With the many industrial gearboxes on the market, it’s vital that you match the proper type of gearbox with the drive, motor, and load. When a machine needs a servosystem (drive and electric motor), the gearbox type is crucial for accurate and repeatable motion. Planetary gearboxes fit the bill for 
servo applications.
High-precision helical planetary gearboxes are a great choice for applications that need precision and reliability. Planetary gearboxes possess very low backlash ratings (typically ranging from one to nine arc-min), and when sized correctly provide a service existence of over 20,000 hours with practically no maintenance. Helical planetary gears provide very noiseless and more efficient operation in comparison with competitive products.
Precision gearboxes are carefully machined to high tolerances – think clockmaker, not blacksmith. They offer power densities that means small bundle size and efficiencies of 90% and greater.
Servomotors often drive loads directly without the need for a gearbox, but 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 use smaller servosystems that consumes much less energy. Rather than buying relatively large servodrives and motors, designer can use smaller parts, saving space and money.
Output torque increases in direct proportion to the apparatus ratio, and top acceleration of the result shaft decreases. If an application can withstand the reduced speed, a relatively little servosystem can supply high torque.
Gearboxes may also address inertia mismatches. For powerful servosystems — those with high dynamic responses or low overshoot, for example – the ratio between the reflected load inertia and motor inertia should be only practical, preferably under ten-to-one. A precision gearbox decreases the reflected inertia by the sq . of the reduction ratio. For instance, utilizing a 25:1 gearbox reduces the load’s reflected inertia by a factor of 625, a significant improvement.