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Making a breech loader for my golf ball launcher

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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Making a breech loader for my golf ball launcher

Unread postAuthor: jsefcik » Sun Jul 17, 2011 12:12 am

I have a golf ball launcher that I built, I wanted to add breech loading to it,
My barrel is sdr 21 1 1/2
Do i just cut a spot in my barrel for the ball to go in and just sleeve it with sch 80? Or what should I do
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Unread postAuthor: farmerboy32 » Sun Jul 17, 2011 7:24 am

try using the search tool, because there are many different ways you can do this. The sleeving you mentioned should work, but there are more "gun like" options you may want to try.
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Unread postAuthor: saefroch » Sun Jul 17, 2011 10:54 am

You've pretty much got it, but I suggest adding some method of at least partially sealing the breech.
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Unread postAuthor: jsefcik » Sun Jul 17, 2011 11:16 am

Saefroch, I was going to seal it by sleeving it over with the sch 80 pipe, is that what you mean?
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Unread postAuthor: Crna Legija » Mon Jul 18, 2011 3:09 am

jsefcik wrote:Saefroch, I was going to seal it by sleeving it over with the sch 80 pipe, is that what you mean?


the sch 80 pipe will not be air tight and you will loose lots of power if you don't seal it up with O-rings.
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Unread postAuthor: Lockednloaded » Mon Jul 18, 2011 3:11 am

Crna Legija wrote:
jsefcik wrote:Saefroch, I was going to seal it by sleeving it over with the sch 80 pipe, is that what you mean?


the sch 80 pipe will not be air tight and you will loose lots of power if you don't seal it up with O-rings.


SDR may be too thin to add o-rings. For a GB barrel you can afford an close to airtight breech because golf balls aren't very tight in the barrel
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Unread postAuthor: saefroch » Mon Jul 18, 2011 6:37 am

Maybe even a few layers of tape and some lubricant around the breech will help the sleeve seal better.
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Unread postAuthor: Gun Freak » Mon Jul 18, 2011 8:42 am

You can't fit the sch 80 around the tape. It is too tight. You are fine with just the pipe. That is what I use on my breech loader and it doesn't waste air. It won't harm performance.
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Unread postAuthor: dewey-1 » Mon Jul 18, 2011 12:05 pm

Here is a possible method!

http://sketchup.google.com/3dwarehouse/ ... revstart=0

If more details are required PM me.

Here is a simpler method that may work for you.
http://www.lowes.com/pd_20610-34146-P60 ... facetInfo=
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Unread postAuthor: tony48 » Mon Jul 18, 2011 5:53 pm

I've found that those compression couplings don't work so great since they are so tight and hard to move. Here's what I did for my breech loader-it's a 1.5" coupling that I turned the inside down so the pipe could slide through but it was still tight. I drilled the hole with the closest size forester bit I had but it was still about 1/8" too small so I had to use a sanding drum to make the hole bigger. So now it is large enough that the golf ball can pass through but it is tight and has to be pushed through the pipe. I wanted to make the hole as small as possible to maintain structural support of the pile. It ended up still being very strong, especially with the coupler slid over the hole. It took a lot of work but was worth it.

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Unread postAuthor: jsefcik » Mon Jul 18, 2011 7:20 pm

How air tight is your design tony48? I dont see any "O" rings
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Unread postAuthor: jsefcik » Mon Jul 18, 2011 7:30 pm

@ tony48What size is the barrel and coupling?,

Im guessing the barrel is sdr 1 1/2 and coupling i have no idea
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Unread postAuthor: warhead052 » Mon Jul 18, 2011 7:41 pm

@jsefcik Please use the edit button... And read the posts.
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Unread postAuthor: MrCrowley » Mon Jul 18, 2011 9:33 pm

jsefcik wrote:@ tony48What size is the barrel and coupling?

tony48 wrote:it's a 1.5" coupling


As warhead noted, don't double post. If you have something else to add please use the edit button as we don't allow members to post twice in a row in the same thread.
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Unread postAuthor: tony48 » Mon Jul 18, 2011 9:44 pm

My design is airtight enough for me to use. Im sure ita not perfect but there is definately no noticable or drastic power loss. Hope you all like my pinkish/purplish 1.5" sdr 21 also :lol: It was the only color available to me
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