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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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Poll ended at Thu Mar 01, 2007 7:32 pm

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Total votes : 20
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Unread postAuthor: chaos » Sat Mar 10, 2007 1:11 am

ok ive got my new blowgun on everything is perfect atm i still have some problems at the 200-260psi mark the sealing face keeps blowing off the piston, does anyone else get this? anyways ill get the pics up later.

peace chaos
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Unread postAuthor: CpTn_lAw » Sat Mar 10, 2007 4:44 am

yes
i've got this problem too...the problem with pistons, is that you need'em light and hard. But, unless you get them out of aluminium and thick neoprene, they will loose they're sealing surface. epoxy works great as a glue, and you can also think about burning the neoprene on the side glued to the piston body, and when it starts bubbling, you put it back on. wear gloves and a breathing mask.my piston rifle is broken because of that problem...
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Unread postAuthor: chaos » Sat Mar 10, 2007 5:52 am

Yer ok 2bad yours is so kool anyways my piston made with a bolt and 2 rubber washers ill get pics of this up 2 its to hard to explain.the rubber is 5mm thick so yer as i said ill get pics up of this aswell. but either than that it seems consistent at 140-160psi so ill keep it there until i sort this out.

peace
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Unread postAuthor: spudthug » Sat Mar 10, 2007 7:48 am

wow how fast does that thing shoot at 200 psi??what do u usually shoot out of it??
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: Hotwired » Sat Mar 10, 2007 8:12 am

Is the rubber getting ripped off the piston?

It could be the metal sealing port is digging into the rubber enough to tug on the edges as the centre (where it's being held by the bolt) is yanked backwards.
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Unread postAuthor: chaos » Sat Mar 10, 2007 8:18 pm

spudthug wrote:wow how fast does that thing shoot at 200 psi??what do u usually shoot out of it??

umm pretty damn fast, i cant see the marble at all.



Hotwired wrote:Is the rubber getting ripped off the piston?

It could be the metal sealing port is digging into the rubber enough to tug on the edges as the centre (where it's being held by the bolt) is yanked backwards.

i doubt this is the problem, i have "experimented in the shed lately and foun it was due to the shape and size of the nut a washers i used its all good now i think. although i have only shot it once at 240psi after changing the nut and washer, it work and i was able to shoot it again.
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Unread postAuthor: chaos » Sat Mar 17, 2007 4:32 am

Alrighty... i found that the cause of the problem was due to the rubber being "to thick". im now using 3mm laced insertion rubber that i got for around $20 a sheet. hope this helps anyone with these problems.

anyways i now have "interchangeable" barrels. its basically a 8mm id aluminum arrow bolt with 2 pieces of hose on each end then held in by 3 modified bolts(cut down to length).

also removed gauge due to it was broken from the extreme pressures

peace
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Unread postAuthor: integral » Sat Mar 17, 2007 5:17 am

omg man ur rifle is insane

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Unread postAuthor: chaos » Sat Mar 17, 2007 5:27 am

well technically its not a rifle....Yet. i plan to get a 16.5mm piece of sharpened tungsten and etch a spiral into the barrel.

but thanks for the comment mate and welcome to spud files seeing that your new, do you have any cannons?

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Unread postAuthor: integral » Sat Mar 17, 2007 7:05 pm

just gotta wait untill exams are over and the build process for my pneumatic can begin. got a lot of help and inspiration for this site, so hopefully i can do it justice.
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Unread postAuthor: chaos » Sat Mar 17, 2007 8:39 pm

kool as man good luck wiv your exams, and even better your for your pneumatic gun.


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Unread postAuthor: whittingstall » Mon Mar 19, 2007 8:05 am

Evidence: Rifle design, all metal, huge psi rating, comfy butt, scope.
Verdict: Sweetest gun ever.
Congrats, I think my pneumatic just went into hiding...
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Unread postAuthor: chaos » Tue Mar 20, 2007 12:18 am

whittingstall wrote:Evidence: Rifle design, all metal, huge psi rating, comfy butt, scope.
Verdict: Sweetest gun ever.
Congrats, I think my pneumatic just went into hiding...


Oh, thanks mate for the comment. have you a gun posted or are you saving it for the contest?

peace
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Unread postAuthor: chaos » Tue Mar 20, 2007 7:12 pm

Well i have scraped this gun due to many design faults you can see my post for my new gun HERE


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Unread postAuthor: medic » Sat Mar 24, 2007 7:50 pm

By far my favorite rifle i've eva seen, im thinking of makin one just like it once i finally finish my first one,
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