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Slide + qev

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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Slide + qev

Unread postAuthor: airheadnoob » Fri Dec 18, 2009 2:55 am

btw jsr no feet :wink:

3 days ago i went to the site http://www.bellpro.net and ordered a 1/2 QEV and Slide valve.
knowing the delivery system in australia i didn't get my hopes up (they said it will arrive in 3 days). i waited 3 days and though "what the hell"
i went to the shops and i passed the post office and went in :D


the lady lifted up a large envelope. all hope lost thinking it would be something else i opened the envelope and there was a box that fit perfectly in my hand. :p

i opened it up and there they were, the qev and slide valve were neatly pack.

i raced home, assembled every thing.

Image
i used it once at 7 psi it yapped releasing a small amount of air.
raising the psi the yapping became louder and louder.
it reached 6 bar i slid the valve back and BARK, i was shocked at the efficiency.
the only thing i could complain about that the connecter where the barrel goes its a 10mm instead of a 1/2" :X

build consists of:
1/2 qev
1/2 slidevalve
1/2 conector
1/2 to 1/4nipple
female quick connect
1/2 to 3/4 nipple
3/4 bsp pipe ( if i swapped to a longer would it be stronger?)
3/4 end cap

Image
air goes in
Image
AIR COMES OUT
Image
the 10mm thread
Image


:D :D :D :D :D :D :D

question:
q1 should i use a 10mm bore or a 8/9 mm bore for a barrel?
i think i should use the 8/9 bore i have screws that fit perfectly.


q2 can the qev go to 20 bar if so how much higher?

q3 any one have a name?

vid :without reservoir
[youtube]http://www.youtube.com/watch?v=MjoamzqKQZg&feature=player_embedded[/youtube]

first few shots at 7-6 bar then 5-0 bar with reservoir so it wasn't as strong.
[youtube]http://www.youtube.com/watch?v=uMxswicqlj8&feature=player_embedded[/youtube]

very satisfied with bellpro

Image
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Last edited by airheadnoob on Sat Dec 19, 2009 7:17 pm, edited 8 times in total.

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Unread postAuthor: psycix » Fri Dec 18, 2009 6:07 am

A QEV+slide valve combo is indeed a very easy way to create a semi-auto valve mechanism. All you need now is a reliable loading mechanism.
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Unread postAuthor: POLAND_SPUD » Fri Dec 18, 2009 8:09 am

All you need now is a reliable loading mechanism
yeah and he could combine the trigger with the loading mech
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Unread postAuthor: airheadnoob » Fri Dec 18, 2009 3:11 pm

yeah im trying to work that out
if you look at the qev's camber that'll be the handle

im trying to work out a trigger mech
im thinking of using a "pre loaded" spring and releasing it with a trigger instead of the spring always pushing the trigger because i don't think i can pull the trigger fast enough :D

oh and the qev has serrated egdes and it cut me like a papper cut :roll: typical :arrow: does any one else get micro cuts on their hand from threads?
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Unread postAuthor: spudamine » Fri Dec 18, 2009 4:28 pm

I've also got a 1/2" slide valve connected to a 1/2" QEV, but of the european variety. I've taken the slide valve to 40 bar but it starts to have trouble at about 20, hard to actuate and quite a lot af air leaks out when you move it forward to refill your chamber, this is the main reason i've given up on this particular combo for now. Use a huge reservoir and keep the pressure down and it should work a treat.
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Re: new semi

Unread postAuthor: moonmaster » Fri Dec 18, 2009 5:14 pm

airheadnoob wrote:btw jsr no feet :wink:
the only thing i could complain about that the connecter where the barrel goes its a 4/8 " instead of a 1/2" :X
very satisfied with bellpro

As far as I know, 4/8 equals 1/2, unless I don't understand something here.
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Unread postAuthor: airheadnoob » Fri Dec 18, 2009 6:32 pm

i ment 3/8 :D lol soz i went out and got the nipple 10mm to 1/2" heehe nice job on the double post XD iv done it before when i was capped


and yeah im going to get a metal canister to be the reservoir a 2L thing iv also found if i dont slide the valve fast enough air leaks out :cry:

iv shot it a couple of times and it strong and accurate, i was shooting 7 m ish and there was a 60 cm spread its cos when i pull the slide valve back i move the whole gun i need a trigger and a scope.

it shot a screw right through a tin can 3 times in a row with a small reservoir
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Unread postAuthor: psycix » Fri Dec 18, 2009 7:30 pm

POLAND_SPUD wrote:
All you need now is a reliable loading mechanism
yeah and he could combine the trigger with the loading mech

Or one that actuates with the pressure, like a blowforward bolt.
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Unread postAuthor: airheadnoob » Sat Dec 19, 2009 3:04 am

update : added two camber i think 3/4" by 10" i got 4 power shots at 11bar .i just need a loading mech and a trigger i thinking about taking it to 20 bar and adding another 3/4" by 10"
Image


oh and some damage pics
total damage
Image
power shot
Image

the can is rusty because i used it as a container for the sodium nitrate i made it had exes sodium hydroxide
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Unread postAuthor: airheadnoob » Sat Dec 19, 2009 4:44 am

sry for double post
but update (better reservoir )
[youtube]http://www.youtube.com/watch?v=cHbjTIiK4wA&feature=player_embedded[/youtube]
[/code]
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Unread postAuthor: qwerty » Sat Dec 19, 2009 4:49 am

How many shots do you get from that tank you are using?
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Unread postAuthor: airheadnoob » Sat Dec 19, 2009 6:08 am

hmmmmm id have to count but its 10pm id have to say 7-10 power shots
:) i have a mini compressor so it takes 1-2 min to charge it

any one suggest a name i was thinning somthing to do with the qev
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Unread postAuthor: psycix » Sat Dec 19, 2009 8:27 am

A name? Well as long as you have to load the ammo manually you can leave out the word "semi"
If you are not planning to make it auto-loading, at least give it a bolt-action breech load.
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Unread postAuthor: airheadnoob » Sat Dec 19, 2009 4:12 pm

heemmmm yeah i hate the muzzle loading im not finished yet i was thinking of using a spring loaded magazine
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Unread postAuthor: PVC Arsenal 17 » Sat Dec 19, 2009 4:48 pm

This is the sort of thing that I appreciate seeing. Very nice setup. Simplicity is your friend.
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