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Unread 09-12-2004, 23:44
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D.Fahringer D.Fahringer is offline
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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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