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New Piston BB Gun

Built a BB Machine Gun? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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New Piston BB Gun

Unread postAuthor: Sergeant Dotson » Sun Mar 16, 2008 6:10 pm

I just recently finished this bb gun. It has a piston made of hot glue attached to what is a hammer that strikes the BB in the barrel. I will glue the casing together and give it a new paint job soon but I'm going on a trip so it will be about a week. These pics should explain it all.
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Attachments
IMG_0919.jpg
Piston.
IMG_0920.jpg
Piston and spring.
IMG_0921.jpg
Barrel.
untitled.JPG
Cut in half view. Basically, when air is applied, it pushes the piston off the solid metal (which blocks the the air from escaping through the tube). Then the tube hits the bb in the barrel. Since the piston is off the piece of solid metal, it allows the air to escape after the bb has been hit.
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Unread postAuthor: Cosmic Muffin » Mon Mar 17, 2008 5:39 am

hmmm i like the idea but its been done about 3 times still it shood be good
you just need a loading system
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Unread postAuthor: OuchProgramme » Mon Mar 17, 2008 6:43 pm

Cosmic Muffin wrote:hmmm i like the idea but its been done about 3 times still it shood be good
you just need a loading system


Gravtiy fed mag :)
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Unread postAuthor: elitesniper » Mon Mar 17, 2008 6:50 pm

cool, but is that barrel a pen tube? or...
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Unread postAuthor: Sergeant Dotson » Tue Mar 18, 2008 3:56 pm

No, the barrel is all thread and I am going to cut the barrel and put in a t connector for a gravity fed mag. :D
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Unread postAuthor: ghostman01 » Tue Mar 18, 2008 4:29 pm

looks like jacks semi
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Unread postAuthor: Antonio » Fri Jun 20, 2008 4:13 am

Its like the blowforward breech system. But I think this one has less turbulance as the path of the air is a straight line. I think your piston parts look a bit too heavy though. I mean u dont wanna loose energy by pushing that piston forward> u want to use it to propel the projectile.
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Unread postAuthor: jackssmirkingrevenge » Fri Jun 20, 2008 6:28 am

ant wrote:Its like the blowforward breech system. But I think this one has less turbulance as the path of the air is a straight line.


It's pretty much the same thing.

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You'll be needing a longer barrel for significant power at compressor pressures though.
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Unread postAuthor: Antonio » Fri Jun 20, 2008 7:18 am

jackssmirkingrevenge wrote:
It's pretty much

You'll be needing a longer barrel for significant power at compressor pressures though.


Ah k I am sorry, I thought yours had holes at the side op te sliding part.
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