With the many industrial gearboxes on the market, it’s important to match the proper kind of gearbox with the drive, motor, and load. When a machine requires a servosystem (drive and electric motor), the gearbox type is critical 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 require 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 life of over 20,000 hours with virtually no maintenance. Helical planetary gears also provide very calm and better operation as compared to competitive products.
Precision gearboxes are carefully machined to high tolerances – believe clockmaker, not blacksmith. They offer power densities that means small package size and efficiencies of 90% and greater.
Servomotors often drive loads directly with no need for a gearbox, however in many applications it’s advantageous to use a gearbox between your motor and load.
One main cause to employ a gearbox is torque multiplication. It lets designers use smaller servosystems that consumes less energy. Rather than buying relatively large servodrives and motors, designer can use smaller elements, saving space and money.
Output torque boosts in direct proportion to the gear ratio, and top rate of the result shaft decreases. If an application can withstand the decreased speed, a relatively small servosystem 
can supply high torque.
Gearboxes may also address inertia mismatches. For powerful servosystems — people that have high dynamic responses or low overshoot, for instance – the ratio between the reflected load inertia and engine inertia should be as low as practical, preferably under ten-to-one. A precision gearbox decreases the reflected inertia by the sq . of the decrease ratio. For instance, using a 25:1 gearbox decreases the load’s reflected inertia by a factor of 625, a substantial improvement.