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BFG #7

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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Re: Semi automatic ideas?

Unread postAuthor: farcticox1 » Tue Mar 07, 2017 4:46 pm

Not much progress lately with the weather keeping me out of the workshop, but finished the hand/barrel guard at work, 1 1/2" ABS over 1"

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Might leave the barrel cover white, might look kinda neat. :shock:
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Re: Semi automatic ideas?

Unread postAuthor: Anatine Duo » Thu Mar 09, 2017 7:40 am

Very professional looking...

You are making me ashamed of the epoxy and paint and scrap on mine ;)
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Re: Semi automatic ideas?

Unread postAuthor: jackssmirkingrevenge » Thu Mar 09, 2017 10:25 am

As I always say "pretty is as pretty does", though it has to be said that is some fine craftsmanship on farticox1's part.
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Re: Semi automatic ideas?

Unread postAuthor: farcticox1 » Thu Mar 09, 2017 7:42 pm

They are easy to make, just wrapped around a paper template and started drilling. The spacers at the ends where more tricky.

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Re: BFG #7

Unread postAuthor: farcticox1 » Sun Apr 09, 2017 2:11 pm

Finally got into the workshop for a bit, first test fire of BFG #7, had to mod the main valve as I didn't realize it needed pilot air from the P port and I'm back feeding it through an exhaust port :shock: , and I need a decent compressor. You can hear the 10mm ball bearing bounce off the steel plate after it went through the foam and bounced off the wooden box :shock:

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Re: BFG #7

Unread postAuthor: WizardNoodle » Sun Apr 09, 2017 2:37 pm

Even from the audio, the ringing of the steel plate hurts my ears. And 200 psi per shot, regenerating in less than a second?? And all those wires and hoses and gadgety stuff... I thought hybrids were complicated! Congrats on a successful first fire! Now you just need to make it fully automatic. Bttttttttttttttttttting
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Last edited by WizardNoodle on Sun Apr 09, 2017 2:48 pm, edited 1 time in total.
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Re: BFG #7

Unread postAuthor: farcticox1 » Sun Apr 09, 2017 2:47 pm

that was 80psi, would like to take it up to 125 when I get a bigger compressor.
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Re: BFG #7

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Re: BFG #7

Unread postAuthor: WizardNoodle » Sun Apr 09, 2017 4:29 pm

farcticox1 wrote:that was 80psi, would like to take it up to 125 when I get a bigger compressor.


My bad but still awesome! And what does BFG stand for? My guess is big fckin gun, am I right? And if so holy crap #7??!
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Re: BFG #7

Unread postAuthor: farcticox1 » Sun Apr 09, 2017 4:52 pm

lol yes, and #7 cause I had at least 6 designs before I got this far.
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Re: BFG #7

Unread postAuthor: farcticox1 » Thu Apr 13, 2017 3:42 pm

Going to make a side loading magazine as well for #7, sort of this style

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One piece of scrap 10mm aluminum

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A bit later

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Re: BFG #7

Unread postAuthor: farcticox1 » Mon Apr 17, 2017 4:55 pm

top plate and bottom plate finished, that slot was a pain, much filing :shock: hopefully should hold 10 rounds when it's finished

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Re: BFG #7

Unread postAuthor: jackssmirkingrevenge » Mon Apr 17, 2017 8:42 pm

What you lack in tools you make up in effort and it looks fantastic!
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Re: BFG #7

Unread postAuthor: farcticox1 » Tue Apr 18, 2017 3:33 pm

I went a bit crazy with this part, but aluminium is so nice to work, the balls will sit in the slot and be fed into the barrel opening by a spring loaded arm and a pusher which will follow the radius of the slot, the solid plate covers the bottom of the slot and the keyhole plate will be on top (hole is for loading), well that's how it works in my head. :idea:

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Re: BFG #7

Unread postAuthor: farcticox1 » Wed Apr 19, 2017 3:17 pm

Looks like it might actually work

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Re: BFG #7

Unread postAuthor: farcticox1 » Sat Apr 22, 2017 7:21 am

The final pneumatic circuit, the flow restrictor adjusts cycle time by delaying the opening of the pilot valve which closes the main valve, all the pilot lines are 4mm OD.
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The barrel is connected to the P port mainly because the A B ports are offset and I wanted to keep the barrel on the center line as everything was a tight fit between the side plates.

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And then I discover that the valve needs internal pilot pressure from the P port to close, so had to block the internal port and add external pilot to the end cap :shock:

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