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Author Topic: Making Your Own PCP Air Rifle ?  (Read 10542 times)
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« on: November 24, 2006, 11:28:13 PM »

I don't know a lot about air rifles but I do know quite a bit about firearms in general. I have a small machine shop and formal training in the use and set up of the machinery.

I'm interested in making a small pcp powered carbin air rifle but don't know where to start, don't have any idea of how they function or the parts I need to make.

Can anyone point me in the right direction ?

Thanks Bill
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Gene_SC
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    « Reply #1 on: November 25, 2006, 12:22:51 AM »

    Hi Bill

    I found a forum exclusive to making a PCP. I briefly read through some of the post and it looks like this is the place to start.. Smiley

    Good Luck
    Gene

    http://www.practicalmachinist.com/cgi-bin/ubbcgi/ultimatebb.cgi?ubb=get_topic;f=16;t=000139;p=0

    Here is a Quote from the forum:

    "THE MODERN PNEUMATIC AIRGUN – A PRACTICAL STEP BY STEP GUIDE TO BUILDING YOUR OWN" by H. M. Buckley must be the best airgun construction book out there. It covers almost everything from the trigger mechanism build to finishes, & the technical drawings cover every part of the build.
    Once I get a better understanding of safe wall thicknesses & suitable metal types/strengths for the parts of an airgun that contain the high pressure gas I'll start up a project myself.
    I got the book from gunbooks.co.uk. Not cheap but definately worth the cash.
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    THE ONES I SLEEP WITH: BSA Lightning XL, AA TX-200, AA ProSport, BSA Ultra, HW-97K, Crosman NPSS .177, FX Cyclone, HW-30 Nicle Plated, AA-S200, Crosman Marauder, CZ-634, R-9 DG, Webley/Scott UK Tomahawk, Benji Kantana, Benji Marauder, Benji Discovery.....
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    DanoInTx
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    « Reply #2 on: November 25, 2006, 01:53:19 AM »

    Myself and a friend of mine are tossing ideas back and forth about the same thing, he's an engineer and I'm an airgun guy/mechanic.  Right now we're stuck on valve design.  The poppet is simple, easy to make, etc...but not terribley efficient when coupled with a 180 degree turn.   We have thought about a sliding valve, but not so happy with that idea as sealing it may be a problem....anyways, just blabbering now....email me, we just might need a machinist on our "team"...hehe.  Gene's link has some good stuff too, I really like the "coax" valve design, but might be troublesome in its own ways.  Are you in The States?

    Dan
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    Dan

    Current shooters: Beeman HW97K .177 with Hawke Eclipse 4x16x50SFAO and Steve C. stock, Beeman R9 .177 with Hawke Airmax 4-12x40AO and Gene\'s Midas touch, Air Arms S200 with Bushnell Banner 6x24x40AO Rowan brass bling and Steve C. custom stock, BAM B25, BAM B40 .177 with BSA 3x12x44AO, Benjamin Marauder .22, Benjamin 397 pumper.

    \"repeat this mantra:
    Air gunzzzzzz, air gunzzzzzz, air gunzzzzzzz!!!  ...You will feel better\" T.E.C.2008
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    « Reply #3 on: November 25, 2006, 03:16:22 AM »

    Much as I dislike pointing anyone toward the Yellow forum these days, there's someone doing exactly that over there.  He's posted some info, but probably wouldn't have any issues with sharing additional info.  And no, Steve NC isn't involved, far as I can tell.

    Dave
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    « Reply #4 on: November 25, 2006, 04:08:32 AM »



    .



    Have you looked at the structure of the AirForec Talon/Condor?



    Amazingly powerful, accurate and simple in design.



    Oh, did I mention it can be VERY loud without some sort of shroud?



    There are sites with diagrams of the whole mechanism.





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    .
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    -=ed..................... \"...and in our dark despair, against our will... wisdom comes...\"

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    Gene_SC
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    « Reply #5 on: November 25, 2006, 05:17:46 AM »

    Don't bet on it Dave...Smiley

    Gene
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    THE ONES I SLEEP WITH: BSA Lightning XL, AA TX-200, AA ProSport, BSA Ultra, HW-97K, Crosman NPSS .177, FX Cyclone, HW-30 Nicle Plated, AA-S200, Crosman Marauder, CZ-634, R-9 DG, Webley/Scott UK Tomahawk, Benji Kantana, Benji Marauder, Benji Discovery.....
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    DanoInTx
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    « Reply #6 on: November 25, 2006, 06:05:46 AM »

    Hehe...Gene...
    If there's room in that homespun PCP for a bargraph a pie chart and a nickels worth of Delrin you can bet Steve_NC will have his nose in it before long....
    Funny...I almost feel bad for the guy and how much time he must spend wringing out longhaired math in his head all day long, bet he never even gets a good nights sleep.  We should stop insulting him, instead we should start a charity for people like him with too much time on their hands and no people skills....I'll be the first one, I'll donate my 5 cent piece of Delrin to the cause, anyone else?

    Dan
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    Dan

    Current shooters: Beeman HW97K .177 with Hawke Eclipse 4x16x50SFAO and Steve C. stock, Beeman R9 .177 with Hawke Airmax 4-12x40AO and Gene\'s Midas touch, Air Arms S200 with Bushnell Banner 6x24x40AO Rowan brass bling and Steve C. custom stock, BAM B25, BAM B40 .177 with BSA 3x12x44AO, Benjamin Marauder .22, Benjamin 397 pumper.

    \"repeat this mantra:
    Air gunzzzzzz, air gunzzzzzz, air gunzzzzzzz!!!  ...You will feel better\" T.E.C.2008
    Guest
    « Reply #7 on: November 25, 2006, 06:15:07 AM »

    Yes, I do live in the USA, in the Atlanta, Ga. area.

    I haven't tried to find any books on the suject but think that might be a good idea.

    I have been doing  a little reading on the QB78 forum, think that might be a good gun to get and experiment with and learn how they are put together.

    Bill
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    DanoInTx
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    « Reply #8 on: November 25, 2006, 06:46:15 AM »

    I have a couple QB's.  They are undoubtedly the best bang for the buck in the airgun world right now, especially if you buy one of Mike Melicks tuned QB's...$100 for a $75 gun, tuned including shipping....what more is there to say?  Not going to get one straight out of the box from China for much less $$ and the tune is worth what you pay for the gun, his work is amazing!
    http://www.airgunartisans.com/flyingdragon/

    Haven't tried going the PCP/HPA route on one of these guns (yet), but I'm guessing it could be done.  Mike mentioned on the forum here some time ago that you would need a regulated bottle(850psi or so, just like CO2) to run HPA in one of the QB variants, otherwise shot count sucks and the velocity will taper off with each shot.  I think he's most likely right, HPA isn't in a liquid form like CO2 under pressure, so the volume would definately be less....sorta like a CO2 cartridge gun when the liquid is gone(i.e. the last couple shots).  If you wanted to have a totally self contained  HPA QB you'd most likely need some way of regulating the pressure to the valve from the air resevoir...maybe something inline?  Huhm, now you have me thinking again...bad, bad, habit, I should watch more TV:)

    So let me put this together...Bulked QB78, inline pressure regulator(something before the poppet valve, inside the tube), HPA.....  I think the only thing we would need to work out is the inline regulator....might be cool if it was externally adjustable too.

    Really like this line of thinking...

    Dan
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    Dan

    Current shooters: Beeman HW97K .177 with Hawke Eclipse 4x16x50SFAO and Steve C. stock, Beeman R9 .177 with Hawke Airmax 4-12x40AO and Gene\'s Midas touch, Air Arms S200 with Bushnell Banner 6x24x40AO Rowan brass bling and Steve C. custom stock, BAM B25, BAM B40 .177 with BSA 3x12x44AO, Benjamin Marauder .22, Benjamin 397 pumper.

    \"repeat this mantra:
    Air gunzzzzzz, air gunzzzzzz, air gunzzzzzzz!!!  ...You will feel better\" T.E.C.2008
    Gene_SC
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    « Reply #9 on: November 25, 2006, 10:05:50 AM »

    I will donate an old back door screen spring from the door I swapped out last year. He could maybe use it on his next air gun trigger project.  hehe

    Gene
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    THE ONES I SLEEP WITH: BSA Lightning XL, AA TX-200, AA ProSport, BSA Ultra, HW-97K, Crosman NPSS .177, FX Cyclone, HW-30 Nicle Plated, AA-S200, Crosman Marauder, CZ-634, R-9 DG, Webley/Scott UK Tomahawk, Benji Kantana, Benji Marauder, Benji Discovery.....
    ....

    Gene\'s Tunz n Toyz
    Springer Tunin
    Guest
    « Reply #10 on: November 30, 2006, 09:42:20 PM »

    I'm in the process of trying this at the moment to a "79"
    Remove bulk Co2 adapter, replace with paintball remote hose connected to a 9oz refillable bottle to 1000psi.
    Now all that needs doing is to make it look pretty.
    Bob
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    Guest
    « Reply #11 on: December 01, 2006, 09:14:40 AM »

    What kind of vilocity do you think you will get from 1000 PSI ?

    Bill
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    Guest
    « Reply #12 on: December 01, 2006, 04:00:04 PM »

    in a light carbine starting from an off the shelf gun.Check the green (new crosman) forum.Yeah.Steve is involved.Deal...
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