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Golfball cannon questions.

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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Golfball cannon questions.

Unread postAuthor: Stolly32123 » Tue Aug 10, 2010 6:05 am

This weekend im making a simple pneumatic golfball cannon. What i want to know is what the minimum volume/length my pressure chamber needs to be to get a good result out of the cannon.

The barrel is 1m 40cm (4Foot 7In) long (i can allways shorten it)
and for the pressure chamber i plan to use 50mm pipe which is rated to about 200psi. i will only be using it 100-150.

Also i was wondering where is can get a cheap sprinkler valve in australia. i tried the add on the site for <13 dollar sprinkler valves but they don't ship to australia, and if i get it off the internet i don't think it would get here in time.

Thanks for your help!
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Unread postAuthor: Crna Legija » Tue Aug 10, 2010 7:30 am

bunnings sell sprinkler valve. i would go for a 1.2:1 C/B ratio. and dont shorten your barrel, longer is better (try not jsr) :D :D
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Golfball barrel

Unread postAuthor: Technician1002 » Tue Aug 10, 2010 11:31 am

Definitely don't shorten it. Good performance can be had with high pressure and a moderate size chamber. Here is my Marshmallow cannon. I have a selection of screw on barrels for various ammo sizes. The golfball barrel is the one attached to the launcher in this photo.
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Marshmallow barrels.JPG
Marshmallow cannon and barrel collection
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Unread postAuthor: Gun Freak » Tue Aug 10, 2010 12:41 pm

DO NOT cut the barrel, leave it as long as possible. Why don't you try making a 2" piston valve? It is very simple and probably the best valve to use for a golf ball gun (Don't wanna hear it, Tech :D )
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Unread postAuthor: Stolly32123 » Tue Aug 10, 2010 4:54 pm

I might make a piston valve. but how would i make the piston?
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Unread postAuthor: Gun Freak » Tue Aug 10, 2010 5:17 pm

For a 2" piston, the easiest way would be a 1.25" coupling with plugs on each end. Then, bolt on yourr rubber sealing face and wrap it with duct tape until it fits, or if your feel like it, add o-rings for a tighter fit. Have a look at Superna, my first 2" piston cannon for a more detailed look at a 2" piston valve, also the Hubb Library has a link on how to make a 2" piston with a built in check valve, like mine. The check valve prevents backflow into the pilot area from the chamber, so the cannon loses less air and opens quicker.
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Unread postAuthor: clemsonguy1125 » Tue Aug 10, 2010 5:20 pm

A simple how to for the entire gun including 2 pistons
http://www.instructables.com/id/Golfbal ... That-Shoo/
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Unread postAuthor: BeaverRat » Tue Aug 10, 2010 7:47 pm

A great piston material for a 2 inch piston valve is 2 inch UHMW Plastic Rod from McMaster... The ID for 2 inch SCH 40 PVC is 2.047, so a 2 inch rod is a very nice fit with one wrap of electrical tape.

Site: http://www.mcmaster.com/#

Part Number: 8701K49
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