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Rivnuts or Anchor Nuts or Am I Nuts?

 
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nfivesl(at)yahoo.com
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PostPosted: Tue Jan 17, 2006 11:01 am    Post subject: Rivnuts or Anchor Nuts or Am I Nuts? Reply with quote

Fellow builders:

As you can see from the following photo, I haven't yet
attached my forward, top skin permanently.

http://www.cooknwithgas.com/1_17_06_Panel.jpg

The first reason is that I have a rat's nest of wires
to be tidied up. The second reason is that I want to
be able to remove it later and haven't decided how
best to do this.

I have been using rivnuts all over the place for
non-structural applications (like wire-clamps).

For those of you who are reading and have not
personally installed a rivnut and/or an anchor nut
before, here's the best photo I could find:

http://www.torquecontrol.ltd.uk/photo2.jpg
or
http://www.aircraftspruce.com/catalog/hapages/rivets/rivnuts.jpg

As opposed to an anchor nut:

http://www.aircraftspruce.com/catalog/hapages/bolts/minianchornut.jpg

So - after all that - my question is - does anybody
have a good reason why I should not install rivnuts to
hold down the top forward skin with screws? (Besides
the obvious reason that one or two may spin in the
future - I can get back there to hold them if this
happens).

Thanks in advance for any input,

Scott Laughlin
www.cooknwithgas.com

DO NOT ARCHIVE


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craig(at)craigandjean.com
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PostPosted: Tue Jan 17, 2006 11:17 am    Post subject: Rivnuts or Anchor Nuts or Am I Nuts? Reply with quote

Another possibility is Tinnerman U nuts. At least one builder use them to
attach his top, forward skin.

Look half way down this page:

http://www.aircraftspruce.com/catalog/hapages/tinnerman.php

-- Craig

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mountain4don(at)yahoo.com
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PostPosted: Tue Jan 17, 2006 11:40 am    Post subject: Rivnuts or Anchor Nuts or Am I Nuts? Reply with quote

The anchor nuts have a much larger bearing area and are much stronger, plus the rivets provide much larger torque capacity when the screw gets hard to turn in old age. And they are pretty easy to put in.

Don
601 XL, tail done, working on wings

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thilo.kind(at)gmx.net
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PostPosted: Tue Jan 17, 2006 1:41 pm    Post subject: Rivnuts or Anchor Nuts or Am I Nuts? Reply with quote

Hi Scott,

I used anchor nuts for the forward skin. Replaced all rivets with #8 (for
the side longerons) and #6 (for the firewall and IP) anchor nuts. Was a lot
of work to install all those anchor nuts, but haven't regretted it at all. I
have taken the forward skin off multiple times. And best off all: the plane
flys fine and has not fallen out of the sky.

I never used rivnuts, but heard several time, that too much torque will turn
them loose in their holes.

Best regards

Thilo Kind
CH 601 HDS
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Larry McFarland



Joined: 10 Jan 2006
Posts: 36
Location: East Moline, Illinois

PostPosted: Tue Jan 17, 2006 1:52 pm    Post subject: Rivnuts or Anchor Nuts or Am I Nuts? Reply with quote

Scott,
The Tinnerman J-nuts are far more easy to use and they are only about
$10 for a package of 50.
I sized them for 6-32 screws and purchased them from McMaster Carr.
Don't use Rivnuts or plate nuts
as they wear out and are hard to replace. I've had my forward top skin
off a dozen times and have replaced
half a dozen screws (stripped thread) and perhaps 10 J-nuts in all that
time. They never let go and you don't
find any screws loose or missing after a flight. See links

http://www.macsmachine.com/images/canopy/full/uclips.gif
http://www.macsmachine.com/images/canopy/full/xlfwdtopskin.gif
http://www.macsmachine.com/images/canopy/full/flash&rubber.gif

http://www.mcmaster.com/ (see j nuts shapes 1 and 2)

See part numbers 94809A102

Larry McFarland - 601HDS at www.macsmachine.com

Quote:

As opposed to an anchor nut:

http://www.aircraftspruce.com/catalog/hapages/bolts/minianchornut.jpg

So - after all that - my question is - does anybody have a good reason why I
should not install rivnuts to hold down the top forward skin with screws?
(Besides the obvious reason that one or two may spin in the future - I can
get back there to hold them if this happens).

Thanks in advance for any input,

Scott Laughlin
www.cooknwithgas.com

DO NOT ARCHIVE













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Larry McFarland - 601HDS - Stratus
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ggower_99(at)yahoo.com
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PostPosted: Tue Jan 17, 2006 10:03 pm    Post subject: Rivnuts or Anchor Nuts or Am I Nuts? Reply with quote

Hello Scott,

Thats the only reason, they can turn loose in the skin. I made a test for the rivnuts to prevent them to turn: A used an epoxy putty with aluminum powder and applied carefully a little in the rivnut holding area and the skin... Then pressed the rivnut. My idea is that it will have double support, the natural squeeze of the rivnut and the glue of the epoxy... has to be very the exact quantity so the epoxy will not get in the nut area. Hope I got understood... Hope it holds as welded....

The tool was to expensive to trow it away Smile

Saludos
Gary Gower

N5SL <nfivesl(at)yahoo.com> wrote:


Fellow builders:

As you can see from the following photo, I haven't yet
attached my forward, top skin permanently.

http://www.cooknwithgas.com/1_17_06_Panel.jpg

The first reason is that I have a rat's nest of wires
to be tidied up. The second reason is that I want to
be able to remove it later and haven't decided how
best to do this.

I have been using rivnuts all over the place for
non-structural applications (like wire-clamps).

For those of you who are reading and have not
personally installed a rivnut and/or an anchor nut
before, here's the best photo I could find:

http://www.torquecontrol.ltd.uk/photo2.jpg
or
http://www.aircraftspruce.com/catalog/hapages/rivets/rivnuts.jpg

As opposed to an anchor nut:

http://www.aircraftspruce.com/catalog/hapages/bolts/minianchornut.jpg

So - after all that - my question is - does anybody
have a good reason why I should not install rivnuts to
hold down the top forward skin with screws? (Besides
the obvious reason that one or two may spin in the
future - I can get back there to hold them if this
happens).

Thanks in advance for any input,

Scott Laughlin
www.cooknwithgas.com

DO NOT ARCHIVE


---------------------------------
Got holiday prints? See all the ways to get quality prints in your hands ASAP.


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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?Zenith-List
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