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
Regardless of the wall thickness, I would think the low yield strength would
make many other options better for equivalent weight.
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. 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.
Jim VE7RF
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