For an ordinary bearing, all the balls are moved together on one side,
and they fit in that way - then the balls are spread out by the cage,
which is riveted or welded from two bits of metal, one on each side.
For angular contact bearings, it sometimes varies - they sometimes use
liquid nitrogen and heat, and sometimes for full complement bearings
there is a slot in, usually, the inner race through which the balls are
But even for these unusual bearings, again, mostly the balls are fitted
in place while touching each other, and then kept seperated by the cage.
-- Peter Fairbrother
That was seen on the TV show, but to be honest, some bearings don't look to
have enough room between the balls to do that. I guess the easy way to prove
to workmates is to remove a cage and try to take it apart.
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