[Towertalk] New Rotator In Place; Mast Now Binds

[Steve Katz]

Hi Tom,

I didn't look, but presume you're right, as I've heard of people using large
masts with R25 "pointy top" sections.  I just never saw one myself that
would let a 2.00" OD mast rotate -- the ones I've used must have been
exactly that dimension, so a 2" mast was an interference fit. -WB2WIK/6

"If everything seems under control, you're just not going fast enough." -
Mario Andretti

> -----Original Message-----
> From:	n4kg@juno.com [SMTP:n4kg@juno.com]
> Sent:	Wednesday, December 04, 2002 7:58 AM
> To:	TOWERTALK@contesting.com
> Subject:	Re: [Towertalk] New Rotator In Place; Mast Now Binds
> 
> Actually, Rohn manufactures 5 different types of "pointy top" sections
> plus the "flat top" section.  See the Rohn catalog for details, including
> the PIPE Diameter at the Top which range from 2.0 to 2.75 inches O.D.
> 
> Tom  N4KG
> 
> On Tue, 3 Dec 2002 10:12:51 -0800 Steve Katz <stevek@jmr.com> writes:
> > I'd replace the pointy-top section with a flat-top one and use a 2" 
> > thrust
> > bearing.  And also a 2" mast.  Since you're in for thunderstorms and 
> > high
> > winds, work done in such conditions will be perfect, and will last 
> > forever!
> > 
> > But it does sound like you need to shim the mast-to-rotor interface 
> > to
> > center up the rotating mast better.  That's normal.  The HAM series 
> > rotors
> > only center the mast when the mast used is 2-1/6" diamenter, I 
> > believe, and
> > anything smaller O.D. will rotate out of centricity, causing 
> > precisely the
> > problem you have.  The last pointy-top R25 section I owned (many 
> > years ago)
> > would not even pass a 2" mast, let alone allow one to rotate.
> > 
> > WB2WIK/6
> 
> 
> 
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