Here we go again. Someone made a remark about thrust bearings, now the
techie wonks are going to beat this thing to death.
Knew a fellow when I was growing up, never had much formal education,
but had a lot of common sense. Owned a blacksmith shop. He could look or
listen to what was needed and fix you up. Never saw anything he ever did
rip, rattle, tear or bag at the knees (the old Levis guarantee).
Thomas Edison once said things are 10 percent inspiration and 90
percent perspiration. Can't wait for the comebacks to these remarks.
73
Dave, KC7DM
Las Vegas
> > > First case: The weight of the mast supported by the thrust bearing,
> > >
> > > Second case: Weight of the mast supported entirely by the rotator, Assume
> > > the mast has minimal (few thousandths) of play where it goes through
> > > the
> > > top of the tower.
> > >
> > The mast is the lever arm and the pivot point is where it contacts the
> > top of the tower. The mast and antenna load is trying to pry the bottom of
> > the
> > mast that's attaced to the rotator in the opposite direction with LOTS of
> > side
> > force.
>
> PEs out there, correct me if I'm wrong...
> It seems to me the vertical load on the rotor, as in case 1 and 2
> above, has no effect on the side load forces (cosine of 90 = 0),
> assuming the thrust bearing is the pivot point of the system.
> 73 Barry
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