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Pneumatic Pen-gun Project

Built a miniature 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: keep_it_real » Sat Apr 28, 2007 6:59 pm

I was thinking about how to make an easy little pump for something like this and I figured out something cool. I'm not sure if this has been said yet though. A presta valve is basically a check valve. All you have to do is turn one inside out for the outlet and just attach another the regular way for an inlet.

Just get a presta valve and blow in and out of it and you'll get it.

This could also be used for a check valve inside a barrel sealing piston. They're really light.
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Unread postAuthor: jackssmirkingrevenge » Sun Apr 29, 2007 5:58 am

I did some testing with half inch sections of nails with a masking tape tail, looks like much more effective ammunition than the lead shot. Target is a section of pine board.

[youtube]http://www.youtube.com/watch?v=80GtrWXQmo0[/youtube]

[youtube]http://www.youtube.com/watch?v=VLaRTjhNXm4[/youtube]
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Unread postAuthor: Hotwired » Sun Apr 29, 2007 6:23 am

Good stuff :)

Pretty much like ball point cartridge darts but now they can actually fit. I don't think the lead pellets have enough mass to be really good projectiles.
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Unread postAuthor: thrasmussen » Mon Apr 30, 2007 5:16 pm

What's the size for the aluminum tubing?
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Unread postAuthor: jackssmirkingrevenge » Mon Apr 30, 2007 10:21 pm

the smaller one is 4mm i/d, 5mm o/d (the brass barrel is 3.5mm o/d so it needs some tape around it for the aluminium to fit snugly) and the larger one is 5mm i/d, 6mm o/d - your local model/hobby shop should stock these kind of sizes in 1 metre lengths.
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Unread postAuthor: thrasmussen » Tue May 01, 2007 8:14 am

Thanks! :D As you can probably guess I'm thinking of making one myself just for the fun of it.
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Unread postAuthor: A-98 » Tue May 01, 2007 9:45 pm

ok, i have to make this short.

first off: this is simply ingenious, ive already got a design layed out for mine, which is basically the same with some minor changes. i have also figured out a way to cram it inside a regular fine point sharpie. it will look basically the same. i was planning to build it last weekend, but i got my internet taken away from me for the rest of the year (i have a crazy dad, *sigh*) so i have to use school internet. ill see if i can upload from school laptops. i also got in trouble with school and blah blah long story short im not sure if i can build it for a bit. maybe this weekend.... i dunno.

i might be able to upload at friends house.

ive also figured out a firing mechanism, maybe, dunno yet.

i beleive my friend has a shock pump, so this is going to be a inexpensive project for me, good thing, cause im broke :D

ill be sure to PM you the pics first, cause after all, you are the inspiration for it! my friends are asking if i can make them for them. they have offered 40$$ :shock:

second thing: you are amazing, definitely one fo the best. maybe im going to make a shrine...no wait, that would make me look crazy.... :tard:
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Unread postAuthor: jackssmirkingrevenge » Tue May 01, 2007 9:58 pm

Thank you all for the feedback. Anyone wishing to replicate the design and needs any pointers, feel free to PM me or ask here. I really, really recommend a high pressure pump - there's no worries about failure because it's all metal after all and on a small scale - and it really makes a difference to performance.

Still, maybe this is a little too small - I was thinking of scaling the design up a little to 6mm calibre and making an air-powered replica of the bicycle-pump 0.22 gun used in the film Munich (see attachment) - it would basically be an extended version of my original mini-piston design with a pump handle for a trigger and maybe an integral suppressor.
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Attachments
munichpump.gif
bicycle-pump covert weapon from "Munich" complication
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Unread postAuthor: Insomniac » Wed May 02, 2007 5:11 am

Hehehe you should make another one of these and fill the barrel with ink, then put a tiny bit of alfoil over the end of the barrel. Pressurise it and bring it to school/work/cinema. Fire it at the back whoevers head is closest. :lol:
'WTF JUST HAPPENED!!!!!!!'
"Errrm, my pen leaked...' :lol:
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I wonder how much deeper the ocean would be without sponges.
Right now I'm having amnesia and deja vu at the same time. I think I've forgotten this before.

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Unread postAuthor: bboymatty » Wed May 02, 2007 10:25 am

thats sweet. Id love to see how long the pressure could be maintained in that thing. Never know, might just be the next spy gadget hahah
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Unread postAuthor: jackssmirkingrevenge » Wed May 02, 2007 11:19 am

I left it overnight at 300 psi, it was fine in the morning :)
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Unread postAuthor: super spuder » Wed May 02, 2007 3:24 pm

i told my friend at school about this thing, and now he wants me to make one for him so he can take it to school :lol: i need to figure out how to make one :roll:
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trying to decide on a new project, probably something small.
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Unread postAuthor: Hawkeye » Wed May 02, 2007 4:11 pm

That sounds like great idea. Hopefully you can't figure it out.
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Unread postAuthor: super spuder » Wed May 02, 2007 6:43 pm

I can't now. Ok this is a funny story. I start out spudding last summer, Mom can i make a mini combustion, mom says "ok". Little bit later on. Mom, can i build a big pneumatic cannon. Mom says "ok". In the winter time (3 months ago) Mom, can i build a cannon using propane and oxygen to fuel it?, Mom says "ok" just lately, mom, can i build a golf ball cannon capable of launching a golf ball over 600 yards. Mom says "ok ". just last weekend. Mom, can i build a marble cannon. Mom says "ok" earlier tonight. Mom can i build a itty bitty pen gun that can only shoot through a piece of paper, Mom says "NO". :lol: i am lucky my mom doesn't go out in my shop hehehe. It will be easy to hide luckily
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trying to decide on a new project, probably something small.
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Unread postAuthor: A-98 » Thu May 03, 2007 10:08 pm

ah, dreamweaver class, able to get on internet!

i too have been contemplating scaling it up, but first i think i will cram it inside a sharpie and shoot my english teacher *cackle*

as for the scaled version, at my hobby store they have some brass pipe that looks to be 3/4", but im scared of using your epoxy methods cause i know it'll die :? . and the problem with using the one-size-smaller-sleeved method that you used on this one it will get expensive fast.

maybe ill make one that can fit inside an umbrella or ..Ooo! a crutch.
"i may look crippled, but dont try to push me over!"
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