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Machined pengun - Dimply

Discuss miniature cannons built from things such as pill bottles and pen caps.
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Unread postAuthor: Lockednloaded » Wed Aug 03, 2011 6:51 pm

warhead052 wrote:There's only one thing left to do with the pen guns at this point, make em better.


Really? I'll bet he was hoping to make them worse :lol:
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Unread postAuthor: jackssmirkingrevenge » Wed Aug 03, 2011 11:56 pm

warhead052 wrote:You're right. How many hours do you get on your workbench a week?


Depends on work, errands... I could manage a couple of hours a day, the issue is getting started - once you do it's very easy to lose yourself in the machining, but again, it's all in the planning.

There's only one thing left to do with the pen guns at this point, make em better.


I don't think this coaxial type of pengun is going to get any better - you're limited to a small calibre, even if you up the pressure it will still be a "pea shooter".

A major improvement would be going "valveless" - bigger bore, zero "opening time", full flow.

edit: even better, imagine a "valveless" full auto integrally suppressed pengun :D
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Unread postAuthor: LeMaudit » Thu Aug 04, 2011 10:22 am

hahaha... I love the full auto one... :D
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Unread postAuthor: jackssmirkingrevenge » Thu Aug 04, 2011 11:24 am

Up the calibre to 3/8" and you get some serious muzzle energy for a pen sized package at 850 psi, legally a firearm in the UK :D

The difficulty is getting that seal in place...
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Unread postAuthor: Lockednloaded » Thu Aug 04, 2011 11:30 am

And how would you charge it if you have to have that cap on to hold the ball in place?
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Unread postAuthor: FighterAce » Thu Aug 04, 2011 12:25 pm

The cap seems to be in two parts... the brass one holds the ball while the aluminum one is just an extension.

Nice designs :wink:
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Unread postAuthor: LeMaudit » Thu Aug 04, 2011 1:31 pm

Up the calibre to 3/8" and you get some serious muzzle energy


:shock: :idea: :?

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Unread postAuthor: jackssmirkingrevenge » Thu Aug 04, 2011 10:31 pm

LeMaudit wrote:Image


Yes you can :D

Of course this would be best a simple single shot launcher for a cartridge...
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Unread postAuthor: Gun Freak » Thu Aug 04, 2011 10:35 pm

Cartridge pengun :D
I love the full auto one but I doubt you'd get more than 3 shots off. Still... Full auto pengun, cartridge pengun, valveless pengun, oh the things JSR can build with Sherline :)
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Unread postAuthor: jackssmirkingrevenge » Fri Aug 05, 2011 12:16 am

FighterAce wrote:The cap seems to be in two parts... the brass one holds the ball while the aluminum one is just an extension


Well spotted :)

A slightly modified cartridge version, with a removable rear cap. This would allow either the skirt of a diablo pellet type projectile to be flared against the walls to provide an effective seal, or a silicone sleeve to be inserted that would seal a hard projectile like a steel ball.
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Unread postAuthor: Gun Freak » Fri Aug 05, 2011 8:54 am

Jsr is there any way you can think of making the detent out of an oring rather than ball bearings, because that would eliminate the need for another seal. The only problem is I can't think of a way to hold it in.
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Unread postAuthor: saefroch » Fri Aug 05, 2011 9:51 am

Use a thick o-ring and recess it far into the walls?
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Unread postAuthor: Insomniac » Fri Aug 05, 2011 10:43 pm

Problem: Upon firing, those ball bearings are just going to fall out of their goove and be blown out the barrel with the projectile... :wink:
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Unread postAuthor: Crna Legija » Fri Aug 05, 2011 11:06 pm

Insomniac wrote:Problem: Upon firing, those ball bearings are just going to fall out of their goove and be blown out the barrel with the projectile... :wink:


he thought of that
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Unread postAuthor: jackssmirkingrevenge » Sat Aug 06, 2011 12:12 am

Gun Freak wrote:Jsr is there any way you can think of making the detent out of an oring rather than ball bearings, because that would eliminate the need for another seal. The only problem is I can't think of a way to hold it in.


I've been thinking about that for a while, it's not an easy proposition. Here's one way I had though up but it's too complex for my liking.
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