Semi-auto valve for under $20

A place for general potato gun questions and discussions.
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Crna Legija
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Wed Nov 30, 2011 1:40 am

My marble cal semi with same set up can put 16mm glass marbles though 1/2'' pine board, still fly 3ish meters and go half way into my fence 2 by 4s and if i shoot at steel plate the marble become sand.

Thats with a 36cc firing tank at 600psi and a 650mm barrel.
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stoj
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Wed Nov 30, 2011 6:05 pm

My parts came in the other week...I can't wait to assemble it. :) I got 5 slides for around 35 AUSD, and I've got most of my other parts waiting for assembly. It's basically just going to the local plumbing store and getting all the fittings :D

fyi, links to my qev and slide;

http://www.ebay.com.au/itm/Metal-1-4PT- ... 589091d92b

http://www.ebay.com.au/itm/FIRSTINFO-5- ... 414abfcc52
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clemsonguy1125
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Wed Nov 30, 2011 7:20 pm

Jsr, arent those only rated to like 3 psi?
That is all.
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stoj
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Wed Nov 30, 2011 7:47 pm

clemsonguy1125 wrote:Jsr, arent those only rated to like 3 psi?
That's what I thought when I looked at those qevs, but i found ones rated at 90 (see posted above).

Not sure about the slide however.
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MrCrowley
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Wed Nov 30, 2011 8:23 pm

clemsonguy1125 wrote:Jsr, arent those only rated to like 3 psi?
What's going to fail? They're pretty simple, especially the QEV. Anything made of metal like that should be able to take a few hundred PSI and the piston shouldn't fail, even if it does it's not the end of the world.
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clemsonguy1125
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Wed Nov 30, 2011 9:02 pm

MrCrowley wrote:
clemsonguy1125 wrote:Jsr, arent those only rated to like 3 psi?
What's going to fail? They're pretty simple, especially the QEV. Anything made of metal like that should be able to take a few hundred PSI and the piston shouldn't fail, even if it does it's not the end of the world.
Is it metal though, looks a bit like plastic to me?
That is all.
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Gun Freak
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Wed Nov 30, 2011 9:05 pm

It's most likely metal dude...
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clemsonguy1125
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Wed Nov 30, 2011 9:34 pm

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Last edited by clemsonguy1125 on Thu Jan 26, 2012 8:30 pm, edited 1 time in total.
That is all.
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jackssmirkingrevenge
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Wed Nov 30, 2011 11:02 pm

clemsonguy1125 wrote:Jsr, arent those only rated to like 3 psi?
Sounds silly I know, but as was pointed out the body is alloy and the piston is a sturdy bit of rubber, I would be comfortable using it at 300 psi at least.
Lockednloaded wrote:Do yall think this is NPT?

http://www.ebay.com/itm/Pneumatic-QE-04 ... 595ea#shId

why cant I see my post, can anyone else see it?
Image

... and to answer your original question, it looks identical to the one I have (Mine is "QE-02", this is "QE-04") except chamber and pilot ports are 1/2" BSP.
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Lockednloaded
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Thu Dec 01, 2011 12:03 am

Thanks JSR, I think I'll just disregard the threads and epoxy a chamber on. Could square steel tubing hold a fair amount of pressure?

BTW, how could you see my post?
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mark.f
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Thu Dec 01, 2011 12:05 am

Lockednloaded wrote:Thanks JSR, I think I'll just disregard the threads and epoxy a chamber on. Could square steel tubing hold a fair amount of pressure?

BTW, how could you see my post?
Be hitting the "quote" button above it... usually works for me.
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Gun Freak
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Thu Dec 01, 2011 12:14 am

Square tubing is generally bad for holding pressure because it puts loads of force on a flat surface and that = bad. Cylindrical pipe holds the pressure much better.
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jackssmirkingrevenge
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Thu Dec 01, 2011 1:30 am

Lockednloaded wrote:Thanks JSR, I think I'll just disregard the threads and epoxy a chamber on. Could square steel tubing hold a fair amount of pressure?
As Gun Freak pointed out, square tubing puts a lot of force on the flat surfaces which in turn places immense stress on the corners. Unless it was exceptionally thick walled section and I was only using low pressure I would not consider it as a chamber.
Lockednloaded wrote:BTW, how could you see my post?
You needed to remove the space between the url and the [/url] tag.
hectmarr wrote:You have to make many weapons, because this field is long and short life
Goats spudz
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Thu Dec 01, 2011 11:21 am

Hey JSR i Have fixed my power issue, now im just wondering, i asked my tech teacher if i could use the lathe and mill and he said yes but how do i explain that i want to make a breech for a rifle :shock:
Where's my Chuck key?
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jackssmirkingrevenge
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Thu Dec 01, 2011 11:34 am

Goats spudz wrote:i asked my tech teacher if i could use the lathe and mill and he said yes but how do i explain that i want to make a breech for a rifle :shock:
Simple answer: you don't :)

Depends on the exact mechanism, you explain you're making a ball dispenser for one of these:

[youtube][/youtube]
hectmarr wrote:You have to make many weapons, because this field is long and short life
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