OK, I’m old.
I keep seeing the trem “thrust bearing” used for the bearing at the top of
towers, to take the side load of the mast.
AFAIK, thrust bearings take AXIAL loads, the load of the mast/antenna going
down the mast toward the rotor.
Car crankshafts have thrust bearings, ship propshafts have thrust bearings,
etc, so why should we be different?
Yes, thrust and radially loaded bearings can be built together, as in a car
engine, but that’s not what we have when a mast goes through a sleeve.
So am I behind the times? Do tower people speak their own language, or what??
The Ham IV has 96 ball bearing balls, but they don’t bother to rate it for
axial load.
This little TV rotor
http://96.9.26.247/schemi/ACC_rotator/NTC_ECG_rotator_spec.pdf , however, is
rated for 100lb axial load, so I think the most of us with a tribander and Ham
XX won’t have a thrust problem.
Wilson
W4BOH
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