Derg
bearings: i am learning from this thread rather than trying to teach anyone
even if having some experience from high precision machine tools spindles which needed the speeds and accuracies of similar range. Only the forces were somewhat different
Accuracies: when reading the documents suggested by earlier posters (especially
http://http://mdrl.mne.psu.edu/papers/bearinganalyzer.pdf ) i have learned how much the bearing testing and machining has advanced - look at data presented there
.