There are lots of kinds of thrust bearings, including the ones on the front
wheels of cars, which are for a combination thrust/radial loads.
The pillow blocks with ball bearings are for minimal thrust loads and will wear
rapidly.
http://www.bearingson.com/Category/4-bolt_flanges/cast_iron_4-bolt_flanges/ucf_series/default.asp?page=2&SortType=0
Here are some true thrust bearings:
http://www.timken.com/en-Us/products/bearings/productlist/roller/thrust/Cylindrical/Pages/TP.aspx#
You can quickly recognize a ball thrust bearing, at least many of them, because
their outer circumference is split, so you see the balls when you look in
radially.
Think of two big washers, with balls between, like the ball race in your
rotator.
http://en.wikipedia.org/wiki/Thrust_bearing
I think the term “thrust bearing” is widely misused. Thrust is parallel to the
axis of the mast. A thrust bearing carries the weight of the mast and antenna.
Many top bearings are just for radial force, the side loads caused by wind,
unbalance.
WL
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