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PostPosted: Mon Nov 20, 2017 9:59 am 
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Does anyone know exactly what alloy this would be?

This comprehensive list goes from 13-83 kpsi, I'm guessing the above would be a 6063 alloy on the lower end of the spectrum.


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PostPosted: Mon Nov 20, 2017 11:19 am 
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No way of knowing exactly what alloy, or the manufacturing method (welded, seamless, DOM, etc.).... A pretty safe bet is that it is NOT better than 6061-T6.... and as you say most likely a lower grade.... If you are thinking of using it for a pressure vessel, the only safe way would be to hydrotest a piece to destruction and then use about 1/4 of that for your MSWP (maximum safe working pressure)....

Bob

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PostPosted: Mon Nov 20, 2017 11:47 am 
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That would be my feeling. Are there any online retailers of stronger alloy tubes you would recommend?

This is for a 2240 HPA conversion I'm pondering, I guess fitting it snugly in the steel tube would make it safe but having something that would take the pressure independently would be preferable.


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PostPosted: Mon Nov 20, 2017 11:56 am 
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Making a gauge block?


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PostPosted: Mon Nov 20, 2017 12:03 pm 
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What's wrong with SS tube? Does it have to be aluminum?

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PostPosted: Mon Nov 20, 2017 12:11 pm 
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leadslinger wrote:
Making a gauge block?


Not sure what that refers to, not one of these I guess.

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What's wrong with SS tube? Does it have to be aluminum?


Stainless would also be fine, I'm just more familiar with aluminum and brass. It's the first time I'm properly venturing beyond 1000 psi so open to suggestions.


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PostPosted: Mon Nov 20, 2017 1:36 pm 
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Aircraft Spruce has a wide selection of Aluminum and CrMoly tubing....

http://www.aircraftspruce.ca/catalog/me ... e_2024.php

http://www.aircraftspruce.ca/catalog/me ... ng_un1.php

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Mon Nov 20, 2017 2:49 pm 
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Thanks for the link!


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PostPosted: Mon Nov 20, 2017 4:42 pm 
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Go for stainless or 4130, don't mess around. Flood cool it and don't let it overheat during machining either.

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PostPosted: Tue Nov 21, 2017 7:07 am 
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DerekVinyard wrote:
Go for stainless or 4130, don't mess around.


Fair enough.

Here's what I'm contemplating, big bore 2240 with a balanced valve:

Image


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PostPosted: Tue Nov 21, 2017 10:32 am 
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Just switch the front fill adapter to a Discovery adapter or custom one and just use a foster with check to seal it up. Save some time on machining...
Where are you from?

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PostPosted: Tue Nov 21, 2017 10:39 am 
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DerekVinyard wrote:
Just switch the front fill adapter to a Discovery adapter or custom one and just use a foster with check to seal it up. Save some time on machining...


Yeah, threading the existing cap for a 1/8" NPT foster would definitely be more practical.

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Where are you from?


Currently in Quebec.


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PostPosted: Tue Nov 21, 2017 11:36 am 
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Planning on a single shot per fill?.... Very small reservoir for a big bore...

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Tue Nov 21, 2017 11:55 am 
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Just looked at the drawing, missed that. Even in .177 your shots will be very limited, you need a tank. Even a long tube on a big pistol would not be much.

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PostPosted: Tue Nov 21, 2017 11:59 am 
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I calculated about 3 useful shots in the 450-350 fps range for a 3,000 psi fill.

I have a .357 barrel I want to put to good use, considering either the above with a short barrel and high pressure or something similar to what you had done here running in the 1,000 psi range with a regulated paintball bottle. That would make it a little unwieldy however scoped and fired from rest it should be pleasant to shoot.


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