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Pneumatic Pen-gun Project

Built a miniature cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: qyuubi786 » Mon Sep 24, 2012 8:48 am

Will it help if the neoprene is more rough (causes more friction when I rub my finger against it)?
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Unread postAuthor: jackssmirkingrevenge » Mon Sep 24, 2012 3:15 pm

if the neoprene has a rough side and a smooth side, the smooth side should be the one which touches the breech.
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Unread postAuthor: iloveairguns » Tue Jun 18, 2013 4:23 am

didn't check if anyone already asked this (i know, i know...) but what material are muzzle and breech parts, i mean the silver color parts glued to the barrel? also sorry if im posting on some old topic.
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Unread postAuthor: jackssmirkingrevenge » Tue Jun 18, 2013 4:35 am

Aluminium, but I've had good results simply wrapping masking tape around the barrel and gluing the whole thing with araldite:

http://www.spudfiles.com/forums/mini-0- ... 20101.html

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Image

Good for 800 psi at least ;)
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Unread postAuthor: iloveairguns » Tue Jun 18, 2013 6:20 am

800 psi i wouldn't have thought a coax could do that but doesn't it already need a very rigid material for the chamber
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Unread postAuthor: jackssmirkingrevenge » Tue Jun 18, 2013 6:46 am

It's all about the ratio of diameter to wall thickness. An 80mm brass pipe with 0.5mm walls will bulge like a balloon if you put 800 psi into it, and 8mm brass pìpe with the same wall thickness on the other hand will handle it safely, having a diameter:wall thickness ration ten times higher.
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Unread postAuthor: iloveairguns » Wed Jun 19, 2013 3:10 am

ok didnt even know dat
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Unread postAuthor: iloveairguns » Sun Jun 23, 2013 5:58 am

and why are the pictures deleted
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Unread postAuthor: jackssmirkingrevenge » Sun Jun 23, 2013 1:02 pm

they were on my photobucket account, i had deleted a bunch of stuff.

here:
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Unread postAuthor: iloveairguns » Mon Jun 24, 2013 6:57 am

what else than masking tape could be used to make the cap to the end of the chamber
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Unread postAuthor: jackssmirkingrevenge » Mon Jun 24, 2013 7:03 am

I'm sorry, masking tape is really easy... if that is too much for you then maybe you shouldn't be making it...
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