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carbon fibre pen gun build log

Discuss miniature cannons built from things such as pill bottles and pen caps.
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Unread postAuthor: mattyzip77 » Mon Feb 04, 2013 3:35 pm

Very impressive.....I want one!!! :o
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Go Bruins!!!!
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Unread postAuthor: jackssmirkingrevenge » Mon Feb 04, 2013 3:52 pm

Here's the loading and firing sequence for the benefit of the prospective owner:

[youtube]http://www.youtube.com/watch?v=EIZHCZkKFG4[/youtube]
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Unread postAuthor: Brian the brain » Mon Feb 04, 2013 4:14 pm

I'd advise against loading a pressurised launcher..
It would be better to reverse that bit.

Point in a safe direction during the charging process though...

It looks awesome!
I believe I had a smile from ear to ear when I saw you thread on the firing cap.. :D
Priceless!

You could do an extra endcap with the internals of a ballpointpen attached..that would fit the barrel..
You'll have a functional pen... :wink:
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: jackssmirkingrevenge » Mon Feb 04, 2013 5:04 pm

Brian the brain wrote:I'd advise against loading a pressurised launcher..
It would be better to reverse that bit.

Point in a safe direction during the charging process though...


The reason for that is that if the piston isn't closed, you risk pushing the pellet too far in and this might jam the piston, critical since it cannot be dismantled.

It looks awesome!
I believe I had a smile from ear to ear when I saw you thread on the firing cap.. :D
Priceless!


cheers :) machine tools FTW!

You could do an extra endcap with the internals of a ballpointpen attached..that would fit the barrel..
You'll have a functional pen... :wink:


That's actually a very good idea! Don't have time to do it before going abroad tomorrow though.
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Unread postAuthor: wyz2285 » Tue Feb 05, 2013 8:16 am

It's a tight fitt, the barrel is not rifled right?? Any chrono data?
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: jackssmirkingrevenge » Tue Feb 05, 2013 3:39 pm

Smooth bore, didn't have time to chrony it but it should be doing around 250 fps with a 16 grain pellet.
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Unread postAuthor: wyz2285 » Tue Feb 05, 2013 3:43 pm

Feel brave enough to use 200 bar? That should make this truly useful.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: jackssmirkingrevenge » Tue Feb 05, 2013 3:46 pm

This is already in the post, in any case that pressure will be impossible to pilot with a Schrader, so it would have to be a qdv of sorts. Or a hybrid, that ,s still in the works :wink:
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Unread postAuthor: wyz2285 » Tue Feb 05, 2013 3:50 pm

Why? It's too hard to open?
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: jackssmirkingrevenge » Tue Feb 05, 2013 4:44 pm

Around 6.5 kg of force... Bit of stretch for a thumb trigger
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Unread postAuthor: sagthegreat » Tue Feb 05, 2013 6:17 pm

what bout a spring loaded bolt, kind of like real pen guns with the notch to hold it back
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Unread postAuthor: jackssmirkingrevenge » Wed Feb 06, 2013 1:52 am

The Schrader valve stem would break quickly from the repeated strain, and besides a spring loaded mechanism would take up a lot of length which would limit your barrel length and chamber size even further.
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Unread postAuthor: sagthegreat » Wed Feb 06, 2013 4:53 pm

is there any way to make a 200 bar trigger, that is small?
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Unread postAuthor: jackssmirkingrevenge » Thu Feb 07, 2013 1:40 am

This is how I would make it:

Image

That should be easy to open at any pressure, and using the barrel as a pump tube offers the realistic prospect of taking it to 200 bar manually.
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Unread postAuthor: jakethebeast » Thu Feb 07, 2013 1:58 am

Thats pretty sweet JSR, why don't you make it? :wink:
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Est Sularus Oth Mithas
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