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any ideas for a 1 1/2 inch 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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any ideas for a 1 1/2 inch piston?

Unread postAuthor: djt » Mon Oct 16, 2006 4:44 pm

anyone have any ideas for a 1 1/2 piston? im looking to make a coaxil with a 1 1/2 inch chamber and a half inch barrell. just wondering if anyone had any quick piston ideas. i could also try a diaphram too but i dont know what i would use.
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Unread postAuthor: Atlantis » Mon Oct 16, 2006 4:55 pm

I made a piston for 1.5" Pipe out of a D or C cell battery wrapped in duct tape with a rubber ball glued on the end. Milk caps glued or screwed together will also work.
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Unread postAuthor: djt » Mon Oct 16, 2006 5:10 pm

actually i kind of changed my mind on this one. i think im going with a diaphragm. i have heard that the thin tupperware material works well. any ideas on a diaphragm?
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Unread postAuthor: Atlantis » Mon Oct 16, 2006 5:34 pm

That's the only thing I've heard of working besides neoprene washers. Some mousepad bases might work. I prefer pistons because you can always make them bigger, with diapraghms they only get cut smaller on accident.
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Unread postAuthor: djt » Mon Oct 16, 2006 6:27 pm

true true. im just trying to make this small gun as compact as possible and i believe diaphragms take up the least space. ill have to get the parts wednesday and start building.
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Unread postAuthor: Infernal2 » Tue Oct 17, 2006 7:29 pm

I've had a hell of alot of success with using PVC sheet shower and bath liners as diaphragms. I think it's $5.50US/ft at Home Depot. It's very thin, very flexible, and very slick.

I've also used it to wrap a piston to make it slide through my coaxial.
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