Daniel Gagnon wrote:

The problem you can have with that kind of bearing is:

-if you don't have a constant pressure on the bearing
-if you utilise it in up/down position

THE RESULT will be CASTASTROPHIC sometime.

All the bearing with the plastic part can go down to the ball ways and the ball start to slipping instead of rolling and sometime the port will stay open because the ball have to roll half and half on the way.

I experience it on the surface grinder at our school.

See the drawing...

 
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