An apparatus for forming microscopic recesses on a circumferential surface
that defines a cylindrical bore in a workpiece, the apparatus including a
form roller, a form roller drive driving the form roller to rotate about
a rotation axis in an axially offset position in which the rotation axis
is offset from a central axis of the cylindrical bore, an axial drive
causing a relative axial movement of the workpiece and the form roller
drive along the central axis of the cylindrical bore, and a rotary drive
driving at least one of the workpiece and the form roller drive to rotate
about the central axis of the cylindrical bore while keeping an outer
peripheral surface of the form roller pressing against the
circumferential surface that defines a cylindrical bore.