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small pneu handgun, will it work?

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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small pneu handgun, will it work?

Unread postAuthor: pizlo » Tue Jan 02, 2007 6:37 pm

i had an idea to make a small copper pneumatic hand gun. here is my basic plan.
Image

Do you think this would work to shoot a small Nerf dart at least 50 ft, or a marble.
The barrel would be almost a foot with the valve.
sorry for bad pic i made it quik
Is there a certain size a have to make the tank for effectiveness?
and can i solder this all,(all of the joints that aren't threaded)?
thanks.
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Unread postAuthor: singularity » Tue Jan 02, 2007 7:16 pm

dude i guarantee someone is going to give you crap for that diagram

but anyway why copper why not pvc (its a lot cheaper) and about the valve ball valves open slowly, i would suggest you use a sprinkler valve (but if your anywhere near where i live there "out of season" and you cant buy them). i sprinkler valve would give you much better performance. the handle on my big gun is just a piece of wood taped on really tight but on all my smaller guns i modified a tee to slide over the pipe so i could have a handle. lastly for i high powered pneumatic you want a chamber to barrel ratio of 2:1 to 4:1 i believe.

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Unread postAuthor: PVC Arsenal 17 » Tue Jan 02, 2007 7:29 pm

Sure it will work. Just a suggestion- 1/2" PVC is a near perfect fit for micro nerf darts.
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Unread postAuthor: pizlo » Tue Jan 02, 2007 9:43 pm

thx for the input.
could i drill a hole for the schrader in the copper with a GOOD dewalt hammerdril,(set on spin not hammer.)

also solder right?

can i cut copper pipe with a fairly good jigsaw? if not i might just end up doing this with pvc.
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Unread postAuthor: pyrogeek » Tue Jan 02, 2007 9:54 pm

Don't drill into copper pipe, that's just not a good idea. Look and find a fitting to solder in that has pipe threads, and convert it to 1/8NPT from there.

I would imagine you could cut copper pipe that way, but the correct way is to use a pipe cutter. This is a special tool that you sping around the pipe while slowly tightening it, which cuts the pipe very cleanly. I bought one at Harbor Freight for like $2.

PVC would be great for this, except if you are using it in the cold.

And don't use a ball valve, either use a modded sprinkler valve, or a QEV.
For what you are doing, I'm sure a 1 inch sprinkler valve would work great.
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Unread postAuthor: killagorrila99 » Tue Jan 02, 2007 10:37 pm

Sprinkler valves are ok for small cannons. They just suck balls for large ones. Yea, go for a qev sprinkler or piston. (the piston valve is the fastest, most reliable valve.)
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Unread postAuthor: pizlo » Wed Jan 03, 2007 6:58 am

how do i make a piston?
and i totaly forgot about a pipe cutter ive seen those before.
i might make this out of pvc but i lov the look of copper
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Unread postAuthor: ProfessorAmadeus » Wed Jan 03, 2007 7:12 am

You make a piston out of anything that fits good in the chamber. try dowel rods or other wood. Also you can use a pvc end cap of a smaller diameter for the piston.
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Unread postAuthor: MisterSteve124 » Wed Jan 03, 2007 9:09 pm

To cut copper pipe just use a pipe cutter. You can get one at home depot.
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Unread postAuthor: pizlo » Wed Jan 03, 2007 10:15 pm

im goin to use pvc instead and im going to make a piston valve, thx for your imput.
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