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breech loading golf ball barrel 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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breech loading golf ball barrel questions

Unread postAuthor: jmccalip » Fri May 22, 2009 6:24 pm

I have the SDR21 sleeved in schd80 2" PVC. I was thing of doing a simple breech where I cut a hole for the ball, drop it in, and slide a coupling over it. I have two questions:

Do I need a special extra deep coupling, or will a normal one suffice? I'm worried about the strength here.

And how do I put o-ring grooves on a long barrel since I can't put the pipe on the lathe?

Thanks.
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Last edited by jmccalip on Fri May 22, 2009 10:24 pm, edited 1 time in total.
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Re: breech loading golf ball barrel questions

Unread postAuthor: Technician1002 » Fri May 22, 2009 10:22 pm

jmccalip wrote:I have the SDR21 sleeved in schd80 2" PVC. I was thing of doing a simple breech where I cut a hole for the ball, drop it in, and slide a coupling over it. I have two questions:

Do I need a special extra deep coupling, or will a normal one suffice? I'm worried about the strength here.

And how do I put o-ring grooves on a long barrel since I can put the pipe on the lathe?

Thanks.


Best for that is a repair coupling that slides on the outside. The repair coupling has gaskets. Just leave the nuts loose so it is easy to slide.
This is what it would look like in a 3 inch version.
[youtube]http://www.youtube.com/watch?v=9Klxqav_6NM[/youtube]

Since you are using round golf balls, a 2 inch ball valve can have the ball itself sleeved and drilled as a breech loader. Search for ball valve breech load.

The basic idea is here. You will need to modify it to fit golf balls.
http://www.spudfiles.com/forums/ball-valve-breech-load-t16048.html
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Unread postAuthor: dewey-1 » Sat May 23, 2009 4:48 pm

As tech mentioned about the compression coupling, I came across this company;

http://www.kbico.com/index.php?cPath=21 ... =5a&page=4

It appears most local hardware stores carry this brand, King Brothers.
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Unread postAuthor: jmccalip » Tue May 26, 2009 7:25 pm

dewey-1 wrote:As tech mentioned about the compression coupling, I came across this company;

http://www.kbico.com/index.php?cPath=21 ... =5a&page=4

It appears most local hardware stores carry this brand, King Brothers.


Ok, I bought one of these and tried it out on a 2" pipe, and it's hard as **** to move! Even after I lubed it, there's so much friction that it takes two arms just get it to budge. How is it so easy in that video?
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Unread postAuthor: Technician1002 » Tue May 26, 2009 7:57 pm

jmccalip wrote:
dewey-1 wrote:As tech mentioned about the compression coupling, I came across this company;

http://www.kbico.com/index.php?cPath=21 ... =5a&page=4

It appears most local hardware stores carry this brand, King Brothers.


Ok, I bought one of these and tried it out on a 2" pipe, and it's hard as **** to move! Even after I lubed it, there's so much friction that it takes two arms just get it to budge. How is it so easy in that video?


They are hard to move so they hold the pipe together in a repair. Loosen the nuts so the gasket is not compressed. In the video, they even went so far as to remove the original seals and leave one off and use an o ring with much looser fit. The o ring is not clamped at all, but simply blows up against the nut during the shot which seals it. For information on how this works, this video covers it well. It is very loose to move, but seals well.

[youtube]http://www.youtube.com/watch?v=BbDiZiRVrnk[/youtube]

If your pipe is a little big on the OD so the barrel of the coupling is sticking due to paint, etc, then a little work with sandpaper on a dowel will fix the coupling in a short time. :D
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