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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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 Posted: Sun Apr 15, 2007 3:47 pm Post subject: Locktite on spinner bolt. |
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Funny thing if you handle a stainless exhaust bare handed the prints will
blue forever when the exhaust heats up.
Noel
[quote] --
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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rjdaugh
Joined: 30 Aug 2006
Posts: 195
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| Posted: Mon Apr 16, 2007 6:16 am Post subject: Locktite on spinner bolt. |
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Thanks Rick and Kurt.
Something is going on. Wish I understood it better. (And glad I took Skystar’s advice during build!)
Randy
Do not archive.
.
From: owner-kitfox-list-server(at)matronics.com [mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of Mdkitfox(at)aol.com
Sent: Sunday, April 15, 2007 2:57 PM
To: kitfox-list(at)matronics.com
Subject: Re: Locktite on spinner bolt.
In a message dated 4/14/2007 11:48:20 P.M. Eastern Daylight Time, rjdaugh(at)rapidnet.com writes:
| Quote: |
Hey, there must be a metallurgist out there. I always thought it was that the graphite scratched the oxide surface off of the aluminum and left a spot for corrosion. But why would that be worse than scratching the oxide off with a scotch brite pad? Cause water or salt can displace the graphite? I really don’t know.
Or is it just an old wives tale? |
Randy,
It's not a wives tale. I was only an aero engineer at Kennedy Space Center, not a metallurgist, but I saw a mechanic draw a line with a pencil on a piece of aluminum used on the Saturn V. I brought this to his attention and he laughed and gave me a rough time since I was just out of school and the new kid on the block.
Long story short, for a $5 bet, we put 2 identical pieces of aluminum in 2 pull testers. One was scribed with a pencil line the other wasn't. During the pull, the piece scribed with the pencil cracked right along the drawn line and the other piece did not break. Could it have been luck? I don't think so, I had performed that same test in college and it did the same thing more than once.
The carbon in the lead or graphite sets up stress corrosion in the aluminum and when you place the part under stress it doesn't take long for the crack to occur. It will even follow gentle curves. The humidity in the air and especially in a salty environment like the beach will cause this corrosion to accelerate quickly. Just leave a piece of painted chrome molly steel outside for a day and see how quickly corrosion attacks it.
Rick
Series V Speedster - N39RW, Serial Number 1
DO NOT ARCHIVE
See what's free at AOL.com.
| Quote: | | http://www.matronics.com/Navigator?Kitfox-List |
01234
[quote][b]
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Randy
Kitfox 5/7 912S
Black Hills, South Dakota |
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Michel
Joined: 10 Jan 2006
Posts: 966
Location: Norway
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| Posted: Mon Apr 16, 2007 12:03 pm Post subject: Locktite on spinner bolt. |
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Thanks guys and sorry for a bit late answer. No, my spinner is
glassfiber so I don't have a problem with lead/graphite pencil on
aluminium.
Lynn, you have also a Jabiru and the same spinner as me. Putting it on
a lathe? Could be an idea but my off-center motion is much greater
than what I could get from the thickness of the glassfiber. Beside that
.. a lather! Gosh, you must be a rich (and ingenious) man! I hardly
have anything more than a Swiss knife to work on my plane. ... okay, I
exaggerate a bit here but ... a lathe? And knowing how to use it?
Listen, did you also invented the wheel, or what? ... just kidding!
Sunny weather in Norway brings the silliness out of me! 
Cheers,
Michel
do not archive
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Kitfox 3 - Jabiru 2200 |
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wliles(at)bayou.com
Guest
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| Posted: Mon Apr 16, 2007 6:51 pm Post subject: Locktite on spinner bolt. |
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Graphite and aluminum in the presence of water form an electrolytic
cell. The corrosion produced is the same type as is encountered with
aluminum and iron, or iron and zinc, Galvanic with aluminum the looser.
When the first carbon fiber bicycles became available the carbon tubes
were frequently bonded in aluminum brackets where the tubes clustered at
the bottom bracket, head set and rear wheel brackets. There were
numerous, occassionally spectacular failures of these bikes due to
galvanic corrosion.
Jerry Liles
Randy Daughenbaugh wrote:
| Quote: | Thanks Rick and Kurt.
Something is going on. Wish I understood it better. (And glad I took
Skystar’s advice during build!)
Randy
Do not archive.
.
------------------------------------------------------------------------
From: owner-kitfox-list-server(at)matronics.com
[mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of
Mdkitfox(at)aol.com
Sent: Sunday, April 15, 2007 2:57 PM
To: kitfox-list(at)matronics.com
Subject: Re: Locktite on spinner bolt.
In a message dated 4/14/2007 11:48:20 P.M. Eastern Daylight Time,
rjdaugh(at)rapidnet.com writes:
Hey, there must be a metallurgist out there. I always thought it
was that the graphite scratched the oxide surface off of the
aluminum and left a spot for corrosion. But why would that be
worse than scratching the oxide off with a scotch brite pad? Cause
water or salt can displace the graphite? I really don’t know.
Or is it just an old wives tale?
Randy,
It's not a wives tale. I was only an aero engineer at Kennedy Space
Center, not a metallurgist, but I saw a mechanic draw a line with a
pencil on a piece of aluminum used on the Saturn V. I brought this to
his attention and he laughed and gave me a rough time since I was just
out of school and the new kid on the block.
Long story short, for a $5 bet, we put 2 identical pieces of aluminum
in 2 pull testers. One was scribed with a pencil line the other
wasn't. During the pull, the piece scribed with the pencil cracked
right along the drawn line and the other piece did not break. Could it
have been luck? I don't think so, I had performed that same test in
college and it did the same thing more than once.
The carbon in the lead or graphite sets up stress corrosion in the
aluminum and when you place the part under stress it doesn't take long
for the crack to occur. It will even follow gentle curves. The
humidity in the air and especially in a salty environment like the
beach will cause this corrosion to accelerate quickly. Just leave a
piece of painted chrome molly steel outside for a day and see how
quickly corrosion attacks it.
Rick
Series V Speedster - N39RW, Serial Number 1
DO NOT ARCHIVE
====================
|
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rjdaugh
Joined: 30 Aug 2006
Posts: 195
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| Posted: Tue Apr 17, 2007 6:37 am Post subject: Locktite on spinner bolt. |
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Makes sense!
Thanks Jerry.
Randy
Do not archive.
.
--
| | - The Matronics Kitfox-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
Randy
Kitfox 5/7 912S
Black Hills, South Dakota |
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Tue Apr 17, 2007 3:24 pm Post subject: Locktite on spinner bolt. |
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Hi Michel-
I've had that lathe since about 1963, I think, and it has traveled
from Michigan to California (about 2300 miles) in a car, and traveled
back from there in a trailer. I once loaned it to a guy here in
Michigan, while I moved to California. He enjoyed the use of it for
about 2 years, until I got settled into a house with a garage where I
could use it again, and he delivered it to me out there, while he
made a trip to California. I then left California to move back here
to Michigan, and had to leave it out there, only to return to
California a few years later, to bring it home in a trailer....WHEW!
But I digress...
The amount of out-of-round that I had was partly due to the bulkhead,
as they call the mounting plate, and partly due to the irregular
surface of the inside of the spinner itself. I didn't do anything to
the inside of the spinner. Correcting that would have taken somebody
with a lot more smarts than what I have just to be able to figure a
way to hold the slippery, angled thing in the first place! Perhaps a
vacuum device could be built that would hold the spinner so that it
could be turned true inside.
Yes, I did invent the wheel...it had four sides...
Better get in out of the sun, Michel. : )
Lynn
do not archive
On Apr 16, 2007, at 4:01 PM, Michel Verheughe wrote:
| Quote: |
Thanks guys and sorry for a bit late answer. No, my spinner is
glassfiber so I don't have a problem with lead/graphite pencil on
aluminium.
Lynn, you have also a Jabiru and the same spinner as me. Putting it
on a lathe? Could be an idea but my off-center motion is much
greater than what I could get from the thickness of the glassfiber.
Beside that ... a lather! Gosh, you must be a rich (and ingenious)
man! I hardly have anything more than a Swiss knife to work on my
plane. ... okay, I exaggerate a bit here but ... a lathe? And
knowing how to use it? Listen, did you also invented the wheel, or
what? ... just kidding! Sunny weather in Norway brings the
silliness out of me!
Cheers,
Michel
do not archive
|
| | - The Matronics Kitfox-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Kitfox-List |
|
_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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