Semi-auto valve for under $20

[Crna Legija]

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.

[stoj]

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

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

[clemsonguy1125]

Jsr, arent those only rated to like 3 psi?

[stoj]

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.

[MrCrowley]

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.

[clemsonguy1125]

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?

[Gun Freak]

It's most likely metal dude...

[clemsonguy1125]

Deleted

[jackssmirkingrevenge]

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.

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?

... 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.

[Lockednloaded]

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?

[mark.f]

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.

[Gun Freak]

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.

[jackssmirkingrevenge]

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.

BTW, how could you see my post?

You needed to remove the space between the url and the [/url] tag.

[Goats spudz]

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

[jackssmirkingrevenge]

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

Simple answer: you don't

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

[youtube][/youtube]