1" 1/4 scale Napoleon Barrel drawings - Graybeard Outdoors
 
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post #1 of 10 (permalink) Old 09-09-2019, 09:00 PM Thread Starter
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Question 1" 1/4 scale Napoleon Barrel drawings

If I were to have a barrel machined here in Australia from solid bar stock in mild steel or brass would the drawings from the old thread below be correct?

https://www.go2gbo.com/forums/88-bla...-napoleon.html

Mark

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post #2 of 10 (permalink) Old 09-10-2019, 12:27 AM
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Yes those are the correct drawings.

Read the entire thread, the is change in bore diameter.

If you do this post step by step pictures of your build.

The easy part will be be the barrel,the carriage will be the hardest.
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post #3 of 10 (permalink) Old 09-11-2019, 10:58 PM Thread Starter
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Just to confirm.....

This barrel is a 25% size replica.

Also wondering what the internal hidden trunnion dimension and depth is?

Thanks.

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post #4 of 10 (permalink) Old 09-12-2019, 09:03 AM
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Quote:
Originally Posted by whytey View Post
Just to confirm.....

This barrel is a 25% size replica.

Also wondering what the internal hidden trunnion dimension and depth is?

Thanks.
I believe the actual scale on that drawing is 27%. Since the actual Napoleon did not have barrel wall thickness equal to the caliber, as is the safety standard we recommend, I scaled from the bore. We wanted an Inch bore gun. So I scaled from a 3 inches diameter over the breech and it came out to 27%. Read the entire thread for that detail.

The original Napoleon was a cast gun, the trunnions were integral. I do not know how Mike makes his trunnions and attaches them. It does appear he makes a recess in the barrel and makes two separate trunnions.


Photo courtesy Mike Elledge

You can see center mark and the two step trunnion- a rimbase that goes in the barrel and the trunnion.



Here is one way to attach trunnions.



As with most things this is just one way. This from a William Green Drawing of a small scale gun so don't use the dimensions for your gun. I used this method to attach the trunnions on my Inch model of the 42 PDR that was on the USS Cairo.



I made the rimbases interference fit. To turn them in place I used a rifle barrel wrench and a lot of muscle. I shot the gun a number of times. I went to a cannon shot in Northern California and when my gun was inspected one of the trunnion was loose and bent. I was required, if i wished to shoot, to have the trunnions welded in place.

Others will share their method of attachment to give you additional ideas. We have had a lot of discussion on this subject.

A good way to search our board is with this search parameter:

Code:
site:www.go2gbo.com/forums trunnion
Copy everything in side the code box above and paste it into the search window on google. Then search. If you want to find something else just change the search word, like change trunnion above to Napoleon and you will get all posts on Graybeard on Napoleon. That trunnion search by the way has a lot of good hits for you to look at.

Last edited by double d; 09-12-2019 at 09:05 AM.
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post #5 of 10 (permalink) Old 09-12-2019, 06:00 PM Thread Starter
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Thanks a bundle, double d.

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Last edited by whytey; 09-12-2019 at 06:50 PM.
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post #6 of 10 (permalink) Old 09-12-2019, 06:49 PM Thread Starter
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So..... With the barrel being 27%, surely that would make the 1/4 scale carriage an actual 27%?

I have to get a copy of the AOP No.2 carriage drawings and do the math.

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post #7 of 10 (permalink) Old 09-13-2019, 07:58 AM
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Zulu will have to comment on what scale he used for the carriage.
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post #8 of 10 (permalink) Old 09-13-2019, 09:40 AM
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Quote:
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Zulu will have to comment on what scale he used for the carriage.



27% of a #2 carriage.
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post #9 of 10 (permalink) Old 09-13-2019, 09:18 PM
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When I made my my 1841 6-pounder to fit one of my existing 25% Napolean carriages, I scaled it 29%. Fits like the carriage was made for it, and not the other way around. Odd scales are a thing.

My 1/3 scale Coehorn that I'm currently working on (well trying to) is actually 34% because all the major dimensions worked out better than 33%.

I don't often bare my soul, it's ugly and tends to frighten people.

Last edited by Terry C.; 09-13-2019 at 09:21 PM.
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post #10 of 10 (permalink) Old 10-07-2019, 02:03 PM
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Looking at the drawing for the trunnions, that #10 screw is way to small.Even with an interference fit of the trunnion base , I have used both 3/8 and 5/16 threads, no loosening after 8 years. I used a steel ring countersunk into both barrel and trunnion, and a SHCS bolt to hold it together.
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