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4mm Marker Gun v2

Built a BB Machine Gun? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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4mm Marker Gun v2

Unread postAuthor: pneumaticcannons » Thu Sep 15, 2011 3:58 am

This deserved a new thread :)

So basically this one is similar to v1 except it uses a different type of piston and i made it with out that ugly outer barrel that i had on v1. its also a bit more powerful :twisted:

Specs:

Main valve: Hot glue piston with a Nerf dart tip as the sealing face (screwed it on)
pilot: schrader
barrel: 4mm (unfortunately plastic :? )
chamber: crayola marker
firing pressure: yes, again, 150 psi :twisted:

Here it is:
Image

without it's disguise:
Image

Image

the screw holding the nerf tip to the piston:
Image

It also serves as a tiny nerf gun :)
[youtube]http://www.youtube.com/watch?v=jy0c7iHtlWY[/youtube]

Shooting an iphone :lol:
[youtube]http://www.youtube.com/watch?v=OXa9HY3DvZg[/youtube]

That shot was made 5 mins after filling. As you can see it has NO leaks

It passed the idiot fooling test (i asked my friend if it looked like a marker) I was trying to make it look like one of those double sided markers (yes they do exist) and it turned out pretty good.

I was very surprised at the result of this test:
[youtube]http://www.youtube.com/watch?v=jgQRrfKtnUQ[/youtube]

Is this the smallest shotgun round ever???!!! :lol:
Image

proper fps testing to come... :
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Last edited by pneumaticcannons on Sat Sep 24, 2011 1:07 pm, edited 3 times in total.
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Unread postAuthor: daniel0663 » Thu Sep 15, 2011 4:52 am

firing pressure: yes, again, 150 psi

...... you must be kidding right? :lol:

besides from that, looks like a normal marker with a barrel sticking out..
makes me wanna finish off my coaxial, which was a failure.
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Unread postAuthor: pneumaticcannons » Thu Sep 15, 2011 7:00 am

hahahha ya thats what everyone says. dont get down if your co-ax doesn't work on your first try. This is actually a v3. the first was a total failure, the second worked fairly well and it wasn't until this one that i got it just right. good luck!
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Unread postAuthor: cammyd32 » Thu Sep 15, 2011 1:23 pm

That much power within a crayola marker case?! that's insane! I love concealed guns, especially penguns like this. great job, and love the ammo :D
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Unread postAuthor: pneumaticcannons » Thu Sep 15, 2011 2:26 pm

cammyd32- thanks, i was really surprised at the can full of water test also.
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Unread postAuthor: jackssmirkingrevenge » Thu Sep 15, 2011 11:28 pm

Good job, but you should really consider stronger construction and use of a shock pump, the difference in power will be a revelation.
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Unread postAuthor: pneumaticcannons » Sat Sep 17, 2011 1:24 am

jackssmirkingrevenge wrote:Good job, but you should really consider stronger construction and use of a shock pump, the difference in power will be a revelation.

remember, I live in thailand and it's extremely hard to find anything pvc, copper, or steel here. (actually i lied about the pvc but non of it is rated :( ) higher pressures would be great though. My wood shop teacher does have some small id copper which would be great for a hp pen gun...
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Unread postAuthor: jackssmirkingrevenge » Sat Sep 17, 2011 1:46 am

pneumaticcannons wrote:I live in thailand and it's extremely hard to find anything pvc, copper, or steel here.


You don't need any of those, all you need is brass and epoxy ;)
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Unread postAuthor: pneumaticcannons » Sat Sep 17, 2011 7:34 am

all you need is brass and epoxy


okay you've convinced me, i might as well give it a go (I got lots of free time :o )
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