| What do you think? |
| Crazy!! I want one! |
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52% |
[ 12 ] |
| Ehh, its O.K. |
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4% |
[ 1 ] |
| You just stole from Clide! No innovation! |
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43% |
[ 10 ] |
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| Total Votes : 23 |
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| Hailfire753 |
 Posted: 12/05/2007 19:18 PM Post subject: |
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Captain
Joined: 28 Jun 2007
Posts: 322
2.90 Spud Bux
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Y'know, I am kinda overcomplicating things by going homemade, but I originally made this thread to display my ideas and collect new ones to build a paintball gun from scratch. I bumped this thread to show a new variant of a recently designed valve.
Part of the reason for this insead of a QEV is the ability to switch between a dedictated auto and dedicated semi-auto modes. Not if-you-pull-the-trigger-fast semi. To be field legal, the gun almost always must have a dedicated semi mode. For home use, or the occasional cheating, I want a full auto gun. In theory this gun would achive a rate of fire greater than 20 bps, faster than the 300 $ tippmann A-5 with e-grip. The DSH valve fires as fast as the hammer can cycle (jack-hammer FAST!) and as fast as the helix mag can load (25-40 bps)
I could use a QEV, as pnuematic-electric markers work (I think?) but there has to be a reason why most paintball guns use hammer valves (besides cost) instead.
I am rather un-knowlagable about QEVs, although I have read the wiki. I assume that QEVs have a fast enough fill and resealing rate for 10 bps?
@ DYI - | DYI wrote: | | You would need ghetto construction techniques the equal of JSR's to pull this off with epoxy and hardware store materials. | Well, that IS the plan. I may not succeed, but I can try.  |
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| VH_man |
| Posted: 12/05/2007 19:50 PM Post subject: |
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Swimmaman
Joined: 09 Dec 2006
Posts: 1532
168.49 Spud Bux
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haha yes they can fill/actuate as fast as you want. and to make it full auto, simply add a blowgun and a 125psi pop valve to your pilot assembely. search around and you can see how this works.
if i were you, i would just put a two way ball valve in place. one that goes to the slide valve, another that goes to the saftey pop valve/blowgun. yay select fire!!!!
plus, im pretty sure that at 125 PSI your QEV will propel a paintball well past legal limits. more like 50 PSI is going to be your operating pressure. not only will it be more quiet, your CO2 will last a LONGGGGG time.........
EDIT: btw i should proboably mention a QEV can be piloted by something as small as a schrader and still have extreme power. in fact, a problem with some QEV launchers is that the removal of the bike pump nozzle causes the gun to fire.....
EDIT2: Why not use a hammer valve to actuate the QEV and use the pilot volume to re-cock the hammer valve? i mean, a QEV pilots at nearly a 5psi difference in pilot volume. with a constant airflow to the back of a QEV, if you open up a modified-blowgun sized hole in the thing fast enough it will open undoubtebly, in wich then this air could re-set your hammer. aghhh i might have to draw this up this it too good to pass up.....
EDIT3:my god im editing this alot. here is how to get full-auto with a QEV. remember your most likely going to have an even SMALLER pilot volume than this gun....
http://www.spudfiles.com/forums/viewtopic.php?t=4108& |
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| Hailfire753 |
| Posted: 12/05/2007 20:18 PM Post subject: |
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Captain
Joined: 28 Jun 2007
Posts: 322
2.90 Spud Bux
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Wow, I seriously never thought of that! Nice idea, I might use it. I think I get what you are saying about the hammer/QEV setup, but a pic would help. And Thanks for the link.
What is the cost of a 3/8 or 3/4 QEV? 50$-75$? links? |
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| VH_man |
| Posted: 12/05/2007 20:49 PM Post subject: |
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Swimmaman
Joined: 09 Dec 2006
Posts: 1532
168.49 Spud Bux
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at mcmaster a 3/8 inch QEV cost like 15 bucks.........
ill draw the picture up on AUTOCAD because after using it for so long i cant stand using paint for diagrams |
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| Hailfire753 |
| Posted: 12/05/2007 20:56 PM Post subject: |
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Captain
Joined: 28 Jun 2007
Posts: 322
2.90 Spud Bux
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| Wow, are you serious? I was under the impression that they cost a whole lot more. I think I will research QEVs more |
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| jackssmirkingrevenge |
| Posted: 12/05/2007 22:19 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 7050
11306.91 Spud Bux
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| DYI wrote: | | You would need ghetto construction techniques the equal of JSR's to pull this off with epoxy and hardware store materials. |
I'm hurt *sniffle*
but you do have a point |
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| Ragnarok |
| Posted: 12/05/2007 22:36 PM Post subject: |
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Lord of Karma
Joined: 19 Dec 2006
Posts: 2629
7172.77 Spud Bux
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| JSR, no-one but you could create a launcher from nothing but a few offcuts, half a schrader valve and a few ounces of epoxy... |
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| jackssmirkingrevenge |
| Posted: 12/05/2007 23:46 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 7050
11306.91 Spud Bux
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Thanks, but sometimes it's a bit of a bad attitude to have - in the sense that many times, instead of coming up with something then buying the bits I need, I tend to look at what I have first and see what I can make with it, hence the ghetto look  |
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| Tom |
| Posted: 12/06/2007 11:06 AM Post subject: |
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Sergeant Major
Joined: 24 Aug 2007
Posts: 188
69.64 Spud Bux
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I think i will make a valve similar to this one, a bit simpler because I don't need a semi-automatic one . I'm trying to make a very small valve in length so their wont be much air wasted. Hmm maybe a bolt action .50 caliber sniper
Tom |
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| Ragnarok |
| Posted: 12/06/2007 14:25 PM Post subject: |
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Lord of Karma
Joined: 19 Dec 2006
Posts: 2629
7172.77 Spud Bux
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| jackssmirkingrevenge wrote: | | Thanks, but sometimes it's a bit of a bad attitude to have - in the sense that many times, instead of coming up with something then buying the bits I need, I tend to look at what I have first and see what I can make with it, hence the ghetto look |
I tend to come up with a design, change it, then add something, then review it, decide it's pretty good and go and work out a budget, then find that half the pieces are highly expensive or don't even exist, change the design around that, see something someone else did, make more changes, find it's prohibitively expensive, redesign down to a more sensible budget, then get a different idea and start the process all over again.
And that's in between trying to decide what facts about myself will go in this weeks s(t)ig... things that are (sort of) true, but interesting. |
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| jackssmirkingrevenge |
| Posted: 12/06/2007 16:07 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 7050
11306.91 Spud Bux
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On that note vageuly related note, Chuck Norris can burn ants with a magnifying glass - AT NIGHT!
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| Hailfire753 |
| Posted: 12/06/2007 16:14 PM Post subject: |
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Captain
Joined: 28 Jun 2007
Posts: 322
2.90 Spud Bux
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| Ragnarok wrote: |
I tend to come up with a design, change it, then add something, then review it, decide it's pretty good and go and work out a budget, then find that half the pieces are highly expensive or don't even exist, change the design around that, see something someone else did, make more changes, find it's prohibitively expensive, redesign down to a more sensible budget, then get a different idea and start the process all over again. |
 Wow, that is exactly what happened here, and in most of my plans.
Also, nice sig. |
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| ALIHISGREAT |
| Posted: 12/06/2007 16:41 PM Post subject: |
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Eternal Noob
Joined: 25 Aug 2007
Posts: 1313
1009.27 Spud Bux
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| its a bit random but i was looking at your updated plans and i noticed you plan to use pvc for the barrel. as this will be a sniper i think you should use a proper paintball barrel. I'm not sure how you could attach it and make it work with the feed and blow foreward bolt but i will have a think and try and figure out a way. |
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| ShowNoMercy |
| Posted: 12/06/2007 16:43 PM Post subject: |
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Brigadier General
Joined: 19 Mar 2007
Posts: 1119
40.29 Spud Bux
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| Were is the logic with that? A paintball barrel wont take advantage of the properties of the gun. |
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| iknowmy3tables |
| Posted: 12/06/2007 17:03 PM Post subject: |
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Brigadier General
Joined: 15 Dec 2006
Posts: 1133
2685.49 Spud Bux
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were trying to point you twords more conventional and effective designs like mark's marble mg, only with a blowforward or blowback bolt
http://www.spudfiles.com/forums/full-auto-marble-gun-t4108.html
theres also bcpneumatics' full auto that uses a a sprinkler valve automatically fired by a pressure switch
edit: well it would be more stable since pvc barrels bend but not long enough for homemades you might want to reinforce the barrel with a wooden support or possibly 3/4" sdr21 pvc which should sleeve 3/4"cpvc |
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