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Build log -- Full-auto 6mm - First Test Shots : FAILURE

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: Hotwired » Sun Aug 24, 2008 1:50 pm

Hehe, nice "Braaaaap" sound on firing :)

Any ammo gone through it yet or has it all been towards getting a working valve system going?
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Unread postAuthor: POLAND_SPUD » Sun Aug 24, 2008 2:12 pm

You held it with your foot?
what's going on on spudfiles....? there are some foot fetishists here?


nice gun.... any chance to see it firing ammo ?
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Unread postAuthor: Leonard » Sun Aug 24, 2008 4:14 pm

Sure, im working on adapting the bolt system on it, as described in the first post of this thread. I'v had the bolt system working on a semi-auto design, sure im positive to get it working on this one.

If some may have been wondering, i get fast burst and slow burst depending on how hard i press on the blow gun. Pretty convenient.

Expect full auto shooting before next sunday!
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Unread postAuthor: ALIHISGREAT » Sun Aug 24, 2008 5:04 pm

as hotwired said, that "baaaarp" sound is very nice :wink:
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Unread postAuthor: Leonard » Mon Aug 25, 2008 9:38 am

When attaching the bolt to the cannon, epoxy alone would not be strong enough.
I had to drill into the rubber piston, screw in a short screw wich would fit in the bolt, fullfill a part of the bolt with epoxy, slide the screw in and spread some more epoxy around it. Im letting in dry for a full 24 hours, i'll see if it works better.
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 25, 2008 10:51 am

ooooh that sounds *very* nice :) very much looking forward to see it actually firing.

I looks like the pop-off-piston combination is one of the best solutions to the constant flow/full auto problem.
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Unread postAuthor: Brian the brain » Mon Aug 25, 2008 11:15 am

Yep. I think so too.
In effect the modded qev and snapvalve do just the same.At higher pressures and lower rps.But I haven't been able to achieve these kinds of results yet.( in theory I'm there) so my hat's off to you!
I now know what to expect.
I'm gonna try and find time tomorrow to finally lathe a well working snapvalve.

A normal QEV an pop-off are slightly different because of the intake placing.This design is another step forward.Slowly we are making progress.





This has been very helpfull.Thanks!
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Unread postAuthor: kablooie » Mon Aug 25, 2008 12:22 pm

Wow, this is very nice, it seems to cycle really well. The fact that you can vary the cycling speed is one of the best parts, because with the pulsed-air bbmg that I made, it would only cycle at two minutely different speeds, and the power was awful. I am looking forward to a video!
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 25, 2008 12:34 pm

Leonard wrote:If some may have been wondering, i get fast burst and slow burst depending on how hard i press on the blow gun. Pretty convenient.


This makes sense as firing depends on the pressure in the pilot chamber reaching the pop-off valve's limit, if you're filling quicker it will obviously actuate quicker. However you might get less power if firing faster as this gives the chamber less time to refill, I would keep a sensibly low rate of fire, less than 5 shots per second, to show cloud BBMGs how it should really be done ;)
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Unread postAuthor: Brian the brain » Mon Aug 25, 2008 1:02 pm

Not if the valve is filled from the chamber side.. :wink:
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 25, 2008 1:08 pm

true, fair enough ;)
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Unread postAuthor: Brian the brain » Mon Aug 25, 2008 1:19 pm

kay then....


Great..


I think we should compete and see who can make the best machine gun based off this idea...And really get this idea developped fully..
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Unread postAuthor: Tom » Mon Aug 25, 2008 2:05 pm

Brian the brain wrote:kay then....


Great..


I think we should compete and see who can make the best machine gun based off this idea...And really get this idea developped fully..


And maybe maybe pay a little bit of attention to the look of the gun :D
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Unread postAuthor: vovka351 » Mon Aug 25, 2008 2:15 pm

very niceley done...
what do you use for 6mm barrel?
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Unread postAuthor: Sticky_Tape » Mon Aug 25, 2008 2:25 pm

Do you think this has any chance against brand name bbmgs? maybe you should sell these plans to them for some $. it would definently be good for compact guns.
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You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
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