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jonboede(at)hotmail.com
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 Posted: Mon Oct 22, 2007 6:09 pm Post subject: pneumatic abrasotherapy |
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I have some old QSF-2A valves from my gear and flaps and I thought I'd
rehabilitate them.
Ha. Ha ha ha. hahahahaha
So I sat down with a mirror (for its flatness) and sand and emery paper
running from 230 grit all the way up to 1500.
By hand I polished the internal surfaces of both items to an absolutely
MIRROR finish. As a final step I used metal polish on linen paper.
I worked up a little test setup with a scuba bottle and regulator.
Still leaks. It holds to about 60 or 70 psi and then hisses. At 200-300
psi it hisses like crazy.
I spent HOURS doing this. It's now a matter of HONOR. 
Any suggestions? As far as I can tell, the two surfaces are flawlessly flat
(well, as far as I can tell) to nearly the microscopic level. I even put
a few drops of mineral oil to see if that helped. Nope.
I can't let this stoopid (yes, with Two O's) thing beat me... help!
Jon
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ronwasson
Joined: 05 Sep 2007
Posts: 30
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| Posted: Mon Oct 22, 2007 7:21 pm Post subject: pneumatic abrasotherapy |
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Get new ones and save your time for parts can't be found. I have been
thru this many times with old cars. If a new part is around it is
always cheaper in the long run.
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Joe Enzminger
Joined: 06 Feb 2006
Posts: 26
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| Posted: Mon Oct 22, 2007 8:00 pm Post subject: Re: pneumatic abrasotherapy |
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I'm no expert, Jon, but you [i]might[/i] have too much time on your hands.
Joe
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wlannon(at)persona.ca
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| Posted: Mon Oct 22, 2007 8:32 pm Post subject: pneumatic abrasotherapy |
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Jon;
These surfaces must be "flawlessly flat". The only possible way to achieve
that by hand is with a precision lapping table, fine lapping compound and an
understanding of lapping procedures.
A mirror, for this purpose, is not flat. Paper backed abrasive sheet, even
the best 3M wet-or- dry, is not suitable. Sand and emery paper ( I am sure
you meant wet-or dry) is pretty much guaranteed to destroy the surface.
If you have access to a very good machine shop you could have them re-ground
and lapped but I expect it would be expensive.
Cheers;
Walt
---
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brian-1927(at)lloyd.com
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| Posted: Mon Oct 22, 2007 8:41 pm Post subject: pneumatic abrasotherapy |
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On Oct 22, 2007, at 7:09 PM, Jon Boede wrote:
| Quote: | I spent HOURS doing this. It's now a matter of HONOR.
Any suggestions? As far as I can tell, the two surfaces are
flawlessly flat (well, as far as I can tell) to nearly the
microscopic level. I even put a few drops of mineral oil to see
if that helped. Nope.
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Once there is enough wear the clearances go up so that the o-ring can
squirm out of the way rather than stay where it is supposed to. You
can win this one unless you weld it up and machine it down again.
Yeah, like you are going to do that.
--
Brian Lloyd 3191 Western Drive
brian HYPHEN 1927 AT lloyd DOT com Cameron Park, CA 95682
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
— Antoine de Saint-Exupéry
PGP key ID: 12095C52A32A1B6C
PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C
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cpayne(at)joimail.com
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| Posted: Tue Oct 23, 2007 2:43 am Post subject: pneumatic abrasotherapy |
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Back in bad old days when such parts were hard to find, we had those surfaces nickel plated locally to build them back up a bit. Helped with corrosion too.
Craig Payne
cpayne(at)joimail.com (cpayne(at)joimail.com)
[quote][b]
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