Pneumatic Pellet Rifle

[Alucard]

I have two of them, a Crosman Pumpmaster 760 and a Remington Airmaster 77. To top that off, I am not buying a commercial air rifle. I do not want one, I want to build a large caliber, high power, PCP air rifle. I really do not care about being told not to, I want suggestions on how too.

[POLAND_SPUD]

well that's what I was suggesting from the very beggining

these two fit the description...

http://www.spudfiles.com/forums/heal-32 ... 11453.html

http://www.spudfiles.com/forums/378-cal ... 18720.html

do I have to tell you that there are dozens of guns like these... just check the showcase section

[Alucard]

Just one question I cant seem to find the answer to, how many shots can you get per fill? Is it like a pcp or do you only get 1 shot each time?

[POLAND_SPUD]

from most launchers you get 1 shot per fill.. there are designs which use a hammer valve that can get several shots from a tank but they are much weaker...

however, nothing stops you from getting a small portble CO2/HPA or propane tank to fill the gun...



I don't mind being asked questions but don't expect people to spoonfeed you...

you seem to be an absolute beginner - there is nothing bad about it really we've all have been there.. but you need to spend some time studying information,reading old threads etc. all of us did that and there is no other way

[Ragnarok]

I really do not care about being told not to, I want suggestions on how to.

We get a lot of people like this. People who come in with an idea that would be a challenge (or even beyond a challenge) for even the forum's finest, but insist on being told how to do it, because they think they can.

I refer you to the Dunning-Kruger effect. This is where "people reach erroneous conclusions and make unfortunate choices but their inexperience leaves them without the metacognitive ability to realize it."
In simpler terms, D-K says that many people who don't know a subject also don't know how much they don't know it, and thus dramatically overestimate their skill level.

No offence intended, but you are one of these people. Particularly so in that you've been TOLD that you're not in a position to do these things, and you've brushed the comments aside.

On that budget, without having a machine shop already available (which if you have that budget, I doubt you do) and with little enough knowledge on the subject that you have to ask how to do it, you can forget the 3000 psi hyper-accurate semi-auto air rifle you're looking for.
Even I would baulk at doing it on twice that budget (and with the aforementioned machine shop available - i.e. paying for materials only), and if I may be immodest for a moment, I do know the subject pretty well.

In my honest (and genuinely experienced) opinion, I can tell you that when we tell you not to rather than telling you how to, we are doing it in your interests.

More positively, there are things you can do on that budget, but your optimistic design brief is not going to be amongst them.

[Copperboy]

Perhaps something like this:


(There are some schematics on his photobucket, linked in the info section)

Also Brian the brain has made some interesting work regarding multiple shot ability:
http://www.spudfiles.com/forums/vid-upb ... 17827.html

If you turn of the air flow down the barrel once your projectile has cleared it, I could only see it getting more efficient and not less powerful.

I too have thoughts about making a homemade pcp, 1/2" bsp works nice with the ASA thread on most paintball tanks, and this valve: http://www.spudfiles.com/forums/i-gotz- ... 18317.html
(which I've already made ) would be quite a simple way of getting a leak-free hammer valve.

[inonickname]

If you have a lathe to work with, then the airforce (condor) would be ideal for multiple shots.

However, if you don't have that kind of effort/time/money/etc available then a barrel sealing piston is the way to go. You will have a hard time making one to take 3000 psi without fair machining facilities.

While a piston valve will yield less shots, it will have a dramatic performance increase. A hammer valve can be used to give multiple shots.

[frozebyte]

Putting things in a simple way, you(alucard) should go browse around the how-to/wiki/showcase sections to get a better idea of how these spudguns are being made/work. All of us did that, and nobody is getting any free detailed plans on making a complete spudgun, not to mention with those high specifications.

Check out how piston valves work on the how to section, and look and READ through the showcase section to get an idea of how the others build their cannons.

p.s I know im probably not in a good position to comment cause i dont have any decent achievements against my name.

Cheers

[Technician1002]

I really do not care about being told not to, I want suggestions on how to.

We get a lot of people like this. People who come in with an idea that would be a challenge (or even beyond a challenge) for even the forum's finest, but insist on being told how to do it, because they think they can.

I refer you to the Dunning-Kruger effect. This is where "people reach erroneous conclusions and make unfortunate choices but their inexperience leaves them without the metacognitive ability to realize it."
In simpler terms, D-K says that many people who don't know a subject also don't know how much they don't know it, and thus dramatically overestimate their skill level.

No offence intended, but you are one of these people. Particularly so in that you've been TOLD that you're not in a position to do these things, and you've brushed the comments aside.

On that budget, without having a machine shop already available (which if you have that budget, I doubt you do) and with little enough knowledge on the subject that you have to ask how to do it, you can forget the 3000 psi hyper-accurate semi-auto air rifle you're looking for.
Even I would baulk at doing it on twice that budget (and with the aforementioned machine shop available - i.e. paying for materials only), and if I may be immodest for a moment, I do know the subject pretty well.

In my honest (and genuinely experienced) opinion, I can tell you that when we tell you not to rather than telling you how to, we are doing it in your interests.

More positively, there are things you can do on that budget, but your optimistic design brief is not going to be amongst them.

Well put. Only a couple people on the fourm are experienced in high pressure. I am still learning and working on the concepts. I have worked with some high pressure systems in excess of 3500 PSI in my line of work, but all that requires knowledge and safety precautions. Even with the experience, in building my own stuff. I have only slightly exceeded 100 PSI for home built stuff.

Start low.. High pressure is not like swimming. Once in the deep end in swimming 6 feet or 600 feet is the same. In high pressure air, 30 psi and 300 psi is not the same.. 3,000 psi is another order of magnitude more dangerous. Starting there is no place for armatures. I know enough to know that I never will build a 3,000 psi launcher. The only thing I do with 3,000 PSI is connect the proper regulator and that's all I'll ever do with it.

[jackssmirkingrevenge]

Starting there is no place for armatures.

Particularly in the field of pneumatics

[Big-E]

IMO you should just buy a pellet gun, especially if you're wanting to run high pressure. For the money you spend, and the engineering that goes into it, it's more cost-effective to buy a PCP rifle.

of course, if you want a multi-pump pneumatic, building from scratch is doable, even preferred if you have an old gun to salvage parts from (like a rifled barrel, breech, valves, etc.)

there's an entire cottage industry that has been formed around modifying commercial airguns. Maybe that would be the just the ticket for you in this instance.

[dewey-1]

Starting there is no place for armatures.

Particularly in the field of pneumatics

Come on jsr, give us electronics guys a break!
Especially us old ones! Can't we blame old age?

Spelling is correct at least.
It could have been like this;
amature, amater, amatore, amatshure, amatuer, etc

Some words can get stuck in your head!
At least some of us know how to use the spell check!