Paul and Bill:
Thanks for the feedback. I'd like to avoid having to take a drill up the tower
to solve the issue, but that may be where I end up.
I neglected to mention that I have 2 20 foot sections of 2 inch heavy wall
aluminum pipe for the job. If they were steel, no way could I manage the weight.
I am surprised that the TT does not have some kind of serrations or other rough
surface where the mast sits in the rotor to help things stay put.
Something to put in as a flat strip to furnish more grip on the pipe was what I
was hoping for.
Don
On Sunday, July 30, 2023 at 03:53:39 PM EDT, Paul N1BUG FN55mf
<paul@n1bug.com> wrote:
I had frequent problems with Ham IV and T2X rotator clamps slipping on
my VHF stack (two or more yagis with ~30 foot booms) and an HF/6m stack
with TH-11DX and 13 element 2m on a 26 foot boom. Note that I was using
aluminum masts at the time.
One day N1RR suggested I tighten the nuts and then add SS nylock nuts
tightened against the plain SS nuts. Neither slipped again. Of course
next time the gears got smashed on the HF/2m stack T2X, but that's
another story. I always use anti-seize compound on SS hardware which
does a lot to prevent galling but also makes it easier for hardware to
work loose.
My Ham IV with the described double nut arrangement has not slipped
since the 2021 antenna farm rescue and rebuild, turning a four yagi
stack, one each 6m through 432 with booms from 33' to 26'.
Paul N1BUG
On 7/30/23 15:38, Bill Olson wrote:
> Don I use a TailTwister here. It turns a 2" carbon steel mast with
> the appropriate 1/32" shims. I have a stack of moderate sized VHF
> Yagis, don't use the thru-bolt and have never had a problem with the
> mast slipping in the rotor.
>
> bill, k1DY ________________________________ From: VHFcontesting
> <vhfcontesting-bounces+callbill=hotmail.com@contesting.com> on behalf
> of Donald Fox via VHFcontesting <vhfcontesting@contesting.com> Sent:
> Sunday, July 30, 2023 5:24 PM To: vhfcontesting@contesting.com
> <vhfcontesting@contesting.com> Subject: [VHFcontesting] TT rotor
> question
>
> Along with the new towers here at the new QTH, I've upgraded from Ham
> 3 to Tailtwister rotors. You might recall that the smaller Ham/CDE
> rotors had a threaded hole and bolt in the center of the clamping
> plate to help keep the mast pipe from turning independently of the
> rotor.
>
> The TT has a hole for a 3/8s ish bolt to "pin" the the mast. I had
> not done that, thinking it would not be an issue with the larger
> clamp hardware. We have some pretty good winds here, and the MP does
> not want to stay put! I do crank on the SS clamps a fair amount, but
> am concerned about stretching/galling them. We all know what a mess
> that is, especially 40 feet in the air.
>
> Feedback from TT users and what you experienced are appreciated. Feel
> free to reply directly if you wish.
>
> TIA
>
> Don N8ECH _______________________________________________
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