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Old 11-06-2012, 02:30 PM   #81
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Yeah I read that, I'm just speculating. Probably should have worded it as a question such as: Did any gunsmiths do that back in the day?
I can assure you gunsmiths certainly delved into making air guns way back before the 18th century.
The problem here is not being able to have a hands on look at it.
I can only guess by looking at the photos.
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Old 11-07-2012, 06:38 PM   #82
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Knocked this up today bit rough and ready.


But worked a treat

img_0273.jpg   img_0274.jpg  
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Old 11-07-2012, 06:56 PM   #83
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Default The hidden Insides

The main seal to cylinder screw appears to have been made of leather but crumbled to dust once opened. The whole assembly was covered in a thick black coating of grime. Have polished the assembly to help with photos and aid with identifying the different components..

img_0275.jpg   img_0276.jpg  
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Old 11-07-2012, 07:04 PM   #84
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Now its out and clean you can clearly see the screw threads to the assembly have been hand cut.

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Old 11-07-2012, 07:56 PM   #85
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This is the whole assembly taken apart. Any questions so far.

img_0277.jpg  
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Old 11-07-2012, 09:00 PM   #86
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I wonder if you can use a cork seal or gasket as replacement? I figured that that's what they probably were originally, cork seals. It's interesting they used leather. So how long until you try shooting it?

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Old 11-07-2012, 10:02 PM   #87
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I wonder if you can use a cork seal or gasket as replacement? I figured that that's what they probably were originally, cork seals. It's interesting they used leather. So how long until you try shooting it?
Next door to my business is a a pump manufacturer who is going to pressure test the the cylinder to 1000 psi. It may of been as high as 2000 but for test purposes this will do. I intend to chrono the test firing and this will give us an idea of power. We know they where more powerful than there black powder equivalent. If we do not get the FPS I expect I will further test the vessel to 2000psi. Fingers crossed.
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Old 11-08-2012, 03:43 AM   #88
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The main seal to cylinder screw appears to have been made of leather but crumbled to dust once opened. The whole assembly was covered in a thick black coating of grime. Have polished the assembly to help with photos and aid with identifying the different components..
I would think you could find a rubber o-ring to replace the worn gasket. Do you have a size? Maybe check here for a suitable replacement - http://www.marcorubber.com/

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Old 11-08-2012, 10:26 AM   #89
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Here's a place that has all sorts of leather gaskets in the UK:

http://www.rhnuttall.co.uk/Our_Products/Gaskets/Leather_Gaskets.html

Depending on how original you want to keep it, I agree with Dog rubber might be best.

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Old 11-08-2012, 04:31 PM   #90
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Air cylinder. As you can see the the charging end is threaded and appears to screw into the cylinder. The central hole is fitted with a sprung release pin which when struck by the firing pin releases the air to fire the weapon. The 2 outer holes I believe would have had a special tool ( not unlike the kind for removing the blade from an angle grinder ) I will manufacture one in the next couple of days. I do not want to do any pressure testing until I can see the state of the internal cylinder. I will be replacing all internal seals with modern equivalent.

Any comments greatly appreciated.
Sounds like your going great guns at it.

Looking at the end of the air chamber you obviously need to manufacture a hand pump with a pretty big internal thread on it, to screw on the end of that cylinder.
That does seem a bit odd too as the wider the bore on the pump the less pressure you are going to get into the chamber, Which is why most Victorian hand pump internal bore was around 3/4" in dia.
Saying that, the original pump bore cylinder could well be 3/4" in dia, logic would dictate that the internal female threaded end of the pump must have been something in the region an inch? with an external diameter of ? 1 1/2"
thats a pretty big connection!

I make the valve seal from black delrin, you will never need to do that job again.
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