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Green gorilla. Diaphragm launcher.

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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Green gorilla. Diaphragm launcher.

Unread postAuthor: 8tonsemi » Fri Jul 27, 2012 9:23 am

This is my newest diaphragm launcher. It's a version 2 of the other one I posted.

Specs. 2inch by 3 foot chamber.
5foot golf ball barrel.
1 1/2 inch diaphragm valve.
1/4 ball valve as pilot.
Quick connect as fill.

Goes through ply wood like foam. I'll have pictures of the gun up soon. Here's the videos of it. Before the paint job.



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Last edited by jrrdw on Thu Nov 07, 2013 3:35 pm, edited 1 time in total.
Reason: Fixed videos.
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Unread postAuthor: PotatoEnemy17 » Tue Aug 14, 2012 8:36 am

For a 1 1/2'' valve your should try a bigger pilot (1/2'' ball valve). Nice gun though.

Actually you could pilot though the quick connect instead...
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Unread postAuthor: mattyzip77 » Tue Aug 14, 2012 8:43 am

PotatoEnemy17 wrote:For a 1 1/2'' valve your should try a bigger pilot (1/2'' ball valve). Nice gun though.

Actually you could pilot though the quick connect instead...


Dude its a not a q e v its a dust collector, the pilot is built into the valve. Dont post if you dont know, it confuses other members..
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Unread postAuthor: PotatoEnemy17 » Tue Aug 14, 2012 9:07 am

mattyzip77 wrote:
PotatoEnemy17 wrote:For a 1 1/2'' valve your should try a bigger pilot (1/2'' ball valve). Nice gun though.

Actually you could pilot though the quick connect instead...


Dude its a not a q e v its a dust collector, the pilot is built into the valve. Dont post if you dont know, it confuses other members..


OK I'm missing something, You can pilot it though a blowgun but not a ball valve? I'm sorry but that makes no sense.
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Unread postAuthor: mattyzip77 » Tue Aug 14, 2012 9:35 am

Not going to make a difference what you use to pilot a pilot. The valve has a pilot built into it.
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Unread postAuthor: Mr.Tallahassee » Tue Aug 14, 2012 3:32 pm

Matty is explaining it wrong. There is a limit to what you can pilot it with. The output from the pilot is 1/8'' NPT so going any bigger than a 1/8'' NPT ball valve will be ineffective and absolutely pointless. The blowgun is actually more than sufficient to pilot the relatively small pilot volume. A larger pilot valve only works to a point.
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Unread postAuthor: PotatoEnemy17 » Tue Aug 14, 2012 5:28 pm

Yeah, but is the blowgun's actual valve have the the same amount of flow as an open 1/8 NPT thread? I doubt it.
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Unread postAuthor: mattyzip77 » Tue Aug 14, 2012 6:27 pm

I wasnt explaining it wrong, just explaining it my way. @ Tallahassee he dont understand the valve.
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