[TowerTalk] Mast slippage

[Robert Harmon]

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 at 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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