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Epoxy Putty PSI rating

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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Epoxy Putty PSI rating

Unread postAuthor: timmy999 » Fri Feb 17, 2012 10:13 am

I'm making a very simple air cannon. I have 3 old fire extingushers all different sizes. Deciding these would be great as air canisters and nice and simple. However they are all non standard metric size threads.

For instance the one i plan to use has a 30mm diameter opening.

Now i want to connect a 22mm fitting onto the canister. Is it possible to use epoxy putty? what sort of pressure could it withstand?
I only actually need it to be 150psi max.

Cheers

Tim
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Unread postAuthor: killerbanjo » Fri Feb 17, 2012 10:47 am

Although i think it would hold as long as the putty was sealed well and pressed firmly i think casting an epoxy block would be much better. Or make your own using some tubing with taps and dyes
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Unread postAuthor: jackssmirkingrevenge » Fri Feb 17, 2012 11:05 am

Something I made a while ago:

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Unread postAuthor: pneumaticcannons » Fri Feb 17, 2012 11:09 am

Agreed. A great casting how to :wink:

EDIT: oops, jack ninja'd me :D
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Last edited by pneumaticcannons on Fri Feb 17, 2012 10:50 pm, edited 1 time in total.
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Unread postAuthor: jackssmirkingrevenge » Fri Feb 17, 2012 11:27 am

pneumaticcannons wrote:EDIT: Crap, jack ninja'd me


Well, you were sort of posting my own how-to ;)
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Unread postAuthor: jsefcik » Fri Feb 17, 2012 12:25 pm

jb weld all the way!!!! :D :D :D
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Unread postAuthor: timmy999 » Fri Feb 17, 2012 12:33 pm

Thanks alot, Both tutorials are excellent. I'll probably do this method.

Another question though.

In one of my fire extingushers, allthough the threads don't quite marry a 3/4" fitting pushes quite snugly inside. Would it be easy to Braze/Weld it?

(I'm someone who's never brazed or welded)
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Unread postAuthor: jsefcik » Fri Feb 17, 2012 4:28 pm

timmy999 wrote:Thanks alot, Both tutorials are excellent. I'll probably do this method.

Another question though.

In one of my fire extingushers, allthough the threads don't quite marry a 3/4" fitting pushes quite snugly inside. Would it be easy to Braze/Weld it?

(I'm someone who's never brazed or welded)



brazing is extremely easy, you can do it with a bigger blow torch, or just use a oxy torch
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