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boltaction breach idea

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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boltaction breach idea

Unread postAuthor: chinnerz » Tue Jan 19, 2010 1:58 am

so i found myself without phone or internet one afternoon, and since my air rifle is busted, i decided to do a brain storming session, many pages were ripped out due to them containing bad ideas. lol you should see my bin :P

well anyways, i decided to come up with a breach system which will work well! unlike my current system.
here is what i came up with:
Image

very basic sketch...., but the system includes an outer casing with a bolt, bolt guide and a cut out slot which the user can insert the projectile (then bolt is pulled back), an inner moving pipe (connected to bolt) this pipe is closed on one side, and is under spring pressure. when moved back inlet valve is blocked, when moved forward, inlet valve is open and connected to barrel.

the issue is i have no machining tools, nor do i have access to some, and i think it will be best if this can be made out of a sturdy material which wont shatter, bent or crack when dropped or when fired.

i was thinking of making it out of wood and lining the inside with PVC and making the inner tube out of aluminium, but i am not sure yet.

this is what it would look like on a bulpup sniper rifle
Image
Ps I am aware the picture doesn’t have a fill valve :D

comments, ideas, advice, or anything at all would be greatly appreciated.
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Unread postAuthor: chinnerz » Tue Jan 19, 2010 6:11 am

another sketch, showing the 2 major components. and I’m off to Tasmania for 2 weeks so i probably won’t be on unless i can find some free Wi-Fi...
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Unread postAuthor: Cosmic Muffin » Tue Jan 19, 2010 9:31 pm

its a good idea, but i see that your going to put it on the end of your co-ax, that means theres gonna be alot of dead space from the valve to the bolt.
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Unread postAuthor: Marffy » Thu Jan 21, 2010 9:21 am

good idea. i think it will work. i'll let you build it first tho. then if it looks good and works good i'll make one.
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Unread postAuthor: boyntonstu » Thu Jan 21, 2010 9:51 am

FWIW

My slip in barrel in the Trom-Boyn has been shot over 100 times with pressures up to 550 psi and without failure.

Too much is made of locking the bolt.

The bolt lock is for firearms that generate tremendous pressures.

I always start simple and lightweight and if necessary increase as needed.

Shooting the Trom-Boyn pneumatic nail dart rifle at 200 psi

[youtube]http://www.youtube.com/watch?v=kNrLawUmDFo[/youtube]
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Unread postAuthor: chinnerz » Sat Jan 23, 2010 5:16 am

yeah i got some wifi :P, but my phone wont let me do too much...
thanks for the tips guys.
boyntonstu, i got rid of the spring mainly for "niceness", it is not needed.
Marffy, you can build it if you want, soon as i get back home i have my final year so i dont know how much time i am going to have.
Cosmic Muffin, yeah it may not be a coax, i was thinking of some sort of hammer... not sure yet.

any ways im off cys
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