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[TowerTalk] Re: Ham IV rotor installation

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Subject: [TowerTalk] Re: Ham IV rotor installation
From: (Tom Anderson)
Date: Mon, 17 Sep 2001 10:24:05 -0500

> Fellow TT members:
> First, the thoughts and prayers of my XYL Cheryl (WY5H) and I go out
> to the victims and families of Tuesday's incidents in Pennsylvania,
> New York City, and Washington, D.C.  I under stand from a message from
> the ARRL that a number of hams are among the missing.
> Second, I'm reinstalling my Ham IV in a TriEx WT51 crankup after a
> lightning strike which did quite a bit of inside damage to the rotor,
> but which Norm's Rotor Service did excellent work repairing.
> Basically a brand new rotor inside at less than half the price of
> new.  He even installed the brake delay circuit.
> A few questions:
> 1. Does anyone know if HyGain ever established any bolt torque specs
> for the mast clamp, especially the single bolt in the center that
> rests against the mast itself.  I asked Norm and he said just tighten
> them as much as possible mentioning I probably couldn't break it.
> I've snapped too many bolts to have faith in that idea.  I even asked
> about drilling a hole in the mast, but he warned that would weaken the
> mast (10 ft .125 wall 2  inch steel mast with the rotor about 2 feet
> below the thrust bearing).
> 2. Does anyone ever actually "shim" the mast since HyGain said the
> rotor is designed for a 2 1/16 mast and the 1/32 in. shims each side
> are necessary to center the 2 inch mast. No one I've talked to ever
> said
> they "shimmed" any rotor. If so what do you use for shim stock?
> 3.  Do you allow the weight of the mast and antennas (Mosley Classic
> 33 WARC with 40m kit & Hygain 2m/440 vertical) to rest directly on the
> rotor or do you lift it slightly and tighten the thrust bearing so the
> rotor is just responsible for turning the antenna and mast, not
> holding the downward weight of the mast and antenna?  Thrust bearing
> is heavy duty supplied by Tri Ex in 1993, WELL greased  1-2 times a
> year with marine bearing grease.  Rotor previously turned a Mosley TA
> 33 Jr. and a Cushcraft 2 meter all mode 15 element beam.
> Any help appreciated, since I'm not sure all the damage to the rotor
> was caused by lightning, Norn said some internal parts were "chewed
> up."
> Tom, WW5L
> Colleyville, Texas

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