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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: Marco321 » Sun Oct 21, 2007 10:21 pm

Thanks for the comments guys

Yeah I will have to make the trigger a bit longer. I have a cannon which uses a similar designed blowgun, except no lever, you just push down on the push-button thing, it is easy to use at 100psi, 300-400psi shouldn't be a problem because this version will use a level. I have been thinking about what to make the trigger out of and in my exam today I thought about using epoxy putty and shaping it with the dremmel, file and sand paper.

One more question, I will attach the barrel which is aluminum to a compression end cap with a hole in the center with metal epoxy putty, this will hold right? I will have the epoxy putty around the barrel and touching the chamber all around, and it will be like 10-20mm long so i should have enough surface area for it to grip.
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 21, 2007 11:16 pm

It's a good idea to file some notches in the barrel where it's going to contact with the epoxy for much better grip.
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Unread postAuthor: Marco321 » Sun Oct 21, 2007 11:20 pm

What do you mean?
Its epoxy putty so don't i just stuff it down so it fills the space at the end between the barrel and inside of chamber?
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 21, 2007 11:27 pm

Yes but it has to adhere to the surfaces, and as with epoxy resin abrading the surface promotes better adhesion.
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Unread postAuthor: Marco321 » Sun Oct 21, 2007 11:40 pm

Its metal epoxy putty I'm going to use... That reminds me, do i need to scratch the surface to use metal epoxy putty? I know you just said an answer above, but I'm not sure if you are referring to regular epoxy or metal epoxy putty.
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 21, 2007 11:42 pm

With any glue (and even though it's putty, it still has to stick to the metal) a rough surface is always better than a smooth one.
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Unread postAuthor: Marco321 » Sun Oct 21, 2007 11:55 pm

jackssmirkingrevenge wrote:With any glue (and even though it's putty, it still has to stick to the metal) a rough surface is always better than a smooth one.


Thanks O great epoxy master :P

Ill do that, my PVC coaxial had an ummmmmm issue, i charged it to to around 80PSI, the barrel was glued in with epoxy, but i didn't scratch the surface..... the barrel blow out.... scared me alot lol... but it was in the garage without ammo luckily. This was about 2 months ago
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Unread postAuthor: Novacastrian » Mon Oct 22, 2007 1:22 am

I think JSR's Hydrualic trigger mech is beautiful in it's simplicity, and yes he is right (as always) about abrading the surface. (it gives a kind of velcro grip)
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Unread postAuthor: Marco321 » Mon Oct 22, 2007 2:00 am

Novacastrian wrote:I think JSR's Hydrualic trigger mech is beautiful in it's simplicity, and yes he is right (as always) about abrading the surface. (it gives a kind of velcro grip)


Yeah, i might make one oneday.
On second thoughts, would a paintball type hammer valve work? What i mean by that is, instead of having the hammer valve open up the chamber to shoot a projectile, the hammer could hit the blowgun piston stem, opening it (or for jack, hitting the pin on a sharader(sp)). So the action is the spring pushes a piston, which moves back, hitting the blowgun and opening it momentarily. It could be attached to a pump or bolt to also use a magazine. It would be a version of the Sheridan Valve except it would be used on the blowgun.
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Unread postAuthor: Novacastrian » Mon Oct 22, 2007 3:56 am

Can't see why it won't work :wink:
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Unread postAuthor: Marco321 » Mon Oct 22, 2007 4:00 am

Novacastrian wrote:Can't see why it won't work :wink:


Lol, i probably wont make it until i have a practical need for it....

Oh Nova, just noticed your sig, my life goal has been achieved, appear in someones sig :P
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Unread postAuthor: ALIHISGREAT » Mon Oct 22, 2007 4:18 am

what are you gonna shoot from it? 8mm airsoft bbs? or something else?
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Unread postAuthor: Marco321 » Mon Oct 22, 2007 4:38 am

ALIHISGREAT wrote:what are you gonna shoot from it? 8mm airsoft bbs? or something else?


I don't think you get airsoft 8mm BB's, unless I'm mistaken. I have 8mm ball bearings, darts or anything else that fits in.
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Unread postAuthor: ALIHISGREAT » Mon Oct 22, 2007 5:44 am

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Unread postAuthor: Marco321 » Mon Oct 22, 2007 5:47 am



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