The 6007 shield bearing is the bearing that holds the spindle gear. There are two other bearings. Top bearing is a 6006, and the lower is a spindle grade 7006, which is the important one. What makes the most differance is the lower. You may want to check the pre-load on the spindle bearings which is done via the two top spindle nuts. (underneath the top bearing that you removed) Loosen both, then tighten down ~10 ft/lbs, then back off 1/8th a turn, then tighten the top locker nut.
We have a similar sound in all the units. I am, however, pulling the main spindle bearing in the morning and going to flush and re-grease. I'll report the findings.
In theory, you can go up to 9k spindle speed with ceramic grade bearings in the spindle. (subject for another day)
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Last edited by SyilAmerica; 01-17-2007 at 01:22 AM.
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