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pcp rifle(video )

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: wyz2285 » Tue Jul 19, 2011 7:20 am

ilovefire wrote:this is what iv got so far

wow that´s way better than my already :shock:
I used 0.25g airsoft bbs, I don´t have enough age to buy metal bbs or pellets
Did you machined your partes? I wish I have more tools :(
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 19, 2011 7:28 am

ilovefire wrote:this is what I've got so far


looking good!

If you want I'll have a rummage through my spring box to see if I have something suitable ;)
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Unread postAuthor: ilovefire » Tue Jul 19, 2011 7:37 am

thanks but if yours can put an airsoft bb through both sides of a soup tin you defiantly have a more powerful one :shock:

dont feel so bad, here you need a licence to even buy airsoft :roll:

the only none basic tools i used where a dermal (kinda basic still) and a bench grinder that uses dermal tool bits

jackssmirkingrevenge wrote:looking good!

If you want I'll have a rummage through my spring box to see if I have something suitable ;)


thanks, ill probably end up buying one of those boxes you linked so i should be good
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why make it if it dosent shoot?
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Unread postAuthor: Crna Legija » Tue Jul 19, 2011 7:49 am

ilovefire wrote:the only none basic tools i used where a dermal (kinda basic still) and a bench grinder that uses dermal tool bits


i hate walking by the machine shop at work we have 2 CNC mills 1 CNC radial arm drill/mill and 5 lathes, so close yet so far way, hopefully after a bit they will let me use them(only my second week there).
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Unread postAuthor: wyz2285 » Tue Jul 19, 2011 7:50 am

I will buy one of those box too :) very useful
Here you need a licence for airsoft guns, and I have this type of licence for airsoft and paintball, but you can buy bbs and accessories(scope etc.) without licence :D
Looks like I have to get a bench grinder
ilovefire wrote:thanks but if yours can put an airsoft bb through both sides of a soup tin you defiantly have a more powerful one :shock:
I use 2x400 psi :lol:
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Unread postAuthor: ilovefire » Tue Jul 19, 2011 8:04 am

Crna Legija wrote:i hate walking by the machine shop at work we have 2 CNC mills 1 CNC radial arm drill/mill and 5 lathes, so close yet so far way, hopefully after a bit they will let me use them(only my second week there).


hope they let you use that stuff eventually, would be murder to have walk past that for years knowing you cant use it

wyz2285 wrote:Looks like I have to get a bench grinder


the one your probably thinking of would be helpful but this is the one im talking about
http://www.cmpindustries.com/servlet/th ... DER/Detail

wyz2285 wrote:I use 2x400 psi :lol:


and a larger projectile :wink:
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why make it if it dosent shoot?
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Unread postAuthor: wyz2285 » Tue Jul 19, 2011 8:10 am

1200 dollar for one :shock:
With at money I can buy 2 small lathes :lol:
How did you cut all these holes on the cupper tube?
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Unread postAuthor: ilovefire » Tue Jul 19, 2011 8:19 am

yea my dad uses it for his work.
you mean the slots? i used a dermal tool witha cutting disk, and its only aluminium
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Unread postAuthor: Gippeto » Tue Jul 19, 2011 8:22 am

Both of you guys are doing a HECK of a job! Kudos! 8)

If it's REALLY loud, the valve is likely still open after the bb has left the barrel. This is a sign of too much valve dwell (open time).

If you get that under control, you'll reduce the noise level without a significant power loss. AND....get more shots per charge. :D

Couple things you can look at:

Reduce the mass of the striker.

Decrease the striker spring strength or preload.

Decrease the transfer port diameter. (Flattens and extends the shot string...increase striker spring preload to get the power back)

Increase valve spring strength or preload.

Edit: Forgot to add fill pressure...play with that too. Find the sweet spot. :wink:

Playing with these variables I've increased my shot count from 12 to 19...at no loss in fps or fpe. Still playing with it.
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Last edited by Gippeto on Tue Jul 19, 2011 8:25 am, edited 1 time in total.
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Unread postAuthor: wyz2285 » Tue Jul 19, 2011 8:22 am

Oh ok, in that case I have to find some cheap electric cutter that can does all these slots :)
Yes I have been looking the best combination for the valve, right now I´m satisfied about the results, the noise wasn´t REALLY loud, but loud :D , because of the pressure.
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Unread postAuthor: Gun Freak » Tue Jul 19, 2011 9:52 am

Ilovefire, that looks beautiful so far! Can't wait to see it in action, same goes for you Wyz!
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Unread postAuthor: Mr.Tallahassee » Tue Jul 19, 2011 9:55 am

You may be able to put an adjustment screw on the end of the spring. that would allow full adjustment of the power of your spring. I don't know exactly how you made it so I can't say for sure. Picture of the end behind the spring and where the spring rests?
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Unread postAuthor: wyz2285 » Tue Jul 19, 2011 10:35 am

no I didn´t put a screw, can´t find one that big :)
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Unread postAuthor: Mr.Tallahassee » Tue Jul 19, 2011 10:52 am

Sorry, I meant a bolt. Brains not functioning well this early in the day. :lol: Maybe take a small bolt and thread it into the back and put a washer on the end of it to seat the spring on. It's definitely worth a shot.
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Unread postAuthor: wyz2285 » Tue Jul 19, 2011 1:08 pm

Well I thought that to, but the spring works fine now, so I´m a little bit lazy to redo that part :D
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