This problem strikes me as needing more thought before climbing the tower.
I am imagining a clamshell fixture, the upper half of which clamps
around the mast with setscrew type bolts (a la alfaspid), and the lower
half which clamps or otherwise attaches to the rotor top.
I think pinning the mast should be the last resort for a large number of
reasons.
--
73,
-de John NI0K
https://www.qrz.com/db/NI0K
Kim Elmore wrote on 7/28/2020 7:50 PM:
This will be challenging. You need very hard bits (real cobalt bits, not just the gold
colored ones), plenty of cutting oil, patience (because you’ll have to go slow), and
lots of stamina (because as you go slow you’ll have to apply lots of pressure).
Kim N5OP
"People that make music together cannot be enemies, at least as long as the music
lasts." -- Paul Hindemith
On Jul 28, 2020, at 6:06 PM, Les Brown <lesbrown@sympatico.ca> 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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