...movable on said base (2), a tool spindle (17) mounted on the first slide (2) for clamping a finishing tool (4), a carrier (7) movably positioned on the machine base (1) which carrier (7) is movable into at least two positions, at least two workpiece spindles (6a, b) rotatably mounted on the carrier (7) and driven by one motor (33a, b) each, and at least one centering probe (9a,b) wherein a centering operation...