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Metal to metal joining

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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Metal to metal joining

Unread postAuthor: flamerz14 » Tue Jun 05, 2007 8:52 am

I am building a aluminium/copper gun but my problem now is how I should join the female thread adapter to the barrell, attaching the bushing to the chamber, endcap to the chamber and is just putting teflon tape on threads able to hold pressure yet make the barrell detachable as well?[/list]
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Unread postAuthor: turbohacker » Tue Jun 05, 2007 8:56 am

Yeah teflon will hold the pressure, you will just need to replace it after every time you take it apart
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Unread postAuthor: flamerz14 » Tue Jun 05, 2007 9:00 am

what abouts of joining the female threads to the barrell and joining endcap to the chamber and joining the bushel to thechamber? sorry but i'm a real noob pipes..
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Unread postAuthor: spudthug » Tue Jun 05, 2007 9:31 am

wait a sec....is the red copper? if so u will need to learn how to solder them..
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: flamerz14 » Wed Jun 06, 2007 7:04 am

would using metal epoxy work? I saw a pack that says it can hold up to 1500psi once it has cured for 24 hrs. and btw, is just using pvc solvent cement safe for a pneumatic?The guy at the hardware shop says it doesn't need primer..plus it cheap.Only SGD$2.20 a small can.
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Unread postAuthor: pyromaniac » Wed Jun 06, 2007 8:15 am

flamerz14 wrote:would using metal epoxy work? I saw a pack that says it can hold up to 1500psi once it has cured for 24 hrs. and btw, is just using pvc solvent cement safe for a pneumatic?The guy at the hardware shop says it doesn't need primer..plus it cheap.Only SGD$2.20 a small can.


guys at hardware store are dumb asses never belive them. they will sell you dwv and they tell you only cement. You need primer. Or else your parts could blow off and injure someone.
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Unread postAuthor: flamerz14 » Wed Jun 06, 2007 8:50 am

PVC solvent= cement? an what about the etal epoxy? is it safe?
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Unread postAuthor: pyromaniac » Wed Jun 06, 2007 11:28 am

cement is also a solvent but you need primer and cement. primer is a much better solvent.
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Unread postAuthor: SpudBlaster15 » Wed Jun 06, 2007 2:50 pm

Flamerz14, for the last f'ing time, you DO need primer. Read THIS
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Unread postAuthor: flamerz14 » Wed Jun 06, 2007 9:17 pm

spudblaster15 sorry! i saw 2 cans of it one said solvent the other cement. not to mention the idiot guy at the store said no need to prime. and I know i need to, jjs to check with you all here.

Can't you guys pity a noob??
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