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My Pneumatic Pen Gun -- piston doesn't activate

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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Unread postAuthor: jackssmirkingrevenge » Mon Jun 13, 2011 11:42 pm

plinkin wrote:Oh my goodness waiting is the hardest part of ANY build


Welcome to the joys of adhesive based construction ;)
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Unread postAuthor: plinkin » Tue Jun 14, 2011 1:44 pm

YESZH! I HAZ PENGUN!!!!

it workz!!! :twisted:

It's shooting a wad of tissue paper right through a piece of paper @ 200 PSI!

I'm attaching pics of my piston... not original for spudguns but it's different from any other pen gun I've seen posted. Instead of solid rubber, it's rubber glued to a metal piston.

Yu wantz video?
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Attachments
Photo on 2011-06-13 at 17.29.jpg
Piston
Photo on 2011-06-13 at 17.30.jpg
Barrel -- nothing but metal, no seal for itself.

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Unread postAuthor: jackssmirkingrevenge » Tue Jun 14, 2011 2:13 pm

Good job, let's see it in action :)
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Unread postAuthor: Gun Freak » Tue Jun 14, 2011 2:29 pm

Gratz! Yeah let's see the video!
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Here's the Vid!!

Unread postAuthor: plinkin » Tue Jun 14, 2011 7:21 pm

Here is a small compilation of shots and details of the gun I put together. It's a google doc video, not youtube, sorry... parents won't let me. But it's very similar.
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Unread postAuthor: plinkin » Wed Jun 15, 2011 2:43 pm

Uh, hello guys? Was my video appalling? What happened to all the replies? hahaha :roll:
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Unread postAuthor: warhead052 » Wed Jun 15, 2011 2:44 pm

Its not bad. Its pretty good actually. I wish I had a pump like that now...
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Unread postAuthor: plinkin » Wed Jun 15, 2011 2:46 pm

Wow, haha. That was a quick reply. Thanks for the comment! :)

yeah the pump was only 25 bucks at Sports Chalet. It was an impulse buy, actually (I knew I would be using it for guns like this even though I hadn't made any yet).
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Unread postAuthor: jackssmirkingrevenge » Sat Jun 18, 2011 12:42 am

plinkin wrote:Uh, hello guys?


Not easily accesible. If your parents banned youtube, there are plenty of other video hosting sites, even photobucket can host videos.
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Unread postAuthor: plinkin » Sat Jun 18, 2011 1:06 am

Hold on, doesn't the link work? Just to verify... I'm almost positive it should...
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Unread postAuthor: jrrdw » Sat Jun 18, 2011 5:18 am

Nice pen gun and the video link works here in the USA. Other countries may not allow Google video. Youtube is the most universal but content from restricted countries cannot be viewed here in the USA.

Try www.Photobucket.com, it's free and will probably get to those countries Google wont. Put the video on both places.
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Unread postAuthor: plinkin » Sun Jun 19, 2011 2:25 am

OK, just did. Here's the video:
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Unread postAuthor: jackssmirkingrevenge » Sun Jun 19, 2011 3:33 am

Nice!

Some comments:

- nice shock pump :) but what's stopping you from going to 400 psi?

- try using one 6mm and one 4.5mm BB in the cap (4.5mm touching the schrader) it will give you better pilot flow and the valve will open quicker

- it's a good idea - as long as you're safety conscious - to pressurise your pen gun first, before loading the ammunition. If not, you can poke in something that will then get between the piston and the breech and not allow your piston to seal, meaning you have to take it apart again...
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Unread postAuthor: Gun Freak » Sun Jun 19, 2011 3:06 pm

Very nice pengun! Makes me want to finish mine! Glad you got it working, nice job. :D
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