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801: Joggling the L's in the Rear Fuselage

 
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squiggles



Joined: 05 Oct 2006
Posts: 6

PostPosted: Thu Jul 05, 2007 6:50 am    Post subject: 801: Joggling the L's in the Rear Fuselage Reply with quote

Hello All...

As I approach the end of building( though at this pace it will still be another 2 years before I fly ) I faced with a multitude of items which I bypassed at the time, but now must be addressed.

During construction of the rear fuselage the L angles must be joggled and riveted to the skins and the extruded longerons. I didn't like the edge distances which came out from single rivets into the longerons. This was primarily the result of poor joggling. I will likely add 2 additional "squares" of L's in the rear fuselage. However, reviewing my building notes from that time I see it was hit or miss as to the quality of the joggle.

What techniques, dies, etc. have you used which assure a quality joggle everytime?

Worst case, I am just going to use an additional strip of aluminum the thickness of the longerons, placing it between the skin and the L. Thus, avoiding the joggle hassle all together.

Any help is appreciated....

Thx...
-Scott
http://www.zenithair.com/bldrlist/pm.cgi?login=squiggles&action=display&private=&


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Jaybannist(at)cs.com
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PostPosted: Thu Jul 05, 2007 8:39 am    Post subject: 801: Joggling the L's in the Rear Fuselage Reply with quote

Scott,

I made my joggling blocks from 1 1/2" x 2" hard yellow pine boards that were a part of the ZAC shipping crates. See attached photos. The offset is ~5/32" or 4mm by ~1". I placed the aluminum angle on the long block, end of angle flush with the end of the block. Align the top block with the joggle and give it a couple of sharp whacks with a mallet. Sometimes, I would clamp the vertical leg of the angle with another wood block to eliminate distortion of that leg. Questions?

Jay in Dallas

"squiggles" <squiggles(at)yahoo.com> wrote:

Quote:


Hello All...

As I approach the end of building( though at this pace it will still be another 2 years before I fly ) I faced with a multitude of items which I bypassed at the time, but now must be addressed.

During construction of the rear fuselage the L angles must be joggled and riveted to the skins and the extruded longerons. I didn't like the edge distances which came out from single rivets into the longerons. This was primarily the result of poor joggling. I will likely add 2 additional "squares" of L's in the rear fuselage. However, reviewing my building notes from that time I see it was hit or miss as to the quality of the joggle.

What techniques, dies, etc. have you used which assure a quality joggle everytime?

Worst case, I am just going to use an additional strip of aluminum the thickness of the longerons, placing it between the skin and the L. Thus, avoiding the joggle hassle all together.

Any help is appreciated....

Thx...
-Scott
http://www.zenithair.com/bldrlist/pm.cgi?login=squiggles&action=display&private=&


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ihab.awad(at)gmail.com
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PostPosted: Thu Jul 05, 2007 8:48 am    Post subject: 801: Joggling the L's in the Rear Fuselage Reply with quote

Jay,

On 7/5/07, Jaybannist(at)cs.com <Jaybannist(at)cs.com> wrote:
Quote:
I made my joggling blocks from 1 1/2" x 2" hard yellow pine boards ...

Very nifty. Do you have a picture of the finished, joggled parts? My
own experience joggling with such a setup is that the joggle is nice
and crisp near the "break" but, towards the end of the part, the metal
progressively "relaxes" and "unjoggles".

Ihab

--
Ihab A.B. Awad, Palo Alto, CA


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Jaybannist(at)cs.com
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PostPosted: Thu Jul 05, 2007 9:29 am    Post subject: 801: Joggling the L's in the Rear Fuselage Reply with quote

Ihab,

I have attached photos of a 20mm x 20mm x .025 angle scrap that I just joggled.

Jay in Dallas
ihab.awad(at)gmail.com wrote:

Quote:


Jay,

On 7/5/07, Jaybannist(at)cs.com <Jaybannist(at)cs.com> wrote:
> I made my joggling blocks from 1 1/2" x 2" hard yellow pine boards ...

Very nifty. Do you have a picture of the finished, joggled parts? My
own experience joggling with such a setup is that the joggle is nice
and crisp near the "break" but, towards the end of the part, the metal
progressively "relaxes" and "unjoggles".

Ihab

--
Ihab A.B. Awad, Palo Alto, CA



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PostPosted: Thu Jul 05, 2007 10:07 am    Post subject: 801: Joggling the L's in the Rear Fuselage Reply with quote

Thank you! Somehow looks a lot better than my results. I'll try your
jig idea! -- I

On 7/5/07, Jaybannist(at)cs.com <Jaybannist(at)cs.com> wrote:
Quote:
Ihab,

I have attached photos of a 20mm x 20mm x .025 angle scrap that I just joggled.

Jay in Dallas
ihab.awad(at)gmail.com wrote:

>
>
>Jay,
>
>On 7/5/07, Jaybannist(at)cs.com <Jaybannist(at)cs.com> wrote:
>> I made my joggling blocks from 1 1/2" x 2" hard yellow pine boards ...
>
>Very nifty. Do you have a picture of the finished, joggled parts? My
>own experience joggling with such a setup is that the joggle is nice
>and crisp near the "break" but, towards the end of the part, the metal
>progressively "relaxes" and "unjoggles".
>
>Ihab
>
>--
>Ihab A.B. Awad, Palo Alto, CA
>
>
>
>
>


--
Ihab A.B. Awad, Palo Alto, CA


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planecrazydld(at)yahoo.co
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PostPosted: Thu Jul 05, 2007 12:04 pm    Post subject: 801: Joggling the L's in the Rear Fuselage Reply with quote

joggle bars or joggle blocks work very well for formed sheet angles but to a lesser degree on extruded sections. We were able to use aluminum and steel joggle blocks on extruded sections back at Cessna Experimental though - make sure that the binding edges (that acturally form the departures from straight) are polished to avoid marking the extrusion - especially near the radius.

ihab.awad(at)gmail.com wrote: [quote]--> Zenith-List message posted by: ihab.awad(at)gmail.com

Thank you! Somehow looks a lot better than my results. I'll try your
jig idea! -- I

On 7/5/07, Jaybannist(at)cs.com wrote:
[quote] Ihab,

I have attached photos of a 20mm x 20mm x .025 angle scrap that I just joggled.

Jay in Dallas
ihab.awad(at)gmail.com wrote:

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dj45



Joined: 25 Jul 2006
Posts: 92
Location: Jackson MI

PostPosted: Thu Jul 05, 2007 5:36 pm    Post subject: Re: 801: Joggling the L's in the Rear Fuselage Reply with quote

Just make a form from a oak 4X4 and use a rubber mallet and they will turn out just fine.

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