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How to get full auto / semi auto

A place to ask general spud cannon related questions.
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How to get full auto / semi auto

Unread postAuthor: Tostitos » Fri Jul 28, 2006 12:29 pm

After only around an hour looking into it, it's obvious that the only way people will get reliable semi or full auto is to build somewhat complex spring and piston operated systems, just like a paintball gun.

It won't just be a PVC construction with a valve here and a sliding section there.

All it will take is scaling up the mechanism and adjusting the feeding system to be positive feed from below. I will post some animations of how paintball guns operate in a second.
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Unread postAuthor: WOW!! » Fri Jul 28, 2006 12:42 pm

Why not use a pressure switch and a sprinkler valve? And why do you have a binary(?) code at the bottom?
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Unread postAuthor: boilingleadbath » Fri Jul 28, 2006 12:45 pm

"It won't just be a PVC construction with a valve here and a sliding section there. "

Oh, so we have a challenge now, do we?!
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Unread postAuthor: M3NT4L » Fri Jul 28, 2006 12:55 pm

Hey i have an idea why dontyou make one and we can all learn from it :roll:
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Unread postAuthor: Tostitos » Fri Jul 28, 2006 2:57 pm

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Unread postAuthor: Mihlrad » Fri Jul 28, 2006 4:51 pm

i hate to break it to you, but a paintball gun functions far differently than anything you can do with PVC due to pressure restrictions. The reason a paintball gun can go semi and full auto is partly due to the valve system but is mainly due to the fact that it has a constant high pressure supply of air/co2. A co2 tank i am unsure of the pressure it can contain but i heard its like 800-2000 or something in that range dont quote me. A HPA tank, what nubs call nitrous (haha newbs are anoying) can run at FAR higher psi and contain FAR more air supply. These tanks can hold up to 4500 psi of air safely, in pvc that much pressure, your dead. Having an HPA or CO2 tank basically hooked up to a pvc spudgun, is basically like having an air compressor attached to your gun. The reason a cloud bbmg can function as it does is due to the constant air supply. In theory if you could manage to get the pvc to hold a VERY large amount of air due to the fact that it cant be pressurized such as a co2 or hpa, you could achieve full auto with the proper valve system to close the air supply immediately after each shot is fired. If you had a very good valve you could do it with regular bike pump pnuematics, but the amount of power you would get out of each shot, would decrease each shot and would be like 10 feet of range for the first shot, and just get less and less. GL if you figure out how to build it, please share.

Heres a semi auto pnuematic made by one of our members

http://www.spudfiles.com/forums/viewtopic.php?t=160&

It is pretty complicated and uses springs like you stated. It also has a compressor hooked to it.
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Unread postAuthor: sgort87 » Sat Jul 29, 2006 7:27 am

<a href="http://www.spudfiles.com/forums/dload.php?action=file&file_id=38&">Uhhh...</a>
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Unread postAuthor: boilingleadbath » Sat Jul 29, 2006 10:47 am

Ok, so change the damn dimentions of the hammer valve.
Ohhhh... SO hard to do.

Yeah, flow wouldn't be excellent... but that's acctualy a good idea, is it not?
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Unread postAuthor: singularity » Sat Jul 29, 2006 11:22 am

mihlrad dont paintball guns regulate the 800 to 2000 psi down to lower pressures like in the 200 to 300 psi range, im not sure but i seem to remeber someone telling me that.
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Unread postAuthor: boilingleadbath » Sat Jul 29, 2006 12:51 pm

The better ones do regulate the pressure down, but the cheap ones don't.
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Unread postAuthor: Mihlrad » Sat Jul 29, 2006 2:49 pm

something like a tippman does not, something like my proto matrix does, the tippman is directly fed with air, whereas the proto matrix i have has a hose running from the tank into a LPR, low pressure regulator, whcih is shaped into a front handle for the gun, but in reality is what controls the pressure regulation of the gun. The thing about using pressurized PSI pipe vs HPA tanks, is that after every shot from the pvc tank, the shots will decrease in power, in an hpa tank each shot is as good as the last, until you get to about 500 psi if you have a good tank that is. A pvc tank just cant hold the pressure required to have significant consecutive shots.
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Unread postAuthor: Benny » Sat Jul 29, 2006 7:08 pm

Check out spudshots S.A.F.E.
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Unread postAuthor: Shrimphead » Sun Jul 30, 2006 12:42 am

Just hook up a regulated co2 system and use a pressure sensor like on BCPneumatic's auto golf ball gun and you could crank out those paintballs or whatever so fast!
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