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Barrel Sealer Plans - Advice

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: Tom » Mon Oct 22, 2007 10:14 am

If you are going to use a(Paintball) hammer valve, you can make the valve semi-automatic so it will automatical reset when you're filling it. By the way I am working on exactly the same gun.
GR.Tom
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Unread postAuthor: ALIHISGREAT » Mon Oct 22, 2007 11:16 am

Marco321 wrote:


Oh cool, except I'm in Australia and i cant get that stuff :(


i personally think there is not reason to ban airsoft but the aussie government obviously have found a reason, here in the uk they have changed the rules, now you have to be a registered player to buy airsoft guns which is just a hassle.
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Unread postAuthor: Marco321 » Mon Oct 22, 2007 7:21 pm

Tom wrote:If you are going to use a(Paintball) hammer valve, you can make the valve semi-automatic so it will automatical reset when you're filling it. By the way I am working on exactly the same gun.
GR.Tom


Yeah, i was thinking that about that. Oh cool, i look forward to seeing it :P

ALIHISGREAT wrote:
Marco321 wrote:


Oh cool, except I'm in Australia and i cant get that stuff :(


i personally think there is not reason to ban airsoft but the aussie government obviously have found a reason, here in the uk they have changed the rules, now you have to be a registered player to buy airsoft guns which is just a hassle.


I know ey, i think it's because they resemble a real gun and also because they are dangerous firearms according to the government. The rules are so bad here, you aren't even allowed to leave a paintball field with any CO2 or HPA in your tank (thats in NSW btw).

I adjusted the design slightly to incorporate an integrated handle into the blowgun, i also was able to now simplify the trigger mechanism. I did this so the gun can be used shotgun style without a stock. Some people my comment on the pilot volume because of the blowgun, but i had to find a comfortable median between efficiency and ergonomics. Here is the new design

Image

NOTE: The shradar(sp) is in a tee, which is using a compression fitting onto the copper chamber. The other side of the tee is threaded into another tee, so i can have the piston accessible and the blowgun attached underneath. I know the diagram doesn't exactly show that but meh, it roughly shows the idea of the valve. The design is more to show the idea, not the entire gun with pin point accuracy.
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Unread postAuthor: Tom » Sun Oct 28, 2007 11:37 am

Did you make any progress yet? I've made a little bit, I machined a reducer from 40mm to 5/8 inch(16MM) fot the barrel out of black derlin rod. The piston is already done, right now I'm thinking of the desgin.
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Unread postAuthor: to_live » Sun Oct 28, 2007 8:39 pm

i am making a sniper that is like that alot... mine is made from copper and a hand carved wooden stock. im waiting on a bit of money to come in before i start mine, altho i have most of the copper i need already.
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Unread postAuthor: Marco321 » Sun Oct 28, 2007 9:09 pm

Hey
Nice work Tom and to_live
I am staring my gun when i finish my exams in 7 days. But i changed the plans lol. I wanted to mount a homemade shock pump so its now shotgun style with a metal stock.
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Unread postAuthor: Lentamentalisk » Sun Oct 28, 2007 10:34 pm

Can you share you coaxial breach system? I am very curious.

p.s. it is spelled "Schrader"
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Unread postAuthor: Marco321 » Mon Oct 29, 2007 12:50 am

Lentamentalisk wrote:Can you share you coaxial breach system? I am very curious.

p.s. it is spelled "Schrader"


Here is a design, i was given the idea by experiment-u2 over msn about 4 or so months ago so its not mine.
Image

The tee comes out the chamber and has a plug to block airflow for when the gun fires. It goes all the way down the the barrel so there is no wasted air.

EDIT: Lol thanks :P
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Unread postAuthor: ALIHISGREAT » Mon Oct 29, 2007 2:38 am

Marco321 wrote:Hey
Nice work Tom and to_live
I am staring my gun when i finish my exams in 7 days. But i changed the plans lol. I wanted to mount a homemade shock pump so its now shotgun style with a metal stock.


i'm starting today if my parts arrive but you will probably still finish yours before i finish, and how come you are making it into a shotty style??? a pump action would only be cool if one pump=one shot...
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Unread postAuthor: Marco321 » Mon Oct 29, 2007 2:40 am

ALIHISGREAT wrote:
Marco321 wrote:Hey
Nice work Tom and to_live
I am staring my gun when i finish my exams in 7 days. But i changed the plans lol. I wanted to mount a homemade shock pump so its now shotgun style with a metal stock.


i'm starting today if my parts arrive but you will probably still finish yours before i finish, and how come you are making it into a shotty style??? a pump action would only be cool if one pump=one shot...


The homemade shock pump makes the gun look like a pump action, but in reality it will take multiple pumps to obtain pressure. I changed the design to incorporate a shock pump.
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Unread postAuthor: jackssmirkingrevenge » Mon Oct 29, 2007 2:57 am

Marco321 wrote:The homemade shock pump makes the gun look like a pump action, but in reality it will take multiple pumps to obtain pressure. I changed the design to incorporate a shock pump.


I find that above a certain pressure the shock pump has to be rested against a hard surface in order to be able to pump it without having biceps the size of Bournemouth, so unless you want to stick to 200 psi or so I would advise against an integral pump.
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Unread postAuthor: Marco321 » Mon Oct 29, 2007 3:34 am

jackssmirkingrevenge wrote:
Marco321 wrote:The homemade shock pump makes the gun look like a pump action, but in reality it will take multiple pumps to obtain pressure. I changed the design to incorporate a shock pump.


I find that above a certain pressure the shock pump has to be rested against a hard surface in order to be able to pump it without having biceps the size of Bournemouth, so unless you want to stick to 200 psi or so I would advise against an integral pump.


Lol
I work out alot :D
Also my gauge only goes to 220PSI so I'm sticking to around there :D

Quick question i have been meaning to ask you Jack, my gun is gonna be 220PSI, 3/4" copper chamber and a 8mmID/10mmOD barrel. What size chamber should i got for? I'm thinking around 60cm. I thought i would ask you because you have alot of experience with this sort of thing and i cant model my gun very well on GGDT because i don't know valve specs..... Any suggestions?
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Unread postAuthor: jackssmirkingrevenge » Mon Oct 29, 2007 3:49 am

I would suggest as big as you are comfortable with pumping. In this case if it's a coaxial I'd go with a chamber that's the full length of the barrel. At 220 psi it shouldn't be that much of a chore.

That's if you want power of course, if you want something a bit quieter make it 10 cm or so shorter than the barrel, have that last length perforated and fit baffles and barrel shroud over the barrel and chamber for an integral silencer.

It will give you a pretty wide assembly, you can look to the Delisle carbine for aesthetic inspiration:

Image

Or if you want something a bit more modern and "tactical" looking, how about the Talon SS:

Image
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Unread postAuthor: Marco321 » Mon Oct 29, 2007 4:21 am

Thanks Jack, once again you have helped me, your a legend mate. I'm going for a combination of
Image

and

Image

and i have this as my design

Image

Notice how I'm using doing my best to minimize piston movement and pilot volume :P to try be as efficient as possible.

EDIT:
One more question, for the pump, should i use 1/2" or 3/4"copper?
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Unread postAuthor: jackssmirkingrevenge » Mon Oct 29, 2007 5:16 am

A scoped shotgun eh? Sounds like a bit of a contradiction but not unheard of. For example I know the Israeli special forces use scoped bolt action Mossberg 695 shotguns with rifled barrels on bipods to fire saboted slugs as an anti-barricade weapon.

Image

One more question, for the pump, should i use 1/2" or 3/4"copper?


Go for the 1/2", less than half the pumping effort compared to the 3/4" for a given pressure.
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