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carbon fibre pen gun

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carbon fibre pen gun

Unread postAuthor: jackssmirkingrevenge » 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:

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Last edited by jrrdw on Thu Oct 24, 2013 2:36 pm, edited 1 time in total.
Reason: Fixed video.
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Unread postAuthor: pneumaticcannons » Sun Oct 28, 2012 3:11 am

Thats looks so awesome :D
So is the body re-enforced or completely CF?
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Unread postAuthor: wyz2285 » Sun Oct 28, 2012 5:54 am

Beautiful.
A 4.5 mm at 200 bar wound make this thing a serious killer
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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: Labtecpower » 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
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Unread postAuthor: jackssmirkingrevenge » 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
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Unread postAuthor: pneumaticcannons » 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
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Unread postAuthor: Brian the brain » 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
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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: sagthegreat » 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
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Unread postAuthor: jackssmirkingrevenge » 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.
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Unread postAuthor: POLAND_SPUD » 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)
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Unread postAuthor: jackssmirkingrevenge » 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.
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Unread postAuthor: POLAND_SPUD » 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
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 28, 2012 3:23 pm

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

Remember this?



It definitely works for lower pressures...
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Last edited by jrrdw on Thu Oct 24, 2013 2:31 pm, edited 1 time in total.
Reason: Fixed video.
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Unread postAuthor: POLAND_SPUD » 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) ?
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Unread postAuthor: jackssmirkingrevenge » 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
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