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-   -   4 inch Wheel of Doom (http://www.chiefdelphi.com/forums/showthread.php?t=70124)

R.C. 21-11-2008 23:12
4 inch Wheel of Doom
 






This is one of our new 4 wheels that we are testing out for the upcoming season. It uses the AndyMark sprocket bolt pattern. The material used for this wheel is HDPE and we are going to make a 7068 aluminum copy of this. The software used for this wheel is Solidworks and MasterCAM. SO what do you guys think?

R.C. 21-11-2008 23:13
Re: 4 inch Wheel of Doom
 



added pics!

sanddrag 22-11-2008 02:15
Re: 4 inch Wheel of Doom
 
Why are you considering making it out of 7068? That would be rather expensive. Is there some reason 6061 won't suffice?

Cory 22-11-2008 02:23
Re: 4 inch Wheel of Doom
 
7068 is a waste of money. I'd hate to even think about how much it'd cost for 4+" round, or 4+" plate even.

R.C. 22-11-2008 03:41
Re: 4 inch Wheel of Doom
 
Quote:
Originally Posted by Cory (Post 776850)
7068 is a waste of money. I'd hate to even think about how much it'd cost for 4+" round, or 4+" plate even.
Last year a company in madera went from using aluminum to titanium. So they gave us 20 6ft. of 2x2 and 1x2 aluminum and all the rod stock they had. That inlcuded 3030, 6061, 2024 and 7068. So we are using it since itz free. No other reason guys. :yikes:

IKE 22-11-2008 09:42
Re: 4 inch Wheel of Doom
 
what is your tractive surface plan? Lots of other custom wheels have a lip on the rim for adding lateral support to rough top. What are your plans?

artdutra04 22-11-2008 14:25
Re: 4 inch Wheel of Doom
 
Quote:
Originally Posted by rc_cola1323 (Post 776854)
Last year a company in madera went from using aluminum to titanium. So they gave us 20 6ft. of 2x2 and 1x2 aluminum and all the rod stock they had. That inlcuded 3030, 6061, 2024 and 7068. So we are using it since itz free. No other reason guys. :yikes:
If that was the case, personally I'd sell almost all of the 7068 and use that money to buy 6061 (or 5052*).

* For sheet metal applications.

Vikesrock 22-11-2008 16:32
Re: 4 inch Wheel of Doom
 
Quote:
Originally Posted by rc_cola1323 (Post 776854)
Last year a company in madera went from using aluminum to titanium. So they gave us 20 6ft. of 2x2 and 1x2 aluminum and all the rod stock they had. That inlcuded 3030, 6061, 2024 and 7068. So we are using it since itz free. No other reason guys. :yikes:
It may be free in terms of what you are paying, but it does still count against your BOM budget. I don't know if your team usually comes close to spending that much on the robot each year or not (my team hasn't been very close yet) but it is something to keep in mind.

R.C. 22-11-2008 19:17
Re: 4 inch Wheel of Doom
 
Quote:
Originally Posted by Vikesrock (Post 776897)
It may be free in terms of what you are paying, but it does still count against your BOM budget. I don't know if your team usually comes close to spending that much on the robot each year or not (my team hasn't been very close yet) but it is something to keep in mind.
We are usually under the BOM budget, btw Art that is a good idea.

CraigHickman 22-11-2008 19:32
Re: 4 inch Wheel of Doom
 
Out of curiosity, why would you even go with aluminum if you have that much material on the wheel? Aluminum is much stronger than teams give it credit for, especially when used in circles for a wheel-type application. You could easily take out about half that material and still be plenty strong.

R.C. 22-11-2008 20:09
Re: 4 inch Wheel of Doom
 
Quote:
Originally Posted by Speedfiend (Post 776926)
Out of curiosity, why would you even go with aluminum if you have that much material on the wheel? Aluminum is much stronger than teams give it credit for, especially when used in circles for a wheel-type application. You could easily take out about half that material and still be plenty strong.
Really, right now i have in the middle a quarter of an inch and on each side a 1/8 face extra on each side, how much more do you wanna lose??

CraigHickman 22-11-2008 20:14
Re: 4 inch Wheel of Doom
 
Quote:
Originally Posted by rc_cola1323 (Post 776936)
Really, right now i have in the middle a quarter of an inch and on each side a 1/8 face extra on each side, how much more do you wanna lose??
Looking through CD media, there's a few examples. For example, one team's wheel that I saw had an enormous amount of material taken out of it. I'm sure you could PM the creator and find out how the wheel performed.

Akash Rastogi 22-11-2008 22:27
Re: 4 inch Wheel of Doom
 
[jk] Don't set your sight on a new wheel design just yet rc, as Bill said. Knowing Dave, the robot this year won't even require wheels ;) [/jk]

CraigHickman 22-11-2008 22:43
Re: 4 inch Wheel of Doom
 
Quote:
Originally Posted by lilstogi11 (Post 776971)
[jk] Don't set your sight on a new wheel design just yet rc, as Bill said. Knowing Dave, the robot this year won't even require wheels ;) [/jk]
I could honestly see stairs (or at least ramps) coming back into play. It's been far too long with a smooth, uneventful flat playing surface.

R.C. 22-11-2008 22:59
Re: 4 inch Wheel of Doom
 
Lightbulb, pnuematic casters.


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