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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: c11man » Fri Oct 16, 2009 10:02 am

so i understand the pics right that is a solid piston now?
you defianly do NOT want solid metal pistons, they are way to heavy and hurt preformace. if you are just using the center section to block that EQ hole just thread the hole and put a set screw in or something. and make the piston hollow again
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Unread postAuthor: Jack_Hogg » Fri Oct 16, 2009 10:32 am

c11man wrote:so i understand the pics right that is a solid piston now?


No the piston is not solid. It's like below:
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Unread postAuthor: psycix » Fri Oct 16, 2009 3:08 pm

When you don't have an o-ring, or a 0,01 of a mm piston fit, you dont need an EQ hole.
Plug it (on the backside)

If you can, remove more material. Or, make a new piston, being hollowed out more, like a tube with two plugs.
I also wonder how the piston fit is. How large is the piston OD and tube's ID?

When turning a piston I keep testing if it fits in the tube the piston will slide in, reducing diameter by tiny bit by bit. First try it out on a small length of rod, and then write down what diameter it was, then make the piston, out of the rest of the rod. That's how I gave BTB's thundervalve its supertight ~1/50th of a mm fit.
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Unread postAuthor: Brian the brain » Fri Oct 16, 2009 4:33 pm

I had to put a " channel " in the side for it to equalize.
Basically scratched the side with a knife. :D
BTW..I supergleud the face and it is SUPER reliable now!!

Best valve I ever had! I like it better than a QEV, has more flow and a personal touch.

Nylon rod makes a much better piston as it is light enough to remain solid.
You can also reduce pilot space by adding a spacer-type ring with a smaller diameter channel through it as I suspect you have too much travel as it is.

Anyway...get a fridgy and see what it does at higher pressures..I'm sure it will get a lot faster with every atmosphere you add.
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Unread postAuthor: Jack_Hogg » Sat Oct 17, 2009 6:09 am

OK, I think I am going to make a whole new piston out of nylon (but that will be after the week vacation), and shoot the old piston away! (off course I will make a video of it) :lol: Anyway, I am going to upload pictures on any update I make. :wink:

Cheers.
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Unread postAuthor: Jack_Hogg » Sat Oct 17, 2009 8:53 am

I have upgraded my male quick connect today. I have solved it with a bigger male quick connect. I have blown thru the handle to see if it really makes a diffrence, and it did. I had way less resistance when I had added the bigger male quick connect. So that's another improvement.

Pictures below:
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Unread postAuthor: qwerty » Sat Oct 17, 2009 9:14 am

looking good! When you make the nylon piston you will see a massive difference in power.
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Unread postAuthor: Jack_Hogg » Thu Oct 22, 2009 11:44 am

Finally got my fridgy working! I pumped it up to 30 bars in 3 minutes. And it makes a very loud bang, and has lots of recoil. The first time tested, I was like :shock: :shock: :shock: :twisted: :twisted: :P :D It's just way easier an more fun to have a fridgy. I love it. I am going to make a handle ontop of my fridgy, and then I am going to post a few pictures.
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Unread postAuthor: psycix » Thu Oct 22, 2009 4:26 pm

Cool, I'm glad to hear you got it working.
I guess its time for damage pics... :wink:
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Unread postAuthor: Jack_Hogg » Fri Oct 23, 2009 9:54 am

Ok, well I have tested my gun to 35 bars and I have to say it's very impressive how much power it has. I have never thought air could have such high power... Damn. I have tested it with a hand full of yellow bb's and here are the results :twisted:
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And here is one with 20 bars:
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So yea.. that's it :) I will offcourse test it with marbles and other projectiles :wink: Damn, I wish I had a high speed camera....

NOTE all the wood was harder wood then normal kinda wood and it was new wood, not rotten.
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Unread postAuthor: psycix » Fri Oct 23, 2009 1:09 pm

Nice!
When shooting marbles, be careful with ricocheting.
I have found that hard targets (metal) are safer then softer targets like soft wood.
Marbles that shatter don't bounce back. I had a marble push itself 2 cm into soft wood and then bounce back into my face....
Put your target at an angle.
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Unread postAuthor: Jack_Hogg » Fri Oct 23, 2009 1:30 pm

I sure will do that. I am VERY careful with that high pressure :wink:
Thanks for the tip though. The bb's I was shooting I had safety glasses with ear protection.

EDIT: I will going to shoot a marble against a old ww2 helmet. Will it go thru? I personally don't think, or maybe it does penetrate? We will see. One thing is for sure, you really don't want to be in the front of the barrel :binky:
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Unread postAuthor: Brian the brain » Fri Oct 23, 2009 4:31 pm

Wow..great buckshot pic.
Love to see it with 4.5 mm lead bb;s... :D


So much for air-SOFT.. :roll:
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Unread postAuthor: Jack_Hogg » Fri Oct 30, 2009 3:36 am

So here are a few updates I made so far:
- Added handle to the fridgecompressor.
- Added 28mm copper barrel.
- Added the sealingface to the barrel.
- Modified the barrelsupport. (I have more of these made)
- Added the setup for my fridgecompressor.

I have to say it has bigger recoil then the 22mm copper barrel, and also a bit more powerful. Thanks to BTB.

Here are the pictures:
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Unread postAuthor: qwerty » Fri Oct 30, 2009 4:08 am

Very nice!, Jack may i ask: are you from England because you are using 22mm and 28mm pipe.
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