Claims
- 1. A method of individually balancing rotary actuators each for use in a respective rotatable head stack assembly (HSA) portion in a disk drive, each rotary actuator having a pivot axis, the rotatable HSA portion having an installed HSA portion center-of-gravity, the method comprising:a) for each rotary actuator individually determining a desired rotary actuator center-of-gravity location for locating the installed HSA portion center-of-gravity along the pivot axis for mitigating acceleration of the rotary actuator about the pivot axis due to external linear acceleration experienced by the disk drive during a track-follow operation; b) for each rotary actuator individually measuring weight distribution characteristics of the respective rotary actuator to determine an actual rotary actuator center-of-gravity; and c) for each rotary actuator individually selectively modifying weight distribution characteristics of the respective rotary actuator to locate the actual rotary actuator center-of-gravity at the desired rotary actuator center-of-gravity location.
- 2. The method of claim 1 wherein step c) of selectively modifying weight distribution characteristics of the rotary actuators includes adding balancing masses to respective ones of the rotary actuators.
- 3. The method of claim 2 wherein the adding of the balancing masses includes dispensing a material upon respective ones of the rotary actuators to respectively locate the actual rotary actuator center-of-gravity at the desired rotary actuator center-of-gravity location, the material has a first liquid phase when dispensed and has a second solid phase subsequent to being dispensed.
- 4. The method of claim 1 wherein step c) of selectively modifying weight distribution characteristics of the rotary actuators includes respectively removing masses from respective ones of the rotary actuators.
- 5. The method of claim 4 wherein the removing of the masses includes drilling respective ones of the rotary actuators.
CROSS-REFERENCE TO RELATED APPLICATIONS
The present patent application is related to U.S. patent application Ser. No. 09/608,250 filed on Jun. 30, 2000, entitled “DISK DRIVE INCLUDING BALANCE-COMPENSATED HEAD STACK ASSEMBLY PORTION HAVING INSTALLED HEAD STACK ASSEMBLY PORTION CENTER-OF-GRAVITY DISPOSED ALONG PIVOT AXIS,” the specification of which is hereby incorporated by reference. The present patent application is further related to U.S. patent application Ser. No. 09/584,837 filed on May 31, 2000, entitled “METHOD OF MAKING BALANCE-COMPENSATED ROTARY ACTUATOR BASED UPON TRACK-FOLLOW PERFORMANCE OF A ROTATABLE TEST HEAD STACK ASSEMBLY PORTION,” the specification of which is hereby incorporated by reference.
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