Making urethane?
just curious, anyone ever tried making their own thane for whhels and bushings?
if you have, howd it work out?
if you have, howd it work out?
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Replies to This Discussion
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Premium MemberPermalink Reply by Fitz on -
"uh dude" what, I gave you a compliment. Sheesh!
Anyways, yeah I had to design in injection mould for a urethane valve on a conrete truck a few years ago. It was all new to me back then too (plastic injection is my niche), but the moulders requirement was a vacuum cavity. They also use the same method for liquid injected silicone which I've had to do also.
On another note, Tim Dawe (Coretech/Cockroach Wheels) is the guru in Aus for urethane wheels. He used to create the formulas himself for the urethane compounds. I don't know if he's in business anymore though. It's sad when a wealth of knowledge and experience just fades away.
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Premium MemberPermalink Reply by The Dave on -
I read it as slightly condescending, but text on the internet will do that to ya. Group hug!
I notice the Freerides I just got have a lot of porosity on what looks to be the upper mould face (inside lip). I assume Retro would be using a vacuum mould. The PU they used must offgas pretty heavily if there's still that much entrapped air when they set. It's always a pain to get the balance right - too low a vacuum and you won't get the air out, too high and you can make it gas up like mad.
Was I right about the core setting issue? I wasn't quite sure from what you wrote.
Fitz said:"uh dude" what, I gave you a compliment. Sheesh!
Anyways, yeah I had to design in injection mould for a urethane valve on a conrete truck a few years ago. It was all new to me back then too (plastic injection is my niche), but the moulders requirement was a vacuum cavity. They also use the same method for liquid injected silicone which I've had to do also.
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Premium MemberPermalink Reply by Fitz on -
Is cool Dave.
I know your question is directed to Phil, but I can't resist on this one.
Alloy hub needs a mechanical bond to hold the thane tyre to the hub otherwise you get a really scary delam at speed.
Tim Dawe patented the Coretch design by creating compatible compounds for both the hub and tyre.
He mould a 95D uthethane core, turned it concentric to the bearing seats (which also cleaned the skin ready for remoulding) then set the core into the mould ready to pour the tyre in a softer 75A to 85A duro.
Because the compounds were compatible they bonded like $h!t to shagpile. He then turned the contact patch to make it concentric and made one of the best designed wheels ever.
Don't quote me but I think most premium wheels these days like Abec11 and seismic etc are still hand poured hence the high porosity.
The only company to go all out were Kryptonic with vac moulded wheels and bushes, however I suspect S9 do it to mass produce their intermediate range.
The hand poured ones need to have their inside lip machined off because this is the upper part of the mould where the bubbles rise to. The less presentable face. Check out your zigzags etc.
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Permalink Reply by Phill C on
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In roller wheels most have removable hubs held in with a clip. This is why he's been making them this way. He's kept them straight forward whilst he's been building up his business. He can keep the price down for his customers by re-using the alloy hubs where as cast he cant.
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Premium MemberPermalink Reply by DA BEAR on -
Phil,
I understand making "odd" super soft, (they are so soft i've tried them) bushings like Richie does,
but why is your mate making his own roller (i guess roller skate?) wheels,
is it for the diff size/shape/duro/ or no production ones avail?
Wayne.
Phill C said:In roller wheels most have removable hubs held in with a clip. This is why he's been making them this way. He's kept them straight forward whilst he's been building up his business. He can keep the price down for his customers by re-using the alloy hubs where as cast he cant.
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Premium MemberPermalink Reply by Grits on -
Phils neighbour makes special speed roller skating wheels that have an alloy hub which inserts through the urethane which is then held in place by a c clip on the inside (closer to the skates) of the hub. It is based on an old style of speed skating roller wheels. Most roller wheels are just made similar like a standard skate wheel, with an injection process, but these alloy core speed skating wheels are in a world of their own.
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