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SpudFiles Forum Index » Pneumatic Cannon Discussion » Aluminium Tube Pressure Rated?
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Mitchza89
PostPosted: 05/06/2008 20:35 PM    Post subject: Reply with quote

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If you don't have the gear or the money to get a aluminium welding kit, finding fittings for aluminium tube is quite hard. Luckerly that the nominal bore tube is very similar in size to copper so your able to use copper fittings. Only drawback is you'd have to epoxy. It's the only way I can think of of bonding a metal to an alloy Confused
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Maniac
PostPosted: 05/06/2008 21:09 PM    Post subject: Reply with quote

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I think i might use aluminum tube on my next cannon the light weight a godd pressure factor is what i like from looking at. Mc master also has reasonable prices on it. They also sell it with thread so no welding!!!
Thanks for the idea Mitch
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Mitchza89
PostPosted: 05/06/2008 21:22 PM    Post subject: Reply with quote

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With a thread?? You're kidding? Shocked That would be THE best alternative to threaded galvanised steel!
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dongfang
PostPosted: 05/08/2008 7:23 AM    Post subject: Reply with quote

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Hi

Yeah, I also just checked a flimsy little 16 mm OD pipe with 1 mm wall thickness using Barlow's formula (using -400 MPa tensile strength).

With a safety factor of 2, it takes 250 bar without problems.. I will never get more than 70-80 bar in it..

Regards
Soren
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Mitchza89
PostPosted: 05/08/2008 7:33 AM    Post subject: Reply with quote

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Shocked ...

Why are more people not using this? It's such a good alternative to copper.
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dongfang
PostPosted: 05/09/2008 4:10 AM    Post subject: Reply with quote

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Hi,

I'm going to try braze some aluminium tonight!!! I didn't know until this week it was possible at all Embarassed Now I found the blowtorch, the welding (solder) rod and the stainless steel brush.

That's going to be a little exciting.

Regards
Soren
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Mitchza89
PostPosted: 05/09/2008 6:10 AM    Post subject: Reply with quote

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Best of luck mate! You'll have to post some pics as soon as you finish it! Very Happy
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Pyro Ninja
PostPosted: 05/09/2008 6:47 AM    Post subject: Reply with quote

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I think when I finish my numerous guns that need finishing, I may try a aluminum gun, always use it as barrels.
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Mitchza89
PostPosted: 05/09/2008 7:15 AM    Post subject: Reply with quote

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This is looking to be the new fad Very Happy. I remember when small bore guns came around when I was posting like mad about new designs and plans. Looks like a cirtain allow is the next big thing Very Happy.
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ilovetoblowthingsup
PostPosted: 05/09/2008 7:23 AM    Post subject: Reply with quote

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yea it seems that they are catching on indeed (as i'm working on plans for a t-shirt launcher for my school)

haha
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Mitchza89
PostPosted: 05/09/2008 7:28 AM    Post subject: Reply with quote

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Haha you blokes are as bad as me... I'm always thinking about something gun related in some way or another... Very Happy
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ilovetoblowthingsup
PostPosted: 05/09/2008 7:29 AM    Post subject: Reply with quote

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and im at school right now...haha... guns=life. school=nuisance.
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Mitchza89
PostPosted: 05/09/2008 7:48 AM    Post subject: Reply with quote

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Hahaha poor you. It's 11pm on a wonderful friday night in Aus....and I am as full as a 44 gallon drum....I reckon I could still fit in a few more beers though Very Happy.
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Brian the brain
PostPosted: 05/10/2008 12:10 PM    Post subject: Reply with quote

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I've just put 500 psi on an aluminium tibe just like that.I threaded it and put fittings on it.
It was 20 mm however.

That would mean yours will be safe to use at 300 psi, most likely all you need.
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Mitchza89
PostPosted: 05/10/2008 21:00 PM    Post subject: Reply with quote

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How did you thread it BTB? on the outside or inside? and what sorta fittings did ya use? Confused
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