[TowerTalk] Chromoly Mast slipping in a T2X rotor

[Kim Elmore]

I forgot to add: you are right in that a 3/32" shim is needed for a 1 
7/8" mast.

Kim N5OP

On 12/30/2018 9:41 AM, john at kk9a.com wrote:
> I never understood the popularity of 2" masts. Going smaller that 2" gives
> even less strength and less surface grip. I do not own a Hy-Gain rotator but
> the way I remember them is they have a metal plate the pushed the mast into
> the casting V. To center his mast he would need a 3/32 thick shim.  What
> material is the shim and does it cover the entire clamping area? Can the
> metal clamp plate bend and not allow sufficient tightening? Perhaps
> something like Tennadyne slip-nott http://www.tennadyne.com/slipp_nott.htm
> could be manufactured for his 1 7/8 mast. Perhaps there is a Stauff clamp
> that size. There is also the pinning option but that brings a lot of
> controversy - FWIW, I pinned my P40A Ø2 1/2 aluminum masts in to my Yaesu
> G-2800 DXA rotators per the manufacturer's instructions and never had an
> issue in that windy environment.
>
> 73,
> John KK9A
>
> Richard Smith n6kt wrote:
>
> A buddy of mine is using a T2X rotor with a 1 7/8" OD chromoly mast. He has
> about 13.5 sq ft of antenna surface area attached to the mast, which is well
> below the rating of 20 sq ft. The T2X is 10' below a thrust bearing.
> The mast has been slipping from time to time (windy conditions), and he was
> wondering if something can be done to stop the slippage. I have been using
> the K7NV clamp on my Orion 2800's that are clamped to 2" chromoly masts, but
> I don't see anything on Kurt's website for a T2X.
> Has anyone here on the Reflector had a similar experience and come up with a
> good solution?
> Thanks, 73, Rich, N6KT
>
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-- 

Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology, CCM, PP 
SEL/MEL/Glider, N5OP, 2nd Class Radiotelegraph, GROL)

/"In theory there is no difference between theory and practice. But, in 
practice, there is." //– Attributed to many people; it’s so true that it 
doesn’t matter who said it./