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First submission!

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 submission!

Unread postAuthor: Pookydarts » Mon Dec 29, 2008 5:36 am

Hi! I'm a newbie! Still checking out how this photo uploading system works... hopefully there is a picture attached around here somewhere...
This is my 5th pneumatic.
Built on a 25mm sprinkler valve,
25mm class 18 pressure rated pressure tank,
25mm barrel
20mm barrel (shown)
and 13mm (id) sleeve for 20mm barrel
How do I add a damage pic?
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Pneumatic!
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Unread postAuthor: jackssmirkingrevenge » Mon Dec 29, 2008 5:49 am

Simple and nicely done, kudos :)

To add more pics, upload the image before posting (using the "Add Attachment" option) and it will allow you to upload more.
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Unread postAuthor: Ragnarok » Mon Dec 29, 2008 7:07 am

I like it. Very neat work.

In fact, I'm being entirely serious when I say it looks professional in it's build quality - at least, what I can currently see of it at least.
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Unread postAuthor: jitup » Mon Dec 29, 2008 10:17 am

Good Job! I appreciate the clean lines
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Unread postAuthor: Mateo » Mon Dec 29, 2008 11:09 am

beautiful. but do you have any pics that arent just a side shot. i like how thin it is.
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Unread postAuthor: MrCrowley » Mon Dec 29, 2008 2:59 pm

This might help with posting the images:
http://www.spudfiles.com/forums/posting ... 13190.html

Nice cannon btw. :)
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With damage!

Unread postAuthor: Pookydarts » Mon Dec 29, 2008 6:47 pm

Cheers for the link! I'll try again!
Here is the latest creation...

For the small barrel,
The projectiles are 1.5" hex head bolts screwed and glued into the little plastic skirts that I found in a hardware store that apparently can also be used to bolt toilets down, go figure!

The holes were made in a 44gallon drum that had some water in it.
The left hand one was pumped by hand to an unknown pressure (maybe 50-70psi?) with one of those little hand held bike pumps that used to be stored in the frame, and shot downwards at 45degrees so any ricochet would go into the grass. It tore through but fell out.
The right hand hole was the same bolt, at 120psi shot straight on, and it went straight through (one side) but is now lost in the drum... :?

A quick question from a sprinkler newbie, does anyone else have trouble with their sprinkler valves not reseating correctly sometimes?
I had to remove the little alignment spike/post that kept the diaphagm/washer assembly centered to fit the exhaust port.
Is there a better way?

Cheers once again for your replies and encouragement!
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Attachments
compressed.JPG
compressed.JPG (20.07 KiB) Viewed 1080 times
Projectiles.JPG
Projectiles.JPG (25.37 KiB) Viewed 1080 times
Damage.JPG
Damage.JPG (33.4 KiB) Viewed 1080 times
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With damage!

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Unread postAuthor: jook13 » Mon Dec 29, 2008 8:30 pm

I love them projectiles!

Nicely made man.

As to the re-seating problem, I cant really help you much there, mine works fine. Have you checked for any debris or anything on the sealing face
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Unread postAuthor: Pookydarts » Mon Dec 29, 2008 8:39 pm

Hey Jook! Yep they fly straight as a die! And hit like the proverbial hammer of thor!
I disassembled it the first time but couldn't find anything in there, just heard a "schnook" as it clicked back into place b4 I got it apart, now I put my thumb over the barrel, pump it up a bit and let go my thumb and it reseats. But still annoying...
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