Author: "Steven L. Hild" <L-of-Louavul@...> Time: Sat Oct 9, 2004 1:41 pm PDT Link
Murphy and I were dimpling the firewall this morning and despite
written warnings posted on the firewall, print hanging on the wall
next to the work table and every other precaution taken, we, (I)
dimpled about 50% of the firewall from the wrong side (flush on aft
side).
If I reverse the exsisting dimples, which seems possible as evidenced
by a few that I have smacked back to the way they are supposed to be,
what would be the likelyhood of the material work hardening so as to
result in a bunch of cracking at these "double dimpled" holes soon
after the flying begins?
Or would it just be better to start over with a new firewall?
Thanks for your thoughts,
Steven L. Hild
La Vernia, TX
RV-7
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Author: "Rich" <easylivin_ak@...> Time: Sat Oct 9, 2004 10:44 pm PDT Link
I would talk with Van's before proceding .Some materials can take
repeat dimples and others cannot. They will be able to advise you.
Rich
--- In RV7and7A@yahoogroups.com, "Steven L. Hild" <L-of-
Louavul@m...> wrote:
> Murphy and I were dimpling the firewall this morning and despite
> written warnings posted on the firewall, print hanging on the wall
> next to the work table and every other precaution taken, we, (I)
> dimpled about 50% of the firewall from the wrong side (flush on
aft
> side).
>
> If I reverse the exsisting dimples, which seems possible as
evidenced
> by a few that I have smacked back to the way they are supposed to
be,
> what would be the likelyhood of the material work hardening so as
to
> result in a bunch of cracking at these "double dimpled" holes soon
> after the flying begins?
>
> Or would it just be better to start over with a new firewall?
>
> Thanks for your thoughts,
> Steven L. Hild
> La Vernia, TX
> RV-7
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Author: "Richard & Roberta Hegy" <rhegy@...> Time: Sat Oct 9, 2004 10:44 pm PDT Link
Something as important as the FW? I'd replace it. Trying to repair it later would be more work and expense than it would now.
JMHO
Roberta
----- Original Message -----
From: Steven L. Hild
To: RV7and7A@yahoogroups.com
Sent: Saturday, October 09, 2004 2:09 PM
Subject: [RV7Yahoo] Fierwall Dimples
Murphy and I were dimpling the firewall this morning and despite
written warnings posted on the firewall, print hanging on the wall
next to the work table and every other precaution taken, we, (I)
dimpled about 50% of the firewall from the wrong side (flush on aft
side).
If I reverse the exsisting dimples, which seems possible as evidenced
by a few that I have smacked back to the way they are supposed to be,
what would be the likelyhood of the material work hardening so as to
result in a bunch of cracking at these "double dimpled" holes soon
after the flying begins?
Or would it just be better to start over with a new firewall?
Thanks for your thoughts,
Steven L. Hild
La Vernia, TX
RV-7
Van's Air Force - World Wide Wing
www.vansaircraft.net
Yahoo! Groups Sponsor
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Author: "lindbergs52" <lindbergs1@...> Time: Sat Oct 9, 2004 10:50 pm PDT Link
Steven: I don't know the answer, but here is what I would do. I'd push the dimples back
the right way and look at them with a 10x magnifying glass. No cracks? I'd use the
firewall. BTW, I put my firewall together with tank sealant. It will (I hope) keep unpleasant
liquids and smells out of the cabin....and it also might reduce stress at the rivet heads and
forestall cracks. My opinion? You are OK. If Murph is still hanging around your shop slap
him around for the rest of us. Steve
--- In RV7and7A@yahoogroups.com, "Steven L. Hild" <L-of-Louavul@m...> wrote:
> Murphy and I were dimpling the firewall this morning and despite
> written warnings posted on the firewall, print hanging on the wall
> next to the work table and every other precaution taken, we, (I)
> dimpled about 50% of the firewall from the wrong side (flush on aft
> side).
>
> If I reverse the exsisting dimples, which seems possible as evidenced
> by a few that I have smacked back to the way they are supposed to be,
> what would be the likelyhood of the material work hardening so as to
> result in a bunch of cracking at these "double dimpled" holes soon
> after the flying begins?
>
> Or would it just be better to start over with a new firewall?
>
> Thanks for your thoughts,
> Steven L. Hild
> La Vernia, TX
> RV-7
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Author: LR Frey <lrogerfrey@...> Time: Sat Oct 9, 2004 10:53 pm PDT Link
Steven, Murphy and I are good buddy's. Anyway, I'd re re-dimple them in the correct way, then I'd ask an A&P or Van's for their opinion.
Larry
"Steven L. Hild" <L-of-Louavul@mindspring.com> wrote:
Murphy and I were dimpling the firewall this morning and despite
written warnings posted on the firewall, print hanging on the wall
next to the work table and every other precaution taken, we, (I)
dimpled about 50% of the firewall from the wrong side (flush on aft
side).
If I reverse the exsisting dimples, which seems possible as evidenced
by a few that I have smacked back to the way they are supposed to be,
what would be the likelyhood of the material work hardening so as to
result in a bunch of cracking at these "double dimpled" holes soon
after the flying begins?
Or would it just be better to start over with a new firewall?
Thanks for your thoughts,
Steven L. Hild
La Vernia, TX
RV-7
Van's Air Force - World Wide Wing
www.vansaircraft.net
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Author: "Bruce" <wingtime@...> Time: Mon Oct 11, 2004 4:52 pm PDT Link
Steven,
I know what your talking about here. After very carful attention to
which way my firewall was facing I some how had the dies in the c-
frame upside down. (I think Murphy switched mine without asking too)
I started whacking away when on about the 10th hole I saw what I was
doing wrong. (Maybe Murphy felt bad) I changed the dies and reversed
the offending rivets then marked them with a sharpie and finished
dimpling the firewall. I too was worried about cracks so I inspected
the marked dimples with a little old radio shack 30X iluminated
mircoscope. No cracks, in fact they looked as good as or better than
the the "correct" dimples. I knew that Vans said it was ok
to "reverse" a dimple in aluminum once (don't ask). However I wasn't
sure about stainless. So I fired them an e-mail. I was told no
problem on reversing a dimple in the firewall once.
BTW have you ever inspected a dimpled or regular hole with a 30X
microscope? Holy cow! those smooth, shinny looking deburred holes
are FAR from smooth! I have two deburring tools, one is a single
hole type the other is a three bladed job. The single hole type
produces a MUCH cleaner edge by far!
Bruce Smith
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Author: "Steven L. Hild" <L-of-Louavul@...> Time: Tue Oct 12, 2004 10:17 am PDT Link
-I wrote Van's and received an e-mail from Ken Scott saying not to
sweat it, so I am moving on!
Thanks to all that replied.
Steven L. Hild
La Vernia, TX
RV-7 FUS
-- In RV7and7A@yahoogroups.com, "Bruce" <wingtime@y...> wrote:
> Steven,
>
> I know what your talking about here. After very carful attention
to
> which way my firewall was facing I some how had the dies in the c-
> frame upside down. (I think Murphy switched mine without asking
too)
>
> I started whacking away when on about the 10th hole I saw what I
was
> doing wrong. (Maybe Murphy felt bad) I changed the dies and
reversed
> the offending rivets then marked them with a sharpie and finished
> dimpling the firewall. I too was worried about cracks so I
inspected
> the marked dimples with a little old radio shack 30X iluminated
> mircoscope. No cracks, in fact they looked as good as or better
than
> the the "correct" dimples. I knew that Vans said it was ok
> to "reverse" a dimple in aluminum once (don't ask). However I
wasn't
> sure about stainless. So I fired them an e-mail. I was told no
> problem on reversing a dimple in the firewall once.
>
> BTW have you ever inspected a dimpled or regular hole with a 30X
> microscope? Holy cow! those smooth, shinny looking deburred holes
> are FAR from smooth! I have two deburring tools, one is a single
> hole type the other is a three bladed job. The single hole type
> produces a MUCH cleaner edge by far!
> Bruce Smith
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