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| Building a Modern Pneumatic Airgun |
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| 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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