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No question riveted would see the highest point load levels. Anyway, Cast would/should work. It would need to be balanced the same as any other. Billet has the potential of being fairly pricey.
I'm assuming that aluminum would be the prefered [I'll have to look up which alloy is best for something with high cyclical loads. Are you thinking you'd want one w/ a top ring or just a open face fan unit [like a turbo impeller]?
If we go cast, it is possible to put in a top ring which would help hold the blades at their top/outter edge w/ a billet unit it would be 'possible'
but very costly to machine in the top ring.
I'm not back to the office until Tuesday but I can get the details ready to get pricing together.
Jarrett Johnson
www.innovention-tech.com ----- Original Message -----
From: Ernest Christley <echristley@nc.rr.com>
Date: Friday, May 20, 2011 6:43 pm
Subject: [FlyRotary] Re: Blower experiment: FAIL
On 05/20/2011 07:35 PM, H & J Johnson wrote:
> So your thinking that the centrifugal forces are what sheared the rivets? It's pretty crazy how high the forces spikes could be from an unblanced fan. I've not see one yet that was just built and installed w/out being balanced and lived for any period of time. That kind of stuff fails spectacularly, once it starts to go you couldn't stop it fast enough to stop it from exploding.
Can't argue one way or the other. All I know is that it came apart completely, and I wouldn't trust another constructed that way to last any longer.
> As far as cnc'ing one, sure that can be arranged. Are we talking from billet or a casting or..? Material?
Would a cast object be able to hold together? I was thinking that with a CNC, a machined billet one-off would be the easiest route.
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