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Bolt action system

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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Bolt action system

Unread postAuthor: sniper hero » Sun Apr 12, 2009 7:49 pm

hello,

I plan to make a pellet sniper but I need some help with the magazine/boltaction. my idea is to make a Tbolt action system(sort of small replica of BTB's). I think it's better to have the magazine on the barrel side of the T to prevent jamming due to the air inlet pipe.
So it has to be suitable for pellets and I haven't got acces to advanced machinery. I want to use a 1/4" female T piece. the bolt in a piece of pipe from several cm long and a 1/4" male thread on one end.

thanks in advance
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design which needs some improvements
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Unread postAuthor: sputnick » Sun Apr 12, 2009 8:26 pm

1: you need a place to put in the pellet, either a magazine or a trough to put them in.

2: I am not sure a T bolt system would be the best idea for a pellet sniper, since finding a PVC t is out of the question, and the small metal ones are a little too rough for that kind of use.

3: I think you're better off with just an inline bolt that is just a barrel with a sliding cover, then find some way to put a bolt handle on that, I will draw my idea in paint, so I'll post that in a few minutes.
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Last edited by sputnick on Sun Apr 12, 2009 8:46 pm, edited 1 time in total.
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Unread postAuthor: twizi » Sun Apr 12, 2009 8:31 pm

why not take apart an old gun like a crossman 760 pump i have one thats broken take out the pump and add your valve and tank and bam your done you have a stock, bolt action and barrel
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Unread postAuthor: sniper hero » Mon Apr 13, 2009 5:55 am

sputnick: 2: I am not sure a T bolt system would be the best idea for a pellet sniper, since finding a PVC t is out of the question, and the small metal ones are a little too rough for that kind of use.

wel I plan using a brass T and a steel piece of pipe since there is no pvc in the gun at al. the advantage of a Tbolt is that you can use a rod as bolt and make the handle on VERY strong and you have no worries about projectiles being blocked.

the T will be like the one from my hammer valve. http://www.spudfiles.com/forums/hammer- ... 17843.html

hope nobody minds me using their diagrams:D

and I don't have any bought airguns at all
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CIMG1226.JPG
see adding a handle on here is difficult and not that strong
pellet_loader.gif
maybe use this as a basic idea
pellet_loader.gif (8.99 KiB) Viewed 624 times
blowback breech.gif
instead of blowback using your hands for bolt action
blowback breech.gif (29.37 KiB) Viewed 624 times
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Unread postAuthor: psycix » Mon Apr 13, 2009 7:48 am

I think spudnicks diagram is a good idea.
It solves the problem of your last pic.
see adding a handle on here is difficult and not that strong
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Unread postAuthor: sniper hero » Mon Apr 13, 2009 8:43 am

yes in some sort it does but it has more dead volume and is difficult to make a magazine on that

I think I know a way to do it but I need to work it out

thanx for the help btw
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Unread postAuthor: sputnick » Mon Apr 13, 2009 9:26 am

The problem I see with your idea, is that you would need to put some form of guiding rod in to get it through the t, because almost all of the steel ones I have seen look like the diagram attached below on the inside. For the ideas you are proposing, you would need to custom build the magazine anyways, unless you have square pipe fittings :roll: and the T would need to be the perfect size for the pellets, if you put a pellet through one of those (see below) T's, you would never get a decent feed. Forcing air through them is one thing, but keeping a direction sensitive soft metal pellet going through right would be a massive challenge.

And for my diagram above, if you want to add a magazine to it, then put the outer sleeve on the inside, and instead of the trough, put a magazine tube. simple enough.
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Unread postAuthor: sniper hero » Mon Apr 13, 2009 9:33 am

And for my diagram above, if you want to add a magazine to it, then put the outer sleeve on the inside, and instead of the trough, put a magazine tube. simple enough


I don't get this :(

I can guide the rod inside a pipe fitting which can be screwed into the T, this gives a strong guide and it's very easy
tomorrow I will buy some stuff to make a start.

thnx for your help I really like it :D
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Unread postAuthor: nibbler125 » Mon Apr 13, 2009 10:10 am

you got a good idea and you can try to hava a gravity loading system
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Unread postAuthor: Brian the brain » Mon Apr 13, 2009 3:39 pm

In my T-bolt, the barrel goes all the way through the T.

So no problem there...
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Unread postAuthor: sniper hero » Tue Apr 14, 2009 4:25 pm

how does the the air come in the barrel? holes?
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Unread postAuthor: psycix » Wed Apr 15, 2009 6:35 am

I think he drilled one big hole in the barrel pipe, where the T junction is.
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Unread postAuthor: sniper hero » Wed Apr 15, 2009 8:04 am

ok that's almost the same:D
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