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Paintball Machine Gun, A Few Questions

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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Paintball Machine Gun, A Few Questions

Unread postAuthor: clemsonguy1125 » Wed Jul 07, 2010 7:01 pm

I saw a few posted on Spudfiles the other day and got an idea, it was a paintball machine gun. It was a blow forward breach. It seemed to have some dead space. I drew up a diagram of how it works as I understand. Am I misunderstanding how it works. Also where can I get a saftey pop off valve thats pops at 60 psi. I could not find any reasonably cheap ones on ebay.
[youtube]http://www.youtube.com/watch?v=PYJFysE81_k&feature=player_embedded[/youtube]
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Last edited by clemsonguy1125 on Wed Jul 07, 2010 7:24 pm, edited 1 time in total.
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Unread postAuthor: jackssmirkingrevenge » Wed Jul 07, 2010 7:18 pm

Actually, that's a chopped version of clide's diagram ;)

You need a ball valve between your pop-off and sprinkler valve to use this as a trigger, otherwise it will just fire as you fill it.

Our benevolent sponsor has 10 buck safety valves, 140 psi but I'm quite sure you can take these apart and fiddle with the spring.
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Unread postAuthor: clemsonguy1125 » Wed Jul 07, 2010 7:23 pm

Cool thanks, the ball valve in the back will act as the trigger, I just accidently made it closed when I was drawing the paint pic
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Unread postAuthor: jackssmirkingrevenge » Wed Jul 07, 2010 7:28 pm

clemsonguy1125 wrote:Cool thanks, the ball valve in the back will act as the trigger, I just accidently made it closed when I was drawing the paint pic


I think you should have a valve between the pop-off and the sprinkler, sprinklers need high flows to reset otherwise they will just honk.
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Unread postAuthor: clemsonguy1125 » Wed Jul 07, 2010 7:31 pm

Wouldnt it have the highest flow since theres no valve restricting flow to the breech, and the popoff wont pop till 60 psi.
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Unread postAuthor: jackssmirkingrevenge » Wed Jul 07, 2010 7:45 pm

When you open the "fill valve", the sprinkler valve will not be sealed, the pressure in the "chamber" needs to be at least 15 psi or so before the valve will stop honking, which will make for a pretty awkard firing cycle.

Your best bet is something like this:
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Unread postAuthor: Gun Freak » Wed Jul 07, 2010 7:48 pm

I would replace the pop-off with a modified blowgun-- semi is my taste. This design is definitely on my list...
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Unread postAuthor: clemsonguy1125 » Wed Jul 07, 2010 7:50 pm

Ok cool, so I guess Ill use a 1/4 ball valve for that
http://www.amazon.com/Safety-relief-Val ... 65&sr=1-33
Just found this
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Unread postAuthor: Gun Freak » Wed Jul 07, 2010 7:50 pm

You goin' through with the BFB?
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Unread postAuthor: clemsonguy1125 » Wed Jul 07, 2010 7:52 pm

The what
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Unread postAuthor: Gun Freak » Wed Jul 07, 2010 7:52 pm

Blow Forward Bollt....
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Unread postAuthor: jackssmirkingrevenge » Wed Jul 07, 2010 7:53 pm

Blow Forward Bolt ;)
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Unread postAuthor: clemsonguy1125 » Wed Jul 07, 2010 7:54 pm

Yeah why, it looks like a simple build, if I end up building it Ill use it, right now the price is like 50 something bucks so i may need to find so better deals
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Unread postAuthor: Gun Freak » Wed Jul 07, 2010 7:54 pm

Beat ya to it :D But to be fair, I was too lazy to bolden the first letters :P

@CG1125 just askin' cause I never go through with any of my builds LMAO :D but yeah, 50 bucks ain't a lot at all, but for such a simple concept I'm sure the cost could be lowered.
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Unread postAuthor: clemsonguy1125 » Wed Jul 07, 2010 7:56 pm

I was talkin to spudtyrannt and he said the valve would honk even with the BV before the pop off
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