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My Golf Ball Cannon.

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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My Golf Ball Cannon.

Unread postAuthor: hyperspaz » Sun Apr 03, 2011 1:17 am

This is not my first gun, but it is the first one i am willing to take the time to post on Spudfiles :o . It has a 2" serviceable piston valve and a 1" sprinkler valve as the pilot. (the pilot is maybe just a bit overkill haha) The golf ball barrel is made from sleeved 2" pipes. Being that i live in a residential neighborhood with a tiny backyard, i have not yet been able to test the range, but i do have some damage shots. Well, tell me what you all think!
Image

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I found that if I shoot golf balls at around 25 psi they actually get stuck in my 1" board.

Image

These 2 big holes were shot at 40 psi, and the one smaller hole is from a ball bearing that i shot with a sabot at about 40 psi.

Image

[youtube]http://www.youtube.com/watch?v=rE4OoLENMT4&feature=player_embedded[/youtube]

It recently broke :((, but i caught it on tape.

[youtube]http://www.youtube.com/watch?v=carYeOI4OQk[/youtube]
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Last edited by hyperspaz on Mon Apr 18, 2011 5:41 pm, edited 2 times in total.

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Unread postAuthor: loganc58 » Sun Apr 03, 2011 1:22 am

How difficult of a time did you have sleeving the 2"?

Very nice, though. Looks very good!
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Unread postAuthor: hyperspaz » Sun Apr 03, 2011 1:34 am

Sleeving the 2' was definitely the most laborious part. i made a tourniquet to squeeze it in while i bashed it with a hammer. Took me like an hour and a half to get it in all the way. If your looking to sleeve a 2" i would recommend using some kind of grease or lube.
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Unread postAuthor: starman » Sun Apr 03, 2011 1:58 am

Orrr..find yourself some SDR 21, 1.5", which perfectly fits a golfball and sleeve it with Sch 80 2"...which also perfectly fits the SDR 21. Awesome golfball barrels!
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Unread postAuthor: jackssmirkingrevenge » Sun Apr 03, 2011 2:22 am

Not bad and quite a monster for a residential neighbourhood. Assuming it's all pressure rated it should be taken to at least 100 psi ;)
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Unread postAuthor: mark.f » Sun Apr 03, 2011 9:11 am

Looks good! Glad to see you were able to accomplish sleeving the barrel.

Any more details as far as chamber and barrel sizes, piston construction, etc.?
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Unread postAuthor: saefroch » Sun Apr 03, 2011 10:06 am

That is a beast. Awesome build!

I recommend high pressures, up to the pressure rating (whatever that be).

Since you live in a residential neighborhood, have you done any investigation into how far away it is audible from? I know my Trident at 1,000psi is almost deafening for the shooter without ear protection, but can't be heard inside the house. I'm curious if the same applies to your build...
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Unread postAuthor: Technician1002 » Sun Apr 03, 2011 11:05 am

SDR21 fits in 2 inch ABS just fine. I use an insert in my 2 inch ABS barrel to shoot golf balls.

Removable golf ball sleeve.
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For more power, I use a sabot with the 2.5 inch barrel. :D
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Unread postAuthor: hyperspaz » Sun Apr 03, 2011 12:53 pm

It's all pressure rated, one of the main reasons I havent taken it past 40 psi is the noise. And the other reason is that ive been using a hand pump, since my compressor is trapped in the middle of my garage which is filled with boxes from moving. As for why I didn't use sdr 21, I couldn't find it at any local plumbing shop, and all the online stores had ridiculous shipping costs.
My piston is kinda ghetto right now, I'm hoping to build a new one out of epoxy soon. My last epoxy piston shattered, because i didn't have a very good bumper, and because I decided to make it hollow to reduce the weight.
Oh and one more thing, How much pressure can a sprinkler valve take? I'm always reluctant to pump them past 80 psi.
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Unread postAuthor: jrrdw » Sun Apr 03, 2011 2:15 pm

Thump! :shock: Win! :lol: What do you call it? Did you give it a name?
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Unread postAuthor: saefroch » Sun Apr 03, 2011 2:47 pm

Erm... as I said before, have you had anyone stand 40ft or so away and tell you how loud it seems? I've found that the muzzle blast from my builds dissipates a lot over distance, but that might be because of the small displaced volume.

What's your current bumper made out of?

I'd check the pressure rating on the sprinkler valve first, then go from there.

Sounds like you've got some experience with pneumatics before becoming very active :) quite a plus.
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Unread postAuthor: Gun Freak » Sun Apr 03, 2011 5:01 pm

The gun looks like all the parts will have no trouble with 120 psi. And the pilot valve isn't overkill, because your pilot volume is massive :lol: Good job on it! :)
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Unread postAuthor: JDP12 » Sun Apr 03, 2011 5:04 pm

Wow.. awesome gun. I love it
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Unread postAuthor: hyperspaz » Sun Apr 03, 2011 5:57 pm

@saefroch My backyards not even 40 feet haha, so no i havent tested the sound yet, but i'll make sure i let you know when i do. Heres a picture of my current piston, it has a 1/4" rubber bumper.

Image

Do you have any suggestions for a bumper when i get round to making another epoxy piston?
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Unread postAuthor: JDP12 » Sun Apr 03, 2011 6:19 pm

i hear tennis/raquet balls work good
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