first coaxial plans

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.
Post Reply
Easterbunny
Private
Private
Posts: 19
Joined: Wed Jan 02, 2008 1:24 pm

Wed Jan 02, 2008 1:43 pm

well the pic is pretty self explanatory, but what my plan is to make an small air cannon with a 1.5in barrel and a 3in chamber in a coaxial setup. it will be diaphram valve piloted by a modded sprinkler.all of the internals will be hidden under a larger di tube. i've been showing this to my dad, he doesn't think it will work. i want to hear for you guys wether or not it will work so pls tell me what you think.
Attachments
pnumatic at4.JPG
Last edited by Easterbunny on Wed Jan 02, 2008 2:01 pm, edited 2 times in total.
Top
sandman
Corporal 2
Corporal 2
Posts: 672
Joined: Thu Mar 15, 2007 6:59 pm

Wed Jan 02, 2008 1:52 pm

looks fine in concept, but how are you going to hold the diaphragm in?
Top
Easterbunny
Private
Private
Posts: 19
Joined: Wed Jan 02, 2008 1:24 pm

Wed Jan 02, 2008 1:57 pm

the 3in endcap witch connects to the sprinkler valve right behind the diaphram.
Top
User avatar
jrrdw
Moderator
Moderator
United States of America
Posts: 6570
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Has thanked: 39 times
Been thanked: 22 times
Contact:
Contact jrrdw

Donating Members

Wed Jan 02, 2008 2:07 pm

Looks like it has potentual. When does the building begin? 8)
Top
sandman
Corporal 2
Corporal 2
Posts: 672
Joined: Thu Mar 15, 2007 6:59 pm

Wed Jan 02, 2008 2:09 pm

well i dont think that will work, because most people make their diaphragm so that it can be replaced but your design makes it permanent and that means that you have to get it right the first time.
Top
User avatar
Mr. Beaver
Private 4
Private 4
Posts: 66
Joined: Fri Nov 30, 2007 5:22 pm
Location: Israel

Wed Jan 02, 2008 3:41 pm

sandman wrote:well i dont think that will work, because most people make their diaphragm so that it can be replaced but your design makes it permanent and that means that you have to get it right the first time.


Anyway what you are saying is that it wil work the first couple of times until something will happen and he could not do a thing due to it being permanent.
Anyway good lob i think it will work
Top
sandman
Corporal 2
Corporal 2
Posts: 672
Joined: Thu Mar 15, 2007 6:59 pm

Wed Jan 02, 2008 3:43 pm

that is if he does it right :wink:
Top
Easterbunny
Private
Private
Posts: 19
Joined: Wed Jan 02, 2008 1:24 pm

Wed Jan 02, 2008 3:43 pm

im trying to think of a way to unscrew the back end entirely maby if i put a female connector on the front halve of the 25in mark and a male on the other.
Top
Easterbunny
Private
Private
Posts: 19
Joined: Wed Jan 02, 2008 1:24 pm

Wed Jan 02, 2008 3:44 pm

somthing like this
it could also be used for breach loading
Attachments
pnumatic at4.JPG
Last edited by Easterbunny on Wed Jan 02, 2008 3:46 pm, edited 1 time in total.
Top
sandman
Corporal 2
Corporal 2
Posts: 672
Joined: Thu Mar 15, 2007 6:59 pm

Wed Jan 02, 2008 3:45 pm

my suggestion is to use a union to hold the diaphragm in place, and this will also make it serviceable.
Top
Easterbunny
Private
Private
Posts: 19
Joined: Wed Jan 02, 2008 1:24 pm

Wed Jan 02, 2008 3:48 pm

im sorry this is very noobish, but what is a union?
nm just looked it up on the wiki. good idia
Top
sandman
Corporal 2
Corporal 2
Posts: 672
Joined: Thu Mar 15, 2007 6:59 pm

Wed Jan 02, 2008 3:51 pm

Image
that is a union, by unscrewing the middle both sides come off
Top
User avatar
BigJon
Specialist
Specialist
Posts: 120
Joined: Wed May 30, 2007 12:21 pm

Wed Jan 02, 2008 3:57 pm

A union would be a good option for servicability but a 3" one wouldn't exactly be cheap either.
Top
Easterbunny
Private
Private
Posts: 19
Joined: Wed Jan 02, 2008 1:24 pm

Wed Jan 02, 2008 4:00 pm

im attempting to find online sources for pvc pipes because my 3 local hardware stores dont have any 3in pipe that can take pressure. any suggestions?
Top
User avatar
BigJon
Specialist
Specialist
Posts: 120
Joined: Wed May 30, 2007 12:21 pm

Wed Jan 02, 2008 4:05 pm

Try http://www.mcmaster.com/
Top
Post Reply

Return to “Pneumatic Cannons”