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Worn-out tooth surfaces: (a) POM gears at a torque level of 4 Nm after 2 × 106 cycles, (b) POM gears at a torque level of 5 Nm after 3.7 × 106 cycles, (c) PVDF gears at a torque level of 4 Nm after 4 × 106 cycles, and (d) PVDF gears at a torque level of 6 Nm after 2.5 × 106 cycles.
