Patent ID: 8040638

Claim:
A rotary actuator assembly for a disk drive, the rotary actuator assembly including a primary spacer and a secondary spacer, each having a top surface separated from a bottom surface comprising: a datum hole having a pivot axis, the datum hole for receiving a pivot bearing assembly; the primary spacer having a plurality of locator pins disposed on the top surface coaxially aligned with locator pins on the bottom surface, the locator pins receive head suspension assemblies and the secondary spacer; and a first head suspension assembly, also having a datum hole, is demountably inverted, head side up, and urged onto the underside of the primary spacer, the first head suspension assembly further comprising: an ellipsoidal shaped hole and two polygonal shaped holes for engagement with the shorter locating pins disposed on the underside of the primary spacer, said holes shaped for controlling azimuthal alignment; a second head suspension assembly, also having a datum hole, is demountably urged, head side down, onto upper locator pins of the primary spacer; the first and second head suspension assemblies are interleaved between the primary spacer and the secondary spacer; and a coil assembly area disposed on the top surface of the primary spacer using conventional means for attachment of the coil.