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Mitch has semi/full auto!

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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Mitch has semi/full auto!

Unread postAuthor: Mitchza89 » Tue Apr 21, 2009 10:41 pm

Well I finally got it going. My idea behind it not working was correct, I had too much flow going into the compressor hose. I just turned it down and it works perfectly.

The ROF isn't great but that's because the spring in there is the one of my blowgun that I ripped apart for the trigger.

Either way I'm still very happy with this even looking like Frankenstein's creation. I'll be looking forward to that rate of fire and about 350+psi :D


http://www.youtube.com/watch?v=tryQahZx4Ig Semi auto (Sorry about the swearing...)

http://www.youtube.com/watch?v=fryZ2mQeQ1s Full auto

All were done at 70 or so PSI
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Muzzle loading with 6mm bb's (my barrel is 8mm. It was all I had.)
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Unread postAuthor: Sparkie » Tue Apr 21, 2009 11:50 pm

Great job!
How are you planning to get 350+psi into it?

Also if you dont mind me asking, why is the air chamber so long?
Is it due to how you buy it that length at bunnings?
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Last edited by Sparkie on Tue Apr 21, 2009 11:56 pm, edited 1 time in total.
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Unread postAuthor: Mitchza89 » Tue Apr 21, 2009 11:55 pm

With either my homemade pump or a fridge compressor. Except I'm more then happy at 150-200. With the air chamber, it was all I could find at the time. i just quickly through it all together.

Thanks for the comment :)
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Last edited by Mitchza89 on Wed Apr 22, 2009 12:06 am, edited 1 time in total.
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Unread postAuthor: jackssmirkingrevenge » Wed Apr 22, 2009 12:02 am

lolol you couldn't be more Australian if you tried :D

I would suggest a smaller chamber, the one you have now seems a bit too overkill. Also, a magazine would be a great help ;)
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Unread postAuthor: Mitchza89 » Wed Apr 22, 2009 12:09 am

Yeah I'm planning on doing a top job tomorrow. Just redoing it all from the start. I'm still so glad it works.

I feel like a bit of a sheep at the moment with the amount of people doing the exact same thing though :D.
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Unread postAuthor: jackssmirkingrevenge » Wed Apr 22, 2009 12:12 am

Mitchza89 wrote:I feel like a bit of a sheep at the moment with the amount of people doing the exact same thing though :D.


That can't be a bad thing, I haven't seen a new vortex/cloud BBMG in ages :) the proper air machinegun has come of age!
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Unread postAuthor: jook13 » Wed Apr 22, 2009 12:13 am

Different things come in waves. Remember all the smallish hybrids? What about the pengun rush? Now it is semi auto. I am hoping the next big thing is huge 6 inch bore monstrosities.

It is cool how one persons achievements make that project seem so feasable. I would have never thought a piston valve the size of a pen would be feasable till I saw jsr do it for instance.
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Unread postAuthor: Mitchza89 » Wed Apr 22, 2009 12:14 am

That it has! I'm still more then likely going to place a spring behind the piston as well as an equalization hole into it so I can place a homemade pump straight where the chamber is. I'd love to achieve 400+psi on the move and in no time at all.

Jook, you make a great point. I myself would love to see guns shoot cans of food at stupid velocities :D.
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Unread postAuthor: jackssmirkingrevenge » Wed Apr 22, 2009 12:25 am

jook13 wrote:I am hoping the next big thing is huge 6 inch bore monstrosities.


I live in an urban area, therefore large projects are impractical. When I made this project it was about the upper limit in terms of power and size that I could have around the house and garden, so instead of going bigger and better I tend to focus on smaller, more efficient, repeating etc.
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Unread postAuthor: Mitchza89 » Wed Apr 22, 2009 12:29 am

Ahh yes I remember that gun back in the day and how I thought I'd never make anything beyond a ball valve gun..


....How times change :D
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Unread postAuthor: jook13 » Wed Apr 22, 2009 12:32 am

That is kinda sad. I understand it would be tough to build something big when living in an urban area. I guess I take for granted living in the middle of nowhere Arizona where the cops think my big ass cannons are cool and ask how much for me to make them one. I lived in a large city when going to college (Phoenix AZ) and I have made a promise to myself that I will never live in one again. Thank god my wife agrees.

But still, you have to admit that cannons that big are awesome to watch videos of.
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Unread postAuthor: jackssmirkingrevenge » Wed Apr 22, 2009 12:34 am

Mitchza89 wrote:...How times change :D


Oh yes... ten years ago this was the pinnacle of my achievement and I was amazed at how I could penetrate a CD case :roll:

All this because I discovered marine epoxy, fate I tell you! and friends in the yachting industry :D
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Unread postAuthor: Technician1002 » Wed Apr 22, 2009 12:35 am

jackssmirkingrevenge wrote:
jook13 wrote:I am hoping the next big thing is huge 6 inch bore monstrosities.


I live in an urban area, therefore large projects are impractical. When I made this project it was about the upper limit in terms of power and size that I could have around the house and garden, so instead of going bigger and better I tend to focus on smaller, more efficient, repeating etc.


It's why I use marshmallows. They don't hurt anything if you get a few over the fence. :) But close in.. Pow.

:oops: Maybe marshmallow ammo doesn't fit the BBMG thread. sorry
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Unread postAuthor: jackssmirkingrevenge » Wed Apr 22, 2009 12:38 am

jook13 wrote:But still, you have to admit that cannons that big are awesome to watch videos of.


No doubt about it, I'm jealous! How much are green cards :D

Technician1002 wrote:It's why I use marshmallows. They don't hurt anything if you get a few over the fence. But close in.. Pow.


Indeed, the spudgun equivalent of a glaser slug;)
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Unread postAuthor: Mitchza89 » Wed Apr 22, 2009 12:44 am

I usually shoot off my spud guns at my friends house. He has been mucking with black powder guns for years no his neighbors are used to it. a fully auto gun going BAM BAM BAM! doesn't seem to even phase them... neither did my 3/4'' piston gun going off with no barrel at 350psi. Damn that was a bad idea with no hearing protection.
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