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piston materials

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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piston materials

Unread postAuthor: ThatGuy » Sun Feb 05, 2012 1:19 am

Will these parts work for a 1" barrel?
Its a 3/4" PVC cap (a bit bigger than 1" pipe), a screw and nut, and a "rubber packing sheet" I got at Lowes.

Image

Anyone used this rubber before?

Thanks
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Unread postAuthor: Proxywars » Sun Feb 05, 2012 1:49 am

It depends what ur gun is. That rubber will work well. However, use silicone oil and not gun oils or WD40.
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Unread postAuthor: ThatGuy » Sun Feb 05, 2012 1:54 am

silicon oil where the rubber meets the barrel? won't that dry up?
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Unread postAuthor: Proxywars » Sun Feb 05, 2012 2:05 am

Yes. With my old fail pengun the leaked the silicon oil stopped the leaks and sped the piston up increasing velocity and it was consistent for 9 days. BTW my gun broke and leaked because I ran out of silicon oil and put wd40 which wrecked the rubber......
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Unread postAuthor: Packols » Sun Feb 05, 2012 2:56 am

it leaks throu the barrel
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Unread postAuthor: Proxywars » Sun Feb 05, 2012 3:11 am

Yesir. Just stick with silicone and high pressures and you will have no leaks my friend :D .
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Unread postAuthor: Crna Legija » Sun Feb 05, 2012 4:41 am

Proxywars wrote:Yesir. Just stick with silicone and high pressures and you will have no leaks my friend :D .


lol silicon wont seal crap make sure you get the barrel square in the barrel and put epoxy around the bolt to stop air going thought there.

Also when you sand the cap to fit in the pipe, do it slowly and keep testing to see as soon as it fit stop the tighter the better so long it slides nicely.
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Unread postAuthor: Gun Freak » Sun Feb 05, 2012 9:49 am

Proxywars... Shut up.

OP, you'll need a washer to hold down the rubber in the front, it will probably just slip off the nut. What chamber size is this for?
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Unread postAuthor: ThatGuy » Sun Feb 05, 2012 12:52 pm

2" chamber and 1" barrel

the piston will fit into a 1 1/4" pipe

Should I use this rubber or find something better? if so where would I find it?
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Unread postAuthor: Goats spudz » Sun Feb 05, 2012 12:55 pm

i would suggest using material off of a nitrile rubber glove glued onto that thick rubber. :D
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Unread postAuthor: Proxywars » Sun Feb 05, 2012 2:37 pm

Gun Freak wrote:Proxywars... Shut up.

OP, you'll need a washer to hold down the rubber in the front, it will probably just slip off the nut. What chamber size is this for?


Geese..... I got myself thinking on my gun how the piston was a tight fit. But with his it's not the same case so he doesn't need oils... My mistake...

Crna Legija wrote:lol silicon wont seal crap make sure you get the barrel square in the barrel and put epoxy around the bolt to stop air going thought there.

Also when you sand the cap to fit in the pipe, do it slowly and keep testing to see as soon as it fit stop the tighter the better so long it slides nicely.


Sorry thinking of my gun when I posted that.. Piston got caught on a dent and oil helped it...
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Unread postAuthor: ThatGuy » Sun Feb 05, 2012 2:46 pm

I'm not worried about the piston not moving- if It jams I'll use silicon oil or grease but I will try the hard rubber with nitrile rubber gloves
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Unread postAuthor: Proxywars » Sun Feb 05, 2012 2:48 pm

You wont need oils unless your piston is a little snug in the chamber. We all would like to see that puppy firing soon though :D .
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Unread postAuthor: Goats spudz » Sun Feb 05, 2012 5:51 pm

Proxywars wrote:You wont need oils unless your piston is a little snug in the chamber. We all would like to see that puppy firing soon though :D .
Oiling would improve performance as it would allow the piston to move with less friction.
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Unread postAuthor: Technician1002 » Sun Feb 05, 2012 7:04 pm

I used pipe caps as pistons in 2 of my cannons, The Dragon which used a 2.5 inch cap in a 3 inch pipe and the Mouse Musket which used a 1 inch pipe cap inside a 1.5 inch pipe. Both required sanding to fit. Take your time.

I used rubber o ring seals on the end of the barrel instead of bolting a seal onto the piston.

One thing in common is they eventually crack. Use a bumper to extend the life. Because of this, I no longer use pipe cap pistons except in my ABS test cannon which has an extended bumper.


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Showing the cracked pipe cap piston and open breech showing the 1.5 inch inner pipe and o ring seal on the barrel.
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