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My First Coaxial... Many Pics AND NEW VIDEO!!!

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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Is this good for a first coaxial barrel sealing piston cannon?

Hell yea!
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My First Coaxial... Many Pics AND NEW VIDEO!!!

Unread postAuthor: spudkpi » Wed Aug 09, 2006 9:01 pm

This is my first Barrel Sealing Coaxial Piston Cannon I have created and i think that I actually had more fun building it than I do firing it. It is very very powwerful for how small it is. The chamber is 2'' and the barrel is 3/4'' and the piston is made from a 1-1/4'' coupler. To relieve the pilot i have used a modded sprinkler valve. The pictures explain it all and any design suggestions or ideas would be greatly appreciated.

http://media.putfile.com/My-Spudgun -----> The Video!
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Attachments
New Piston Combined.JPG
My new piston with O-ring (Slot machined on lathe)...
Old Piston Combined.JPG
My old piston which sealed with electrical tape...
Top.JPG
Top of barrel and chamber...
Bottom.JPG
Bottom of barrel and chamber with valve...
Sectioned.JPG
Inside of gun sectioned out with old piston...
Down Chamber.JPG
A shot of the barrel and chamber alignment... I worked hard to get the barrel straight without alignment fins of any sort lol...
Down Chamber.JPG (19.61 KiB) Viewed 2045 times
Overall shot.JPG
Overall shot of gun...
Last edited by spudkpi on Thu Aug 10, 2006 3:53 pm, edited 4 times in total.
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Unread postAuthor: Velocity » Wed Aug 09, 2006 9:07 pm

nice, looks great! 8)
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Unread postAuthor: ProfessorAmadeus » Wed Aug 09, 2006 9:17 pm

very nice gun but how old is the pvc? any damage pics?
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Unread postAuthor: spudkpi » Wed Aug 09, 2006 9:25 pm

Haha the only older piece of PVC is the chamber only because I had it in my garage... no damage pics yet im gonna take some tomorrow... I can't find any good ammo for 3/4'' barrels? any ideas?
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Unread postAuthor: M3NT4L » Wed Aug 09, 2006 10:02 pm

I like it simple yet efficient. Does the piston seal up good, im thinking of making one like this one but are coaxial sprinkler actuated piston guns as good as the old fashioned sprinkler guns.
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Unread postAuthor: djt » Wed Aug 09, 2006 10:06 pm

as good? they are much better if you use a spinkler to actuate it. its kind of like a large homemade version of a sprinkler valve but instead of a diaphram its a piston. and instead of a blowgun actuating it, its a sprinkler valve.
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Unread postAuthor: Velocity » Wed Aug 09, 2006 10:07 pm

paintballs fit PERFECTLY in .75" SCH 120; they fit decent in 3/4" SCH 80 or SCH 80 CPVC; prolly would fit alright in SCH 40 PVC

also, co2 cartridges and C batteries
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Unread postAuthor: spudkpi » Wed Aug 09, 2006 10:31 pm

Yea paintballs fit quit loosely in this but ill find some ammo.. always open to suggestions. But M3NT4l you said...
Does the piston seal up good
it actually slowly leaks into the barrel but i will soon fix it...
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Unread postAuthor: MrCrowley » Wed Aug 09, 2006 11:43 pm

spudkpi wrote:Haha the only older piece of PVC is the chamber only because I had it in my garage... no damage pics yet im gonna take some tomorrow... I can't find any good ammo for 3/4'' barrels? any ideas?


i think the damage pics are gonna be of you :lol: that pipe looks really old its yellow :shock:
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Unread postAuthor: Benny » Thu Aug 10, 2006 2:44 am

Why did you put o rings on the piston? Its no a chamber sealing valve.
But that is a very cool piston cannon, post some damage pics :D
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Unread postAuthor: MrCrowley » Thu Aug 10, 2006 3:09 am

Yeah i thought i saw o-rings on there somewhere.How did you cut the groove for them?
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Unread postAuthor: Benny » Thu Aug 10, 2006 3:26 am

Put the endcap in the lathe and fire away.
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Unread postAuthor: killagorrila99 » Thu Aug 10, 2006 5:18 am

ho dam nice gun, im thinkin bout makin a nother coixil (coaxil???) cannon soon
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Unread postAuthor: mark.f » Thu Aug 10, 2006 6:39 am

killagorrila, don't call him a ho just because he's got a better cannon than you! ;-)

Nice cannon though. I like the fact that you used an O-ring on the piston. That gives it much more reliable equalization that you can control by choosing the size of the equalization port. Too bad I still haven't found anybody who can do O-ring grooves for me yet.
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Unread postAuthor: spudkpi » Thu Aug 10, 2006 10:28 am

Yea I own a Jet Mini Lathe and I use a chuck on it that tightens around the coupler used for the piston and cuts ideal o-ring grooves. As for the PVC being old it is only about 3 months old so i put my full trust into it. It somehow became discolored. I used an O-ring on it because it slides better and i just created an equalization hole for air to fill the chamber. I do however need help with the seal. I am using a neoprene washer and it slowly leaks into the barrel???
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