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Custom end caps for ally 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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Unread postAuthor: Moonbogg » Sat Nov 20, 2010 1:15 am

I wouldn't be comfortable using epoxy for a cannon. That may just be me though.
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Unread postAuthor: jackssmirkingrevenge » Sat Nov 20, 2010 1:24 am

Moonbogg wrote:I wouldn't be comfortable using epoxy for a cannon. That may just be me though.


I was almost hurt by that remark :cry: why would you not feel comfortable?

If the material is used correctly, there's no reason to doubt its strength. It's all down to using it correctly though, my hybrid experimentation is a clear illustration:


Fail at 8x

Win at 17x
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Unread postAuthor: Moonbogg » Sat Nov 20, 2010 3:07 am

jackssmirkingrevenge wrote:
Moonbogg wrote:I wouldn't be comfortable using epoxy for a cannon. That may just be me though.


I was almost hurt by that remark :cry: why would you not feel comfortable?

If the material is used correctly, there's no reason to doubt its strength. It's all down to using it correctly though, my hybrid experimentation is a clear illustration:


Fail at 8x

Win at 17x


It makes me uncomfortable because in my mind I still see epoxy as "glue" and I consider pressure launchers to be devices that demand strong joints (unless duct tape is used. Duct tape is always acceptable) :wink:
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Unread postAuthor: chinnerz » Mon Nov 22, 2010 12:19 am

Ok, i went down there today and they have fiber-glass resin.. which i assumed isnt the right stuff.

But there is also this

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and this:

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will any of these do?
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 22, 2010 12:58 am

The "casting and embedding resin" might do but it's less likely to be strong enough for high pressure applications as it seems to be designed for aesthetic purposes, in a TLAR sort of world it will probably do but it would not be my first choice.

As to the Newtech stuff, the shop label describes it as "putty" so not much good for casting if that's the case.

I would go with the fibreglass resin.
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Unread postAuthor: Selador » Mon Nov 22, 2010 1:38 am

jackssmirkingrevenge wrote:As to the Newtech stuff, the shop label describes it as "putty" so not much good for casting if that's the case.


It looks to me like it is epoxy putty. In a can. With separate hardner.
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 22, 2010 1:59 am

I personally have never used epoxy putty, I imagine for a simple endcap it could suffice but I prefer the idea of pouring liquid because you can be sure it fills every nook and cranny and as such is more likely to seal well and adhere properly. It also means that if your mould has even a small pinhole leak in it, you're screwed, but it's something one learns to live with :roll:
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Unread postAuthor: chinnerz » Mon Nov 22, 2010 3:08 am

Define "high pressure applications" because i'll be lucky if i can produce 200psi.

I'm only asking because clear would be a bonus as i could use it for other things. :)
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 22, 2010 3:24 am

chinnerz wrote:Define "high pressure applications" because i'll be lucky if i can produce 200psi.


I would say a thick enough plug would suffice for sub 10 bar applications.

I'm only asking because clear would be a bonus as i could use it for other things. :)


I've used marine epoxy for aesthetic purposes too ;)

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Unread postAuthor: chinnerz » Mon Nov 22, 2010 8:03 pm

wow, that looks amazing :)
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 22, 2010 11:11 pm

chinnerz wrote:wow, that looks amazing :)


Shame she wasn't :roll: stick to using it for spudguns ;)
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Unread postAuthor: Selador » Tue Nov 23, 2010 1:33 am

jackssmirkingrevenge wrote:I personally have never used epoxy putty, I imagine for a simple endcap it could suffice but I prefer the idea of pouring liquid because you can be sure it fills every nook and cranny and as such is more likely to seal well and adhere properly. It also means that if your mould has even a small pinhole leak in it, you're screwed, but it's something one learns to live with :roll:


Waitaminnit, I gotta go check something....


Ok, back.

Whew, I thought the world was collapsing or something. I had to go and make sure my dogs and cats weren't sleeping together, and the sky was still propped up.

You came awful close to dissing some epoxy, there, bro.

;o)
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Unread postAuthor: Gippeto » Tue Nov 23, 2010 1:44 am

Our buddy TLAR dissing binary adhesives?

Not gonna happen...your world is safe...well...as far as that goes anyway. :wink:
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Unread postAuthor: jackssmirkingrevenge » Tue Nov 23, 2010 2:08 am

I've been promoting the use of binary adhesives in spudguns for as long as I can remember, because the benefits it has in terms of fleshing out ideas that could not be put together with standard parts for minimal cost. I see lots of good ideas on this forum that are never made because of the lack of material facilities, and that's a damn shame.

The reason it hasn't really caught on is because there are disadvantages to epoxy construction, curing time is one of the factors but when it comes to casting, it's imperative that the mould is spot on, because the slightest leak can result in tragedy forever preserved in the proverbial resin sarcophagus, which can be very disheartening.

I've had my frustrations with the above and decided I can live with it, most people don't seem to be of the same frame of mind.
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