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New to pistons

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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Unread postAuthor: Gun Freak » Tue Aug 30, 2011 9:20 pm

I can upload it tomorrow; the plans are on my computer. I'm on my mobile.
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Unread postAuthor: Mooglebass » Tue Aug 30, 2011 9:24 pm

Its cool, When you get the chance. thanks
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Unread postAuthor: Gun Freak » Wed Aug 31, 2011 6:56 pm

Primitive piston plans :P
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Unread postAuthor: mattyzip77 » Wed Aug 31, 2011 7:02 pm

nice layout dude, a 3 year old could figure this out! :kermit:
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Unread postAuthor: Technician1002 » Wed Aug 31, 2011 7:03 pm

To get a good seal, get o rings that are just large enough to touch the inside of your pipe all the way around without stretching.
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Unread postAuthor: Gun Freak » Wed Aug 31, 2011 7:05 pm

Thanks for adding that Tech, I never go by actual size of the o-ring, I just try the different ones and try to find the best fit.
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Unread postAuthor: Mooglebass » Wed Aug 31, 2011 8:07 pm

Thanks a bunch, I will see what I come up with. I read in another thread that i think you posted about epoxying the nuts for no air leaks. would lock nuts stop the air flow or no?
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Unread postAuthor: Gun Freak » Wed Aug 31, 2011 8:16 pm

No, it can get around the threads. I would epoxy behind the metal washer behind the sealing face.
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Unread postAuthor: Mr.Tallahassee » Wed Aug 31, 2011 9:45 pm

Actually, I used teflon tape on the threads and it sealed perfectly. No need to make things permanent.
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Unread postAuthor: Gun Freak » Wed Aug 31, 2011 10:01 pm

Ehem, where the side of the nut touches the side of the washer, it's not air tight.
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Unread postAuthor: Mr.Tallahassee » Wed Aug 31, 2011 10:10 pm

But where the Front nut touches the sealing face, it actually is. Besides, A small circle of gasket rubber would fix that as well. I guess I got lucky because my bolt/washer piston doesn't leak at all anymore. I got a good seal and it fires consistently.
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Unread postAuthor: mattyzip77 » Thu Sep 01, 2011 2:54 am

Mr.Tallahassee wrote:Actually, I used teflon tape on the threads and it sealed perfectly. No need to make things permanent.

Epoxy would not make it permanent, a little elbow grease would get the nut off if needed, however it would be airtight.
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Unread postAuthor: Gun Freak » Thu Sep 01, 2011 5:33 am

Mr.Tallahassee wrote:But where the Front nut touches the sealing face, it actually is.

Wrong again, the front nut doesn't touch the sealing face.
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Unread postAuthor: dewey-1 » Thu Sep 01, 2011 8:58 am

Gun Freak wrote:Primitive piston plans :P


I can make a 2D/3D CAD drawing for you if you would like.

If you want it, we can discuss some dimensions on PM. Let me know.

It can also be posted in the Sketchup Model library.
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Unread postAuthor: dewey-1 » Sat Sep 03, 2011 8:38 am

Here are some "unprimitive" plans of Gun Freak's nut and washer piston.

Any problems let me know Gun Freak.
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gun-freak-piston=1.jpg
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gun-freak-piston=3.jpg
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