Mini piston design

Show us your pneumatic spud gun! Discuss pneumatic (compressed gas) powered potato guns and related accessories. Valve types, actuation, pipe, materials, fittings, compressors, safety, gas choices, and more.
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noname
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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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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.
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 2797 times
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ProfessorAmadeus
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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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noname
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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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spudmonkey
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Sun Sep 03, 2006 7:35 pm

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

Really? i have only found 2.5 inch fittings there.
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noname
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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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Velocity
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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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noname
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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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