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QEV+popoff experiment - update: NOW WITH AMMO!

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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Unread postAuthor: jackssmirkingrevenge » Sat Apr 04, 2009 9:56 am

Brian the brain wrote:but marbles aren't uniform...


Sort them :)
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Unread postAuthor: Brian the brain » Sat Apr 04, 2009 9:58 am

shoot em all and let god sort em out
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Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: POLAND_SPUD » Sat Apr 04, 2009 11:00 am

before you decide to choose marbles make sure that the brand that you can buy fits in the barrell with no problems.... in some of the packs I bought only 40 - 60% can be used...the rest was just to big...

I wasn't quite aware of that at the very beginning as only several of them per pack were oversized but now it's simply anoying...

I think I'll switch to different caliber

and trust me... semis eat a lot of ammo so sorting out ammo is going to be a nightmare
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Unread postAuthor: SPG » Sat Apr 04, 2009 11:43 am

Is there anyway to use the "lost" air coming out of the pop-off? Could it be used for instance to cycle a spring loaded bolt?

AND If you want to sort marbles make a sorting tray. You'll just need a bit of plywood with holes drilled in to the same size as your barrel, four edges round it and then pour the marbles in and gentle shake the tray, the one's the drop through are good then one's that don't you do somethin else with.
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Unread postAuthor: psycix » Sat Apr 04, 2009 2:38 pm

SPG wrote:Is there anyway to use the "lost" air coming out of the pop-off? Could it be used for instance to cycle a spring loaded bolt?

AND If you want to sort marbles make a sorting tray. You'll just need a bit of plywood with holes drilled in to the same size as your barrel, four edges round it and then pour the marbles in and gentle shake the tray, the one's the drop through are good then one's that don't you do somethin else with.

That would have a negative influence on the valve's opening time.

Hmm you guys are right, the marble problem isnt that much of an issue with a single shot gun. But semi auto will be a PITA. Also, marbles tend to break while metal bb's can be picked up by a magnet and reused.
I think I'll go for the bb's first, and later on try marbles.
Thanks for your opinions and advice.
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Unread postAuthor: SPG » Sat Apr 04, 2009 2:46 pm

psycix wrote:That would have a negative influence on the valve's opening time.


For sure, but how much of one? If it only dropped the ROF a small amount but gave you a working bolt, it'd be worth it.
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Unread postAuthor: psycix » Sat Apr 04, 2009 2:54 pm

My next design may have the piston connected to the bolt, so its valve and loading mech. in one.

When I DO build a BFWB for marbles, I will indeed need to build a sorter. Tolerances would be tight though.
Some marbles fit in one barrel but not in the other. Difference no more then 1/10th mm.
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Unread postAuthor: SubsonicSpud » Tue Apr 07, 2009 7:40 am

How about making some batches of lead slugs? Make up a mould up out of two thick strips of aluminium so you can do say 5-10 in each cast. Old car batteries are an easy source of lead, and people are always getting rid of them. It is a bit of work to set up, but you would get some nice dense uniform projectiles
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Unread postAuthor: POLAND_SPUD » Tue Apr 07, 2009 8:48 am

@psycix
Some marbles fit in one barrel but not in the other. Difference no more then 1/10th mm.
something tells me that the easest way to overcome this problem is to buy a larger barrel (ID of 16.05 - 16.1)

How about making some batches of lead slugs
if he kept 10 imigrants in his basement and forced tham to cast slugs for him that would be a pretty good idea...

(hint hint it's a waste of time) :wink:
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Unread postAuthor: psycix » Tue Apr 07, 2009 11:00 am

POLAND_SPUD wrote:something tells me that the easest way to overcome this problem is to buy a larger barrel (ID of 16.05 - 16.1)
<snip>
if he kept 10 imigrants in his basement and forced tham to cast slugs for him that would be a pretty good idea...

Where? At the barrel store?
Besides the ID being nice for marbles, another great thing of this particular pipe is that it can be threaded with 1/2" BSP, thus directly screwing into my QEV.
-----
I dont think my parents would allow that, but I'll keep it in mind.
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Unread postAuthor: Brian the brain » Tue Apr 07, 2009 11:04 am

And...if all goes as planned, they can soon be rifled too... :D
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: AdiabaticManiak » Tue Apr 07, 2009 3:23 pm

now this is both inspiring, disturbing and beautiful.

Inspiring; since I´ve thought of full auto guns myself, and this gives me some good ideas.

disturbing; since it´s so well performed and your Dutch ( ;))

beautiful; Well, any true spud gunner can identify the beauty in this one!
Great job.

Now to my improvements thoughts. Getting yourself a good body/stock to rest against your shoulder would greatly increase the (obviously nice) kick-back experience from the full auto-cycles. And put a lot to the esthetically.

again; nice job!
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Unread postAuthor: jackssmirkingrevenge » Wed Apr 08, 2009 12:30 am

psycix wrote:Where? At the barrel store?


hehe reminds me of a radio advert we had some time ago.

"Wicked billiard stick dude, where did you get it from?"

"The Billiard Shop"

...

:roll:

Did you try some single-shot marbles yet?
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Unread postAuthor: psycix » Wed Apr 15, 2009 10:09 am

NEW UPDATE:
Video with ammo!

You want to click this.

:D
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Unread postAuthor: Ragnarok » Wed Apr 15, 2009 10:33 am

Impressive, when it's actually feeding. I suspect some adjustment to avoid the jams will be necessary before it can truly be called a success.
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Does that thing kinda look like a big cat to you?
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