Disk drive head actuator fabrication system employing standardized self-aligning modular components

A rotary actuator assembly for a disk drive, the disk drive having a base and a pivot bearing module fixed to the base, the rotary actuator assembly comprising:

• a support arm module;
• a motor coil module;
• an actuator core module comprising:
• a body portion including:
• a bore hole having a pivot axis, the bore hole for receiving the pivot bearing module;
• a coil assembly support region;
• a plurality of lower arm staking means;
• and
• a plurality of upper arm staking means positioned above the lower arm staking means, each of the upper arm staking means being circumferentially offset relative to each corresponding lower arm staking means, the circumferential offset being relative to the pivot axis such that either arm staking means is used for connecting the actuator core module to the support arm module and the circumferential offset allows stacking of another actuator core module into the rotary actuator assembly;
• a fixed support arm coupled to the body portion;
• and
• the motor coil module and the coil assembly support region defining staking means for connecting the motor coil module to the coil assembly support region.