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Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: uruk-hai » Wed May 10, 2006 12:00 am

Really goes through batteries, er... I mean batteries really go through things.

    1/2" Cu coupler
    1/2" Cu pipe
    1/2" brass sweat to npt
    1/2" to 1" Fe reducer
    1" Solenoid valve
    1" Fe close nipple
    1" PVC Female npt to glue elbow
    1" PVC thick wall pipe, rated 480 psi
    (2) 1" PVC 45 degree couplers
    1" PVC Tee to 3/4" female ntp
    3/4" to 1/2" Fe reducer
    100 psi guage
    1" PVC cap
    Shrader valve
    Zip ties, large and small
    (2) Plastic Clothes pins
    (2) micro switches cut from old computer mice
    (3) 9v clips and batteries
    1/8" plywood, cut with a utility knife
    wood block to separate barrel and tank
    pvc solvent, pvc cement, pipe dope, teflon tape, wood glue, plumbing
    flux and solder, and hot melt glue,
    wire from a cat5 network cable
    heat shrink tubing
    1500 ohm resistor
    led assembly from old computer case
    hard drive magnet, 1" Fe washer to hold batteries

LED lights when safety depressed, enables trigger.
Driving forces were ergonomics, simplicity, and safety.
Thanks for looking. :D
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Attachments
sisters.jpg
Nearly identical twins
parts.jpg
zip tied wood block spacer, front safety switch,
trigger switch, and battery box.

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Unread postAuthor: Rambo » Wed May 10, 2006 12:04 am

I think that's a realy good one.The chamber could be smaler so you will be able to recharge with a hend held tank.
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Unread postAuthor: rna_duelers » Wed May 10, 2006 6:03 am

MAybe mod the sprinkler valve to pneumatic they work alot better and it doesnt require any battaries,and furthest shot lenght is?
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Unread postAuthor: Jakal444 » Wed May 10, 2006 9:02 am

Nice, Dual cannons, maybe it will be the new trend.
Now all that is needed is a way to fill both cannons at the same time with the same source.
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Unread postAuthor: uruk-hai » Wed May 10, 2006 12:41 pm

Hi, I gave one to a friend for his 40th bday. A modded valve would
probably help, as the solenoid approach seems to require a sizeable
volume between the exit port of the valve and the ammo.
Using Alpha-Alpha depleted alkaline mutions leaves little room to
vent the valve.

The valve flutters. :x

Using a blowgun mod would allow the vent to open w/o any need to
vent the top of the valve into the barrel.

Any idea how a 1/4" or 1/2" QEV compares to a 1" sprinkler, both using
blowgun triggers?

Thanks for the compliments, this is a really nice site! :lol:
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Unread postAuthor: Benny » Thu May 11, 2006 3:50 am

i think a 1/2 qev will compare to a 1 inch modded valve, anyway nice trigger.
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Unread postAuthor: rna_duelers » Thu May 11, 2006 5:28 am

QEV are leaps and bounds ahead in performance compared to a modded sprinkler valve,i remember in a post i think BLB said that a 1"spinkler only vents to a proportion of 4/16of an inch barrel properly which is kinda lame...Go for the QEV and it will own!
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Unread postAuthor: jrrdw » Thu May 11, 2006 5:52 am

I looked at this post a few times and just now noticed the cloths pin trigger set up. Good thinking! Very clever, i like it. The entire cannon is nicely done, good job.

Question-Is QEV a brand or style of sprinkler valve?
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Unread postAuthor: Rambo » Thu May 11, 2006 10:24 am

I don't think there is any problem with the flow.They launch tannis balls with these valves.
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Unread postAuthor: spudshot » Thu May 11, 2006 11:50 am

jrrdw, no QEVs are an entirely different valve, Quick Exhuast Valves, they far out perform spinkler valves, but they still dont compare to homemade valves
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