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pneumatic skewer sniper rifle bolt action

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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is it a good idea

yes
4
44%
no
2
22%
it suck mankinies
3
33%
 
Total votes : 9
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Unread postAuthor: Redcoat » Sun Sep 09, 2007 2:20 am

yeh but the grenade cup, i showed you my idea for it on thursday,

Anyway, If your shooting a bb or a small pellet i would go Heavy duty Blowgun or Piston valve.
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Unread postAuthor: Mitchza89 » Sun Sep 09, 2007 2:21 am

Yeah mine is going to be an all metal piston valve gun with a attatched 360psi shock pump but it might be hard Rhys if your new to spudding to make a piston valve. Small valves are pretty tricky to make, makes it even more tricky if your want to use high pressure due to leaks.

But the only way you get better, is if you give it a go. So by all means go for it, I'll be here if ya need any help. My gun should be up and running pretty soon so I'll post it straight away.
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Unread postAuthor: Redcoat » Sun Sep 09, 2007 2:23 am

I'm in the process of making a piston valve as well using dowel rod.
It's to shoot Custom Built pellets.
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Unread postAuthor: Mitchza89 » Sun Sep 09, 2007 2:25 am

Sounds good. What psi you going to be running?
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Unread postAuthor: Redcoat » Sun Sep 09, 2007 2:30 am

100psi maybe more.
I actually have a psi limit, because I mainly do my shooting indoors and the fact that there is a crapload of hazards around my house and it's really easy to see into my house from the road. And 100psi is probably pushing that limit.
Can't wait to take it to a farm though.
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Unread postAuthor: Mitchza89 » Sun Sep 09, 2007 2:33 am

100psi in such a small bore doesn't work too well. Small bore guns need alot of pressure to get any good results at all but I used to fire my old bb gun at 110psi because it was through a sprinker valve and it used to go through 10mm MDF board and rips cans pretty easy so if thats what your after, then be my guest and have fun :D .
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Unread postAuthor: Redcoat » Sun Sep 09, 2007 2:41 am

well i will be using a relatively small chamber to get higher pressures.
SO i will be able to pump it up quite high without anyone noticing as much.
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Unread postAuthor: rhys_pesantsrevolt » Sun Sep 09, 2007 3:33 am

sounds good did u use metal of plastic bbs mitch
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Unread postAuthor: Redcoat » Tue Sep 11, 2007 5:26 am

Well to rifle it, I would have straight up gone lathe.But not many people have access to this (including me) so just use a drill(but keep it steady).
i don't know if those ideas actually and i don't think they would.

You best bet would be making a ghetto hop-up for increased accuracy instead of rifling.

Happy SPuddin'
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Unread postAuthor: rhys_pesantsrevolt » Tue Sep 18, 2007 6:59 pm

hop up hmmmmm should I make it with solder
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Unread postAuthor: Redcoat » Wed Sep 19, 2007 4:24 am

It depends on what your shooting, If your shooting metal bb's it will broke away over time.
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Unread postAuthor: rhys_pesantsrevolt » Fri Sep 21, 2007 5:35 pm

i think i will use plastic bbs there easy to get (not really) but hey there easier to get than metal bbs.
if i can get to bunnings today i will have pics in 2 days tiome when i am done painting and testing it.
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Unread postAuthor: Lentamentalisk » Fri Sep 21, 2007 6:28 pm

can one of you explain to me what a "hop-up" is and how to make one?
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Unread postAuthor: windshrike » Fri Sep 21, 2007 6:32 pm

Hop-up exerts a little backspin on the bb by pushing down on it as it moves forward. The backspin then causes the bb to be pushed 'up' in flight due to air pressure difference. It works by pushing down on it as it is shot, so a tiny piece of rubber above and just in front of your bb will work, as rubber can bend slightly as it is pushed out of the way. Also, you will need to adjust it, so it doesn't put too much backspin(they float too far up) or too little(they fall too quickly after traveling a certain distance).
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Unread postAuthor: Lentamentalisk » Fri Sep 21, 2007 8:09 pm

so maybe something like this:

__|_|_____________________
_0________________________ ==>

_______
where the _______ is the barrel and the |_| is a little rubber plug that you can push down to adjust and the 0 is a bb?

or should it be on the end of the barrel like this:

____________________|_|___
_0________________________ ==>
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