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-   -   Wheel Size? (http://www.chiefdelphi.com/forums/showthread.php?t=99445)

Apeace 07-01-2012 23:48
Wheel Size?
 
I just noticed that the rule book has no mention of the wheel size constraints. Any thoughts?

the man 07-01-2012 23:52
Re: Wheel Size?
 
I think it may be possible to get over the 4" bump with no restrictions, besides I guess a 38" wheel...

davidthefat 07-01-2012 23:53
Re: Wheel Size?
 
You can make your robot have two bike wheels and it will be fine assuming that you can program your robot to stay balanced at a flat angle.

the man 07-01-2012 23:54
Re: Wheel Size?
 
Did some one say segway bot?

Andrew Lawrence 07-01-2012 23:54
Re: Wheel Size?
 
As long as none of your wheels are above 60 inches in diameter, I'm sure everything will be just fine.

I so want to use 60" wheels now!

davidthefat 07-01-2012 23:55
Re: Wheel Size?
 
Quote:
Originally Posted by SuperNerd256 (Post 1098966)
As long as none of your wheels are above 60 inches in diameter, I'm sure everything will be just fine.

I so want to use 60" wheels now!
But the wheel needs to be contained in the bumper perimeter... Or did that change this year?

PayneTrain 07-01-2012 23:56
Re: Wheel Size?
 
I don't want to rain on your parade, but they couldn't possibly be any larger than 36 inches in diameter if you plan on building a 28x38 inch frame around them.

the man 07-01-2012 23:56
Re: Wheel Size?
 
That why I said 38" the maximum no height dimension.

Apeace 07-01-2012 23:59
Re: Wheel Size?
 
So it sounds like you could use larger wheels to get over the barrier much easier?

davidthefat 08-01-2012 00:00
Re: Wheel Size?
 
Quote:
Originally Posted by Apeace (Post 1098981)
So it sounds like you could use larger wheels to get over the barrier much easier?
Other than design constraints, nothing is stopping you from doing it.

Flimsor 08-01-2012 00:05
Re: Wheel Size?
 
I think we should use a custom sized tank drive system that is the exact maximum dimensions allowed. That way, if the robot gets flipped over it can still drive, and we can get over the bump.:cool:

ThaineP 08-01-2012 11:14
Re: Wheel Size?
 
You should totally make adaptive-geometry wheels to get over the bump in the middle. :D

Ernst 08-01-2012 12:28
Re: Wheel Size?
 
Quote:
Originally Posted by ThaineP (Post 1099311)
You should totally make adaptive-geometry wheels to get over the bump in the middle. :D
How about a Tweel?
They might be used in future lunar rovers, so they should be good enough for FIRST.

couvillion 08-01-2012 15:19
Re: Wheel Size?
 
Along the lines of cool and not really helpful.



I have not been able to come up with a engineering reason as to why tri-star wheel is better than a regular wheel of the same over all size. But like the design all the same. For those that aren't sure what is going on here it is the same setup as a planetary gear system with the ground acting as the ring gear.

ratdude747 08-01-2012 15:41
Re: Wheel Size?
 
Quote:
Originally Posted by couvillion (Post 1099585)
Along the lines of cool and not really helpful.



I have not been able to come up with a engineering reason as to why tri-star wheel is better than a regular wheel of the same over all size. But like the design all the same. For those that aren't sure what is going on here it is the same setup as a planetary gear system with the ground acting as the ring gear.
I remember seeing an old 2004 clip on youtube with a bot that used them to climb the stairs...


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