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Semiautomatic tennisball gun

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Semiautomatic tennisball gun

Unread postAuthor: colty-bear » Tue Mar 17, 2009 5:35 pm

I am currently working on a semiautomatic tennisball gun. I first got the idea watching Rob Dyrdeck's Fantasy Factory when i saw his. After that I did some research looking for valves that vould be able to fire semi automaticly. I knew or had an idea for the tank i would hook an air hose nipple straight to the tank and just leave the hose to the tank then after firing it would automaticly fill up again. But as for valves I was thinking of using a supah valve. Is it capable of firing over and over? I will use a 2.5 tee for loading and a 2.5 sch 40 pipe for barrel.
thx
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Unread postAuthor: Lentamentalisk » Tue Mar 17, 2009 8:58 pm

There is next to nothing on this site that can't fire more than once. The problem is getting it to fire rapidly. Assuming you have a gargantuan compressor or air source, then you could probably fire a shot every 1-3 seconds, given a proper filling setup and all.
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Unread postAuthor: colty-bear » Tue Mar 17, 2009 9:00 pm

So what your saying is if i put a supah valve hooked up to it then had a comressor always hooked up to it i could fire it every 3 seconds?
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Unread postAuthor: spudtyrrant » Tue Mar 17, 2009 9:36 pm

joel has a semi tennis ball gun with the supah as the valve already http://www.spudtech.com/movies/asf/MOV00002.MPG
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Unread postAuthor: chrissilvermancs » Wed Mar 18, 2009 12:02 am

i am also working on a tennis ball gun but they are probably using a industrial size air compressor and pneumatic butterfly valves in the show but it is vary possible to make a semi tennis ball gun the main thing about semis and automatics is not to use all the air in the chamber.

if you not looking for ingenuity copy the cannon on the front page GB semi i don't know y people here are saying that there are not that many semis.

just scale up the designs and there's your cannon. although if you do go that way you have to either have spring loaded mags or dermal down the pipe for the mag so the tennis balls drop!

other wise im going to make a scale model of my automatic tennis ball cannon after im done with the designs and if it works i will post them (might take awhile)
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Unread postAuthor: SEAKING9006 » Wed Mar 18, 2009 12:29 pm

They say that because there AREN'T that many semis. The GB Semi is one of the only ones we have. And the one Joel made isn't semi, it's bolt action and it fills kinda slow. You need HIGH flow into the chamber to get semi on a tennis ball level.
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Unread postAuthor: colty-bear » Mon Mar 23, 2009 2:40 pm

Ok i got new news I was looking at supah valves and the newer models dont have springs on piston i was thinking the one with the spring is the one i need so i can have a constant air feed to the chamber... Anybody know where i can get a supah valve with a spring in it like this one?

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Unread postAuthor: SEAKING9006 » Mon Mar 23, 2009 5:26 pm

No need for a spring. It fills as it is.
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Unread postAuthor: colty-bear » Mon Mar 23, 2009 7:03 pm

so if i had a new supah model and a constant feed to the chamber it would shut itself off and let air compress into the chamber?
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Unread postAuthor: daniel323 » Mon Mar 23, 2009 7:09 pm

I first got the idea from Rob Dyrdeck's Fantasy Factory




I love that show
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Unread postAuthor: colty-bear » Wed Mar 25, 2009 8:51 pm

UPDATE: I have a bad diagram here

Image


will it work?

p.s sorry if you cant see
they are labeled 2 1/2 pipe, 3 inch pipe, supah valve, tennisball feed, and air hose nipple for constant compressor feed.-you are all smart with this stuff so I think you can figure out where they all go together

It was this or i draw a picture and take a picture of it--HA!
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Unread postAuthor: DonTheLegend » Wed Mar 25, 2009 9:14 pm

Sort of, probably. You're going to need an extremely large air source to fill this fast enough to allow you to fire again in 3 seconds. Also, you won't be able to leave it connected to air the entire time without some sort of modifications.

Once the valve opens, it will stay open until the chamber is empty and then it will reseal and you can start filling again. I'm not sure how the new supahs fill because the spring is what allowed the old ones to fill from the chamber side. Without it I would think it would have to fill from the pilot side? (Someone correct me if I'm wrong). If it fills from the pilot side, the small volume would mean it would make it virtually impossible to leave an air source connected the entire time and still fire the gun.

If you had a supah with a spring (or added it yourself) you would probably be able to leave the air source connected constantly to the chamber side. You would waste a lot of air, but you could probably make it work. Basically the valve would open until the spring could overcome the pressure flowing into the chamber and reseal. Then it would equalize normally until ready to fire again.

You would also have to figure out to feed ammunition. A bolt of some sort would probably be easiest. Overall though, 3 seconds is awfully fast to manually cycle a bolt and refill a chamber and shoot again. I think 10 seconds would be more realistic.
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Unread postAuthor: colty-bear » Wed Mar 25, 2009 9:20 pm

Yes i see i wonder if any one would sell me a springed supah on here. But as for filling i will have a nipple with a hose directly on there and then it will fill automatically after firing. For the ammo drill a tennisball sized hole in the barrel then dremel out a tee glue on the barrel so the tee is lined up with the hole and have a spring fed tube of tennisballs.

Ill put up a wanted post now
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Unread postAuthor: DonTheLegend » Wed Mar 25, 2009 9:27 pm

Would probably be easier to just add a spring to a new one... Most people here build their own valves, but you might find someone who has an old supah they're looking to sell.

How big of a chamber are you thinking of using? You say 3" diameter in the drawing but how long? You're going to have to make sure that your spring fed tube doesn't double feed or something similar before the valve reseats itself. This could probably be solved without too much trouble, but it's something to keep in mind.
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Unread postAuthor: colty-bear » Wed Mar 25, 2009 9:30 pm

Yea, it would be an easy fix. I was going to use between 20-23 inches of 3 inch pvc piping
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