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Full/Semi auto 27mm blowback bolt cannon. UPDATED new paint+

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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Full/Semi auto 27mm blowback bolt cannon. UPDATED new paint+

Unread postAuthor: jhalek90 » Wed Apr 20, 2011 7:28 pm

Cannon Specs:

27mm
semi/full auto (select fire, kinda.)
Blow back breech
7 round detachable spring loaded magazine
Main Valve: 1'' sprinkler valve, piloted by a pop off valve.


Photo:
Image

How the bolt works:
Image


How i did the detent and hopup:
Image


VIDEO:
[youtube]http://www.youtube.com/watch?v=kS6uHhV62cA[/youtube]

NEW PAINT+trigger+magazine changes:
[youtube]http://www.youtube.com/watch?v=mA0pmvfIX6M[/youtube]


Any Questions?
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Last edited by jhalek90 on Thu Apr 21, 2011 1:09 pm, edited 2 times in total.
jackssmirkingrevenge wrote:I wonder... if you put flammable vapours inside a lady... could you get her to diesel?

POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
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Unread postAuthor: Gun Freak » Wed Apr 20, 2011 7:33 pm

LOL bipod falls off...
That is really cool. It could use a redesign to make it prettier but as long as it functions! Good job. :)
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Unread postAuthor: warhead052 » Wed Apr 20, 2011 7:36 pm

Nice job. How did you get it to blow back?
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Unread postAuthor: jhalek90 » Wed Apr 20, 2011 7:42 pm

yeah i forgot the bipod screw. lol.

Blow back is now explained via a picture in the original post.
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jackssmirkingrevenge wrote:I wonder... if you put flammable vapours inside a lady... could you get her to diesel?

POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
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Unread postAuthor: warhead052 » Wed Apr 20, 2011 7:59 pm

Ok. Thanks! Yet again nice job on the gun. I would love to have one...
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Unread postAuthor: JDP12 » Wed Apr 20, 2011 8:05 pm

Wow.. very impressive! INcredibly simple design.. followin the KISS principle I like it! Nice job
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Unread postAuthor: ramses » Wed Apr 20, 2011 8:15 pm

Nice.

You know... If you used a 3 way valve for the trigger, you would have true semi auto.

And an air cylinder would make it cycle (better?). And if you hooked it up to a fridge compressor...

[/polandspud joke]

What are you using for your magazine spring? is the magazine sealed from atmosphere?
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Unread postAuthor: jhalek90 » Wed Apr 20, 2011 8:16 pm

ty. in the spirit of KISS during prototyping, the breech was held together with tape. lol

It exploded several times. very fun. After i got it working, i glued everything down. No more explosions.
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jackssmirkingrevenge wrote:I wonder... if you put flammable vapours inside a lady... could you get her to diesel?

POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
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Unread postAuthor: jackssmirkingrevenge » Wed Apr 20, 2011 11:36 pm

lol @ the detent, love it :) very nice overall, needs some tweaking but kudos on ghettting see what I did there it to work, brilliant!

ramses wrote:What are you using for your magazine spring?


Looks like a rubber band :D
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Unread postAuthor: POLAND_SPUD » Wed Apr 20, 2011 11:48 pm

Nice

If you used a 3 way valve for the trigger, you would have true semi auto.

And an air cylinder would make it cycle better. And if you hooked it up to a fridge compressor...
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 21, 2011 12:03 am

POLAND_SPUD wrote:Nice
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Unread postAuthor: ThornsofTime » Thu Apr 21, 2011 2:39 am

@JSR Hey... its a valid button... But you seem to have forgotten to "program" a standard "epoxy advice" button...
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 21, 2011 2:51 am

ThornsofTime wrote:@JSR Hey... its a valid button... But you seem to have forgotten to "program" a standard "epoxy advice" button...


Fine, in the interest of balance:
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Unread postAuthor: POLAND_SPUD » Thu Apr 21, 2011 7:33 am

you forgot about random innuendo and APFSDS rounds are so fuc#### awesome (let me post another pic of them) buttons :wink:

anyway you're just jealous...
you could have realized that 3 way valves are the way to go...
and now you're like 'uhhhh......... 3 way valves $#$#$'

...retards
JK

:D

[/offtopic]
I am surprised that it works so well... hmm
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 21, 2011 7:44 am

POLAND_SPUD wrote:APFSDS rounds are so fuc#### awesome (let me post another pic of them)


:laughing6:
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