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Mini piston design

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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Mini piston design

Unread postAuthor: noname » Sat Sep 02, 2006 9:53 pm

This is what the basics of my next gun are going to be. A clean mini piston gun like Mr. Plow did, except less than 1.5 cubic inches of pilot volume, which means insanely fast opening time if I use a sprinkler, which I probably will use. It's also going to be 2" sch 80 to eliminate couplers, or 2" sch 40 with orings and screws. I'm not sure of the barrel size yet, but maybe 1/2" SDR 13.5 sleeved in 1" sch 80.
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Attachments
Mini Clean Piston Gun.JPG
There will be a long 3/4" nipple screwed in actually into the chamber with a tight fitting washer inside the nipple, with the spring around the nipple.
Mini Clean Piston Gun.JPG (7.74 KiB) Viewed 1284 times
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Unread postAuthor: ProfessorAmadeus » Sat Sep 02, 2006 10:17 pm

Thats going to be really powerful because of how fast your going to vent the air. Cant wait to see it.
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Unread postAuthor: noname » Sun Sep 03, 2006 12:06 pm

Can't wait to make it ( I still don't know where I'm going to get 2" sch 80). Should be pretty sweet. Then I can make whole T shaped barrel sealing piston valves using this design.
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Unread postAuthor: spudmonkey » Sun Sep 03, 2006 7:35 pm

uhh u can get it at home depot in the electrical dept.
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Unread postAuthor: ProfessorAmadeus » Sun Sep 03, 2006 9:07 pm

Really? i have only found 2.5 inch fittings there.
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Unread postAuthor: noname » Sun Sep 03, 2006 9:10 pm

That isn't usually sch 80, it's conduit pipe. I'll look next time for it though.
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Unread postAuthor: Velocity » Sun Sep 03, 2006 11:48 pm

Nice. I just built my third coaxial today, and its still drying. This is my first ever using a diaphragm (all others have pistons). I tried to make it small (like PVC Arsenal 17's mini m203, which inspired me to build it), but I had trouble finding NSF-pw fittings in that size (oddly enough, I easily found large NSF-pw fittings, but not small ones). Oh well w/e

Good luck on your build
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Unread postAuthor: noname » Mon Sep 04, 2006 11:04 am

Everyone's always surprised on how easy diaphragms are and a lot of people who've never made them think they're a lot harder than pistons. They're just a frickin circle of rubber! I've made a couple of diaphrams and 1 other piston coaxial but this will be the best out of all of them.
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