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Naval History in the years 1890-1920
 
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Ironman



Joined: 08 Mar 2010
Posts: 104
Location: Washington

PostPosted: Wed Apr 07, 2010 11:38 pm    Post subject: Reply with quote

build delayed

Last edited by Ironman on Tue Jun 08, 2010 3:34 pm; edited 1 time in total
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Jefgte



Joined: 27 Feb 2007
Posts: 65
Location: France

PostPosted: Thu Apr 08, 2010 2:50 am    Post subject: Reply with quote

Nice & interresting project.

A French Guy is building the Coastal BB Requin in steel too.

If you want exchange building infos...

http://forummarine.forumactif.com/vos-maquettes-et-etudes-f48/garde-cotes-cuirasse-requin-t4763.htm


Jef
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Ironman



Joined: 08 Mar 2010
Posts: 104
Location: Washington

PostPosted: Thu Apr 08, 2010 5:19 pm    Post subject: Reply with quote

build delayed

Last edited by Ironman on Tue Jun 08, 2010 3:35 pm; edited 1 time in total
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Ironman



Joined: 08 Mar 2010
Posts: 104
Location: Washington

PostPosted: Sun Apr 11, 2010 9:49 pm    Post subject: Reply with quote

build delayed

Last edited by Ironman on Tue Jun 08, 2010 3:35 pm; edited 2 times in total
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Iain



Joined: 26 Sep 2006
Posts: 149

PostPosted: Mon Apr 12, 2010 9:39 am    Post subject: Reply with quote

I've got your drawings and have started working on them. I'll try to get them done by the end of the week.
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John H. Dulaney
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Iain



Joined: 26 Sep 2006
Posts: 149

PostPosted: Mon Apr 12, 2010 1:47 pm    Post subject: Reply with quote

On second thought, it will take longer than a week. At least this time around I have better data available than when I drew the North Carolina's hull.

If you download Autodesk's DWGTrueview, I can set up layouts so that you can just print individual drawings as needed AND you can see my 3d hull.
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John H. Dulaney
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Ironman



Joined: 08 Mar 2010
Posts: 104
Location: Washington

PostPosted: Mon Apr 12, 2010 4:33 pm    Post subject: Reply with quote

build delayed

Last edited by Ironman on Tue Jun 08, 2010 3:36 pm; edited 1 time in total
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Ironman



Joined: 08 Mar 2010
Posts: 104
Location: Washington

PostPosted: Mon Apr 12, 2010 11:18 pm    Post subject: Reply with quote

build delayed

Last edited by Ironman on Tue Jun 08, 2010 3:36 pm; edited 1 time in total
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Iain



Joined: 26 Sep 2006
Posts: 149

PostPosted: Tue Apr 13, 2010 10:30 am    Post subject: Reply with quote

You may want to hold off on ribs until I get the drawings done. It looks like I'll be doing some fairing to get this thing perfect, which may lead to some of your ribs being slightly off. I'm basically lofting your model for you to correct all the drafting errors.

The other thing is that you stated on your drawing that if I made the drawings a certain size, they would match what you already have. Would you rather have a match to what you've got, or something that is as close to scale as possible?
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John H. Dulaney
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Ironman



Joined: 08 Mar 2010
Posts: 104
Location: Washington

PostPosted: Tue Apr 13, 2010 3:22 pm    Post subject: Reply with quote

build delayed

Last edited by Ironman on Tue Jun 08, 2010 3:37 pm; edited 1 time in total
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Iain



Joined: 26 Sep 2006
Posts: 149

PostPosted: Wed Apr 14, 2010 2:03 pm    Post subject: Reply with quote

The errors of which I speak come from a plethora of sources: hand drafting, age, warpping from sitting rolled up, and minor errors that creep in through the copying process.
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John H. Dulaney
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Ironman



Joined: 08 Mar 2010
Posts: 104
Location: Washington

PostPosted: Thu Apr 15, 2010 2:46 am    Post subject: Reply with quote

build delayed

Last edited by Ironman on Tue Jun 08, 2010 3:37 pm; edited 1 time in total
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Iain



Joined: 26 Sep 2006
Posts: 149

PostPosted: Thu Apr 15, 2010 12:57 pm    Post subject: Reply with quote

Ironman wrote:
Since I have to make ribs from scratch, I thought I'd try a different method.
I wanted uniformity so I tried forming 1/2" flat stock sheared from the 20 guage. I made a forming die by riveting three circles together. The two outers are 5 3/4" and the center is 5" This gives good support so the part wont deflect while being worked. I start by rocking the flat stock back and forth in the die until a gentle curve was established. At that point I start to use some force and work it into a tighter curve. When it starts to get where it wont yield I clamp one end in the die and start gently working it with a very small hammer while pulling down lightly on the other end. It really moves well til it gets near the 5" diameter. I think thats about maximum arc for working the metal cold.
I did find out by accident a little trick.
When tapping the piece into the die the outer edge is being "compressed" by the hammer. This is contrary to what is needed for the metal to make an arc. The inner edge needs to compress, and the outer needs to expand. So when I took the part out and flattened the "ridge", the edge expanded and the radius became a little bit tighter :)


It would seem that you are learning the art of the blacksmith a little bit as well.
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Ironman



Joined: 08 Mar 2010
Posts: 104
Location: Washington

PostPosted: Fri Apr 16, 2010 1:32 am    Post subject: Reply with quote

build delayed

Last edited by Ironman on Tue Jun 08, 2010 3:38 pm; edited 1 time in total
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Iain



Joined: 26 Sep 2006
Posts: 149

PostPosted: Fri Apr 16, 2010 12:58 pm    Post subject: Reply with quote

Well, you could go and just put in a ceiling after the fact. If you where to rivet 90 degree angles every few ribs, you could get a nice, flat surface without compromising ease of construction.
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