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Copper piston cannon (updated bolt)

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Copper piston cannon (updated bolt)

Unread postAuthor: SpudBlaster15 » Sat Oct 20, 2007 12:14 am

I just finished up this launcher today. It is essentially a redesign of my first copper pneumatic launcher. It now has a more rifle-like shape, and a smaller chamber to allow me to more easily pump it to 250 - 300psi. It takes roughly one minute to reach 300psi. At such high pressures, this is one loud gun.

Specifications

Chamber: 0.787" x 34"
Barrel: 0.545" x 42"
Loading: Bolt action
Valve: Barrel sealing piston
Piston: Cast Ethylene Vinyl Acetate
Piston travel: 1/4"
Pilot valve: Modded blowgun
Fill valve: Threaded schraeder valve
Maximum pressure used: 300psi

Pictures

The whole launcher:

Image

Pilot/Filling assembly:

Image

The breach port has now been increased in length from 2.5" to 7.5".

Breach closed:

Image

Breach open:

Image

Unfortunately, the epoxy joint between the 45* street elbow and the 90* elbow continues to leak as the pressure climbs past ~275psi, so the pressure gauge has yet to read higher than this.

Image
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Last edited by SpudBlaster15 on Mon Oct 22, 2007 11:57 pm, edited 1 time in total.
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Unread postAuthor: jackssmirkingrevenge » Sat Oct 20, 2007 12:59 am

Piston: Cast Ethylene Vinyl Acetate


Is that a posh way of saying "hot glue" pfffft :P

I like the redesign, perhaps a more comfortable bolt handle is in order though :) bring on the damage pics/videos :D
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Unread postAuthor: spanerman » Sat Oct 20, 2007 4:46 am

you should turn the t so the flat surface is at the rear, and have a hose to the blowgun mounted on the 45 degree bit and you will have a nice bulpup design :twisted:
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Unread postAuthor: noname » Sat Oct 20, 2007 11:04 am

The only thing I'd change about it is reduce the fill/pilot T to 1/4" instead of the larger T (1/2"?), then the bushings to the blowgun and schrader. Much less cash to dish out, along with a smaller pilot volume.
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Unread postAuthor: SpudBlaster15 » Sat Oct 20, 2007 11:16 am

jackssmirkingrevenge wrote:
Piston: Cast Ethylene Vinyl Acetate


Is that a posh way of saying "hot glue" pfffft :P

I like the redesign, perhaps a more comfortable bolt handle is in order though :) bring on the damage pics/videos :D


I figured it would be you that picked up on the common name of Ethylene Vinyl Acetate. :D

The bolt handle removed lots of flesh from my hand, so I threaded a piece of wood onto the screw.

spanerman wrote:you should turn the t so the flat surface is at the rear, and have a hose to the blowgun mounted on the 45 degree bit and you will have a nice bulpup design


I may end up repositioning the blowgun eventually, but for now I feel that it is fine.

noname wrote:The only thing I'd change about it is reduce the fill/pilot T to 1/4" instead of the larger T (1/2"?), then the bushings to the blowgun and schrader. Much more cost effective, along with a smaller pilot volume.


The 1/2" T is filled almost entirely with vinyl tubing (piston bumper), and hot glue, making the overall volume less than that of a 1/4" T. Cost isn't an issue, as the 1/2" to 1/4" bushing are only $1.09 each.
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Unread postAuthor: ammosmoke » Sat Oct 20, 2007 1:44 pm

Cool! But, um, couldn't you have thought of something less ghetto than a screw for a bolt handle? Maybe a metal tent stake? :D
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Unread postAuthor: SpudBlaster15 » Sat Oct 20, 2007 2:25 pm

The screw was used to enable me to thread on a more comfortable handle. I took the pictures prior to adding a "proper" handle.
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Unread postAuthor: SpudBlaster15 » Tue Oct 23, 2007 12:10 am

The original post has been updated.
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Unread postAuthor: ammosmoke » Tue Oct 23, 2007 12:42 am

Ahhhh much better!!!
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Unread postAuthor: Mateo » Tue Oct 23, 2007 10:37 pm

what is the advantage of copper pipe compared to PVC?
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Unread postAuthor: thespeedycicada » Tue Oct 23, 2007 10:41 pm

well obviously it holds more pressure and looks cool it is also not sensitive to solvents and stuff like pvc and is less shock resistant.
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current projects: co-axial piston valve.Status DONE!
S.P.E.C.S update mk 1 construction begining in febuary all the maths for it are done plans are drawn up and parts are listed.
NEXT project:auto piston valve.
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Unread postAuthor: hi » Tue Oct 23, 2007 10:45 pm

Mateo wrote:what is the advantage of copper pipe compared to PVC?



copper is a better building material, in my opinion. its stronger and safer. it also looks much better, but it is much more expencive.

you can use either one, its up to you. try to get type M, its thicker than type L, L or M works fine, but M it thicker and therefore safer.

the other drawback to copper is that it requires more skill to put together, but any dedicated novice can do it.
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: st.croixsurfer » Sat Oct 27, 2007 7:18 pm

i absolutly love it
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Unread postAuthor: MrCrowley » Sat Oct 27, 2007 7:25 pm

How did I not see this? :shock:

It looks great, nice job, personally I would've kept the blow gun how it was but black works.



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Thank you, thank you all. I'll be here to Thursday for autographs
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Unread postAuthor: windshrike » Sat Oct 27, 2007 7:28 pm

MrCrowley wrote:How did I not see this? :shock:

It looks great, nice job, personally I would've kept the blow gun how it was but black works.



3000 posts

Thank you, thank you all. I'll be here to Thursday for autographs


Great gun, I love the long gun feel; now if only there were a stock.........
No autographs from you, Mr.Crowley

JK I'll take one :P
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