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how heavy is too heavy? Edit New problem

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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Unread postAuthor: tghhs » Tue Nov 03, 2009 3:35 am

You *should* be ok just with the pvc Cement and no primer as long as you make sure the surface doesn't have the very thin oil coating on it, from the factory it was made. Sanding the area you plan to glue will do this (on both sides).

If you do this you wont have very long before it's cured enough that you wont be able to move it, like 5's in my experience, so make sure you've made a line on the pipe to where you wont the bushing to end.
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Unread postAuthor: c11man » Tue Nov 03, 2009 4:51 pm

there is absolutly no need to sand the fittings

mock up the barrel and mark were you need the glue to be for correct position. then prime both sides heavialy, slide barrel into fitting just enough that the area needing glue that you marked eairler is just outside the fitting, apply liberal amounts of glue to the pipe (remember if you have extra you can just wipe it off, too little and you will get a week joint) then while twisting slide the barrel into correct position. thats all you need to do to get a strong joint
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Unread postAuthor: tghhs » Tue Nov 03, 2009 11:05 pm

c11man wrote:
mock up the barrel and mark were you need the glue to be for correct position. then prime both sides heavialy, slide barrel into fitting just enough that the area needing glue that you marked eairler is just outside the fitting, apply liberal amounts of glue to the pipe (remember if you have extra you can just wipe it off, too little and you will get a week joint) then while twisting slide the barrel into correct position. thats all you need to do to get a strong joint


The problem with this that he'll get primer on his barrel, and most likely the sealing face.
which may give you a headache with the seal IMO
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Unread postAuthor: Technician1002 » Tue Nov 03, 2009 11:48 pm

tghhs wrote:
c11man wrote:
mock up the barrel and mark were you need the glue to be for correct position. then prime both sides heavialy, slide barrel into fitting just enough that the area needing glue that you marked eairler is just outside the fitting, apply liberal amounts of glue to the pipe (remember if you have extra you can just wipe it off, too little and you will get a week joint) then while twisting slide the barrel into correct position. thats all you need to do to get a strong joint


The problem with this that he'll get primer on his barrel, and most likely the sealing face.
which may give you a headache with the seal IMO


The trick to that is to insert the barrel from the breech and extend it out just far enough to prime and glue the barrel and then shove it back in. This avoids any damage to the valve seat. It's how I did the Mouse Musket and the Dragon. With the coupler and O ring on the valve seat there was no way to install it any other direction. There is no reason the barrel can't be installed through the chamber, pushed out another 2 inches for gluing and then pushed into place. If you do this, you can run primer into the coupling so the coupling and barrel get primer.

You are welcome. I've done this. It works.
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Unread postAuthor: tghhs » Tue Nov 03, 2009 11:56 pm

sounds good :D
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Unread postAuthor: Jeeperforlife » Wed Nov 04, 2009 12:34 am

Alright. I will buy the pipe at work tomorrow and git it fixed soon.
Thanks,
Marcus
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Unread postAuthor: Technician1002 » Wed Nov 04, 2009 1:01 am

On a quick note, work quickly. The primer softens the surface of the PVC and it swells slightly. This can cause binding if you let it soak in the coupler too long. Prime, glue and slide together with the 1/4 turn twist. Don't delay after the primer is on.
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