unread 12-21-2011, 07:06 AM
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Re: Team 1625 8 Wheel Drive Prototype

Quote:
Originally Posted by Ninja_Bait View Post
Those chains look too close to the ground for comfort. But cool bot anyway!
I agree, especially since only two wheels are truly driven. Having 75% of the drive train without direct connection to the transmission would make me a bit queasy, but then again, I'm not Winnovative.
I love those gearboxes.
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Unread 12-21-2011, 07:59 AM
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Re: Team 1625 8 Wheel Drive Prototype

I really like what you guys did with the one piece axle/colson hub/sprocket. How much does the entire shaft assembly weigh without the wheel?
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Unread 12-21-2011, 09:06 AM
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Re: Team 1625 8 Wheel Drive Prototype

Very nice.

What is the final ratio to the wheels? (nvmd somehow missed your little follow up underneath the pictures)


I cant quite tell from the picture, #25 or #35 chain? Follow up question- tensioning?

Looks slick!

-Brando
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Last edited by Brandon Holley : 12-21-2011 at 10:05 AM.
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Unread 12-21-2011, 09:26 AM
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Re: Team 1625 8 Wheel Drive Prototype

Quote:
Originally Posted by thefro526 View Post
I really like what you guys did with the one piece axle/colson hub/sprocket. How much does the entire shaft assembly weigh without the wheel?
I feel like we talked to Aren and Foss about the single piece assembly a few weeks ago
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Unread 12-21-2011, 04:54 PM
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Re: Team 1625 8 Wheel Drive Prototype

Quote:
Originally Posted by Richard View Post
How did you cross-brace the frame?
It's obviously the two pieces of plywood that are zip tied on.
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Last edited by Dillon Carey : 12-21-2011 at 05:24 PM.
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Unread 12-21-2011, 06:07 PM
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Re: Team 1625 8 Wheel Drive Prototype

Quote:
Originally Posted by Brandon Holley View Post
Very nice.


I cant quite tell from the picture, #25 or #35 chain? Follow up question- tensioning?
Between seeing a lot of 35 lately and knowing typical winnovation, I'm 99% sure its #25.

As for tensioning,
Quote:
The chains are currently just tensioned by the proper center to center distance, but on the next iteration we plan to use bigger wheels to allow for ground clearance with idler sprocket tensioners.
Its pretty easy to miss the text under the pretty pictures.
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Unread 12-22-2011, 06:47 PM
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Re: Team 1625 8 Wheel Drive Prototype

That wiring sure is a thing of beauty.... lololololol
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Unread 12-22-2011, 06:52 PM
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Re: Team 1625 8 Wheel Drive Prototype

Quote:
Originally Posted by Lightfoot26 View Post
That wiring sure is a thing of beauty.... lololololol
It looks like it would be a bit of a pain to service, with all the wires going in and out of holes and tubes and things. It looks nice, but it seems like too much trouble for not enough gain.
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Unread 12-22-2011, 07:00 PM
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Re: Team 1625 8 Wheel Drive Prototype

on the contrary my dear friend, you have yet to see the bottom, plus I had labeled them all ect. ect. it was a very meticulous process... PLUS do it right the first time... you won't have to service it
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Unread 12-26-2011, 11:58 AM
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Re: Team 1625 8 Wheel Drive Prototype

Quote:
Originally Posted by Richard View Post
Elegant. I imagine it handles well.

How did you cross-brace the frame?
The frame is cross braced by two welded 2X1 tubes. They're about 6 inches in from either side, but we probably plan on changing that depending upon the game.

Quote:
Originally Posted by thefro526 View Post
I really like what you guys did with the one piece axle/colson hub/sprocket. How much does the entire shaft assembly weigh without the wheel?
Thanks! We thought that would be a nice way to make it simpler all around. According to the CAD, the it weighs about .3 pounds.

Quote:
Originally Posted by Brandon Holley View Post

I cant quite tell from the picture, #25 or #35 chain?
Looks slick!

-Brando
Thank you! We used #25 chain, and it seems to work out well. The middle chain runs are a little bit less tensioned than we would like, but we plan on fixing that when we add the bigger wheels. Even though it is a little bit loose it still has never fallen off.
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Unread 12-27-2011, 04:59 AM
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Re: Team 1625 8 Wheel Drive Prototype

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