① A sudden rise of temperature occurs when the rotation speed increases rapidly after
attaching the bearing integration, it is a factor of bearing damage.
② It is necessary to operate running-in by increasing the rotation speed gradually to fully
stir the newly sealed lubrication grease.
③ For the running-in pattern, it is not good to shorten its operation time as it is
determined according to the bearing temperature rising pattern.
④ Once the running-in of spindle has been performed, it is unnecessary to perform
running-in even if the machine was not used for two months.