Will this cannon design work?

jonnyboy · Mon May 26, 2008 7:56 pm

Will it work? Is their to much room between the barrel and pilot for the piston? I can't get it shorter without the serviceable piston. In real life it is about 1 foot.

SpudUke5 · Mon May 26, 2008 8:02 pm

Well now...........

1. Wye's are not pressure rated, do not use them.
2. since your drawing is crude, what do you need 4"-3" for and i dont know what you are talking about.
3. You dont need that extra space behind the pilot area (chamber), so use a elbow to make it a over-under.
4. Weight does matter, the lighter the piston the better.
5. Try to find a 3" tee, and a 3" fitting piston, it will be easier.
6. It shouldnt take more than 5psi to seal a good piston.
7. It it could work, disregarding the serious explosive hazards that can serverly hurt you.

Better, cleaner picture needed, and modified with what i have told you.

jr · Mon May 26, 2008 8:12 pm

The "Y" is concerning me as well

are you using pressure rated pipe? can you identify pressure rated pipe?

jonnyboy · Tue May 27, 2008 5:49 am

LikimysCrotchus5 wrote:Well now...........

1. Wye's are not pressure rated, do not use them.
2. since your drawing is crude, what do you need 4"-3" for and i dont know what you are talking about.
3. You dont need that extra space behind the pilot area (chamber), so use a elbow to make it a over-under.
4. Weight does matter, the lighter the piston the better.
5. Try to find a 3" tee, and a 3" fitting piston, it will be easier.
6. It shouldnt take more than 5psi to seal a good piston.
7. It it could work, disregarding the serious explosive hazards that can serverly hurt you.

Better, cleaner picture needed, and modified with what i have told you.

Alright I will. Since I want to get an aluminum piston I'm sure I can get it to fit.

XxtriviumxX · Tue May 27, 2008 6:06 am

What pilot valve are you using?

With a ballvalve and a quick connect you shouldnt need that "Y"

Edit: Oh, and may I suggest using PVC rather than Wye...

Check out my YouTube SpudGun Channel! · Tue May 27, 2008 6:15 am

XxtriviumxX wrote:Edit: Oh, and may I suggest using PVC rather than Wye...

A wye is PVC.

Please make sure you know what you are talking about before passing information along, it's dangerous.

@The OP,

Read this so you know how to indetify the correct type of PVC to use (pressure rated):
http://www.spudfiles.com/spud_wiki/inde ... _Rated_PVC

XxtriviumxX · Tue May 27, 2008 6:27 am

My mistake...

jonnyboy · Tue May 27, 2008 2:45 pm

XxtriviumxX wrote:What pilot valve are you using?

With a ballvalve and a quick disconect you shouldnt need that "Y"

Edit: Oh, and may I suggest using PVC rather than Wye...

How do I fit a ballvalve on an endcap? Is a quick disconnect a tire stem?

SpudUke5 · Tue May 27, 2008 2:49 pm

jonnyboy wrote:
XxtriviumxX wrote:What pilot valve are you using?

With a ballvalve and a quick disconect you shouldnt need that "Y"

Edit: Oh, and may I suggest using PVC rather than Wye...
How do I fit a ballvalve on an endcap? Is a quick disconnect a tire stem?

Well you can use a 1/4 inch metal ball valve if you make a hole in the cap and tap it.

Quick connect

Tire stem valve

jonnyboy · Tue May 27, 2008 3:52 pm

LikimysCrotchus5 wrote:
jonnyboy wrote:
XxtriviumxX wrote:What pilot valve are you using?

With a ballvalve and a quick disconect you shouldnt need that "Y"

Edit: Oh, and may I suggest using PVC rather than Wye...
How do I fit a ballvalve on an endcap? Is a quick disconnect a tire stem?
Well you can use a 1/4 inch metal ball valve if you make a hole in the cap and tap it.

How and what is a "tap". So you would get the quick connect in the endcap then hook up the hose from the compressor. Then what would the ball valve hook up to?

jonnyboy · Tue May 27, 2008 4:14 pm

If I use a 2'' tee with a 2'' piston and a 2'' barrel how do I get the piston to stop. Or do I have to go to a 3'' tee?

SpudUke5 · Tue May 27, 2008 4:25 pm

I think its about time you do some more searching.

Check out my YouTube SpudGun Channel! · Tue May 27, 2008 11:11 pm

Agreed. You lack some basic but compulsory knowledge to build a piston.

jonnyboy · Wed May 28, 2008 2:48 pm

MrCrowley wrote:Agreed. You lack some basic but compulsory knowledge to build a piston.

Hey I'm here to learn. Can you point me toward some helpful links that will help me.

Check out my YouTube SpudGun Channel! · Wed May 28, 2008 3:06 pm

The search function, the Spud Wiki and the Pneumatic Cannon Showcase section.
http://www.spudfiles.com/forums/search. ... 557feef1bb
http://www.spudfiles.com/spud_wiki/inde ... =Main_Page

And these may help:
http://www.spudfiles.com/forums/how-to- ... 10381.html
http://www.spudfiles.com/forums/piston- ... t8157.html

But of course you searched before posting this topic and found those before didn't you

And don't give me any crap about the search function, it works perfectly fine as long has you have half a brain and know how to use common sense to filter 800 results down to 50.