A system, method and means is provided for withstanding mechanical shock for use with fluid dynamic bearings. The dialogues permit interactive communications between the user of the system and the user’s customers or other participants. The standby node stores the number in a counter and decrements the counter upon receiving data messages. Also, one planetary gear member is continuously connected to the transmission housing. The work is cut in the abrasive liquid so that a sufficient amount of the abrasive grains can be supplied between the work and the wire for a long time.