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Help Making A QEV - English

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Help Making A QEV - English

Unread postAuthor: evanmcorleytv » Wed Jan 04, 2012 11:04 am

This thread was split and the real author is "max76". It was split because of a language issue.


First off, Welcome to spudfiles!! It's always good to have new members!!

As to your request, we don't like to spoon-feed answers, but you're new, so here are two videos. One explains how to build a QEV, and the other will explain how the QEV works..

HOW TO BUILD:

http://www.youtube.com/watch?v=vmxaI3_S ... plpp_video

HOW A QEV WORKS:

http://www.youtube.com/watch?v=apSA_ny8 ... 3FJGAFbRGM

http://www.youtube.com/watch?v=75O71AHTIr4

http://www.youtube.com/watch?v=kMaK33Cn ... re=related

http://www.youtube.com/watch?v=Qo0SKiXI ... re=related

Edited by jrrdw.
There was so much italian in this thread I split it the best I could.
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Unread postAuthor: Gun Freak » Wed Jan 04, 2012 11:18 am

Not to mention my tutorial cough cough
[youtube]http://www.youtube.com/watch?v=d40gG2hshig[/youtube]
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Unread postAuthor: max76 » Wed Jan 04, 2012 11:28 am

thx guys.Nice.
when I finish I'll get.
the rest of the gun was ready
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Unread postAuthor: wyz2285 » Fri Jan 06, 2012 1:43 pm

Here is my :lol:
[youtube]http://www.youtube.com/watch?v=RTNh9t__5eE[/youtube]
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Unread postAuthor: jackssmirkingrevenge » Fri Jan 06, 2012 2:23 pm

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Unread postAuthor: max76 » Fri Jan 06, 2012 6:33 pm

the spring is used or not?
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Unread postAuthor: jackssmirkingrevenge » Sat Jan 07, 2012 1:30 am

Unless you're pressurising from the chamber side, no real need for a spring.
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Unread postAuthor: max76 » Sat Jan 07, 2012 3:51 am

but when you fire the shot you lose all the air out of the barrel?
I would instead use several times the air of the barrel.
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Unread postAuthor: jackssmirkingrevenge » Sat Jan 07, 2012 4:05 am

For multiple shots with a QEV you have two options:

- use a secondary chamber and a slide valve as a pilot as in my "under $20" example

- use a spring loaded piston in your QEV and a momentary pilot, such as a hammer valve
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Unread postAuthor: max76 » Sat Jan 07, 2012 6:15 am

jackssmirkingrevenge wrote:For multiple shots with a QEV you have two options:

- use a secondary chamber and a slide valve as a pilot as in my "under $20" example

- use a spring loaded piston in your QEV and a momentary pilot, such as a hammer valve


I'd see pictures of the first model and second model? :?
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Unread postAuthor: jackssmirkingrevenge » Sat Jan 07, 2012 6:26 am

max76 wrote:I'd see pictures of the first model and second model? :?


The first one is explained here.

Image

The slide valve is basically a three way valve.

A three way valve has three ports, which we will call A, B and C

There are two possible paths, AB (with C blocked off) and AC (with B blocked off)

A is connected to the pilot area of the piston

B is connected to your 100 litre tank

C is simply left open to the atmosphere.

At rest, the three way is in position AB. This means your reservoir is filling the launcher chamber.

When the trigger is pulled, the valve switches to position AC. This means the reservoir is blocked off, and is no longer filling the pilot and chamber, while the pilot is exhausted to the atmosphere, which fires the launcher.

Once the trigger is released, the valve goes back to AB, refilles the pilot and chamber and the cycle can be repeated.

The second one would be something like this:

Image

When you pull the trigger the valve opens, when you let go it shuts and the spring resets the piston.
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Unread postAuthor: max76 » Sat Jan 07, 2012 6:53 am

complex :(
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Unread postAuthor: Crna Legija » Sat Jan 07, 2012 7:02 am

max76 wrote:complex :(


Well it don't get much simpler then that.
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Unread postAuthor: jackssmirkingrevenge » Sat Jan 07, 2012 8:39 am

max76 wrote:complex :(


again, look at this: http://www.spudfiles.com/forums/semi-au ... 23626.html

For less than $20 you can have a semi-auto system buying standard parts from eBay.
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Unread postAuthor: evanmcorleytv » Sat Jan 07, 2012 10:55 am

max76 wrote:complex :(


lol, not really.. But You'll learn soon enough, nothing to worry about!! Most people here had to learn how this stuff works!! Me included!!
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