Building a Modern Pneumatic Airgun

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Stot:
Found a few hours this morning to finish the other end of my inlet valve, and make the other one too. :clap:

The fill end of the valve would normally be just a threaded nub to connect to an air hose, kinda like a tyre valve. I decided to go with a quick fill valve instead. With the quick fill valve you have a probe on your air line with a hole coing through it crossways instead of out the end and 2 o-rings either side of the probes outlet.

You push the probe into a hole cross drilled into the end of the valve and as you pump the pressure seals the probe in by pushing in opposite directions against the two o-rings. When you're done filling you relieve the pressure and just pull out the probe. You can see the probe in the last couple of pics.

So, this part I...

* Used the air tube as a mandrel for the valve. This made it easier to hold and not damage the threads.
* Turned down the end to have 3 steps, and faced it off down to dimension/
* I files the burs off the edges and that was the turning done.
* Mounted the valve in my 4 jaw chuck so that I could cross drill it.
* I used an end mill smaller than the hole I wanted to make just to make sure I had the valve centered. Its easy to see if a cylinder is centered by the mark an end mill makes.
* Center drilled and then drilled a small hole all the way through the valve.
* Drilled a hole the size of the fill probe to a preset depth. I put an o-ring on the drill bit to let me know how far to drill. This hole doesnt go all the way through but stops a couple of mm in from the other side.
* Used a center drill to chamfer the edges so it doesn't damage the o-rings on the probe.

Thats the inlet valve housings done for both rifles. The valve internals ill do in the week.

Cheers
Stot

Powder Keg:
Looking great so far!! I am interested in Air guns. But have never had the time to build one or even mod the ones that I own. I have the plans for 2 or three including one that looks like a cane. I would like to build that one one day:o)

Keep up the good work!!!

johnbaz:
COR!! - This is sooo intersting!!, i love airguns and can't wait for the next update :clap:

My precharged rifles, the career has given me a hell of a lot of trouble but i have it shooting smoothly now, also the Huntsman sporter developed a leak, i had to strip it and re-face the valve as it had a nick in the face...

Good luck with the build :thumbup:

John :dremel:

Stot:
Nice collection. I have a 2 PCPs, a Parker Hale Phoenix and a BSA Ultra Multishot. I also Have a Theoben SLR98, BSA Meteor, ASI Paratrooper, HW45 Pistol, Gamo P800 Pistol and a S&W 686 Pistol.

I did have an Alros Trailsman too and its a real simple take down PCP rifle. Really easy to make so I think ill make my own version of that some day too.

I'd like to see that cane gun too. Youre not allowed them here in the UK I believe Its classed as a concealed weapon. ::)

I have other plans I bough for a multi stroke pneumatic rifle that look good too.

Cheers
Stot

johnbaz:
Hi Stot

I thought you were allowed to have the walking stick (air)guns as long as you didn't have any rounds for them, i think they all use obsolete calibres ::)

I turned one down about fifteen years ago, it needed repairs but was only £30 :(

Here's the rest of my collection..

I also have a pistol collection, Webley's and BSA 240's

John :beer:

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