In power plant and oil and gas industries, power transmission is done through special gearboxes with high sensitivity and dimensional accuracy. In power plant industries, especially in GE turbines, sensitive consumers with different rotational speeds such as hydraulic pumps or fuel pumps supply their driving power from the auxiliary gearbox. In the oil and gas industries, the need for high rotation speeds for pumps, compressors and turbines is often possible by using special gearboxes. In such a situation, high dimensional accuracy, very high surface smoothness, multi-plane balance of axles and gears, as well as the need to grind the gears with grade 5 or 6 are among the requirements of gearbox production.