With the many commercial gearboxes on the market, it’s vital that you match the proper type 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 fit the bill for servo applications.
High-precision helical planetary gearboxes are a great choice for applications that require accuracy and reliability. Planetary gearboxes possess very low backlash ratings (typically ranging from one to nine arc-min), so when sized correctly provide a service life of over 20,000 hours with practically no maintenance. Helical planetary gears provide very tranquil 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 with no need for a gearbox, but in many applications it’s beneficial to make use of a gearbox between the motor and load.
One main cause to employ 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 elements, saving space and money.
Output torque raises in direct proportion to the apparatus ratio, and top velocity of the output shaft decreases. If a credit card applicatoin can withstand the decreased speed, a relatively little servosystem can supply high torque.
Gearboxes may also address inertia mismatches. For high performance servosystems — those with high dynamic responses or low overshoot, for instance – the ratio between the reflected load inertia and servo motor gear reducers electric motor inertia should be only practical, ideally under ten-to-one. A precision gearbox decreases the reflected inertia by the square of the reduction ratio. For instance, using a 25:1 gearbox decreases the load’s reflected inertia by a factor of 625, a significant improvement.