Semi-auto valve for under $20
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Goats spudz
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This design, the bolt handle is attached to a tube inside the Aluminium and the light gray part is milled out of the aluminium rod and the slot in front of the bolt is where the ammo goes. (i already have the materials)
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Where's my Chuck key?
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Gun Freak
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Wow jsr... Those marble machines were incredible... Thanks for posting that, I really enjoyed it.
OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
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jackssmirkingrevenge
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Reminded me ofthis, brilliant movie.Gun Freak wrote:Wow jsr... Those marble machines were incredible... Thanks for posting that, I really enjoyed it.
Goats, If you make the parts separately it really doesn't identify it as a launcher part...
hectmarr wrote:You have to make many weapons, because this field is long and short life
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Gun Freak
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I like this screenshot. 
OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
just ordered me 2 of these QEVs and 2 slide valves... gonna use one set as a pilot for a barrel sealing piston valve (inside a 3/4" nipple, fairly small so I'm thinking it'll pilot it fine..
other set will sit around until inspiration strikes.
hope these puppies can handle 800 PSI....
other set will sit around until inspiration strikes.
hope these puppies can handle 800 PSI....
"Some say his pet elephant is pink, and that he has no understanding of "PG rated forum". All we know is, he's called JSR. "
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jackssmirkingrevenge
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My only concern would be the rubber piston/diaphragm/thingy.JDP12 wrote:hope these puppies can handle 800 PSI....
hectmarr wrote:You have to make many weapons, because this field is long and short life
already thinkin bout that.. you said you replaced it with a thin delrin washer to try full auto. so i'm thinkin of tryin to make a steel washer/rubber combo to deal with the rubber diaphragm..
what do you think?
what do you think?
"Some say his pet elephant is pink, and that he has no understanding of "PG rated forum". All we know is, he's called JSR. "
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jackssmirkingrevenge
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No need for steel, HDPE or delrin should be fine. My delrin only piston leaked at 110 psi, it might not at 800 but I would put a rubber sealing face just in case.
hectmarr wrote:You have to make many weapons, because this field is long and short life
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AircannonSweden
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Is it good flow in the valve???
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jackssmirkingrevenge
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Yes - but it depends for what you want it exactly.
Marbles, airsoft BBs etc - perfect.
Golfballs, Tennisballs - not so much.
Marbles, airsoft BBs etc - perfect.
Golfballs, Tennisballs - not so much.
hectmarr wrote:You have to make many weapons, because this field is long and short life
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AircannonSweden
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Okey,i think i shuold use paintballs or BBs
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jackssmirkingrevenge
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In response to some questions about the sort of power available to this setup, I hooked up a 12 inch 6mm barrel and did some chrony testing at 120 psi. The firing chamber volume is around 3.5 cubic inches, a little wasteful but that's what I had 
Using 0.25g airsoft BBs, I got an average velocity of 590 fps, more than enough to punch through a soup tin. With some adapted 1 gram 0.22" pellets I got an average of 355 feet per second, fairly decent.
In short, even at relatively low pressures with a relatively short barrel, this valve setup packs quite a punch. For say a field legal airsoft sniper, if you fit a longer barrel you could get away with much, much less pressure, a regulated main chamber would last a long time.
Conversely, increasing barrel length and/or calibre, and upping the pressure, you have enough power available to do some serious damage. I might do some testing with steel BBs and marbles down the line.
Some photos, my test setup with Combro CB-625 chrony at the end of the barrel, and a mangled soup tin.
Using 0.25g airsoft BBs, I got an average velocity of 590 fps, more than enough to punch through a soup tin. With some adapted 1 gram 0.22" pellets I got an average of 355 feet per second, fairly decent.
In short, even at relatively low pressures with a relatively short barrel, this valve setup packs quite a punch. For say a field legal airsoft sniper, if you fit a longer barrel you could get away with much, much less pressure, a regulated main chamber would last a long time.
Conversely, increasing barrel length and/or calibre, and upping the pressure, you have enough power available to do some serious damage. I might do some testing with steel BBs and marbles down the line.
Some photos, my test setup with Combro CB-625 chrony at the end of the barrel, and a mangled soup tin.
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- All penetration with 0.25 gram airsoft BBs
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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killerbanjo
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Thanks for this jack, i have all the parts i need to make this and a full auto but need to get my fridge compresser working 
Please help :V
Please help :V