On 5/6/2010 10:23 AM, Jim Thomson wrote:
> Date: Wed, 5 May 2010 14:36:09 -0700
> From: "knormoyle@surfnetusa.com"<knormoyle@surfnetusa.com>
> Subject: Re: [TowerTalk] Aluminum Tower Mast
>
>
>
>
> [Dennis] "From day one, we used an aluminum 2" OD THICK WALL ALUMINUM CONDUIT
> Mast."
>
> I was curious about aluminum conduit. A quick search says that modern
> aluminum conduit is 6063 temper T-1
> (our typical 6061 use is T6)
>
> Wikipedia says ( http://en.wikipedia.org/wiki/6063_aluminium_alloy )6063 T-1
> has a yield strength of only 9kpsi
>
And it's very soft with poor wear qualities.
> Regardless of the wall thickness, I would think the low yield strength would
> make many other options better for equivalent weight.
>
>
It's made to bend. Even steel conduit is soft. I can bend up to 1"steel
conduit using the old hand/foot bender although after 3/4" it gets to be
work. Water pipe is pretty much the same.
> also, conduit is specified as I.D. was this 1.5" I.D. -> 1.9" O.D. conduit?
> or 2" I.D. -> 2.375" O.D. ?
>
> ??
> -kevin
>
> ## I just noticed the fellow mentioned he used al CONDUIT. He didn't say
> what thickness. We used AL conduit
> at work in yrs gone by, then it's all now steel, NO AL anywhere. [ think was
> mandated by building codes /electrical codes]
> CONDUIT is SOFT material. It has to be, to bend the stuff. Conduit would be
> 100% useless for a mast application.
>
> T-1 /9 ksi is normal. I seriously doubt you could even run either 6061-T6
> or even 6063-T832 through any conduit bender,
> even the hydraulic conduit benders. It would snap off. Somebody mentioned
> 7075 al alloy. It's good stuff
> too.. but VERY expensive... but it does have a higher yield strength than
> 6061-T6.
Even T-6 is notably more expensive than T-1 due to the extra processing
of the alloy. I'm not at all familiar with 7075.
> 3003 is another flaky alloy...
> ranging from K-1 to K-14 for hardness. K-1 is only 6 ksi. You can get
> 50' rolls of AL tubing. F-12 uses it for their
> hair pin match's... it's like spaghetti.
>
You can purchase that at your local hardware store. Getting it straight
is something else.
73
Roger (K8RI)
> Jim VE7RF
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