With the many industrial gearboxes available today, it’s important to match the proper kind of gearbox with the drive, motor, and load. Whenever a machine requires a servosystem (drive and engine), the gearbox type is crucial for accurate and repeatable motion. Planetary gearboxes suit you perfectly for servo applications.
High-precision helical planetary gearboxes are a great choice for applications that need accuracy and reliability. Planetary gearboxes have very low backlash ratings (typically ranging from one to nine arc-min), and 
when sized correctly provide a service lifestyle of over 20,000 hours with practically no maintenance. Helical planetary gears provide very noiseless and better operation as compared to competitive products.
Precision gearboxes are carefully machined to high tolerances – think clockmaker, not blacksmith. They provide power densities that translates to small package size and efficiencies of 90% and greater.
Servomotors often drive loads directly without the need for a gearbox, however in many applications it’s advantageous to make use of a gearbox between the motor and load.
One main reason to use a gearbox is torque multiplication. It lets designers make use of smaller servosystems that consumes much less energy. Rather than buying relatively huge servodrives and motors, developer can use smaller elements, saving space and cash.
Output torque improves in direct proportion to the apparatus ratio, and top rate of the result shaft decreases. If an application can withstand the reduced speed, a relatively small servosystem can supply high torque.
Gearboxes can also servo motor gear reducers address inertia mismatches. For high performance servosystems — those with high dynamic responses or low overshoot, for example – the ratio between your reflected load inertia and motor inertia should be only practical, preferably under ten-to-one. A precision gearbox reduces the reflected inertia by the square of the reduction ratio. For instance, using a 25:1 gearbox reduces the load’s reflected inertia by a factor of 625, a substantial improvement.