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PCP building blog

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 » Wed Feb 22, 2012 3:15 pm

Update: finished new valve working :D
Video: [youtube]http://www.youtube.com/watch?v=izf6bExGgFg&lc=Jjyqz5vPs4LsaA1dybTQaGcVzs85YudcCcjVbSGm9J4&feature=inbox[/youtube]
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: killerbanjo » Wed Feb 22, 2012 6:02 pm

Wow thats really smart! The stem from a blowgun?
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Unread postAuthor: wyz2285 » Wed Feb 22, 2012 6:25 pm

First I wanted to use a blowgun stem, but it's too short, so I machined it out of a m4 screw.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: Cosmic Muffin » Thu Feb 23, 2012 11:12 pm

Thats an awesome project you have there. Nice clean build. What sort of rifle will it resemble upon completion or are you have you designed something new?
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Unread postAuthor: wyz2285 » Fri Feb 24, 2012 6:29 am

6mm airsoft sniper rifle, just a simple clean PCP.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: Gun Freak » Sat Feb 25, 2012 10:42 am

Just need to add a barrel...
[youtube]http://www.youtube.com/watch?v=rlhcAqBLUwI[/youtube]

There is black stuff coming out of my quick connect... I think it's oil... Is that bad?
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Unread postAuthor: Brian the brain » Sat Feb 25, 2012 10:51 am

I assume you keep the fridgecompressor oiled up..
Both for lubrication and cooling..

So that's where the oil comes from.


LOL...The only dieseleffect I can be 100% sure about is my old fridgy dieseling at about 60 bar...

:D

Both PCP's are coming along nicely!
You guys just need to polish them...

:wink:
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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: Gun Freak » Sat Feb 25, 2012 11:31 am

Ok I was just wondering if it was supposed to spit oil out when I disconnect the air line :lol:

All I need is a barrel sleeve, I already have the tightbore barrel... :)
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Unread postAuthor: POLAND_SPUD » Sat Feb 25, 2012 2:25 pm

damn it's nice...
but don't you think you need a stronger spring?


I think it's oil... Is that bad
it's 100% normal... you can build a high pressure air filter that will stop almost all oil and also some water
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Unread postAuthor: jackssmirkingrevenge » Sat Feb 25, 2012 2:29 pm

POLAND_SPUD wrote:but don't you think you need a stronger spring?


Yup, sounds pretty weak... but still, very nice effort :)
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Unread postAuthor: wyz2285 » Sat Feb 25, 2012 2:53 pm

From the pressure drop, the shots should be ok...
So you used a rotating hammer after all :D
Any idea about the stock?
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: Gun Freak » Sat Feb 25, 2012 3:06 pm

Yep, rotating hammer FTW!!! :D but yes the spring is very weak so I'm adding another extention spring, a stronger one, in addition to this one. The sound is very deceiving though. It is pretty loud and it lets out a nice thump of air, but it will only open the valve enough at 300 psi. I want to use 400 psi, so I'm putting the extra spring.

Eventually I may get a higher psi gauge so I can use ~600 psi... But that's eventually. I'm not sure I trust soldered copper :roll:

For the stock... Probably something simple that I'll make from PVC, and I'll attach it using the machine screws sticking out of the handle.

Thanks for the input on the compressor, guys. One more question— when I use a pressurized input on my fridgy, it sounds like the input air fills a large volume. Is all that pressure going on the inside of the compressor shell?
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Unread postAuthor: POLAND_SPUD » Sat Feb 25, 2012 4:23 pm

Is all that pressure going on the inside of the compressor shell?
yes, that's right
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Unread postAuthor: Gun Freak » Sat Feb 25, 2012 4:34 pm

Oh I didn't know that :shock: how much is safe to use? I've been using 40...
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Unread postAuthor: POLAND_SPUD » Sat Feb 25, 2012 4:51 pm

most fridge compressors have pressure rating stamped/printed somewhere on them - that's exactly the reason why (because the case is normally exposed to pressure from te circuit)
most of those that I've seen are rated to ~20 bar so you should be fine with 40 or even 100 psi
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