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Soldered Pen Gun

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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Soldered Pen Gun

Unread postAuthor: jor2daje » Thu Jul 02, 2009 1:30 am

After my first successful copper gun, I decided I would give brass a try after I found a source of cheap brass tubing. This is yet another copy of JSR's pen gun with a couple differences; its soldered together, the piston is serviceable and I built a different way of actuating the schrader valve.

The gun is about a 1' 4" made from a 3mm tube and a larger tube I forgot the dimensions of, the piston is the back of a bic pen that I turned down to the right diameter on the drill press. I used a bushing soldered to the chamber to make to piston serviceable.

I decided because this gun holds pressure for a very long time, I wanted to have a trigger system that was attached to the schrader so I didnt have to find an airsoft bb or small rod every time I wanted to fire, so I built a little trigger mechanism that is friction fit onto the schrader and has a bicycle spoke that pushes in the schraders pin.

Only one damage pic for now, I should be getting a compressor that I can take this to over 300 psi with soon, but for now Im stuck at the one eighty my bike pump can do. I was test firing at some cans in my garage, missed and broke a glass sitting on my work bench. It also went through two full soda can lined up, hopefully tomorrow I'll have pics off this and a video. My ammo is small nails.
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Attachments
solder pen gun.jpg
the whole gun
disassembled666.jpg
how it fits together
trigger.jpg
push button trigger
trigger off.jpg
trigger removed for filling
nail in door.jpg
not very impressive just a small nail fired at my door
new bullet.jpg
My new favorite ammo is the end of ball point pens.
entry666.jpg
Test fire at a can with my new ammo.
exit666.jpg
the exit hole
Last edited by jor2daje on Thu Jul 02, 2009 4:27 pm, edited 1 time in total.
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Unread postAuthor: Mitchza89 » Thu Jul 02, 2009 2:59 am

Job well done on the pen gun mate, she looks fantastic! Always nice seeing penetration too :D
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Unread postAuthor: theBOOM » Thu Jul 02, 2009 3:22 am

Very nice I like it alot :P

Very clean build how much range can you get? 8)

Boom :twisted:
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Unread postAuthor: CpTn_lAw » Thu Jul 02, 2009 4:38 am

Supah nice! Gotta love the metal, huh? ;)
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"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
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Unread postAuthor: spudmanb3 » Thu Jul 02, 2009 10:12 am

Very nice! the schrader valve actuation is good.
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Unread postAuthor: jackssmirkingrevenge » Thu Jul 02, 2009 1:56 pm

You'll be glad with the performance once you take it to higher pressures ;)

The trigger mechanism reminds me of the one I eventially fitted to this project.

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Unread postAuthor: jor2daje » Thu Jul 02, 2009 4:29 pm

Just posted a damage pic with my new favorite ammo.

haha ya cptn law I think brass might be my new favorite material to use now.
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Unread postAuthor: frozebyte » Fri Jul 03, 2009 9:10 am

Very nice pen gun, small but powerful enough! What psi do you use and i heard you lose quite a bit of psi when actuating the shrader valve with the spring still inside.(unmodded)
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Unread postAuthor: mark.f » Fri Jul 03, 2009 10:22 am

Looks very good! While it doesn't look very much like a pen, it does shoot very well. :D
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Unread postAuthor: twizi » Fri Jul 03, 2009 11:26 am

very nice build we should take over norh korea with our pen gun lol
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dont play with airsofter with 1000$ gun and play with a 5 dollar pair of glasses
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Unread postAuthor: joepage2008x2 » Fri Jul 03, 2009 12:00 pm

Hi, my first comment. The pen gun is looking good all you now need to do is make it look like a pen, or put it into a pen. Mine is for a chav deterant. :D

Ive made a few spud launchers before and recently just made a bb gun that works on pressures at 300psi and over using a homemade solenoid valve. (just search airsoft homemade solenoid valve on youtube)

I have two gun projects on at the moment, a semi-automatic 500psi bb gun, and also a pen gun- only about 110mm long, will look like a pen and shoot 177cal bb`s
Got to get a pump first, the piston seal blew on my last one - was testng gun up to 400psi.
just got to finish making them
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Unread postAuthor: rcman50166 » Sat Jul 04, 2009 12:03 am

joepage2008x2 wrote:Hi, my first comment. The pen gun is looking good all you now need to do is make it look like a pen, or put it into a pen. Mine is for a chav deterant. :D

Ive made a few spud launchers before and recently just made a bb gun that works on pressures at 300psi and over using a homemade solenoid valve. (just search airsoft homemade solenoid valve on youtube)

I have two gun projects on at the moment, a semi-automatic 500psi bb gun, and also a pen gun- only about 110mm long, will look like a pen and shoot 177cal bb`s
Got to get a pump first, the piston seal blew on my last one - was testng gun up to 400psi.
just got to finish making them


Here, if you're going for looks. Here's my pen gun. I think it is the undisputed champion of look-alike-pen-guns on the site.
http://www.spudfiles.com/forums/the-improved-pen-gun-t14456.html
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Unread postAuthor: joepage2008x2 » Sat Jul 04, 2009 6:34 am

looks like i have some competition then, my design pumps up from the barrel because this makes construction easier and also the valve works like a check valve. It will fire anything that is 4.5mm (177cal) although i can make pens with thinner/thicker barrel diameters. It may have a safety so i dont always shoot it in my pocket, i will show how all this works when i post a topic.
Got all of the parts, just got to get an old fridge compressor or get someone to lend me their pump. I will try and set up a chronograph with my computor to measure its velocity with different projectiles including the pen nib.
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Unread postAuthor: jackssmirkingrevenge » Sun Jul 05, 2009 5:25 am

rcman50166 wrote:I think it is the undisputed champion of look-alike-pen-guns on the site.


...even if you say so yourself :roll: :D but seriously, I would tend to agree. I wonder if MI5 has any openings?
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