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Unread 09-12-2004, 20:09
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Re: pic: "Omni Grenade" Wheel

WOW........ it's the BOMB!

(finally I got to said that.... hehe)

That is a WHOLE NEW level of FIRST engineering and innovation. Congrats!!

Question: Is there an advantage in rolling clockwise vs. counter clockwise?
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Last edited by Rich Wong : 09-12-2004 at 20:13.
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Unread 09-12-2004, 20:34
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Re: pic: "Omni Grenade" Wheel

I hope that thing isn't loaded!!!! ha That thing looks great!
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Unread 09-12-2004, 20:49
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Re: pic: "Omni Grenade" Wheel

Quote:
Originally Posted by Rich Wong
WOW........ it's the BOMB!

(finally I got to said that.... hehe)

That is a WHOLE NEW level of FIRST engineering and innovation. Congrats!!

Question: Is there an advantage in rolling clockwise vs. counter clockwise?

Quote:
Question: Is there an advantage in rolling clockwise vs. counter clockwise?

Yes, I think the wheel would climb up 2X4's and steps better with the roller big end leading...that is viewed from the side, looking at the roller in contact with the ground, the big end of the roller is to the left when the wheel is turning clockwise. That side is so beefy you couldn't hurt it!

It is amazing to me how much less work this would be to make than our previous omni wheels from 2001 to 2002. Those wheels were student machined except for the rollers and axles. This wheel could be totally machined, except for the waterjet work, by students and the rollers cast
using the mold, add some off the shelf bolts...done!


Quote:

"look kind of like mecanum wheels":

Aren't Mecanum omni wheels the ones with angled axles? Ours are inline with the wheel. Those Mecanum type omnis are cool too!

We can provide all details on this design if desired,

Thanks to all!!!

Dave Fahringer
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Unread 09-12-2004, 21:06
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Re: pic: "Omni Grenade" Wheel

Here is a good picture of some mecanum wheels...
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Unread 09-12-2004, 22:25
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Re: pic: "Omni Grenade" Wheel

Hmmm...
Everything I've heard makes me think these wheels are being mass produced.

Umm.. "Not a Team 122 project"
Interesting...

Dare I speculate? Will you be selling these?

-JV
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Unread 09-12-2004, 22:40
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Re: pic: "Omni Grenade" Wheel

I was wondering that, too. If the price is right, there is at least one team that is in the market.
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Unread 09-12-2004, 23:12
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Re: pic: "Omni Grenade" Wheel

i ment those rolers look strikingly similiar to my mecanum wheel rolers shown attached,

Ps: this is also not a team 179 project this wheel's OD is 2" it's for my oun project
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Unread 09-12-2004, 23:13
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Re: pic: "Omni Grenade" Wheel

Quote:
Originally Posted by Max Lobovsky
I was wondering that, too. If the price is right, there is at least one team that is in the market.



John and Matt,


Ha Ha! Thats a good one! I would love to get the procedure out to make it possible, I don't know if it is possible to have NASA recieve Fabrication hours to produce the rollers and frames for FIRST teams use...as a kit or finished....

I could (I think) release the solid models of the mold, and the DXF files for the waterjetted frame...and instructions, then any team could make the mold for the rollers and get the frames made, I am not sure if I could.

Sam is making a Powerpoint of this project for the first of three presentations for his NASA mentorship. There is no shortage of pics documenting the construction of the Omni Grenade!

If left to me to decide...I would share it freely. I can find out about this subject and anyone with prior experience can respond with advice.



Dave
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Unread 09-12-2004, 23:26
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Re: pic: "Omni Grenade" Wheel

I know nothing about molding polyurethane. Can you give me some idea of whats involved in making the mold and molding the rollers? Are there companies that will do small runs of molded parts like these? Do any teams have the proper materials.

If I can figure out how to get a hold of some of these rollers, I'm pretty sure we can get some waterjetting services donated to us and this may be possible for my team.
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Unread 09-12-2004, 23:44
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Re: pic: "Omni Grenade" Wheel

Quote:
Originally Posted by Max Lobovsky
I know nothing about molding polyurethane. Can you give me some idea of whats involved in making the mold and molding the rollers? Are there companies that will do small runs of molded parts like these? Do any teams have the proper materials.

If I can figure out how to get a hold of some of these rollers, I'm pretty sure we can get some waterjetting services donated to us and this may be possible for my team.
The casting is easy but you have to have the mold treated with a spray on release agent (like pam for plastic) every run so nothing sticks, you mix the resin and hardener in a dixie cup and pour it in the mold to the top of the brass sleeve then stop and pour the remainder into the syringe then after your helper has placed the top of the mold on place the syringe into one of the 2 holes on the top of the mold then squirt the urethane into the mold and the excess will pop out of the other hole....hold the mold still until it solidifies.
The rollers you see were made of urethane that had a VERY fast cure time...about 2.5 minutes! you would want to use a resin that is slower like 15 minutes. Do you want to see the mold?


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Unread 09-12-2004, 23:54
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Re: pic: "Omni Grenade" Wheel

I am definitely interested an any CAD files you have available. If you can "publish" them - and post to the white papers it would be greatly appreciated!

GREAT looking wheels!!
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Unread 10-12-2004, 09:37
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Re: pic: "Omni Grenade" Wheel

Quote:
Originally Posted by Stu Bloom
I am definitely interested an any CAD files you have available. If you can "publish" them - and post to the white papers it would be greatly appreciated!

GREAT looking wheels!!


Thanks, I will get the files together, and zip them up.

Here is the Mold and drill fixture used...the brass sleeve (not shown) fits on the center pins. The drill fixture assures a good hole location every time!
The holes were finished with a flat bottom before tapping. The 5/16-18 tap was modified to get thread all the way to the bottom. The bolts were faced on the ends and completely bottom out in the hole.
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Unread 10-12-2004, 19:54
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Re: pic: "Omni Grenade" Wheel

looks like a good idea. but what will happen if you are forced into a pushing match? those wheels look like they will turn like no other but whats the coefficient of friction? turning isnt the only thing that you have to look out for.
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Unread 10-12-2004, 20:22
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Re: pic: "Omni Grenade" Wheel

Quote:
Originally Posted by artic_raven
looks like a good idea. but what will happen if you are forced into a pushing match? those wheels look like they will turn like no other but whats the coefficient of friction? turning isnt the only thing that you have to look out for.
They aren't using them for a FIRST project. And rubber has a pretty high coefficient of friction... you're going to have a problem with durability though, more likely.
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Unread 10-12-2004, 20:55
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Re: pic: "Omni Grenade" Wheel

Its "soft polyurethane", not rubber, if I'm not mistaken. Soft or not, polyurethane definitley is not as good as some nice rubber treads. I wonder if a finer tread pattern, rubber coating, or a different material can be used to make the rollers.
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