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"Overkill" New 1.5'' Piston valve in progress! Vid

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: Mimikool » Tue Jul 26, 2011 6:05 am

I don't see very well, but seems that's braze with brass rods, you must have bi-gaz post weld, to up to 1200-1500°.

If it's only a hard braze, you can use propane blowtorch, but to braze steel and large diameters, oxy-acetaline or propane is imperative.

Google translate don't make the different between: brazing, soldering and welding.

But if i understand : weld: with brass
solder: with tin
braze: Cu-P(copper phosphorus), Ar(silver)...
?
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Last edited by Mimikool on Tue Jul 26, 2011 6:12 am, edited 1 time in total.
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Unread postAuthor: motorfixer1 » Tue Jul 26, 2011 6:07 am

Propane fuel alone is not hot enough to truly braze or silver solder. An Aycetelene "turbo torch" is the bare minium for this task. A Propane/Oxygen setup is also a usable heat source but harder to find. A good rule of thumb is the heat source should be able to melt the base metal you are working with. If you are planning to go much higher than 200 psi, you should have the joints welded and pressure tested.
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Unread postAuthor: al-xg » Tue Jul 26, 2011 6:22 am

Weld= "Soudure", The work piece material is melted and mixed with the filler material.

Brazing= "Brasage fort", only the filler material melts, this is basically gluing with metal.

Soldering is a type of brazing="Brasage tendre", often inaccurately called "soudure a l'etain" in French. It uses lower melting point filler materials than for brazing (<450 °C)

There are also additional intermediate states, but above are the basics.
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Unread postAuthor: Mimikool » Tue Jul 26, 2011 6:43 am

Here, technician made a "soudo-brasage" with brass or a brazing ?
(how to say "soudo-brasage"?)
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Unread postAuthor: al-xg » Tue Jul 26, 2011 7:26 am

"soudo-brasage"= braze weld
This is just a type of brazing using bronze or brass as a filler material, the workpiece metal does not melt.
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Unread postAuthor: jhalek90 » Tue Jul 26, 2011 4:02 pm

I just got a quote from my local welder, $30 to have a 2'' pipe nipple welded on. Not a bad deal.

Im goin to have it done on monday, So i shall start construction on the firing valve.

Should i build a metal piston valve? or a PVC one?
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jackssmirkingrevenge wrote:I wonder... if you put flammable vapours inside a lady... could you get her to diesel?

POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
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Unread postAuthor: Gun Freak » Tue Jul 26, 2011 4:07 pm

Metal!!!! :D
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Unread postAuthor: jhalek90 » Tue Jul 26, 2011 4:11 pm

Gun Freak wrote:Metal!!!! :D


Lol, i guess that settles it then. 1.5'' porting all metal piston valve cannon with a 1000 Cubic inch chamber.
:glasses5:
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jackssmirkingrevenge wrote:I wonder... if you put flammable vapours inside a lady... could you get her to diesel?

POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
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Unread postAuthor: Gun Freak » Tue Jul 26, 2011 4:26 pm

Like a Baws. 8)
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Unread postAuthor: warhead052 » Tue Jul 26, 2011 5:40 pm

I can't wait to see the 1.5" version.
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Unread postAuthor: motorfixer1 » Tue Jul 26, 2011 5:56 pm

This sounds SWEEET!! Metal all the way baby!
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Unread postAuthor: Fnord » Tue Jul 26, 2011 6:33 pm

HEY!
Take that original overkill tank and valve and hook it up to a vortex block/chamber. Fill it with 1/2" ball bearings.


:D :D :D
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Unread postAuthor: warhead052 » Tue Jul 26, 2011 6:47 pm

Fnord wrote:HEY!
Take that original overkill tank and valve and hook it up to a vortex block/chamber. Fill it with 1/2" ball bearings.


:D :D :D


Oh crap... I sense a new breed of bb machine guns.
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Unread postAuthor: Mr.Tallahassee » Tue Jul 26, 2011 9:02 pm

Anti-aircraft BB Machine Gun! :twisted:
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Unread postAuthor: jhalek90 » Wed Jul 27, 2011 1:36 am

Haha, in my typical style, a full auto vortex block bouncy ball gun?
That would be sick.

I think I'll stick with the 1.5" porting piston.
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jackssmirkingrevenge wrote:I wonder... if you put flammable vapours inside a lady... could you get her to diesel?

POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
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