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SpudFiles Forum Index » Pneumatic Cannon Showcase » Basic Tennis Ball Cannon
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MrCrowley
PostPosted: 08/09/2010 1:36 AM    Post subject: Basic Tennis Ball Cannon Reply with quote

Kaleun
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Joined: 23 Jun 2006
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Just a little something I made with one of the 2" sprinkler valves I picked up. Even though the valves are 27 years old, they cleaned up really well and this one works fine. Not anything special really, just a 2" sprinkler valve (guide rod removed, piloted by 1/2" ball valve), a 3'x2" chamber and a 3.3' tennis ball cannon (65mm PN12 PVC). Also fits soda cans perfectly.

Can't be bothered painting it, this is just a fun cannon to use everynow and then. Pressure gauge has since been added. GGDT says 120m/s muzzle velocity with a tennis ball.

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wyz2285
PostPosted: 08/09/2010 2:41 AM    Post subject: Reply with quote

Brigadier General
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looks good,well done.the valve is 27 years old Surprised !?
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SpudBlaster15
PostPosted: 08/09/2010 11:25 AM    Post subject: Reply with quote

Hybridian
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Damn, that thing is cleanly built.

That is all. Razz
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MrCrowley
PostPosted: 08/09/2010 14:16 PM    Post subject: Reply with quote

Kaleun
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Very Happy

By the way, 100 spudbux to anyone who can guess from which cannon of mine the 1/2" ball valve and 2" chamber came from. Wink
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MrCrowley
PostPosted: 08/13/2010 1:53 AM    Post subject: Reply with quote

Kaleun
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Two new videos + two new photos.

Link


Link

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Surprisingly, I still can get it to seal and pump it up in under a minute with a track pump.
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jackssmirkingrevenge
PostPosted: 08/13/2010 2:16 AM    Post subject: Reply with quote

aspiring machinist
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Fantastic stuff!

Since you have the benefit of using half soda cans as perfect lightweight sabot, I think some buckshot rounds are in order Very Happy Very Happy Very Happy
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MrCrowley
PostPosted: 08/13/2010 2:21 AM    Post subject: Reply with quote

Kaleun
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jackssmirkingrevenge wrote:
Fantastic stuff!

Since you have the benefit of using half soda cans as perfect lightweight sabot, I think some buckshot rounds are in order Very Happy Very Happy Very Happy

Now that I think about it, I do have ~100 1/2" lead fishing sinkers... Very Happy

Any suggestions on the loading? I'm thinking half a soda can with a dozen sinkers and a plastic bag scrunched up at the front to keep them in...
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jackssmirkingrevenge
PostPosted: 08/13/2010 2:28 AM    Post subject: Reply with quote

aspiring machinist
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That would have been my first suggestion, make sure that they care evenly distributed and pressed against the bottom of the can so that they won't destroy the sabot on firing...
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Zeus
PostPosted: 08/13/2010 5:16 AM    Post subject: Reply with quote

Colonel
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I like this, a sprinkler valve to pilot a sprinkler valve.

Should use a piston valve.

No primer stain. Praise the Lordy
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MrCrowley
PostPosted: 08/13/2010 5:23 AM    Post subject: Reply with quote

Kaleun
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Zeus wrote:
Should use a piston valve.

Hence the basic part haha. I probably could've saved quite a bit of money by just making a tennis ball barrel for my VAL cannon (1.5" porting piston valve) but I wanted something portable (can't get the piston to seal on the VAL using a track pump since I added the 1" sprinkler valve to pilot it) and I had four 2" sprinkler valves to use Razz

Trivia: At my local plumbing store, they wanted $50NZD for a 65mmx50mm bushing (for the barrel), so instead I heated up the end of the barrel and a 50mm slip-socket male threaded adapter and managed to get it to fit inside the 65mm barrel and then once it cooled I removed it and glued it in.
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Zeus
PostPosted: 08/13/2010 5:34 AM    Post subject: Reply with quote

Colonel
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I meant as a pilot, because it's normally the other way around.

Just my sense of humour.

MrCrowley: Sticking it to the ripoff merchants.
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MrCrowley
PostPosted: 08/13/2010 5:38 AM    Post subject: Reply with quote

Kaleun
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Zeus wrote:
I meant as a pilot, because it's normally the other way around.

Just my sense of humour.

Ahh I see. Yeah I probably could. Only reason I changed from ball valve to sprinkler was ease of trigger. GGDT says no noticable performance increase though.
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SpudBlaster15
PostPosted: 08/13/2010 11:19 AM    Post subject: Reply with quote

Hybridian
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Nice videos. I second JSR's buckshot round suggestion. A half soda can sabot and a couple dozen marbles would be interesting.
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MrCrowley
PostPosted: 08/14/2010 6:36 AM    Post subject: Reply with quote

Kaleun
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Didn't have the chance to do a buckshot today but I did have some more fun with soda cans:
(may be still processing on YouTube...)

Link
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SpudFarm
PostPosted: 08/14/2010 6:46 AM    Post subject: Reply with quote

Captain Slow
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Nice!
I just had to comment on your hipfire skills :O You should belong to the mafia..

Other then that, is there any way you could get your hands on one of the Casio high speed camera series? I would love to see those soda can sabots exiting the barrel.
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