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piston gun vented by a piston valve.

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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piston gun vented by a piston valve.

Unread postAuthor: th3p0p0 » Sun Jun 03, 2007 7:10 pm

well iv made 3 working piston guns and this is my latest. its a piston valve in a 2" T with a 3/4" barrel a 2" air chamber and the piston is made out of a 1-1/4" end cap with tape on it. and for the vent is a 1" piston in a 1" T with 1/2" porting wich is vented by a 1/4" ball valve. for lube (on the pistons) i use KY jelly. thats the specs now for the pics.



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Unread postAuthor: hi » Sun Jun 03, 2007 7:14 pm

nice. little messy, but still nice. is there any kind of delay between when you pull the ball valve open and when it fires?
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: th3p0p0 » Sun Jun 03, 2007 7:17 pm

no they both go at the same time and i have a leak ware the barrel screws in and cant get to stop any ideas??
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Unread postAuthor: hi » Sun Jun 03, 2007 7:23 pm

have you tried teftlon tape? if teftlon tape and a pipe wrench doesnt work then there is something wrong with the threads.

I you are 100% sure that everything is well built and will last a long time, then you can put epoxy on it.
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: lukemc » Sun Jun 03, 2007 7:23 pm

first off your avatar scares me. now that we got that out of the way i actualy thought about doing this and then thought you would have to be an idiot to try and make 2 pistons seal perfectly instead of one.(sorry) cool any ways but you should go exteme and make and uber mini piston to vent your second one like piston in 5/16 brakelile with a 1/4 brake line "barrel"
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Unread postAuthor: th3p0p0 » Sun Jun 03, 2007 7:24 pm

not the threaded part ware i glued at
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Unread postAuthor: th3p0p0 » Sun Jun 03, 2007 7:30 pm

if it scares you then im happy :lol: jk its the o rly owl with teeth. and i may be stupid im not dumb. and i think im just going to keep the 1/4" ball valve.
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Unread postAuthor: homedepotpro » Sun Jun 03, 2007 11:41 pm

i always though about something like that. im glad someone actually made one. seems a little overkill but hell its sweet
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Unread postAuthor: th3p0p0 » Mon Jun 04, 2007 10:00 am

over kill is good a thing hear :lol: this things a beast its very powerful but im getting tired of shooting 12g c02 thingys. is thir any other ammo for 3/4 that i don't know of?
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Unread postAuthor: SPUDMASTER91 » Mon Jun 04, 2007 9:37 pm

marbles or paintballs their pretty fun for a while :)
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Unread postAuthor: Modderxtrordanare » Tue Jun 05, 2007 2:19 am

A piston that actuates a piston that actuates a piston that actuates a piston that actuates a... Well you get the idea. :lol:
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Unread postAuthor: spudthug » Tue Jun 05, 2007 7:36 am

i would just use the ball valve to pilot it... ur probably not getting much more performance by pilotting it with a piston valve.... take the piston off and just use it for another gun.. u would already have the piuston and thats the hardest part of a gun...

design a rifle looking gun...rifles are always cool...


oh and while ur at it u might wanna slap a paint job on that because u didnt do a very good job with the primer :wink:
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: th3p0p0 » Tue Jun 05, 2007 10:55 am

why thank you spud thug it was a throw together gun so i didn't rely care
about primer stanes. im making a new gun today its a paint ball gun with a 3/4" sprinkler valve im going to use 45 and 90 degree elbows to make it look like a real gun and if its accurate ill put big ass scope on it.
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Re: piston gun vented by a piston valve.

Unread postAuthor: PVC Arsenal 17 » Wed Jun 06, 2007 6:27 pm

i use KY jelly.


For what? lol

The piston + piston is a little wierd, but it could actually be useful. Why not turn it around 180* and make another, smaller barrel that shoots marbles or something along with the main cannon. Traccers?

Or just buy a QEV and conserve space and use the small piston on an entirely new gun.
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Unread postAuthor: lukemc » Wed Jun 06, 2007 6:35 pm

for all you people *cough*spudthug*cough* that are saying why didnt you just use a ball valve. im pretty sure he wasnt going for increased performance as much as just being able to say "hey i made...."
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