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3 inch piston valve cannon build.

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: clemsonguy1125 » Sun May 08, 2011 9:44 am

I like combinations of springs, foam, soft rubber, and tennis balls, you will need a large bumper on yours.
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Unread postAuthor: LovableAirGuns » Sun May 08, 2011 9:49 am

Ill proberly be using a spring since im filling it from the chamber but ill also use a tennis ball cut in half mayby.
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Unread postAuthor: Technician1002 » Sun May 08, 2011 9:55 am

For a large washer, you will need to make your own. Find hardware stores that carry sheet neoprene and cut one with a hole saw on a drill press. Avoid big box stores as they don't carry what you need. Find a farm supply store or local hardware store.
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Unread postAuthor: LovableAirGuns » Sun May 08, 2011 9:58 am

http://m.youtube.com/index?client=mv-go ... =4mhc09cf9
^
I was thinking about doing a piston like this |
Get rid of the m at the beginning if it dosent work the first time.
Edit: by the way im using my phone.
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Unread postAuthor: Crna Legija » Sun May 08, 2011 10:02 am

getting rid of the m didn't work
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Unread postAuthor: LovableAirGuns » Sun May 08, 2011 10:10 am

Look up on you tube: barrel sealing piston valve (part 1) : it should be some balled old guy, the first minute is shooting then he shows the internals and stuff.
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Unread postAuthor: clemsonguy1125 » Sun May 08, 2011 11:42 am

Yeah the one made of solid wood. The only thing with that is its extremly heavy.
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Unread postAuthor: Gaderelguitarist » Sun May 08, 2011 1:07 pm

It doesn't need to be solid wood. You could make washers out of wood and mount them on a bolt similar to how people make pistons with metal washers, nuts, and threaded rod.
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Unread postAuthor: LovableAirGuns » Mon May 09, 2011 2:44 am

It doesn't need to be solid wood. You could make washers out of wood and mount them on a bolt similar to how people make pistons with metal washers, nuts, and threaded rod.


which is what i was thinking and then put it on a all thread rod :)
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Unread postAuthor: mark.f » Mon May 09, 2011 10:25 am

Wood can be used, but make very certain to seal it with a lot of polyurethane or resin (thin the resin with acetone and apply in thin coats), so moisture doesn't change its dimensions and cause it to bind or come apart.

While you're at making wooden pistons, why not slap on a leather cup seal for one-way equalization. Should add a certain je ne sais quoi to your piston. :)
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Unread postAuthor: Gaderelguitarist » Mon May 09, 2011 12:42 pm

Mark makes a good point. It's also critical to factor in the thickness of the finish when you make the wooden piece as well. Another solution would be to saturate the piece with a water thin CA glue, then sand smooth. This will make it extremely hard as well as protect it from moisture without changing the dimensions of the piston.
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Unread postAuthor: LovableAirGuns » Tue May 10, 2011 12:21 am

While you're at making wooden pistons, why not slap on a leather cup seal for one-way equalization. Should add a certain je ne sais quoi to your piston.


I know this might be a pretty stupid question but would mount it at the front of the piston? or does it mount some where else on the piston?



Another solution would be to saturate the piece with a water thin CA glue, then sand smooth. This will make it extremely hard as well as protect it from moisture without changing the dimensions of the piston.


The CA glue idea is great witch is what ill use when i get around to making the piston :D

cheers everyone on the help and a ideas :D
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Unread postAuthor: Technician1002 » Tue May 10, 2011 12:30 am

One comment on the piston seal. At 400 PSI in that diameter there will be tremendous force on the valve seat. If the seat is a narrow pipe edge, it will cut a smaller washer out of the larger one. Give consideration to make a wide valve seat so the rubber does not get sliced.
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