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Design opinion for pneumatic

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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Unread postAuthor: Fish8myb8 » Tue Mar 23, 2010 3:14 pm

Thanks a lot for feedback.

whitexnightjp: yeah, I wanted a shock pump eventually either way to get higher pressures

iknowmy3tables: I don't think I'll be needing one for a while since I don't have any sources of air but my manual pumps

spudtyrrant: This would be around $30 in PVC if not for the ball valves. I have most of the parts for this from my first launcher and a few parts I had before, hopefully that would bring down the cost :[

DR: Then what's the fun of building it on my own? But I might consider those darts...

JSR: I am all aware you are the king of epoxy, but what about that would you have made from epoxy? epoxy failed me a few times in the past..... but I probably did something wrong with it :/


So how about this then? much easier and cheaper. Most expensive parts will be the QEV and the shock pump.


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Unread postAuthor: Brian the brain » Tue Mar 23, 2010 3:43 pm

My Shatterhand cannon cost me very little, just some time to collect suitable parts..doorhandles, springs, piece of hardwood leftover..


Modifying a QEV will give you a powerful multishot cannon with minimum parts.

It involves piercing the piston and putting a spring behind it.
This way it can refill from the chamberside...very, very quickly.

No more need for extra ballvalves, just create your own little pilot-hammervalve, or tap a blowgun for multishot.
Pilot it through a pop-off and you get full auto, with minimum fittings..
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: Fish8myb8 » Tue Mar 23, 2010 3:51 pm

Intriguing, could you give me some links to that please? :)
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Unread postAuthor: POLAND_SPUD » Tue Mar 23, 2010 4:32 pm

...or just buy a 3 way valve :D no need to mod anything
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Unread postAuthor: Fish8myb8 » Tue Mar 23, 2010 4:47 pm

But modding is fun :D
But I don't really understand what either of you mean by what you said :oops:
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Unread postAuthor: POLAND_SPUD » Tue Mar 23, 2010 4:56 pm

well... trust me even if you use a 3 way it is like modding...
:wink:

ok.. so let's start from the very beginning... QEVs are ready-made piston valves that are both filled and piloted through the same port... most ppl two separate valves to do operate them: one to fill and one to pilot the QEV...

though, you can also do it in the proper (filling/piloting such a valve without loosing more air than needed & using only one valve) way with the use of a 3 way valve...
...a thingy that can first pressurise the QEV and the gun, then close off the air supply and vent the pilot side (opening the QEV and sending ammo downrange)...


what BTB suggested is a way of modding the QEV so that it could be filled through the chamber port but piloted through the pilot port (with a BV or a blowgun)... the disadvantage of this method is that you loose some performance and air in the process (unless you use a hammer valve though that increases complexity)

anyway, QEVs were designed to be used with 3 way valves... that should give you a hint
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Unread postAuthor: Fish8myb8 » Tue Mar 23, 2010 5:09 pm

The air fill has to be on the same side as the pilot is???
So then I can't put my schrader on the chamber?
Woaw, I just ordered the parts, too.
Grr.
I can just put a tee on the trigger side of the QEV and thread the schrader into that.
More parts :evil:

But thanks for the explanation.

The exhaust port on the QEV is the barrel, the inlet port is where the pilot+fill is, and outlet is chamber, right?

wait........... you just said I can mod it so that I can fill it through the chamber.

*Rereading :oops: *
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Unread postAuthor: whitexnightjp » Tue Mar 23, 2010 8:00 pm

how did you load in the bbs for that cannon to have such a great grouping?
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Unread postAuthor: Fish8myb8 » Tue Mar 23, 2010 9:12 pm

What bbs? :shock:
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Unread postAuthor: POLAND_SPUD » Tue Mar 23, 2010 9:34 pm

wait........... you just said I can mod it so that I can fill it through the chamber
yeah that's what BTB mentioned.. when you cut a hole in the piston you can fill from the chamber side... that means worse performance but no one know how much worse as no one compared modded and unmodded (AFAIK)...
anyway if you mod it in this way the QEV will stay open as long as the pilot valve is open.. hence the need for a hammer valve to minimize loss of air

I can just put a tee on the trigger side of the QEV and thread the schrader into that.
More parts
yeah that will work... personally I think you'd be better off attaching a BV directly to the pilot side and then a male quick disconnect fitting (it goes without saying that you'll need a female QD too)...
it'll work pretty simple - first connect the air source and open the valve to fill the gun... then close it and disconnect... when you want to fire just open the BV
the biggest advantage of this over putting a T there is reduced pilot volume

The exhaust port on the QEV is the barrel, the inlet port is where the pilot+fill is, and outlet is chamber, right
yeah

What bbs?
it can mean either ball bearings or ammo used for airsoft (6mm and 8mm)... alternatively it can mean those round balls in .177 cal.... Have you ever heard of BB guns ?

No offence, but I think you should spend more time browsing the forum and reading everything you can find... not that I don't want to answer your questions but you'll learn much more by reading things on your own
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Unread postAuthor: whitexnightjp » Wed Mar 24, 2010 2:28 pm

srry i was commenting on jackssmirkingrevenge
With a bit of judicious use of proper epoxy this could easily be built on a budget, what many people don't realise about my launchers is that since I make almost no use of standard parts, at least ones which I actually pay for, the cost comes down a lot.

Take this one for example, if you factor in the cost of the pipe and epoxy and assume the schrader was ripped out of a used bicycle tyre, the total financial outlay was about $10
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Unread postAuthor: jackssmirkingrevenge » Wed Mar 24, 2010 2:36 pm

whitexnightjp wrote:how did you load in the bbs for that cannon to have such a great grouping?


Great grouping? those shots were a couple of metres away, not really sure what sort of accuracy would have resulted further away.
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Unread postAuthor: whitexnightjp » Wed Mar 24, 2010 3:12 pm

oooo didnt see where the cannon was but how did you load thenm in?
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Unread postAuthor: jackssmirkingrevenge » Wed Mar 24, 2010 3:16 pm

I think you've already seen how I make my wads, here. Also since it's a 0.75" barrel 12 gauge shotgun wads can also be used :)
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Unread postAuthor: whitexnightjp » Wed Mar 24, 2010 3:19 pm

wow yeah your right i have but i dont quite understand how to make one :oops:
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