[TowerTalk] N6RK Winch

[Richard (Rick) Karlquist]

Thanks for the positive feedback.  Good to know someone
actually reads these articles I write.

Are you asking about the pulley shafts on the tilt fixture
as supplied by US tower, or are you asking about the bearings
on the winch itself?  The winch itself is actually rated at
6500 lbs.  On the UST pulleys, each has 8,000 lbs of shear,
but the sheeves are sandwiched between two plates so the
shaft is very short.  It is similar to the pulleys on the
tower itself.  No one has reported any shear failures of
UST pulleys.  (Bearings wear out, but that's another issue).

Rick N6RK

On 7/14/2015 9:24 AM, Wilson wrote:
> NICE JOB!!
> But I wonder about the 4000 lb tension number, with a four part lift?
> That would be 16,000 lb going somewhere??
> Looks great, but I’d sure look into the pulley shafts.
> If the 4000 is right, they are seeing a serious shear load!
> I’m not giving the answer, just the question.  Seems a weak link...
> Wilson
> W4BOH
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