piston gun vented by a piston valve.

Show us your pneumatic spud gun! Discuss pneumatic (compressed gas) powered potato guns and related accessories. Valve types, actuation, pipe, materials, fittings, compressors, safety, gas choices, and more.
User avatar
th3p0p0
Specialist
Specialist
Posts: 194
Joined: Tue Oct 31, 2006 12:34 pm

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.



Image



Image



Image



Image



Image



Image



Image


Image


Image
User avatar
hi
Staff Sergeant 2
Staff Sergeant 2
Posts: 1619
Joined: Thu Feb 01, 2007 9:28 pm

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?
"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"
User avatar
th3p0p0
Specialist
Specialist
Posts: 194
Joined: Tue Oct 31, 2006 12:34 pm

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??
User avatar
hi
Staff Sergeant 2
Staff Sergeant 2
Posts: 1619
Joined: Thu Feb 01, 2007 9:28 pm

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.
"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"
User avatar
lukemc
Corporal
Corporal
Posts: 565
Joined: Sun Feb 25, 2007 8:48 am
Location: NY

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"
"Those who are different change the world. Those who are the same keep it that way"
User avatar
th3p0p0
Specialist
Specialist
Posts: 194
Joined: Tue Oct 31, 2006 12:34 pm

Sun Jun 03, 2007 7:24 pm

not the threaded part ware i glued at
User avatar
th3p0p0
Specialist
Specialist
Posts: 194
Joined: Tue Oct 31, 2006 12:34 pm

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.
User avatar
homedepotpro
Specialist 4
Specialist 4
Posts: 443
Joined: Sun Nov 26, 2006 1:00 am

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
User avatar
th3p0p0
Specialist
Specialist
Posts: 194
Joined: Tue Oct 31, 2006 12:34 pm

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?
SPUDMASTER91
Private
Private
Posts: 13
Joined: Sun Feb 04, 2007 3:22 pm

Mon Jun 04, 2007 9:37 pm

marbles or paintballs their pretty fun for a while :)
User avatar
Modderxtrordanare
Corporal 2
Corporal 2
Posts: 686
Joined: Mon Nov 20, 2006 1:22 pm
Location: Texas

Donating Members

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:
User avatar
spudthug
Corporal 5
Corporal 5
Posts: 936
Joined: Mon Feb 26, 2007 9:02 pm
Location: johnsonburg, Pa USA
Contact:

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:
4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
User avatar
th3p0p0
Specialist
Specialist
Posts: 194
Joined: Tue Oct 31, 2006 12:34 pm

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.
PVC Arsenal 17
Staff Sergeant 3
Staff Sergeant 3
Posts: 1762
Joined: Mon Mar 27, 2006 4:18 pm
Location: United States

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.
User avatar
lukemc
Corporal
Corporal
Posts: 565
Joined: Sun Feb 25, 2007 8:48 am
Location: NY

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...."
"Those who are different change the world. Those who are the same keep it that way"
Post Reply