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The BFS - Poly Piston gun - COMPLETE!

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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The BFS - Poly Piston gun - COMPLETE!

Unread postAuthor: Mitchza89 » Sun Jun 08, 2008 10:47 pm

G'day spudders,

It's done. The first all poly piston tee-valve on files' *Takes a bow :D*. I just finished it today. I didn't have the money to get a 25mm ball valve to actuate it, so I just used a 1/2'' ball valve and tapped it into a 25mm poly end cap.

Specs:

Name: - The BFS (Big F@#kin' Sawn-off)
PSI Range: - 5-300psi (yes the gun works at pressues as low as 5psi)
Chamber: - 600mm 1'' Poly Pipe.
Barrel(s): - 600mm 1/2'' PN18 Pressure pipe
- 1000mm 1/2'' PN18 Pressure pipe
Piston: - Cast hot glue.
Piston travel: - 30mm.

Pic time!
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Last edited by Mitchza89 on Mon Jun 09, 2008 1:41 am, edited 1 time in total.
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Unread postAuthor: hi » Sun Jun 08, 2008 11:12 pm

it looks good, but didnt you post this yesterday?
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Unread postAuthor: Mitchza89 » Sun Jun 08, 2008 11:15 pm

That's the finished model. Yesturday was just the prototype.
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Unread postAuthor: battlemonkey » Mon Jun 09, 2008 1:32 am

nice looking gun :D . Don't want to sound dumb, but is that other thing you picture in your photos a homemade pump?
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Unread postAuthor: Mitchza89 » Mon Jun 09, 2008 1:36 am

Yes mate it sure is :D. My bike pump broke so I'm forced to use my homemade high pressure pump. I built this gun for 300+psi and with my pump, It's a reality :D.


....Only problem is the pump's low volume. It takes me 25 pumps to get to 100psi.
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Unread postAuthor: THUNDERLORD » Mon Jun 09, 2008 1:46 am

Nice!!! I like the way your "whammy" style grip looks.
I also like the copper barrel. And the name (BFS). :wink:
Good job Mitchza89

Hope to see more pics if you polish 'er up/ paint. 8)

EDIT:Forgot to ask: So you open the trigger and fill through the handle then close the trigger and disconnect the fill right? Thanks Mitch
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Last edited by THUNDERLORD on Mon Jun 09, 2008 1:51 am, edited 1 time in total.
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Unread postAuthor: Mitchza89 » Mon Jun 09, 2008 1:49 am

Thanks very much for that mate :D. I just spun the air chamber around 180' and it makes the perfect stock. The valve setup sits a fraction higher then the stock so everything feels so comfy to hold.
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Unread postAuthor: BlackH » Mon Jun 09, 2008 2:38 am

Thank you buddy this is so simple yet I never would have thought about it a nice tune-able valve nice idea, this will so be in my next gun!!!!
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Breaking stuff with a Big Bang haven’t been this much fun!!!!!!!!!!


http://www.spudfiles.com/forums/bh-2400 ... 14078.html
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Unread postAuthor: Mitchza89 » Mon Jun 09, 2008 2:47 am

Thank you very much mate. That was the thing I loved about this valve. I was able to set how much pilot I had by tightening the sealing face tube and bringing it closer to the piston housing. It doesn't matter on how long or short your piston is (by a stuff up or not), you can always make an efficient valve by simply tightening or loosening the tube.



Thunderlord, yes mate. I fill and pilot the gun through the ball valve. I had leaking problems with schrader valves and blowguns at high pressures, so I thought I'd kill 2 birds with one stone (wrong thing to say in a spudgun forum....) and get one valve that can do all I want it to.
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Unread postAuthor: Mitchza89 » Tue Jun 10, 2008 8:14 am

Sorry to dump the thread but what does everyone think of this new look for the gun??
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Unread postAuthor: Gippeto » Tue Jun 10, 2008 9:19 am

Hey Mitch.

Aren't you just the prolific one lately? :D

That'll look great, I really like the ergo's!
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Unread postAuthor: Mitchza89 » Tue Jun 10, 2008 9:22 am

:D I do try my best Gippeto. How's you're monster of a Coax going?
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Unread postAuthor: SpudFarm » Tue Jun 10, 2008 10:56 am

nice one mitch!

that is a really good and compact cannon!
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Unread postAuthor: sniper hero » Tue Jun 10, 2008 11:13 am

nice gun I like it
why isn't there a thing to place your foot at the pump?
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coming: semi auto pellet sniper:D
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Unread postAuthor: starman » Tue Jun 10, 2008 11:13 am

Nifty little sawn-off rifle there Mitchza. You don't see poly used very often...nice innovation there.

Good job!
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