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Piston Material

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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Piston Material

Unread postAuthor: daniel323 » Fri Nov 27, 2009 3:53 pm

I know this is a frequently asked question, but i cant find a good piston for my gun. I am making a copper piston gun and the Chamber is (1" )copper.
In my town i have a Lowes hardware store. If there are any materials there please tell me.

Thanks
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Unread postAuthor: jackssmirkingrevenge » Fri Nov 27, 2009 4:10 pm

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Unread postAuthor: sgort87 » Fri Nov 27, 2009 5:24 pm

If you can find a solid rubber cylinder close to the ID of the piston track, that's the only thing you will need for your entire piston.
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1" Piston

Unread postAuthor: Procyon » Sun Nov 29, 2009 10:49 am

The one shown below is made from a piece of scrap plastic deck lumber made with the plug from an 1 3/8" hole saw then sanded to fit with a sander placed upside down in a vise. I put the dowel through the plug and sander spun the plug giving a smooth round shape. Total cost including the hardware was around $3.50 It's fully adjustable.
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Piston and wear plate.

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Unread postAuthor: spudtyrrant » Sun Nov 29, 2009 12:21 pm

If you have a torch you can make an HDPE piston.
but it must be done outside on account of the fumes produced

1) take a milk jug and cut it into small peices(about dime sized).
2) get a piece of copper the same diameter and length you want your piston, put an end cap on it.
3) put the "mold" assembly in a vice, or anything else to keep it still.
4)fill the copper mold with your milk jug pieces and pack tightly
5)turn on you torch and heat up the outside of the copper until the pieces look like hot glue inside the mold, then take a wooden dowel or anything else the same size(or close) as the the inside diameter of your pipe.
6) repeat steps 4-5 until your mold is filled to the top
7) wait about 20-30 minute for the HDPE to cool and tap it out with the dowel(its actually quite easy to get out)
add yourself a sealing face, and there you go, super light weight super strong piston

BTW, GO KU!!!!! :D
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Unread postAuthor: CasinoVanart » Mon Nov 30, 2009 5:33 am

Via pm send me the I.D. of your piston chamber and i will personally make you akick ass piston and send it to you for no cost.


Think i am joking? Thinky not.
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 30, 2009 5:40 am

Take advantage of this offer before he sobers up :D
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Unread postAuthor: CasinoVanart » Mon Nov 30, 2009 7:26 am

No crap this is a bone hard prozzy leveled offer!

Edit: Damned pussies think i am joking.
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Unread postAuthor: Major Collins » Mon Nov 30, 2009 11:01 am

omg want to make me a piston :D lol i hate my setup doesnt work ...
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Unread postAuthor: CasinoVanart » Mon Nov 30, 2009 6:15 pm

Send me the i.d. of your chamber and the length you would like your piston dude, it shall be done!
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Unread postAuthor: Major Collins » Mon Nov 30, 2009 9:26 pm

http://www.spudfiles.com/forums/viewtop ... 085#268085 okay in this look for my post and ther will be pic of my setup .. umm if you do send me the piston you should make it bigger so it wont fit loosely and also i can sand it down to make it fit :) (only needs to be about a inch and a half)
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Last edited by Major Collins on Tue Dec 01, 2009 12:35 am, edited 1 time in total.
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Unread postAuthor: daniel323 » Mon Nov 30, 2009 9:40 pm

Is just the size of the chamber not enough to base the size of the piston off of?

The chamber is 2 Feet of 1" copper pipe
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Unread postAuthor: spudtyrrant » Mon Nov 30, 2009 11:35 pm

daniel323 wrote:Is just the size of the chamber not enough to base the size of the piston off of?

The chamber is 2 Feet of 1" copper pipe
well if you have a co-axial piston yes, but he still needs to know the length you need it.
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Unread postAuthor: daniel323 » Tue Dec 01, 2009 10:46 pm

Do you think a 2" long piston would be good?

And yes the gun is a coaxial
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Unread postAuthor: spudtyrrant » Tue Dec 01, 2009 11:06 pm

daniel323 wrote:Do you think a 2" long piston would be good?

And yes the gun is a coaxial
you want to keep your piston as light as possible, thus as short as possible, i would go with a piston 1" or shorter
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