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BB/Marble Rifle Design

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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BB/Marble Rifle Design

Unread postAuthor: STHORNE » Sun May 11, 2008 5:19 pm

Hello fellow spudders!
I am really eager to make myself a marble rifle. I have made plans and have all the supplies to make it.

My question is:
Will I be using it's power to its full potential using this design?

With that being said, here are the facts about my design:
It's going to have a piston valve assembly
It's going to have a homemade stock (which so far looks awesome!)
It's going to mimic the appearance of a real Rifle (the most it can be)
Already have the marble barrel made...its a perfect fit!

Here's a labeled pic of my design, tell me what you think...
Click on the pic for a better view of the numbers

P.S. - All internals that over-lap the stock in the pic will be hidden inside the stock...
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STHORNEmarblerifle.PNG
1. Marble barrel
2. Breech loading mechanism
3. Copper air tank (1/2" receiver)
4. (1 of 2) 1/2" T-fittings
5. 1/2" ball valve
6. 1/4" Quick Connect nipple
7. 1/4" hose barb adapter
8. 1/4" pressure hose
9. modified blowgun
10. Scope
11. Homemade Stock
12. Piston
Last edited by STHORNE on Thu May 15, 2008 4:52 pm, edited 2 times in total.
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Unread postAuthor: JDP12 » Sun May 11, 2008 5:23 pm

i say scrap the hose, replace it with brakeline, maybe hide the blowgun in the stock or replace it with a ball valve with a trigger handle ( see mitchza89s third boomstick)
will help with aesthetics.
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Unread postAuthor: STHORNE » Sun May 11, 2008 5:28 pm

well...i have a different style blowgun that will look awesome on it, i just made that one (basic design) so you guys knew what the hell I was talking about lol.
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Unread postAuthor: Lentamentalisk » Sun May 11, 2008 5:33 pm

if you use quick disconects, rather than schraeder valves, then you can just stick the female side on the gun and leave out the ball valve. come to thing of it, you dont need that ball valve at all, schraeders dont let any back flow.
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Unread postAuthor: spudmatic » Sun May 11, 2008 5:34 pm

You will probably become the envy of everyone on spudfiles if you can pull this off(including me 8) . How big of a chamber do you expect to fit in there? A psi guess?
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Unread postAuthor: STHORNE » Sun May 11, 2008 5:54 pm

Lentamentalisk wrote:if you use quick disconects, rather than schraeder valves, then you can just stick the female side on the gun and leave out the ball valve. come to thing of it, you dont need that ball valve at all, schraeders dont let any back flow.


I was thinking using the female instead of the male "nipple" (not schreader), but when you disconnect it from the compressor hose, it gives off maybe 4-6 psi, so I was just thinking as accurately as possible but I will probably end up doing that, and using the female Quick connect rather than the male nipple.

spudmatic wrote:You will probably become the envy of everyone on spudfiles if you can pull this off(including me Cool . How big of a chamber do you expect to fit in there? A psi guess?


"you can pull this off?"
Ha Ha Ha, let me correct you...."when you pull this off." lol

what do you mean "how big of a chamber do you expect to fit in there?"
what is "there"? Anyway, I plan on taking it to the highest psi i can with my 120psi air compressor (psst....that means 120psi).


Oh! and ilovetoblowthingsup, I took a pic of the blowgun I plan to use. The red line is where I plan to cut it to optimize space.
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Unread postAuthor: spudmatic » Sun May 11, 2008 6:07 pm

You did say that all internals that overlap the stock will be hidden inside, and if im correct thats your chamber there under the barrel. :wink:
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Unread postAuthor: STHORNE » Sun May 11, 2008 6:10 pm

Oh yeah. yes, it will also be hidden inside the stock handle, in my drawing the stock isn't quite low enough to completely cover the bottom, but the real stock will cover it, and will only have about an inch of the end sticking out.
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Unread postAuthor: POLAND_SPUD » Sun May 11, 2008 7:53 pm

I don't recomend using female quick connect fittings... they loose as lot of air when diconecting esspecialy at higher pressures
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Unread postAuthor: FordGtMan » Sun May 11, 2008 10:06 pm

Looks good so far. I had my own efforts doing this and i have not got around to nearly finishing it. I say scrap the air tank on there and base the chamber on 1/2" copper pipe. be much easier to fit the stock into the design. Heres was my design...
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Unread postAuthor: STHORNE » Mon May 12, 2008 4:02 pm

very nice design ford. I'm starting to lean towards the 1/2" copper pipe chamber instead of the tank..... it would be easier to fit in the stock.

nice idea, thanks
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Unread postAuthor: FordGtMan » Mon May 12, 2008 4:34 pm

Thanks. Hope to see you finish it. You should make a high pressure pump to make up for the smaller chamber too :)
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Unread postAuthor: Hawkeye » Mon May 12, 2008 5:14 pm

You should have the fill behind the piston since it will tend to seal more reliably.
You could very easily build a high pressure pump into the stock and pump the gun vertically up and down like an old style "Bate(?)" air rifle.
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Unread postAuthor: STHORNE » Mon May 12, 2008 8:43 pm

I'll think about the high pressure pump...

thanks guys :D :wink:
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Unread postAuthor: JDP12 » Tue May 13, 2008 7:33 am

i say go with 1/2" copper for chamber... then a high pressure pump or CO2- speaking of which can copper hold 800 PSI?
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