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full auto detent

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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Unread postAuthor: Lockednloaded » Sat Dec 04, 2010 6:42 pm

I had the very problem I feared... filling pilot side through a 1/8" paintball QD, I turned on the tank. with the lowest flow, I got a steady popping every second or two, so I turned it up and air just hissed out the pop-off :(

It seems filling chamber side is the only way to fix this

:EDIT:
I figured out the problem! it was the adjustable pop-off, so now with a standard pop-off I'm getting the DAKKA DAKKA I wanted

I do have another question though, what size ball bearings would fit well in 1/2" SCH 80 PVC, 1/2" bearings were too small
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Unread postAuthor: jackssmirkingrevenge » Sun Dec 05, 2010 12:31 am

Sweet, video please!

What's the internal diameter of your barrel?
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Unread postAuthor: Lockednloaded » Sun Dec 05, 2010 12:52 am

I don't have a barrel or feed setup yet, but I would like to use 1/2" bearings. I have yet to find a pipe with an OD close to .5 though...
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Unread postAuthor: Lockednloaded » Sun Dec 05, 2010 6:23 pm

:BUMP:
bumping for pictures of the setup sans loading mech, the "barrel" currently attached is filled mainly with steel wool and acts as a silencer to quiet the DAKKA DAKKA. I feed un-regged CO2 through the small QD at the bottom of the tee

Image

Who woulda thought that a full auto gun could be cheaper than a semi auto? It turns out this way because I didn't have to buy a DCV, a paintball regulator, or an air ram (I know an air-ram is not a must, but I would've built a semi with one)
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Unread postAuthor: Gun Freak » Sun Dec 05, 2010 6:34 pm

Wow... Looks amazing dude... Is that a schrader on the back? And what pressure pop off it is?
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Unread postAuthor: Lockednloaded » Sun Dec 05, 2010 7:01 pm

Thanks, this is just a preview of whats to come :wink:

The pop-off is set at 125, but I have one set at 90, and another at 200. A quick note of pop-offs: never use adjustable pop-offs for full auto, they don't work. Yes, that is a schrader, I need to get a proper elbow so I can ditch the tee. The schrader is just a plug
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Unread postAuthor: Gun Freak » Sun Dec 05, 2010 7:21 pm

Shame the pilot is so big... You could use a male tee with a regular elbow to the pop off, that could lower the pilot volume a bit... is the 200 psi pop-off standard? Looking forward to the loading mech... :)
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Unread postAuthor: Lockednloaded » Sun Dec 05, 2010 8:00 pm

The pilot volume is teetering one the larger side, but the pop-off has proven its uncanny ability to pilot valves with much larger pilot volumes; larger QEVs, SVs, and even homemade valves. I don't get what you means by "standard" sorry. The loading mech won't be much to look at; a sten style mag and a detent
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Unread postAuthor: jackssmirkingrevenge » Mon Dec 06, 2010 1:00 am

Glad it's working well, and I agree it can afford some cleaning up. A word about pilot volume though, I found that making the pilot volume too small could actually not provide sufficient air for the safety valve to "pop" effectively, so it's not necessarily a bad thing.
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Unread postAuthor: Lockednloaded » Mon Dec 06, 2010 8:50 am

I would like to add a more comfertable trigger, along with a high pressure needle valve. The detent should also be cured tomorrow afternoon, so check in here later for some major progress or epic fail
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Unread postAuthor: Gun Freak » Mon Dec 06, 2010 6:31 pm

Lockednloaded wrote:I don't get what you means by "standard" sorry.

Non-adjustable.
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Unread postAuthor: Lockednloaded » Mon Dec 06, 2010 9:43 pm

The detent failed miserably, I'm looking into other alternatives now. Please give me any ideas or links to good technical examples if you can, thanks
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Unread postAuthor: jackssmirkingrevenge » Tue Dec 07, 2010 1:12 am

How did it fail exactly, multiple feeds?
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Unread postAuthor: Lockednloaded » Tue Dec 07, 2010 8:38 am

It was an adjustable ball detent, but it either double-fed horribly or chopped up paintballs in the breech. I worked on it a while, but I couldn't find a sweet spot[/list]
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Unread postAuthor: Lockednloaded » Wed Dec 08, 2010 10:02 pm

After the failure of the detent, I've thought up a simple BFB. Basically what I've got here is a standard 3/4" CPVC tee, pipe, and male adaptor. The actual BFB os a cast epoxy piston with a 1/2" hole drilled through the center. A screw is put across the hole to both increase SA and to hold the extension spring

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Hope its clear for ya
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