"Larry Blanchard" wrote

Can the mechanism in an ROS fail in such a way as to eliminate the
randomness?

Most definitely. You would notice it, because the normally tame sander
turns into a grinding disk instead of a ROS.

There is a ball bearing that can tie up due to the fine dust, but a high
quality sander has a good enough seal that it is unlikely to seize. That
being said, I have seen it happen.
--
Jim in NC


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