Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 66 users online :: 4 registered, 0 hidden and 62 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

Registered users: Bing [Bot], Google [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

diaphragm coaxial sprinkler exhaust cannon

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
Sponsored 
  • Author
    Message

Unread postAuthor: hi » Mon Jul 02, 2007 5:15 pm

i did it because i couldnt find anything else.

thanks for all the good comments. and as for those of you who didnt say anything....... just kidding
  • 0

"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
hi
Major General
Major General
 
Posts: 1619
Joined: Thu Feb 01, 2007 9:28 pm
Reputation: 0

Unread postAuthor: e1337 » Wed Jul 04, 2007 3:58 pm

How does the valve work in the Union? Also The cannon looks great.
  • 0


e1337
Staff Sergeant
Staff Sergeant
 
Posts: 110
Joined: Mon May 28, 2007 8:00 pm
Location: Florida
Reputation: 0

Unread postAuthor: hi » Wed Jul 04, 2007 4:13 pm

e1337 wrote:How does the valve work in the Union? Also The cannon looks great.


did you just say it looks good so i would answer your question? just kidding.

it works ecactly like a sprinkler valve does. the diaphragm it self works like a piston. when it is filed the diaphragm mover foward and seals, when it moves back it opens.

there is about 1 cm between the barrel and daphragm when it is not pressureized, but when pressureized it seals the barrel.

edit- the union just has a peice of rubber in it and nothing else.
  • 0

"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
hi
Major General
Major General
 
Posts: 1619
Joined: Thu Feb 01, 2007 9:28 pm
Reputation: 0

Unread postAuthor: e1337 » Wed Jul 04, 2007 4:27 pm

Is there an equalization hole in the rubber or do you fill both sides with sir?

EDIT: Sorry read it over and understand now.
  • 0


e1337
Staff Sergeant
Staff Sergeant
 
Posts: 110
Joined: Mon May 28, 2007 8:00 pm
Location: Florida
Reputation: 0

Unread postAuthor: spud yeti » Thu Jul 05, 2007 11:06 am

there is an equalisation hole as far as I know
  • 0

really good quote/phrase here
User avatar
spud yeti
Brigadier General
Brigadier General
 
Posts: 1030
Joined: Tue May 08, 2007 1:41 pm
Location: Cape town south africa
Reputation: 0

Unread postAuthor: hi » Thu Jul 05, 2007 11:59 am

nope, that is yet to be added. i was thinking to poking a hole in it, but i thought it would rip, so im putting a small tubee that goes on the out side that will have a ball valve on it.
  • 0

"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
hi
Major General
Major General
 
Posts: 1619
Joined: Thu Feb 01, 2007 9:28 pm
Reputation: 0

Unread postAuthor: Panzerfaust » Thu Jul 05, 2007 1:20 pm

Nice gun! I am surprised that your rubber diapraghm can stretch far enough to reach the barrel, but if it works then i guess im wrong. Is that a sch. 80 union? i always wondered if unions where pressure rated... A couple people where asking for how you stabilized the barrel, i found a very good way to do it. Buy a reducing bushing that takes your barrel size to your chamber size. Look on the smaller pipe side of the reducer and you will see the hole that the smalle pipe goes into with several spokes (Sp? spokes like on bike wheels) radiating out from it. Remove this hole and the spokes connected to it, you will now have a piece that your barrel fits into (sand it out so it fits through) and the outside edges of those spokes will fit perfectly into the inside of your chamber.
  • 0

User avatar
Panzerfaust
Staff Sergeant
Staff Sergeant
 
Posts: 129
Joined: Tue Apr 17, 2007 4:37 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: hi » Thu Jul 05, 2007 1:47 pm

yes, it a sch80 unon, pressure rated to 150 psi.


i like the idea on centering the barrel, it would require a lathe, but would work..

i already centered it with an end cap, but i might do this if i build another coaxial.
  • 0

"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
hi
Major General
Major General
 
Posts: 1619
Joined: Thu Feb 01, 2007 9:28 pm
Reputation: 0

Unread postAuthor: Panzerfaust » Sat Jul 07, 2007 3:13 pm

Lathe? Ha! i hacked it in half with a hack-saw and then used the same hacksaw to cut out the internal section with the spokes. Easy as pie. I have essentially no power tools but have been amazed how many different tools some ghetto ingenuity can replace. It fits perfectly, too.
  • 0

User avatar
Panzerfaust
Staff Sergeant
Staff Sergeant
 
Posts: 129
Joined: Tue Apr 17, 2007 4:37 pm
Reputation: 0

Unread postAuthor: frankrede » Sat Jul 07, 2007 3:23 pm

Awesome, nice clean construction!
  • 0

Current project: Afghanistan deployment
User avatar
frankrede
Lieutenant General
Lieutenant General
 
Posts: 3220
Joined: Thu Jul 20, 2006 9:47 pm
Reputation: 0

Unread postAuthor: Panzerfaust » Mon Jul 09, 2007 1:08 pm

I am thinking of making a pistol or something out of this design. I dont have any rubber sheet though. Do you think the some neoprene (old mousepad) would work? i think it would be thick enough that an equilization hole wouldn't cause it to shread.
  • 0

User avatar
Panzerfaust
Staff Sergeant
Staff Sergeant
 
Posts: 129
Joined: Tue Apr 17, 2007 4:37 pm
Reputation: 0

Unread postAuthor: noname » Mon Jul 09, 2007 1:49 pm

I made a diaphragm pistol that I'll post sometime, and I just used 1/8" sheet rubber. It holds 120 psi, doesn't require an equilization hole, and is able to exhaust well through just a blowgun.
<a href="http://www.spudfiles.com/uploader/uploadFiles/pistol1.jpg">Here it is!</a>

I don't think a mousepad will work, but you can try it if you want.

Hi, how does it equalize without a hole? Did you take the O-ring out of the union?
  • 0

User avatar
noname
Lieutenant General
Lieutenant General
 
Posts: 2699
Joined: Mon Apr 10, 2006 9:19 pm
Location: Bay Area, CA
Country: United States (us)
Reputation: 9

Unread postAuthor: mopherman » Mon Jul 09, 2007 1:57 pm

nonam, what kind of plug is that? is it hollow or does it cut off at the bottom?
  • 0

User avatar
mopherman
Brigadier General
Brigadier General
 
Posts: 788
Joined: Sat Feb 03, 2007 8:20 pm
Reputation: 0

Unread postAuthor: noname » Mon Jul 09, 2007 5:30 pm

It's a 2" male threaded plug. It's basically a pressure rated cleanout cap. It's hollow; if it was solid it would cost a load.
  • 0

User avatar
noname
Lieutenant General
Lieutenant General
 
Posts: 2699
Joined: Mon Apr 10, 2006 9:19 pm
Location: Bay Area, CA
Country: United States (us)
Reputation: 9

Unread postAuthor: mopherman » Mon Jul 09, 2007 5:56 pm

noname wrote:It's a 2" male threaded plug. It's basically a pressure rated cleanout cap. It's hollow; if it was solid it would cost a load.

i know its hollow, but mine have deep valleys in them instead of a flat surface. sorry for the wierdly worded post.
  • 0

User avatar
mopherman
Brigadier General
Brigadier General
 
Posts: 788
Joined: Sat Feb 03, 2007 8:20 pm
Reputation: 0

PreviousNext

Return to Pneumatic Cannon Database

Who is online

Registered users: Bing [Bot], Google [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'