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BFG #7

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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BFG #7

Unread postAuthor: farcticox1 » Sun May 07, 2017 9:47 am

That's right, you know it

airsoft-pellet-guns/topic26444.html

Time to call it finished, compressed air (135 psi) powered, 10mm ball bearing ammo, semi automatic, magazine holds 10 + 1 in ready. The stock is the chamber (1 1/2" pvc), barrel is 1/2" OD seamless stainless tubing (10.2mm ID) 700mm long. Main valve (3/8) is controlled by pilot valve (1/8) pulse, this pulse can be adjusted by the air restrictor to give different times/power. Valves are pilot air actuated 5/2 spring return, but had to add external pilot air to main valve as I was feeding it through an exhaust port not the P port. :shock:
Mostly made from scrap aluminium/stainless/pvc, about 200hrs+ work, hand tools and a drill press only, couple of the fittings were Tig welded, but only because I didn't want to buy anything for it. Front grip is a grinder handle :idea:
It is 1070mm/42" overall length, 6.4kg/14lbs in weight.

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air lines.jpg
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Last edited by farcticox1 on Sat Aug 05, 2017 2:42 pm, edited 2 times in total.
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Re: BFG #7

Unread postAuthor: hectmarr » Mon May 08, 2017 10:42 am

A weapon's beauty! Does it work with Co2? I have in mind to make something similar semi-self. I have a "mockup" although the system I'm using is different. Great job, congratulations !! :bounce:
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Re: BFG #7

Unread postAuthor: WizardNoodle » Mon May 08, 2017 2:01 pm

Awesome. What speeds and/or penetrating power do you get?
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Re: BFG #7

Unread postAuthor: farcticox1 » Mon May 08, 2017 5:35 pm

I think Co2 would work just fine, would be portable with a regulated bottle. :idea:

Have only fired it at short range, but will go through 1/2" plywood at 14 feet. :shock:
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Re: BFG #7

Unread postAuthor: Xamllew » Tue May 09, 2017 2:09 am

Honestly this beast makes me think of some sort of experimental german rail gun with all the bright steel. The machine-work is on another level as far as what I've seen around here. Just love the design of that bb magazine and the follower.
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Re: BFG #7

Unread postAuthor: farcticox1 » Sat Aug 05, 2017 1:50 pm

Adding some construction pictures cause I'm adding this link to Youtube. Also adding a video :D



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Re: BFG #7

Unread postAuthor: hectmarr » Sat Aug 05, 2017 7:25 pm

:bounce: He fires his weapon beautifully, and the precision he has is good. I like it. :bounce:
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Re: BFG #7

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Re: BFG #7

Unread postAuthor: jackssmirkingrevenge » Sun Aug 06, 2017 6:18 am

I love it, especially that magazine feed that is simultaneously elegantly simple while unnecessarily complicated :D kudos!
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Re: BFG #7

Unread postAuthor: farcticox1 » Sun Aug 06, 2017 6:26 am

Still not sure about the bipod, I think it needs to pivot slightly, might work on that today. :idea:

That was easy, removed locknut and did a bit of filing to let it swing

bipod mod (1).jpg
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Max swing left or right
bipod mod (3).jpg
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Re: BFG #7

Unread postAuthor: farcticox1 » Sun Nov 05, 2017 3:22 pm

Got the BFG out and gave it a Xmas paint job, brown grips and black barrel now 8)

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Re: BFG #7

Unread postAuthor: Air2theBrain » Wed Nov 15, 2017 4:16 am

Wow! 8)

Such a clean professional build, i noticed there is no qev but a pilot valve?
What are they like compared to a qev?

Love the workmanship, great inspiration thank you. :)
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Re: BFG #7

Unread postAuthor: farcticox1 » Wed Nov 15, 2017 5:35 am

BFG uses a 3/8 air pilot valve about the same flow as a 1/4" QEV, it is a lot more bulky, I mainly used it because I already had it :o

This is my first QEV attempt, 3/8" chineasiem one of Ebay.

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