carbon fibre pen gun

Miniature guns are novelty custom, unique, and sometime downright crude! Common construction materials often include pill bottles or pens. Show us your work!
User avatar
jackssmirkingrevenge
Five Star General
Five Star General
Posts: 26179
Joined: Thu Mar 15, 2007 11:28 pm
Has thanked: 543 times
Been thanked: 319 times

Donating Members

Sun Oct 28, 2012 2:38 am

Just a little something I've been playing with, same old pengun design but using new materials.

I upped the calibre to 0.22", a bit overambitious and the 10mm internal diameter of the body tube does not allow for much air but still, it will happily push a 16 grain pellet through a beer can. Here it is in action at 300 psi:

[youtube][/youtube]
Attachments
cfpg03.jpg
cfpg02.jpg
cfpg01.jpg
Last edited by jrrdw on Thu Oct 24, 2013 2:36 pm, edited 1 time in total.
Reason: Fixed video.
hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
pneumaticcannons
Specialist 3
Specialist 3
Posts: 392
Joined: Sat Oct 30, 2010 9:45 am
Location: shite country in asia
Contact:

Sun Oct 28, 2012 3:11 am

Thats looks so awesome :D
So is the body re-enforced or completely CF?
ramicaza <- My Youtube Channel
User avatar
wyz2285
First Sergeant 2
First Sergeant 2
Austria
Posts: 2385
Joined: Sat Mar 06, 2010 7:50 am
Location: Porto, Portugal
Has thanked: 1 time
Been thanked: 3 times
Contact:

Sun Oct 28, 2012 5:54 am

Beautiful.
A 4.5 mm at 200 bar wound make this thing a serious killer
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
User avatar
Labtecpower
Sergeant 3
Sergeant 3
Eritrea
Posts: 1297
Joined: Sat Feb 20, 2010 6:38 am
Location: Pyongyang
Has thanked: 5 times
Been thanked: 13 times

Sun Oct 28, 2012 7:06 am

ohh fap

that looks damn sexy :D

If you send a vid and some pictures to the producers of the James Bond movies you might even get a serious response, this wouldn't look bad in an Aston Martin :P
User avatar
jackssmirkingrevenge
Five Star General
Five Star General
Posts: 26179
Joined: Thu Mar 15, 2007 11:28 pm
Has thanked: 543 times
Been thanked: 319 times

Donating Members

Sun Oct 28, 2012 7:24 am

Cheers guys :)
pneumaticcannons wrote:So is the body re-enforced or completely CF?
No, pure CF tube. This stuff.
A 4.5 mm at 200 bar would make this thing a serious killer
I don't know if I'd trust this one with that pressure, but there's definitely scope for a 200-300 bar pengun...
If you send a vid and some pictures to the producers of the James Bond movies you might even get a serious response, this wouldn't look bad in an Aston Martin
Why would I want that bender using my stuff :D :D :D
hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
pneumaticcannons
Specialist 3
Specialist 3
Posts: 392
Joined: Sat Oct 30, 2010 9:45 am
Location: shite country in asia
Contact:

Sun Oct 28, 2012 7:42 am

No, pure CF tube. This stuff.
Just had a "why didn't I think of that" moment. I mean, those arms are perfect; robust, sexy, and practically made of epoxy.
made of epoxy
made of epoxy
:D
ramicaza <- My Youtube Channel
User avatar
Brian the brain
Moderator
Moderator
Netherlands
Posts: 3496
Joined: Mon Dec 05, 2005 2:06 am
Location: Holland
Been thanked: 3 times

Sun Oct 28, 2012 8:18 am

Looks awsome!

I have owned commercial airguns ( pistol) with about the same performance...

:shock:


With your machining abilities ....couldn't you get the most out of the concept by using hydraulic tubing?

Perhaps use an O-ringed sliding barrel as your valve, sealing against a rubber backplate...that would make it balanced so you could easily trigger it at high pressure... :D
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!!
sagthegreat
Specialist 3
Specialist 3
Posts: 343
Joined: Thu Feb 16, 2012 5:23 pm
Location: Leesburg
Contact:

Sun Oct 28, 2012 10:57 am

holy crap, a legit pen, except machined out of high pressure steel, go up to 1000 psi, OMG this has soo much potential
User avatar
jackssmirkingrevenge
Five Star General
Five Star General
Posts: 26179
Joined: Thu Mar 15, 2007 11:28 pm
Has thanked: 543 times
Been thanked: 319 times

Donating Members

Sun Oct 28, 2012 12:37 pm

pneumaticcannons wrote:practically made of epoxy.
made of epoxy
made of epoxy
:D
... and loosely packed diamonds :shock: :D
I have owned commercial airguns ( pistol) with about the same performance...


... and this is at just 300 psi! Tried it at 400 and it leaked :-/
With your machining abilities ....couldn't you get the most out of the concept by using hydraulic tubing?


The little sherline doesn't really like steel, but there's no reason why a sufficiently thick walled brass or aluminium small bore tube couldn't safely take 300 bar.
Perhaps use an O-ringed sliding barrel as your valve, sealing against a rubber backplate...that would make it balanced so you could easily trigger it at high pressure...


I had some ideas for a "valveless" variation:

Image

Image

The problem is that at those pressures, it's going to be bloody hard to trigger. Past 300-400 psi the ballistic knife is almost impossible to operate. On the other hand, that's with a 13mm bore and 1.32 cm<sup>2</sup> surface area. With a 4.5mm projectile, the area drops to just 0.159 cm<sup>2</sup>... so extrapolating that, if 300 psi is fine for the knife, then a BB firing pengun is good for 2500 psi... the seal fitment is a bit tricky for a spherical projectile though.
hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
POLAND_SPUD
Captain
Captain
Posts: 5402
Joined: Sat Oct 13, 2007 4:43 pm
Been thanked: 1 time

Sun Oct 28, 2012 2:00 pm

now that you have a lathe you could experiment with metal on metal seals

while wouldn't be exactly very useful for pneumatics it has some potential for hybrids (especially for cartridge hybrids)
Children are the future

unless we stop them now
User avatar
jackssmirkingrevenge
Five Star General
Five Star General
Posts: 26179
Joined: Thu Mar 15, 2007 11:28 pm
Has thanked: 543 times
Been thanked: 319 times

Donating Members

Sun Oct 28, 2012 2:44 pm

Note that the first diagram in my previous post doesn't have a separate seal but uses a lead projectile, I think this could be made to work for HPA.
hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
POLAND_SPUD
Captain
Captain
Posts: 5402
Joined: Sat Oct 13, 2007 4:43 pm
Been thanked: 1 time

Sun Oct 28, 2012 2:56 pm

are you assuming that pellet skirts can expand on their own to form a seal ? I don't think that's really what you meant.

Probably one would have to use swaging to make sure the projectile is sealed tightly
Children are the future

unless we stop them now
User avatar
jackssmirkingrevenge
Five Star General
Five Star General
Posts: 26179
Joined: Thu Mar 15, 2007 11:28 pm
Has thanked: 543 times
Been thanked: 319 times

Donating Members

Sun Oct 28, 2012 3:23 pm

Some form of swaging is obviously needed, but the shape of the skirt should help.

Remember this?

[youtube][/youtube]

It definitely works for lower pressures...
Last edited by jrrdw on Thu Oct 24, 2013 2:31 pm, edited 1 time in total.
Reason: Fixed video.
hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
POLAND_SPUD
Captain
Captain
Posts: 5402
Joined: Sat Oct 13, 2007 4:43 pm
Been thanked: 1 time

Sun Oct 28, 2012 3:43 pm

actually I don't

not bad so there was some testing done

but if it works for lower pressures wouldn't it work for higher pressures if there was a funnel shapped port (ie basicly a constriction) ?
Children are the future

unless we stop them now
User avatar
jackssmirkingrevenge
Five Star General
Five Star General
Posts: 26179
Joined: Thu Mar 15, 2007 11:28 pm
Has thanked: 543 times
Been thanked: 319 times

Donating Members

Sun Oct 28, 2012 3:58 pm

POLAND_SPUD wrote:actually I don't
It was done on your suggestion!

http://www.spudfiles.com/forums/viewtop ... tml#309515

:D
hectmarr wrote:You have to make many weapons, because this field is long and short life
Post Reply