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A place to ask general spud cannon related questions.
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Unread postAuthor: subterranean » Tue Dec 27, 2011 2:06 am

i've used 1/4" brakeline with steel bbs and it was never accurate. i was hoping there is a place to buy brass pipe in a 4.5mm id. :?
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Unread postAuthor: wyz2285 » Tue Dec 27, 2011 6:51 am

well have you tried to buy a .144 barrel? I searched in ebay and didn´t found 4.5 ID tubes and personally I have never found one anywhere either...
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Unread postAuthor: Gippeto » Tue Dec 27, 2011 10:35 am

wyz2285 wrote:Hi I´m making a new pcp rifle, and I´m planing using a stainless steel tube as chamber, 0.75mm wall. Is it safe to use 1000 psi with it?


Not enough information.

What "kind" of stainless? ie 304, 316, 440, etc. You need to be able to determine the yield strength of the material...can't find that if you don't know what it is.

What's the outer diameter?

How are you going to secure the ends?
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Unread postAuthor: Lockednloaded » Tue Dec 27, 2011 4:14 pm

Would it be ok to tap a 1/8" thread through double layered 3/4" copper (type M tubing JFC'd into a 3/4" cap) if I plan to use up to 500 psi?
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Unread postAuthor: mark.f » Tue Dec 27, 2011 4:19 pm

Uh, JFC'd?

The total wall thickness of those two parts would be just about 1/16"... really not enough thread engagement IMO for a course 1/8" NPT thread.
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Unread postAuthor: Gun Freak » Tue Dec 27, 2011 4:28 pm

JFC= just for copper, a chemical bonding thing for copper. I wouldn't tap that small depth. That's only maybe 2 threads to engage.
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Unread postAuthor: Lockednloaded » Tue Dec 27, 2011 4:29 pm

JustForCopper glue, it supposed to hold like 600 psi. What if I reinforce it with some epoxy?
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Unread postAuthor: Gun Freak » Tue Dec 27, 2011 4:31 pm

Surely there's another option? I wouldn't trust the epoxy reinforcement either.
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Unread postAuthor: mark.f » Tue Dec 27, 2011 4:31 pm

I don't know if you can get to the inside, but I think it you threaded the fitting through and added a sliver of 1/8" coupling and some epoxy on the other side it would be alright.
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Unread postAuthor: Lockednloaded » Tue Dec 27, 2011 4:36 pm

I guess I could put it in the end of the cap so it'd be easier to reinforce
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Unread postAuthor: Gippeto » Tue Dec 27, 2011 5:14 pm

You can get reducer bushings that have thread in them....they're designed to sweat into copper fittings to attach such things as snifter (schrader) valves...look in the heating section where they have boiler system parts.
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Unread postAuthor: jackssmirkingrevenge » Wed Dec 28, 2011 12:44 am

subterranean wrote:i've used 1/4" brakeline with steel bbs and it was never accurate. i was hoping there is a place to buy brass pipe in a 4.5mm id. :?


The problem is that steel BBs are 4.4mm ID...
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Unread postAuthor: sl33k » Wed Dec 28, 2011 1:26 am

Hey, I was wondering if there is any useful tutorials on the application of liquid epoxy. I have used two part modeling epoxy before but never liquid epoxy and was wondering if there are any particular brands or types I should be leaning towards purchasing.

Any help is really appreciated :)
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Unread postAuthor: jackssmirkingrevenge » Wed Dec 28, 2011 2:22 am

sl33k wrote:Hey, I was wondering if there is any useful tutorials on the application of liquid epoxy.


look no further:

http://www.spudfiles.com/forums/epoxy-c ... t8916.html

http://www.spudfiles.com/forums/making- ... t8919.html
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Unread postAuthor: wyz2285 » Wed Dec 28, 2011 5:23 am

What "kind" of stainless? ie 304, 316, 440, etc. You need to be able to determine the yield strength of the material...can't find that if you don't know what it is.

I don´t know :? just normal stainless steel tubes used for water...
OD wound be 22mm
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