I spent way too much time dealing with this issue with my Orion 2800 rotator.
I finally bought of these K7NV mast clamps and never had a problem since. He
makes these for his prop pitch rotators and others. Just tell him what you
have. Take a look at the design. No slipping there !
https://www.k7nv.com/proppitch/id35.htm
<https://www.k7nv.com/proppitch/id35.htm>
Bob
K6UJ
> On Jul 29, 2020, at 1:53 PM, Mac <libbysales@austin.rr.com> wrote:
>
> Ah ! i have done this and i will add with great success, AND my mast was
> 1/2" Chromoly 2" od and obviously then 1" id after drilling the hole i didn't
> use a bolt but rather a 1/2" spring pin or roll pin and have NEVER looked
> back, drifted that pin into place and it has held brutally with both a long
> 46' boom 6L Telrex and my 4L SteppIR .. on several occasion i have had
> reason to separate the mast from the rotor and using a straight punch pushing
> the roll pin on out was a no real brainer, then of course after the work was
> done just used the smooth end of the pin and drifted it back into place..
>
> Best: mac/mc w5mc
>
> On 7/28/2020 6:00 PM, Les Brown wrote:
>> I have 2 large Yagis attached to a 3 inch OD ¼ inch wall thickness Chromoly
>> mast running down the tower to a ProSisTel PST-71D. On a windy day, I hear
>> creaking sounds from the tower. The mast is slipping slightly in the rotator
>> mast bracket. I’ve already tried to tighten the 6 bolts, but it still slips.
>> I don’t want to tighten them to the point where they might snap. I’m
>> thinking that what I need to do is to go up the tower, drill a hole through
>> the mast (the rotator mast bracket already has holes), and pin the mast and
>> bracket. I understand that it’s not easy drilling through Chromoly pipe, so
>> before I try this, I thought I would ask if any of you have any other
>> suggestions.
>>
>> 73, Les VE3NNT
>>
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