Kind of a duplicate but I've been away for a long time, and so I'm realizing there is more to this forum than I saw prior. My questions are pretty basic... I am curious how these bearings hold up against wood dust, if they are readily sourced, and replaceable.

I paid $750 for a 6040 frame with a 65 MM spindle mount, and $150 DHL to Hawaii
Sourced it from a larger firm, and hope it's decent... Any advice for somebody who's got a couple Microcarve machines? I am fearful of dust, but think otherwise it should be simple enough.