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Old 11-08-2012, 04:36 PM   #91
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Originally Posted by Davyboy View Post
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..
This is fascinating, never seen anything like this before!
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Old 11-08-2012, 08:46 PM   #92
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This is a close up of the air release valve. As you can see the spring has not been cleaned, This was the state of the whole assembly before cleaning. I have decided not to change the spring as the strength of the spring dictates how much air is released on firing and therefore velocity of projectile. The bulbous dark coloured end to the left is the air release seal, I believe it to be animal horn as Vag suggested earlier.

img_0278.jpg  
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Old 11-08-2012, 09:58 PM   #93
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Have just realised I cannot pressure test the fooking thing until I manufacture the charging adapter. This is not an easy task. The engineers among you will realise A non standard thread is difficult to reproduce. I have run a full set of thread gauges on these threads. Nothing fits. Therefore it may take a week or so on my old Myford lathe to reproduce.

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Old 11-08-2012, 10:04 PM   #94
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It is amazing this thing was produced 170 years ago

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Old 11-09-2012, 10:28 AM   #95
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I am curious to see how well you match up the threads. That does not sound like an easy task. Very impressive my good man, very impressive

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Old 11-09-2012, 06:40 PM   #96
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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/

Yes I intend to visit our local air gun specialist ( I know the shame of it all ) to see if there are any modern day equivalent I could retro fit.
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Old 11-09-2012, 06:43 PM   #97
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I am curious to see how well you match up the threads. That does not sound like an easy task. Very impressive my good man, very impressive
Well, challenge taken my threads will be perfect. However if I don't get back to you in a years time I may be having problems.
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Old 11-09-2012, 09:14 PM   #98
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Originally Posted by rocshaman View Post
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?
Well lets hope the fooking thing don't blow itself apart when we pressure test it.
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Old 11-09-2012, 09:26 PM   #99
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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.
I have considered the size of the bore cylinder connection. I intend to make an inner sleeve that will seal when screwed tight and will form a seal just around the outside of the pressure release valve. As pointed out by Vag the 1 inch connection would be too large. I should point out I will not be pumping 1000 times or whatever. I will be charging with a divers bottle that I purchased today.
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Old 11-11-2012, 07:40 PM   #100
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OK last pick for a while on this thread as I will be making the charging adapter to fit the reservoir. This is the charging port viewed from the inside, showing the internal threads for the shut off valve housing. How the hell you would make something like this by hand beggers belief.

img_0279.jpg  
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