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EMS conduit Pipe?

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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EMS conduit Pipe?

Unread postAuthor: clemsonguy1125 » Sun Jun 27, 2010 11:38 am

While hanging out in lowes the other day I came across some EMS conduit pipe in the electrical section for dirt cheap($1.37 for a 1/2 in 5 foot piece) and was thinking about how it could be used in a spud gun, I was thinking a small coax. The main problem is there are no fittings for it. They have a few plastic compression fitting but those I know are not pressure rated and cant hold air without leaking. I could use epoxy like JSR did for his marble cannon but I want it to be servicable. Also what is the safe maximum pressure for it?
EDIT-Could I epoxy copper fittings on it, I only want to use it below 150 psi
Thanks Clemsonguy1125
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mini coax.png
Not needed but heres a paint sketch of the coax
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Last edited by clemsonguy1125 on Sun Jun 27, 2010 8:03 pm, edited 3 times in total.
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Unread postAuthor: woodscout » Sun Jun 27, 2010 1:03 pm

hmm i would take it to 150 mayby, and glue copper fittings with JB to make the piston serviceable
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Unread postAuthor: clemsonguy1125 » Sun Jun 27, 2010 1:10 pm

I was thinking that but I'm still not sure
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Unread postAuthor: woodscout » Sun Jun 27, 2010 2:32 pm

just try, then you now it :D :D
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Unread postAuthor: Technician1002 » Sun Jun 27, 2010 2:55 pm

The conduit is EMT (Electrical Metal Tubing) not aluminum. Test it with a magnet. It is galvanized. It does hold 150 PSI fine in the 1/2 inch size. :D Don't ask how I know. It was non SF safe testing that was done. Don't ask.

The advantage is the pipe is seamless so wire insulation does not get damaged by a seam. I'm looking into the rigid conduit for the 4 inch cannon. :D
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Unread postAuthor: clemsonguy1125 » Sun Jun 27, 2010 3:35 pm

I was about to correct that actually, I just got back from
lowes, thanks as always tech, I might make a hp pump out of it now since it's seamless
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Unread postAuthor: Technician1002 » Sun Jun 27, 2010 4:21 pm

Try to keep it under 350 PSI. It is not thick wall. :D
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Unread postAuthor: clemsonguy1125 » Sun Jun 27, 2010 5:03 pm

I just need a way to connect it, will epoxying copper fittings work
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Unread postAuthor: Gun Freak » Sun Jun 27, 2010 5:09 pm

Epxying should work fine but I would jb weld it.
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Unread postAuthor: clemsonguy1125 » Sun Jun 27, 2010 5:15 pm

Ill do that then
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Unread postAuthor: Crna Legija » Sun Jun 27, 2010 6:43 pm

I used to test if my piston gun would go full auto with a pop off, it didn't :(. But held up it 300psi fine.

make sure you rought up the pipes before you even epoxy it, a broken drill bit does a good job.
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Unread postAuthor: Technician1002 » Sun Jun 27, 2010 7:02 pm

I like to move the barrel support forward. Air betwwen the support and breech has no flow restrictions as air does not have to go past them. Air forward them moves slower past them for less loss.

This worked well on my Mouse Musket and Dragon cannons.

My Dragon could hardly be considered a mini.

I've not tested it, but it may be possible to solder the tubing.
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Supports move away from the breech
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Unread postAuthor: Crna Legija » Sun Jun 27, 2010 7:12 pm

if you keep is under 30cm i wouldn't even put a suppot, use a removable one that you take out after the epxoy cure
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Unread postAuthor: clemsonguy1125 » Sun Jun 27, 2010 7:37 pm

Ok, ill see if when I start this, I have to finish my new bbmg first, also will a dremal with a metal cutoff wheel be able to cut this
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Unread postAuthor: Technician1002 » Sun Jun 27, 2010 11:40 pm

To get a nice clean cut that is square, use a tubing cutter, the one with the wheel. Many are designed to cut copper, aluminum and thinwall EMT.
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