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Unread 13-06-2008, 06:10
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Re: pic: 968's 2006 practice bot chassis

I keep forgetting to find out where they chrome the wheels. No one locally does it here in Hawaii. Liking the "bling bling."
Sorry 968, we really are not trying to look more and more like your bots.
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Unread 13-06-2008, 09:18
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Re: pic: 968's 2006 practice bot chassis

I have to say that that's one of the best parts of FIRST, you can always use ideas from other robots, but they'll almost alway look completely different.
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Unread 13-06-2008, 10:11
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Re: pic: 968's 2006 practice bot chassis

I agree that this is a very good drive base that has really become the signature for many westcoast teams. But I still wouldn't build one for any of my bots, still don't see any point of exposing my wheels like that... (I know because I saw my team knock two of 254's wheels off in 2005)
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Unread 13-06-2008, 11:48
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Re: pic: 968's 2006 practice bot chassis

What's that aluminum on the back for?
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Unread 13-06-2008, 11:49
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Re: pic: 968's 2006 practice bot chassis

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Originally Posted by cooker52 View Post
What's that aluminum on the back for?
It's a roller that helps to keep the chassis from riding up onto balls.
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Unread 13-06-2008, 11:54
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Re: pic: 968's 2006 practice bot chassis

Thanks.

Did you guys also have another piece to this? I see nuts that look like they're for an expansion.
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Unread 13-06-2008, 12:09
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Re: pic: 968's 2006 practice bot chassis

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Originally Posted by cooker52 View Post
Thanks.

Did you guys also have another piece to this? I see nuts that look like they're for an expansion.
Yes

http://www.chiefdelphi.com/media/photos/23983
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Unread 13-06-2008, 13:09
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Re: pic: 968's 2006 practice bot chassis

Eh, the shiny wheels are protected (heh, and covered up) by bumpers nowadays. If I remember correctly, there were no bumpers in 2005. It's still a great solid drive system.

I have to admit I can't figure out how to elegantly mount an AM super shifter to it, but I figure there's still plenty of time to work it out.
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Unread 13-06-2008, 13:22
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Re: pic: 968's 2006 practice bot chassis

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Originally Posted by JesseK View Post
Eh, the shiny wheels are protected (heh, and covered up) by bumpers nowadays. If I remember correctly, there were no bumpers in 2005. It's still a great solid drive system.

I have to admit I can't figure out how to elegantly mount an AM super shifter to it, but I figure there's still plenty of time to work it out.
Mounting a SS should be pretty "simple." Just make your own symmetrical side plates, assemble with standoffs, and have two holes designed in that are co linear with the output shaft of the center wheel. Those two holes allow the gearbox to bolt to the chassis member.
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Unread 13-06-2008, 18:09
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Re: pic: 968's 2006 practice bot chassis

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Originally Posted by CraigHickman View Post
Mounting a SS should be pretty "simple." Just make your own symmetrical side plates, assemble with standoffs, and have two holes designed in that are co linear with the output shaft of the center wheel. Those two holes allow the gearbox to bolt to the chassis member.
If you line up your cross members right, you can bolt on the SS's without any modification to them (besides longer bolts). 973 did that this year as we didn't have the resources to make our own gearbox plates. I'll take pictures when I can.
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Unread 16-06-2008, 10:30
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Re: pic: 968's 2006 practice bot chassis

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Originally Posted by AdamHeard View Post
If you line up your cross members right, you can bolt on the SS's without any modification to them (besides longer bolts). 973 did that this year as we didn't have the resources to make our own gearbox plates. I'll take pictures when I can.
We did something similar this year with the SS's. We used an exactly dimensioned (with 1/16" tolerance) wooden block with manually CNC'ed holes to represent the SS to get the exact spacing correct while welding. The SS was positioned above the inside frame rail on either side. However, the output shaft wasn't inlined with the middle wheel.

During the design phase it appeared to be more weight to put bearing blocks for direct drive than it was to run more flat AM sprockets & chain, so I went with the 2-chained approach with tensioners directly mounted to the transmission (another bad idea). In hindsight, complexity of maintaining the chain system was what hurt us most this year, so it would have been much more simple to directly drive the middle wheel. We saw 254 & 233's bots in Vegas '07, and saw the simplicity of direct-drive on the middle wheel yet we didn't heed the reasons why. Coulda-shoulda-woulda's aside, maybe it's better we made our mistakes ourselves?

The good news is, we didn't modify our SS's so now we {should} be able to use them again next year if the rules don't change. Now if we could only figure out where this little plastic washer goes on the SS that appeared out of nowhere on our table...
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Unread 16-06-2008, 21:25
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Re: pic: 968's 2006 practice bot chassis

Quote:
Originally Posted by AdamHeard View Post
If you line up your cross members right, you can bolt on the SS's without any modification to them (besides longer bolts). 973 did that this year as we didn't have the resources to make our own gearbox plates. I'll take pictures when I can.
Pic 1
Pic 2
Pic 3
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Unread 04-07-2008, 22:20
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Re: pic: 968's 2006 practice bot chassis

i could never understand how the wheels stay on. could someone please explain this to me
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Unread 04-07-2008, 22:25
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Re: pic: 968's 2006 practice bot chassis

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Originally Posted by team2061 View Post
i could never understand how the wheels stay on. could someone please explain this to me
We use snap rings to hold the wheels on.

You can see this here , sort of. There's a groove in the shaft outside the sprocket. The snap ring expands to fit over the shaft, and then contracts when it is seated in the groove, and then keeps the wheels/sprockets from sliding off.
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Unread 06-07-2008, 01:17
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Re: pic: 968's 2006 practice bot chassis

For some reason I can't edit my post. Here's the right link
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