GTA
General Discussion To Gateway To Airguns => Airgun Gate => : November 24, 2006, 11:28:13 PM
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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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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.. :)
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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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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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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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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Don't bet on it Dave...:)
Gene
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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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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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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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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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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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What kind of vilocity do you think you will get from 1000 PSI ?
Bill
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in a light carbine starting from an off the shelf gun.Check the green (new crosman) forum.Yeah.Steve is involved.Deal...