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i need a little help

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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i need a little help

Unread postAuthor: cannon monkey » Wed Apr 29, 2009 9:20 pm

i going to try make a piston valve......

i thinking
2 inch tee
1/2 inch ball valve
chamber... i wanna use my old tank
i believe for the piston i going to use 1 and half inch endcap

wat i want to know... if the endcap for the piston is 1 and a half inch

can i use a 1 inch barrel??
or does it have to be smaller :?
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Unread postAuthor: Gaderelguitarist » Wed Apr 29, 2009 9:25 pm

Yes you can use a 1 1/2" end cap piston with a 1 inch barrel.

What matters is the sealing face, or the pipe that the piston seals against when pressure is held in the chamber and pilot area. As long as the outer diameter of the sealing face is smaller than the outer diameter of the piston, it will pilot and air will release out of the barrel.


FIRST POST :twisted:
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Unread postAuthor: cannon monkey » Wed Apr 29, 2009 9:28 pm

lol love the first post
thanks

i heard sometimes it wont work
i going for my very first piston :)

i have an old c02 tank i use to fill my first one.. could i use that for the chamber on this cannon.. the only way so far i can think of using this is hose clams to the side connecting it to the bottom of the tee with 1/4 inch hose

or should i spend the money and go all pvc
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Re: i need a little help

Unread postAuthor: Technician1002 » Wed Apr 29, 2009 9:32 pm

cannon monkey wrote:i going to try make a piston valve......

i thinking
2 inch tee
1/2 inch ball valve
chamber... i wanna use my old tank
i believe for the piston i going to use 1 and half inch endcap

wat i want to know... if the endcap for the piston is 1 and a half inch

can i use a 1 inch barrel??
or does it have to be smaller :?


A 1 inch barrel works well with a 1 inch pipe cap turned around and sanded to fit in a 1.5 inch pipe as the valve cylinder. My Mouse musket was built this way as a coaxial instead of in a T.
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Attachments
PICT227.JPG
Mouse Musket piston valve.
1 inch barrel
2 inch chamber
1 inch pipe cap for the piston.
1.5 inch pipe in a female adapter for the valve cylinder.
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Unread postAuthor: cannon monkey » Wed Apr 29, 2009 9:36 pm

idk i like the idea of a piston... i just alot of help i really tight on money and most people say try it if it dont work start again but i dont have the money for that........

can sombody name parts and sizes for me??
i am using a 2 inch tee
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Unread postAuthor: Gaderelguitarist » Wed Apr 29, 2009 9:41 pm

i heard sometimes it wont work
i going for my very first piston Smile

i have an old c02 tank i use to fill my first one.. could i use that for the chamber on this cannon.. the only way so far i can think of using this is hose clams to the side connecting it to the bottom of the tee with 1/4 inch hose

or should i spend the money and go all pvc


It'll work as long as you have a surface for the pressure in the chamber to act upon the piston to force it back when the pilot pressure is reduced.

I only just recently (about three months) became confident with piston valves and am absolutely hooked. Their power is ridiculous and, when built right, they open incredibly fast. :D

If you were to go with a CO2 tank as a chamber, you would need to make sure you connect it with a larger diameter hose than 1/4". The flow restriction that would give you on a 11/2" valve would almost be criminal.
It might just be easier to make a PVC chamber for now. Attach it with threaded fittings so you can change your mind later.
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Unread postAuthor: cannon monkey » Wed Apr 29, 2009 9:43 pm

ok can thank you so much at the bottome where u say it says aim.. can i message you on aim?
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Unread postAuthor: Gaderelguitarist » Wed Apr 29, 2009 9:49 pm

Sure you can.
:D
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Unread postAuthor: cannon monkey » Wed Apr 29, 2009 9:50 pm

it says ur offline
check ur mail on here i send u my screen name
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Unread postAuthor: Gaderelguitarist » Wed Apr 29, 2009 9:53 pm

I think the system is referring to my old screen name which i had at the time i created my account.

I'll have to find a way to switch it.
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Unread postAuthor: hi » Thu Apr 30, 2009 9:17 am

For a 2'' pipe you need to use a 1.25'' endcap wrapped in tape, 1.5'' will not fit unless you turn it down on a lathe.
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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: cannon monkey » Thu Apr 30, 2009 1:10 pm

it fits i was in the store the 1 1/2 inch end cap went in the tee and moved freely with a nice fit
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Unread postAuthor: dewey-1 » Thu Apr 30, 2009 1:27 pm

cannon monkey wrote:it fits i was in the store the 1 1/2 inch end cap went in the tee and moved freely with a nice fit


It may fit in the tee but are you not putting pipe in the tee?
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Unread postAuthor: cannon monkey » Thu Apr 30, 2009 1:29 pm

i am confused :(


i was going put the 1 inch pipe into the tee half way so the 1.5 inch end cap would seal upp aginst it


ok i looked around i cant remember who made this we talked once before but this is the kind of piston i wanna make

http://www.instructables.com/id/SV2JQNEF5Y3KXNE/
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Unread postAuthor: dewey-1 » Thu Apr 30, 2009 1:57 pm

The 1 inch pipe I assume is the barrel.
What is the 1.5 inch end cap going to be sliding on?

I guess without a sketch, I have no idea of your construction method.
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