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Semi/Full Auto Paintball Prototype

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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Semi/Full Auto Paintball Prototype

Unread postAuthor: 1nxtmonster » Fri Oct 18, 2013 10:46 am

A piston valve full auto/semi auto paintball gun. Onboard air tank gets about 15 good shots, but I hope to use a backpack air supply instead. Very bulky and ugly for now, but it's just a proof of concept. Video:

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Screen Shot 2013-10-18 at 11.25.23 AM.png
Last edited by jrrdw on Fri Oct 18, 2013 3:47 pm, edited 1 time in total.
Reason: Fixed video.

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Re: Semi/Full Auto Paintball Prototype

Unread postAuthor: 1nxtmonster » Fri Oct 18, 2013 4:20 pm

@ jrrdw Thanx for fixing the embed problem
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Re: Semi/Full Auto Paintball Prototype

Unread postAuthor: jrrdw » Fri Oct 18, 2013 6:54 pm

Anytime! Will parks allow that at skirmishes?
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Re: Semi/Full Auto Paintball Prototype

Unread postAuthor: 1nxtmonster » Sat Oct 19, 2013 8:03 am

jrrdw wrote:Anytime! Will parks allow that at skirmishes?


Haha probably not, it shoots pretty hard. Guestimating at 400 fps isn??
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Re: Semi/Full Auto Paintball Prototype

Unread postAuthor: jackssmirkingrevenge » Sat Oct 19, 2013 8:21 am

It looks terrible :) but function over form, nicely done!

Is there some kind of blow forward bolt regulating ammo feed or is it a simple tee magazine?
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Re: Semi/Full Auto Paintball Prototype

Unread postAuthor: 1nxtmonster » Sat Oct 19, 2013 8:23 pm

jackssmirkingrevenge wrote:It looks terrible :) but function over form, nicely done!

Is there some kind of blow forward bolt regulating ammo feed or is it a simple tee magazine?


It is quite ugly :)

Just a simple tee feed with a detent to keep paintballs from rolling out the barrel
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Re: Semi/Full Auto Paintball Prototype

Unread postAuthor: mark.f » Sun Oct 20, 2013 5:50 am

Very nice work. So the large air chamber has a "cracked" ball valve between it and the smaller reservoir, which allows the length of pipe right before the tee to fill before each shot?

Also, does the automatic mode work by simply cracking the blowgun valve and allowing the piston to bounce? Or is there a mechanism in the end of the blowgun like here?

Also, there's some DWV at the end of that reservoir. :wink: Just be aware of it and consider rebuilding with safer parts.

EDIT: derp.
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Last edited by mark.f on Sun Oct 20, 2013 9:13 am, edited 1 time in total.
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Re: Semi/Full Auto Paintball Prototype

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Re: Semi/Full Auto Paintball Prototype

Unread postAuthor: bravootome » Sun Oct 20, 2013 9:09 am

1nxtmonster wrote:A piston valve full auto/semi auto paintball gun. Onboard air tank gets about 15 good shots, but I hope to use a backpack air supply instead. Very bulky and ugly for now, but it's just a proof of concept. Video:


and how do you make it semiauto? by relise the pilot and press fast ?
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Re: Semi/Full Auto Paintball Prototype

Unread postAuthor: 1nxtmonster » Sun Oct 20, 2013 1:05 pm

mark.f wrote:Very nice work. So the large air chamber has a "cracked" ball valve between it and the smaller reservoir, which allows the length of pipe right before the tee to fill before each shot?

Also, does the automatic mode work by simply cracking the blowgun valve and allowing the piston to bounce? Or is there a mechanism in the end of the blowgun like here?

Also, there's some DWV at the end of that reservoir. :wink: Just be aware of it and consider rebuilding with safer parts.

EDIT: derp.


The automatic works by the ball valve being "cracked" just enough to fill the secondary chamber, but not enough constantly push the piston back.

Which bit of pipe is the DWV? I thought I got all schedule 40 pipe. Would 70 PSI be a safe zone for the PVC?
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Re: Semi/Full Auto Paintball Prototype

Unread postAuthor: 1nxtmonster » Sun Oct 20, 2013 1:06 pm

bravootome wrote:
and how do you make it semiauto? by relise the pilot and press fast ?


There is a secondary chamber (the gray length of small pipe) and a cracked ball valve that refills that chamber
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Re: Semi/Full Auto Paintball Prototype

Unread postAuthor: Gun Freak » Sun Oct 20, 2013 9:12 pm

Simple, but it works. Nice. I'm actually surprised you got that to operate fully auto. Bet you couldn't do that again :D definitely a concept worth improving on.
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Re: Semi/Full Auto Paintball Prototype

Unread postAuthor: 1nxtmonster » Mon Oct 21, 2013 2:33 pm

Thanks. Didn't expect full auto, but it's a nice bonus!
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Re: Semi/Full Auto Paintball Prototype

Unread postAuthor: dart guy » Tue Oct 22, 2013 3:45 pm

you should make a hopper with some angled pvc
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Re: Semi/Full Auto Paintball Prototype

Unread postAuthor: 1nxtmonster » Tue Oct 22, 2013 7:08 pm

SOme improvements I'm working on:

Backback air supply, trigger where trigger should be, smaller, PVC hopper,
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Re: Semi/Full Auto Paintball Prototype

Unread postAuthor: jackssmirkingrevenge » Wed Oct 23, 2013 7:49 am

If you have a little money to spend, I would consider a 48 cu paintball tank and regulator for a much more compact setup. It should cost less than $200 to set it up.
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