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pic: 968's 2006 practice bot chassis
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Re: pic: 968's 2006 practice bot chassis
Gorgeous system. We can all learn so much from this drive base. It doesn't matter who built it, students or mentors (yeah, I know some people would complain about it being made by some mentors... but that's not the issue I'm talking about here). What does matter, however, is that this is (nearly) perfect engineering. The West Coast Drive is essentially the penultimate drive base, in my opinion. 254 and 968 have boiled out any unnecessary material and structure.
Hey, while I'm at it, does anyone from either 968 or 254 happen to know how much that base (as pictured) would weigh? I'm doing some design work, and it would be nice to have something to compare to. |
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EDIT: removed something that apprently ticked someone off... |
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.":P
Sorry 968, we really are not trying to look more and more like your bots.:D |
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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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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Re: pic: 968's 2006 practice bot chassis
What's that aluminum on the back for?
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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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http://www.chiefdelphi.com/media/photos/23983 |
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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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Now I know where the expression "solid as a RAWC" comes from:ahh:
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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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i could never understand how the wheels stay on. could someone please explain this to me
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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. |
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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oh ok thanks now i understand
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