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My first 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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My first piston

Unread postAuthor: jsefcik » Sun Sep 04, 2011 12:24 am

I just made a piston, which i have never attempted before, have one but didnt build it myself, therefore i thought i would give it a go,

just basic washers rubber washers and floating o-rings, nuts and threaded rod

gunfreak built my first one, but i did mine by using different washers then what my first one has

gunfreak your a genious , thanks for my first piston dude!!!!!!

I love the way mine works!!!!


here it is
http://imageshack.us/photo/my-images/845/dscf8823.jpg/
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Unread postAuthor: MrCrowley » Sun Sep 04, 2011 12:33 am

Did you seal it all up with epoxy? If not, the groove cuts in the washers aren't really required and I'm not sure how your sealing face wouldn't leak. You say it works so I assume you epoxied it together.
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Unread postAuthor: jsefcik » Sun Sep 04, 2011 12:40 am

MrCrowley wrote:Did you seal it all up with epoxy? If not, the groove cuts in the washers aren't really required and I'm not sure how your sealing face wouldn't leak. You say it works so I assume you epoxied it together.


Nope no epoxy here, just used teflon tape on the threaded bolt, that is all
Im happy with it!!!
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Unread postAuthor: MrCrowley » Sun Sep 04, 2011 12:47 am

Ah ok, well it will still leak out the sealing face. In this instance, you're not going to get a metal-metal seal with the metal washer and metal nut. The washer doesn't have threads so it probably wont seal against the nut (or spring washer) unless somehow some teflon tape got pinched between the two and it may act as a rubber gasket and seal, unlikely though.

I imagine the leak through the two o-ring washer assemblies will be enough to not require the grooves cut in the washers, so you probably didn't have to do that but doesn't matter now.

I'm just saying what I know from experience and what you have told me in this topic, chances are air will leak out the bolt, washer, spring washer, nut assembly on the sealing face.
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Unread postAuthor: nathanhd123 » Sun Sep 04, 2011 2:25 am

Nice piston. What are you using as a bumper?
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Unread postAuthor: Gun Freak » Sun Sep 04, 2011 8:45 am

Looking good!
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Unread postAuthor: jsefcik » Sun Sep 04, 2011 9:30 am

MrCrowley wrote:Ah ok, well it will still leak out the sealing face. In this instance, you're not going to get a metal-metal seal with the metal washer and metal nut. The washer doesn't have threads so it probably wont seal against the nut (or spring washer) unless somehow some teflon tape got pinched between the two and it may act as a rubber gasket and seal, unlikely though.

I imagine the leak through the two o-ring washer assemblies will be enough to not require the grooves cut in the washers, so you probably didn't have to do that but doesn't matter now.

I'm just saying what I know from experience and what you have told me in this topic, chances are air will leak out the bolt, washer, spring washer, nut assembly on the sealing face.


I got the idea from gunfreak, his doesnt leak and it almost the same thing, mine doesnt leak either

Nice piston. What are you using as a bumper?

im using half of a tennis ball, just like my other piston


Mr crowley, i will be putting some epoxy on it though since you mentioned it
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Unread postAuthor: Gun Freak » Sun Sep 04, 2011 10:31 am

My piston does have epoxy on it, did you look at the front?
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Unread postAuthor: mattyzip77 » Sun Sep 04, 2011 11:19 am

Not bad, I think you are finally getting it. What are the smaller metal washers for?? Overkill in my opinion, but good job! :P
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Unread postAuthor: jsefcik » Mon Sep 05, 2011 7:41 am

Gun Freak wrote:My piston does have epoxy on it, did you look at the front?


did you use clear epoxy? if you did good job, cause i can barely see it,


ill have to put some on mine!!!, thanks though


mattyzip77 wrote:Not bad, I think you are finally getting it. What are the smaller metal washers for?? Overkill in my opinion, but good job! :P


it holds the 2 inch washer in place, the 2 inch ones, are a little big for the bolt
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Unread postAuthor: Gun Freak » Mon Sep 05, 2011 9:08 am

My 2" washers were 3/8" ID but I still got away with using them because I used the circular ring part on the nuts to center them.
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Unread postAuthor: mattyzip77 » Mon Sep 05, 2011 9:53 am

Gun Freak wrote:My 2" washers were 3/8" ID but I still got away with using them because I used the circular ring part on the nuts to center them.

Yes I figured that out, when I was making mine I needed to tighten them bolts like a mutha f*cka!!!!
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Unread postAuthor: jsefcik » Mon Sep 05, 2011 12:55 pm

im gonna use bigger washers for my front part of my piston
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Unread postAuthor: mattyzip77 » Mon Sep 05, 2011 2:10 pm

If anything, use nuts so they are the same size or a little bigger than the inner diameter of your 2 inch washers like gf said. you want to make the piston lighter, not heavier!!
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Unread postAuthor: jsefcik » Mon Sep 05, 2011 2:12 pm

mattyzip77 wrote:If anything, use nuts so they are the same size or a little bigger than the inner diameter of your 2 inch washers like gf said. you want to make the piston lighter, not heavier!!


ohhh, ok , i can get the nuts with washers on them
like this
http://www.google.com/imgres?q=nuts+wit ... 80&bih=625
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