SpudFiles

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!

nice, looks great! 8)

very nice gun but how old is the pvc? any damage pics?

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 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.

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.

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

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...

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 that pipe looks really old its yellow

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

Yeah i thought i saw o-rings on there somewhere.How did you cut the groove for them?

Put the endcap in the lathe and fire away.

ho dam nice gun, im thinkin bout makin a nother coixil (coaxil???) cannon soon

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.

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???