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My first Pneumatic Cannon Showcase... but will it blow

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: jackssmirkingrevenge » Sat Nov 20, 2010 11:58 am

sumisukyo wrote:PLEASE DONT TELL ME IM STUPID PLEASE DONT TELL ME THE SPRING GOES ON TOP !!!!!!!!!
(sorry if theres a all caps rule but seriously dont tell me)


LOL!

The spring is supposed to keep the diaphragm closed :)
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Unread postAuthor: sumisukyo » Sat Nov 20, 2010 1:12 pm

:shock: OW JEEZ :oops: plz get me a diaper or at least a bit of candy for this sulking NOOB
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Unread postAuthor: Technician1002 » Sat Nov 20, 2010 1:14 pm

sumisukyo wrote:PLEASE DONT TELL ME IM STUPID PLEASE


:D

You left yourself wide open.. I can't resist.. :D

OK I won't tell you you are stupid.. We will keep it a secret.
:D

Thanks, I'll be here all week.
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Unread postAuthor: Gaderelguitarist » Sat Nov 20, 2010 4:47 pm

Shocked OW JEEZ Embarassed plz get me a diaper or at least a bit of candy for this sulking NOOB


Nothing to be ashamed of, unless you have any pride.
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so many muchness
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Testing the gun

Unread postAuthor: sumisukyo » Tue Nov 23, 2010 12:07 am

Ok replaced all the parts with metal and placed a safety valve on the tank so I can let them amount of pressure i want into the system.
PS the gun had a tiny leak which u can hear as I turn it on fixed it with epoxy

lol idiot brother held the camera upside down thank god for movie maker or it would be stuck that way XD

[youtube]http://www.youtube.com/watch?v=BU-zn8OB32U&feature=youtube_gdata[/youtube]
ill try and get the sound fixed it happens when I rotate it ??
heres the upside down with sound
[youtube]http://www.youtube.com/watch?v=2e8GEOOZm5g[/youtube]
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Unread postAuthor: jackssmirkingrevenge » Tue Nov 23, 2010 2:18 am

Are you going to add a magazine? A simple tee should suffice, something like this ;)
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Unread postAuthor: Technician1002 » Tue Nov 23, 2010 2:23 am

Listening to the shot, the pilot was open for a long time. Either a larger pilot valve or a smaller EQ leak between the chamber and pilot can improve trigger speed and reduce the amount of chamber pressure lost to the pilot when it is fired.
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Unread postAuthor: sumisukyo » Tue Nov 23, 2010 2:55 am

jackssmirkingrevenge wrote:Are you going to add a magazine? A simple tee should suffice, something like this ;)


:o Ya I will as soon as iv worked out the kinks just looking for regulator at 300 psi with an intake of higher than 1800psi so i can turn the gas on and leave it.:twisted: semi auto here I come

Technician1002 wrote:Listening to the shot, the pilot was open for a long time. Either a larger pilot valve or a smaller EQ leak between the chamber and pilot can improve trigger speed and reduce the amount of chamber pressure lost to the pilot when it is fired.


:shock: OK now in layman's terms. please give me a better description I'm still getting used to the terminology :oops:
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Unread postAuthor: Technician1002 » Tue Nov 23, 2010 3:06 am

In layman's terms you pulled the trigger. The air hissed for a while out the trigger valve before the main valve popped.

Due to the leakage in most pistons between the air storage chamber and the pilot where the trigger is, this allows some of your chamber pressure to bleed off while the trigger is letting out air before the cannon fires.

Reducing the amount of air lost while firing results in higher pressure in the chamber when it does fire.

The two ways to reduce the air lost is to improve the speed of the trigger by using a larger trigger valve and reducing the rate the air can blow from the chamber to the pilot area.

Listen to the video just before the cannon goes off. Notice the long hiss.

Here is the hiss followed by the boom of another cannon.
Image
Using Audacity or other sound editor you can view the sound of your cannon and measure the length of time it hisses before it fires.
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Unread postAuthor: Crna Legija » Tue Nov 23, 2010 8:56 am

Is that your house? its fuken huge
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Unread postAuthor: sumisukyo » Thu Nov 25, 2010 11:12 am

Technician1002 wrote:In layman's terms you pulled the trigger. The air hissed for a while out the trigger valve before the main valve popped.

Due to the leakage in most pistons between the air storage chamber and the pilot where the trigger is, this allows some of your chamber pressure to bleed off while the trigger is letting out air before the cannon fires.

Reducing the amount of air lost while firing results in higher pressure in the chamber when it does fire.

The two ways to reduce the air lost is to improve the speed of the trigger by using a larger trigger valve and reducing the rate the air can blow from the chamber to the pilot area.

Listen to the video just before the cannon goes off. Notice the long hiss.

Here is the hiss followed by the boom of another cannon.
Image
Using Audacity or other sound editor you can view the sound of your cannon and measure the length of time it hisses before it fires.


OWWWWWW no no no as i said just before the video there was a leak through some epoxy fixed it no more hissing :D

Is that your house? its fuken huge


South Africa my friend its 10 rand to the dollar work out how much ur living costs you then times it by ten and thats how I'm living :D, that is why we moved when America offered my dad a job in South Africa.
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Update :D

Unread postAuthor: sumisukyo » Thu Nov 25, 2010 11:26 am

Hi guys almost DONE YAY !!!
just need the regulator and its all finished
added a tee feeder today for the ammo but I felt stupid having it in the way where I want my scope so I tried moving it to the side but feeding was still too manual so... I added a home made spring and tada* an automatic 10 ball feeding system :D
<a href="http://www.flickr.com/photos/24974530@N03/5206392027/" title="IMG_20101125_161533 by crks_wolf, on Flickr"><img src="http://farm5.static.flickr.com/4125/5206392027_4ccd485c24.jpg" width="376" height="500" alt="IMG_20101125_161533"></a>
slight tilt of about 80 degrees for the last ball to fall into place
<a href="http://www.flickr.com/photos/24974530@N03/5206393817/" title="IMG_20101125_163606 by crks_wolf, on Flickr"><img src="http://farm5.static.flickr.com/4152/5206393817_71b33b4063.jpg" width="500" height="376" alt="IMG_20101125_163606"></a>
Home-made with scooby-doo wire(craft wire) (not soldering but just as malleable)
<a href="http://www.flickr.com/photos/24974530@N03/5206393107/" title="IMG_20101125_161612 by crks_wolf, on Flickr"><img src="http://farm6.static.flickr.com/5250/5206393107_6378cd5027.jpg" width="376" height="500" alt="IMG_20101125_161612"></a>
just letting it dry in a decent potion so its currently upside down.
<a href="http://www.flickr.com/photos/24974530@N03/5206392513/" title="IMG_20101125_161544 by crks_wolf, on Flickr"><img src="http://farm6.static.flickr.com/5164/5206392513_91d64c5c05.jpg" width="376" height="500" alt="IMG_20101125_161544"></a>
This is where the leak was but its fixed no problem, but in a messy job ill build the 2nd one much neater I promise :wink:

Edit:

Ok today I researched and built a silencer with items around my house
Insulation or stuffing Foam
<a href="http://www.flickr.com/photos/24974530@N03/5209177669/" title="IMG_20101126_204855 by crks_wolf, on Flickr"><img src="http://farm5.static.flickr.com/4090/5209177669_8207cd1da0.jpg" width="376" height="500" alt="IMG_20101126_204855"></a>
Pop-up Sprinkler housing
<a href="http://www.flickr.com/photos/24974530@N03/5209175971/" title="IMG_20101126_204745 by crks_wolf, on Flickr"><img src="http://farm5.static.flickr.com/4103/5209175971_19337c4dd2.jpg" width="500" height="376" alt="IMG_20101126_204745"></a>
And Viola* !
<a href="http://www.flickr.com/photos/24974530@N03/5209176957/" title="IMG_20101126_204820 by crks_wolf, on Flickr"><img src="http://farm5.static.flickr.com/4154/5209176957_c56295a0f2.jpg" width="500" height="376" alt="IMG_20101126_204820"></a>
Reduced the sound by 20 decibels thats the difference between a park and a whisper OMF it was amazing so simple and fun ;D :shock: :P
Hope to hear fead back on anything you wish me to add thinking of adding the barrel grip next
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Unread postAuthor: sumisukyo » Fri Nov 26, 2010 2:32 pm

Sorry that this is a double post but....

IM FUCKEN FINISHED MATRIC NO MORE SCHOOL fork YA !!!!!!!!
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Unread postAuthor: jackssmirkingrevenge » Fri Nov 26, 2010 3:29 pm

Looking good, some videos of it in action would be nice :)
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OK a regulator is now a must have

Unread postAuthor: sumisukyo » Sat Nov 27, 2010 2:00 am

Found a Regulator :D
It's an oxygen but should work fine
had to make some major adjustments for it to fit though as the fittings are build to be used only for the blow torch,
<a href="http://www.flickr.com/photos/24974530@N03/5211426980/" title="IMG_20101127_125848 by crks_wolf, on Flickr"><img src="http://farm5.static.flickr.com/4126/5211426980_c7ffa16e13.jpg" width="376" height="500" alt="IMG_20101127_125848"></a>
<a href="http://www.flickr.com/photos/24974530@N03/5210826419/" title="IMG_20101127_125817 by crks_wolf, on Flickr"><img src="http://farm5.static.flickr.com/4107/5210826419_a537b00a1d.jpg" width="376" height="500" alt="IMG_20101127_125817"></a>
<a href="http://www.flickr.com/photos/24974530@N03/5211426290/" title="IMG_20101127_125801 by crks_wolf, on Flickr"><img src="http://farm5.static.flickr.com/4127/5211426290_dfbfbf4afa.jpg" width="376" height="500" alt="IMG_20101127_125801"></a>
<a href="http://www.flickr.com/photos/24974530@N03/5211425936/" title="IMG_20101127_125557 by crks_wolf, on Flickr"><img src="http://farm6.static.flickr.com/5209/5211425936_b23714a10d.jpg" width="376" height="500" alt="IMG_20101127_125557"></a>
<a href="http://www.flickr.com/photos/24974530@N03/5211440236/" title="epoxy by crks_wolf, on Flickr"><img src="http://farm5.static.flickr.com/4107/5211440236_7c3fc854b0.jpg" width="376" height="500" alt="epoxy"></a>
sooo thats that :D cant wait until tomorrow
I used Epoxy Putty to to this.
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