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mini pen gun

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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mini pen gun

Unread postAuthor: ilovefire » Thu Jan 06, 2011 8:47 pm

had a couple bits of small pipe and thought i would try make a mini pen gun
barrel=75mm x 2.5mm
camber=4.5mm x 70mm
full length=90mm
piston= solid rubber
valve=high flow schrader core
pressure=400psi
other=O-ring for sealing to the custom adapter to shock pump

[youtube]http://www.youtube.com/watch?v=QoPSwB86x-M[/youtube]
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Last edited by ilovefire on Fri Jan 07, 2011 1:02 am, edited 2 times in total.
why make it if it dosent shoot?
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Unread postAuthor: irisher » Thu Jan 06, 2011 8:53 pm

That's pretty impressive. Is the power any good when you get to 400 psi?
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Unread postAuthor: ilovefire » Thu Jan 06, 2011 9:03 pm

just shot a couple empty beer cans went through the first but only dented the other, so its not to bad for its size
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why make it if it dosent shoot?
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Unread postAuthor: linuxexorcist » Fri Jan 07, 2011 12:56 am

That is an excellent idea, using the schraeder core like that, the whole thing looks great, clean

What pressure have you gotten it up to?
How is it held together? I'd guess epoxy
Idea; It looks to be very well suited to a sharpie extra fine point pen:
Image
That's The one

Image
It's at least 6mm wide all the way to about 1cm from the end, the opening on the end is about 5mm wide.:
Image
It's even the right length!
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Unread postAuthor: ilovefire » Fri Jan 07, 2011 1:07 am

thank you, ok so iv taken it to 400psi and yes it just held together with epoxy, as for the putting it in a sharpie its a good idea im just not sure how i would do it and still be able to fire it and still fill it, but ill look into it a bit more and see what i can come up with
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why make it if it dosent shoot?
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Unread postAuthor: linuxexorcist » Fri Jan 07, 2011 1:38 am

You'd use it like this:
Image

You could fill it by just pushing the entire thing out with a stick, then filling normally
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Unread postAuthor: Mr. Potato Head » Fri Jan 07, 2011 1:46 am

It seems that the problem would be more of how to fill it rather than how to fire it. I would suggest flipping it around and drilling a hole through the back side. That way the projectile can shoot out and when you remove the lid of the sharpie you have direct access to the valve. Just my two cents.
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Unread postAuthor: Zeus » Fri Jan 07, 2011 2:21 am

I'd turn it around the other way, it would leave it unusable as a marker but the pen could be used as a supressor.

(w00t, I beat JSR to a silencer based comment)
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/sarcasm, /hyperbole
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Unread postAuthor: jackssmirkingrevenge » Fri Jan 07, 2011 2:39 am

Very nice! Reminds me of my half-arsed effort here but I hadn't thought to use the schrader core thread as a fill adapter, brilliant :) I might have to revisit this.

I also have to say you're really taken epoxy construction on board and are churning out some great projects, kudos :)

I beat JSR to a silencer based comment


I don't normally advocate suppressors for penguns ;)
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Unread postAuthor: linuxexorcist » Fri Jan 07, 2011 10:47 am

You could do it either way, really, although, you are right Mr Potato Head, it could be easier to fill that way. you might have to drill out the nib end of the pen a little though, in order to fit the core and O ring through it.
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