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First airgun, 40bar/580psi (damage vids) (Updated)

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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First airgun, 40bar/580psi (damage vids) (Updated)

Unread postAuthor: Tobin » Thu May 19, 2011 11:54 am

The updated version:
Image

I have now change the gun a bit:
-I removed the secondary chamber
-Reduced the pilotvolume
-Increased the chamber volume from 340cc to 460cc
-Added a grip and a screen to the gauge.
-Paintjob
-Improved piston


Image


Old version:

Image

This is my first airgun which I got to work fine a few days ago. Previously I made a potato gun but started to make this airgun because of my interest but also because ive got tired of my potatogun's unreliability

The idea then was to build a gun that can used 40 bar, got a 20mm bore and can fire multiple shots without hooking it up to the compressor al the time.

The gun has a 1 1/4 tee as pistonvalve, the piston is 3 cm in diameter and the sealing face has a 20mm opening. I have fired it up to 40 bar.

As you can see in the video, I have two chambers of the gun. The secondary chamber is way too small to fill in the primary now, but in my first prototype, I had a primary chamber of approximately 80cm3. Then I could reload and lost about 4-5bar/ shot. Despite the small chamber the gun was even when the much stronger that I could imagine but i wanted som more power.
The current chamber is about 320cm3 and performing far better. However, the secondary chamber are now useless. I will probably remove it and replace it with a quick connect so that I can link the rifle to a large fire extinguisher through a hose instead.

Things i will do:
replace the secondary chamber
reduced the pilot volume
ad a stock from a old airrifle
maybe a lighter piston, at the moment the piston is made of aluminum.
Some paintjobb.
Move the stupid placed male connect.

The damage video:
[youtube]http://www.youtube.com/watch?v=xkY3oBCA9SI[/youtube]
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Last edited by Tobin on Sat Jun 18, 2011 9:34 am, edited 4 times in total.

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Unread postAuthor: qwerty » Thu May 19, 2011 1:14 pm

Nice gun! very good build quality for a first and i must say, the damage is very impressive. Good penatration on that wood (no jokes please :roll: )
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Unread postAuthor: Tobin » Thu May 19, 2011 1:25 pm

qwerty wrote:Nice gun! very good build quality for a first and i must say, the damage is very impressive. Good penatration on that wood (no jokes please :roll: )


Thanks. When i shot my first nail, at 40 bar, i was stunned because i thought, -Well they will maybe pierce a 15mm piece of plywood if Im lucky. Later it actually pierced 3cm of wood when i fired at only 5 bar!


Btw, how to get a picture of the gun shown left to my topic in the topic thread?
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Unread postAuthor: clemsonguy1125 » Thu May 19, 2011 2:52 pm

Upload it as a thumbnail, there is a option in the uploader. Nice gun.
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Unread postAuthor: Doctore » Thu May 19, 2011 3:02 pm

Nice!!!
I love it.Is it accurate at 40 bar???
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Unread postAuthor: Tobin » Thu May 19, 2011 4:14 pm

Doctore wrote:Nice!!!
I love it.Is it accurate at 40 bar???


Havent tested accuracy yet. Dont know if we can call these kind of guns accuraty. Its rather the projectile that is accurate or not i think? But i shall make a projektile with fins and make some tests some day. Im happy if i can hit a 33cl can at maybe 5-7m.
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Unread postAuthor: urgle the danish cow » Fri May 20, 2011 4:08 pm

nice job especially for a first
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Unread postAuthor: Tobin » Sat May 21, 2011 5:00 am

Just some questions.
How much pressure can the brass fittings safely handle? Is 50 bar safe? I think especially because of my piston. I want to keep the aluminium piston if i will increase the preassure because of its durabillity. But the piston do weight about 50 grams i dont know if that is safe then it slam back at the brass fitting. I do have a small bumper consisting of a 3mm tick layer of melting glue but not more.
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Unread postAuthor: daniel0663 » Thu May 26, 2011 7:16 pm

How much pressure can the brass fittings safely handle? Is 50 bar safe?


Personaly, i would NOT use gas type brass fittings at 50bar. :?
I wouldn't trust it my self. But it has been done before several times.
If you are gonna use it at 50bar, MAKE sure you tighten your fittings firmly all the way.
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JUST WANTED TO KNOW WHICH AIR COMPRESSOR U USE

Unread postAuthor: HACKERZLORD007 » Thu Jun 09, 2011 1:17 am

HEY MATE

I JUST WANTED TO KNOW WHICH AIRCOMPRESSOR U USE BECAUSE MY EMERGENCY AIR COMPRESSOR CAN PUMP US 200 - 300 PSI MAX....MY GUN CAN HOLD A GOOD 600 PSI + BUT I CANT FIND A GOOD AIR COMPRESSOR..SO JUST ASKED...THNX MATE!!

CHEERS
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Re: JUST WANTED TO KNOW WHICH AIR COMPRESSOR U USE

Unread postAuthor: Crna Legija » Thu Jun 09, 2011 1:31 am

HACKERZLORD007 wrote:HEY MATE

I JUST WANTED TO KNOW WHICH AIRCOMPRESSOR U USE BECAUSE MY EMERGENCY AIR COMPRESSOR CAN PUMP US 200 - 300 PSI MAX....MY GUN CAN HOLD A GOOD 600 PSI + BUT I CANT FIND A GOOD AIR COMPRESSOR..SO JUST ASKED...THNX MATE!!

CHEERS



USE THE SEARCH MATE, now if you typed that nicely maybe i could help you
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Unread postAuthor: Copperboy » Thu Jun 09, 2011 4:42 am

Fan va nice! :P

I also wonder what sort of compressor and chambers are used? And how is the breech is designed?
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Re: JUST WANTED TO KNOW WHICH AIR COMPRESSOR U USE

Unread postAuthor: HACKERZLORD007 » Thu Jun 09, 2011 5:39 am

Crna Legija wrote:
HACKERZLORD007 wrote:HEY MATE

I JUST WANTED TO KNOW WHICH AIRCOMPRESSOR U USE BECAUSE MY EMERGENCY AIR COMPRESSOR CAN PUMP US 200 - 300 PSI MAX....MY GUN CAN HOLD A GOOD 600 PSI + BUT I CANT FIND A GOOD AIR COMPRESSOR..SO JUST ASKED...THNX MATE!!

CHEERS



USE THE SEARCH MATE, now if you typed that nicely maybe i could help you


I tried searching google,yahoo and loads of other sites but all i get is heavy duty industrial air compressor!! The one i have is:

http://www.alibaba.com/product-free/216 ... essor.html

It can pump usually to 300 max but it kills the battery so usually i have to limit my shots to 200 psi which sucks....my gun is fully galvenized metal capable of doing 500+ psi but its a pity having a gun which is so capable but lacking the compressor!!!!
Help would be appreciated!

CHEERS!
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HERE IS MY PNEUMATIC AIR GUN....FULLY METALLIC CHAMBER WITH BLACK FINISH.....CAPABLE OF 500+ PSI BUT NEED A GOOD COMPRESSOR

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Unread postAuthor: Crna Legija » Thu Jun 09, 2011 6:33 am

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Unread postAuthor: Tobin » Fri Jun 10, 2011 12:06 pm

Copperboy wrote:Fan va nice! :P

I also wonder what sort of compressor and chambers are used? And how is the breech is designed?


Tackar ;)

The compressor is a fridgecompressor. The chamber did i weld myself to get what i wanted. Found out during the welding that there was very hard to get it air sealed to 40 bar with arc welding. Breech? Do you mean there i load the bullets?
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