Since you can't find the manufacturer's data, I suggest you do some web
browsing and find rigger's supply outfits....on those sites you'll be able
to find the working load, breaking strength, etc., of various types of wire
rope. I think you are in the right ballpark with 5/16" 7x19 for most 3-4
section 70' amateur service towers, but some research is in order. If you
can get the weight & dimensions of the tower sections, you might compare it
to similar commercial towers whose data is more readily available. If you
are in a salty environment, then you'll want to pay as much attention to the
longevity of the wire rope as you do of its physical characteristics.
Initial and periodic applications of Pre-Lube will also go a long to
extending the cable's life.
GL es 73
dan
k0dan
-----Original Message-----
From: Dan Levin
Sent: December 01, 2011 04:00 PM
To: towertalk@contesting.com
Subject: [TowerTalk] Which type of cable for a crank-up tower?
Of course, if I knew who made it I would just get the manual and do what
they say. But I don't know who made it, so...
I have an unidentified 65' crank-up tower, believed to be of English origin.
It needs to be recabled. The existing (original) cable appears to be 5/16",
but it might be 8mm or even 7mm (I am not where the tower is, so I can't
measure it exactly). Definitely bigger than 1/4". The tower lives in a
very salty, island climate.
I am trying to figure out what type of cable to use - not which size, but
which material and construction.
The easiest thing to find that seems appropriate is 5/16" 7x19 galvanized
steel.
But, I have read that these towers usually use 6x19 LC (linen core) - which
I can find in plain steel, but not in galvanized.
1) Is galvanized the way to go in this situation?
2) Any sense of which construction is most appropriate? I assume 7x19 would
be best if I can't find the 6x19 LC.
3) Anyone have a source of 6x19 LC galvanized 5/16" cable?
***dan, K6IF
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