Quote Originally Posted by walpurgis View Post
Not quite so. The bearing lubricant film provides some small amount of damping. The rocking moment of the splindle/platter assembly and any lateral vibration will receive damping (and centralising) from the bearing/spindle lubricating film on the vertical faces and even the seemingly solid downward contact at the bottom bearing thrust point, will still have a minute film of lube.
As lawyers would say "de minimus". The point at issue (posts 744-746) was the relative vibrations of the bearing itself compared to vibrations reaching the bearing from the stylus. If there was lube damping it would surely apply to both vibrations.