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high pressure piston 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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high pressure piston help

Unread postAuthor: spudtyrrant » Wed May 27, 2009 11:52 am

i made a metal piston gun it worked great for about 3 shots :cry: and then the wood piston i had made broke so you guys have any ideas for a piston about an 1 1/2 long that will fit inside a 3/4 inch galvanized nipple ty

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Unread postAuthor: Carlman » Wed May 27, 2009 12:01 pm

Did you use a bumper?
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Unread postAuthor: spudtyrrant » Wed May 27, 2009 12:03 pm

i built a rubber bumper for it i also probably shouldn't use wood at 400psi :lol:
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Re: high pressure piston help

Unread postAuthor: Technician1002 » Wed May 27, 2009 12:07 pm

spudtyrrant wrote:i made a metal piston gun it worked great for about 3 shots :cry: and then the wood piston i had made broke so you guys have any ideas for a piston about an 1 1/2 long that will fit inside a 3/4 inch galvanized nipple ty

Image


HDPE works fine. Here is an inch and a half piston made for my Mouse Musket, a coax with a 2 inch chamber and 1 inch barrel. It wouldn't take much to adapt this to other sizes. My barrel has an o ring seat, so the piston does not need a rubber face. I made it that way to make the piston lighter.
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PICT246.JPG
Turning the piston with a drill press
PICT248.JPG
Cutting the piston face true and smooth.
PICT250.JPG
Breech parts with piston, bumper, and pipe plug.
PICT252.JPG
Close fit works well. Piston in the new home.
PICT229.JPG
Mouse musket breech with the o ring.
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Unread postAuthor: spudtyrrant » Wed May 27, 2009 12:11 pm

i would be cool but i don't have any readily available hdpe nor any ability to accurately machine it (at the moment) i was thinking a hot glue piston do you think that would hold up to 400 psi :?
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Unread postAuthor: Technician1002 » Wed May 27, 2009 12:13 pm

spudtyrrant wrote:i would be cool but i don't have any readily available hdpe nor any ability to accurately machine it (at the moment) i was thinking a hot glue piston do you think that would hold up to 400 psi :?


How did you make the wood one?
HDPE can most often use the same tools.

HDPE often comes disguised as a cutting board. :D
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PICT243.JPG
Sheet of HDPE 7/8ths inch thick. The old original PVC pipe cap piston is sitting on it.
Last edited by Technician1002 on Wed May 27, 2009 12:17 pm, edited 2 times in total.
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Unread postAuthor: spudtyrrant » Wed May 27, 2009 12:15 pm

i used a sweeper sick and some sand paper lol also i was trying to do it with things i had on hand i didn't want to have to order anything
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Unread postAuthor: spudtyrrant » Wed May 27, 2009 12:31 pm

i dont have cutting board either :cry: is their any other easy simple materials i can use for my piston
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Unread postAuthor: Carlman » Wed May 27, 2009 1:03 pm

Ive used hot glue at 350 in my brass HP gun over 50 times so far altough im swithcing out to epoxy for neatness and to handle the aussie heat
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Unread postAuthor: Gippeto » Wed May 27, 2009 1:35 pm

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Unread postAuthor: Moonbogg » Wed May 27, 2009 6:49 pm

http://www.mcmaster.com/#8701k43/=228crr

?? Just over $1.00 per foot.
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Unread postAuthor: jmccalip » Wed May 27, 2009 6:56 pm

Give me $2 for shipping and i'll mail you a small piece of either 1" or 2" HDPE. I bought the wrong size, so I'm not using them.
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