[TowerTalk] FW: Why galvanized crank up cables instead of stainless?

[KM5VI]

At least one manufacturer does offer an option for stainless steel lifting
cables.  The option does require some pulley upsizing because size-for-size,
stainless steel cable alloys have lower load ratings than for their
galvanized counterparts.

Some popular SS cable alloys are 302,304,305, & 316 and I recall the load
ratings are typically about 80% to 90% of bright galvanized grade...  best
to refer to the manufacturer's published rating tables & use the appropriate
factors of safety.

Hope this helps.

Matt
KM5VI





-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
Richard (Rick) Karlquist
Sent: Monday, October 08, 2012 9:27 PM
To: TowerTalk at contesting.com
Subject: [TowerTalk] Why galvanized crank up cables instead of stainless?

Having just replaced my crank up cables (in case they might
be rusted internally), I am wondering why stainless steel
cables aren't used.  It would seem that they would avoid
the latent rust issue.  I realize that they are not as strong,
but they could simply be sized appropriately.  Is it the
case that they may still rust, just more slowly?  Would
they somehow wear out and break internally?  It would be
great to merely have to inspect the cables for obvious broken
strands and never have to replace them on a preventative basis.
Can someone explain this?  Don't airplanes use SS cables?

Rick N6RK
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