Gallery, Projects and General > Project Logs
Building a Modern Pneumatic Airgun
Stot:
Ok 1/2 way though the air inlet valve.
The ends of the air tube are brass valves. One end allows air in only at the muzzle end, the other end is a poppet hammer valve that will momentarily open to allow air to escape.
As far as machining goes the brass valve housings are 80% the same, so ill cover it once here, and then just show what Is different on the poppet valve when I do that.
The Inlet end calls for a standard 1/8 BSF high pressure air thread for filling. This is where I am making my first change to the design. I wont be using the standard fitting to fill, instead I will use a BSA style quick fill probe. This works by just slipping an o-ringed probe into a filler port and starting to fill. ( more on that when i do the other end )
So, Starting with a piece of solid brass I...
* Faced off the bar and drilled and bored a series of 3 stepped holes. These will house a sprung valve pin that acts as a 1 way valve. The pin and spring is held in by a plug screw and the largest hole will be threaded later.
* Turned the outside to be the major diameter of the thread to match the air tube.
* Turned a step in the end of the valve housing to allow an o-ring to be positioned inside the unthreaded section of the airtube.
* Threaded the valve housing to match the air tube.
* Threaded the inside of the valve housing to take the plug screw.
Thats as far as I got tonight. Still, making good progress so far. :D
Cheers
Stot
Brass_Machine:
-- fixed your image tags. Fro some reason the pictures weren't showing up.
Very nice work. Threading looks great!
Eric
Stot:
--- Quote from: Brass_Machine on November 04, 2010, 07:45:50 PM ----- fixed your image tags. Fro some reason the pictures weren't showing up.
Very nice work. Threading looks great!
Eric
--- End quote ---
Cheers Eric, I must have left the ?attredirects=0 bit on the images. :doh:
I put the good threads down to having a nice big sturdy machine. :thumbup:
Cheers
Stot
Gerhard Olivier:
Nice job Stot
Keep it coming - hungry for more.
Gerhard
Brass_Machine:
--- Quote from: Stot on November 05, 2010, 03:26:51 AM ---Cheers Eric, I must have left the ?attredirects=0 bit on the images. :doh:
I put the good threads down to having a nice big sturdy machine. :thumbup:
Cheers
Stot
--- End quote ---
Yup. No big deal. :)
Eric
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