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coaxial.piston.

Built a pneumatic 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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coaxial.piston.

Unread postAuthor: FORE!!!! » Fri Aug 21, 2009 3:35 am

Well here is my first coaxial piston gun, its made from aluminium tubing, i found in side a laser printer refill cartrigde ( the main roller,the green tube) with a 5 mm barrel (bore) 4mm,refill is via quick connect and is piloted by a blow gun.. the piston is made from a timber broom stick cut to size with a neoprene sealing face and semi-resessed o-ring ,all joints are epoxy resin
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Attachments
21-08-09_1809.jpg
here she is...
21-08-09_1818.jpg
another angle
21-08-09_1819.jpg
and again
al-xg wrote:
I've used various things like cutting oil, silicone lubricant, even butter

jsr wrote:
This collection of containers on your bedside table must look very intimidating to any visiting young ladies

...but hey, lube shows you care;)
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Unread postAuthor: jackssmirkingrevenge » Fri Aug 21, 2009 5:41 am

Epoxy FTW!

:D

I always wanted to use one of those printer tubes for something. What pressure are you running at? Small calibres usually perform best in the 250 psi+ range.
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Unread postAuthor: inonickname » Fri Aug 21, 2009 6:14 am

Cool..

I'm designing two co-axials at the moment, one in the 400-800 psi range (.38 cal) and one in the 800-1200 psi range (.75 cal, 750+ Ft/lb!).

Is it serviceable? may be something to consider in the future.
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Unread postAuthor: Mr.Sandman » Fri Aug 21, 2009 6:58 am

I think you would find it more comfortable if you switched the blowguns place with the quick connect. Oveall nice gun like the shiny barrel. Hows it in the power department?
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Unread postAuthor: qwerty » Fri Aug 21, 2009 8:03 am

Cool. Check out mine. :)
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Unread postAuthor: clemsonguy1125 » Fri Aug 21, 2009 12:23 pm

what are the barrel spacers
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Unread postAuthor: jmadden91 » Fri Aug 21, 2009 10:57 pm

Nice gun mate. What epoxy resin do you use FORE!!!?
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Unread postAuthor: FORE!!!! » Sat Aug 22, 2009 12:20 am

thanx. I was a little disapointed with its performance because im limited because of my compressor to 145-150psi,itll put a shish kabab stick through a cardboard box ,but thats about it.

The epoxy i used was panal metel to hold a 1/2''x1/4'' threaded reducer inside the tube and then it had a further coat of epoxy,araldite eqivelant slow cure on the outside for a nice coating on the panel metel.
the front end cap was just plain epoxied no panal metal.

spacer looked like this=
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Attachments
spacer.jpg
spacer
spacer.jpg (21.84 KiB) Viewed 1312 times
22-08-09_1518.jpg
the piston
al-xg wrote:
I've used various things like cutting oil, silicone lubricant, even butter

jsr wrote:
This collection of containers on your bedside table must look very intimidating to any visiting young ladies

...but hey, lube shows you care;)
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