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o ring piston :)

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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o ring piston :)

Unread postAuthor: cannon monkey » Wed Aug 26, 2009 7:54 pm

ok could sombody draw up a picture of a 2 inch tee 1.5 inch porting and a piston made of a 1 1/4 inch cupler

what im asking is where do u put the o ring(s) how many

is there any thing else i need to do to the piston orings make it air tight how does air get past it

what size o ring

and price for the o ring i should be expected to pay
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Unread postAuthor: geardog32 » Wed Aug 26, 2009 7:58 pm

this isn't mine but it is a very good illustration. the credit for this goes to Jor2daje. the o rings go around the coupling where it comes into contact with the 2inch piece. you can get away with one o ring but i think using two is a common practice. i don't know what size o ring is needed. as for the air getting around it it needs a equalization hole drilled in through the coupling

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Unread postAuthor: jor2daje » Wed Aug 26, 2009 8:02 pm

haha c'mon cannonmonkey I made you that diagram for a 1.5" porting piston in a 2" T just make the oring grooves before end of 2" pipe the piston sits in. And if you use a oring you will have to make an equalization hole.

edit: haha you beat me to it geardog
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Unread postAuthor: Hubb » Thu Aug 27, 2009 3:26 pm

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Here is a quick sketch of the piston I put in my last one. It worked great.

Note: This diagram was drawn up rather fast, but if you need a easier-to-read version just let me know.
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Unread postAuthor: cannon monkey » Thu Aug 27, 2009 4:08 pm

jor2daje wrote:haha c'mon cannonmonkey I made you that diagram for a 1.5" porting piston in a 2" T just make the oring grooves before end of 2" pipe the piston sits in. And if you use a oring you will have to make an equalization hole.

edit: haha you beat me to it geardog


i know u made it for me i still have it and the list and price of items on my desk top
i just wanted to know where the orings go and how to get air past them thanks i got everything
my birthday is this money hopefully i get some money :)

p.s thanks hub i understand where to put it now :D do u know the size bolt nuts and washer i need? and what store sells neoprene rubber i can say i never seen that the ace has a rubber sheet about think of 2 nickels stacked but it 5 dollars for the small 7 inch squre
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Unread postAuthor: Hubb » Thu Aug 27, 2009 4:18 pm

All of the parts I got came from Ace (except the felt). The neoprene washers were found in those little pullout drawers they have. I don't remember the sizes.

If you are interested in making this piston, I will write up a how to (with sizes).
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Unread postAuthor: cannon monkey » Thu Aug 27, 2009 4:19 pm

ok i look tuesday
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Unread postAuthor: Hubb » Thu Aug 27, 2009 6:03 pm

I put together a how-to on building one of these pistons. The link is in the sig.
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Unread postAuthor: cannon monkey » Fri Aug 28, 2009 12:30 pm

ok i went last night
the while piston going cast me around 22 dollars thats cause i have to buy another lenth of 2 inch and 1.5 inch pipe but thats ok

then the o rings

im going wait until after i pay my phone bill to start buying and what is the felt for
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Unread postAuthor: Willdebeers » Fri Aug 28, 2009 12:37 pm

For mega-uber-supah-amazingness...duh...


Nah i'm guessing its to help sealing. :D
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Unread postAuthor: cannon monkey » Fri Aug 28, 2009 12:38 pm

could i just use like tape or somthing or anything like that :D
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