Smoothness and lack of ripple are essential for the printing of elaborate color pictures on reusable plastic cups offered by fast-food chains. The color image is made up of an incredible number of tiny ink dots of many colours and shades. The entire glass is printed in a single pass (unlike regular color separation where each color can be published separately). The gearheads must operate easily enough to synchronize ink blankets, printing plates, and cup 
rollers without presenting any ripple or inaccuracies that may smudge the picture. In cases like this, the hybrid gearhead decreases motor shaft runout error, which reduces roughness.
Sometimes a motor’s capability may be limited to the main point where it requires gearing. As servo producers develop better motors that can muscle applications through more complicated moves and produce higher torques and speeds, these motors need gearheads add up to the task.
Interestingly, no more than a third of the movement control systems in service use gearing at all. There are, of program, good reasons to do so. Using a gearhead with a servo motor or using a gearmotor can enable the use of a smaller motor, therefore reducing the machine size and cost. There are three main advantages of going with gears, each which can enable the use of smaller sized motors and drives and for that reason lower total system price:
Torque multiplication. The gears and amount of teeth on each gear make a ratio. If a electric motor can generate 100 in-lbs of torque, and a 5:1 ratio gear head is mounted on its output, the resulting torque will become near to 500 in-lbs.
When a motor is operating at 1,000 rpm and a 5:1 ratio gearhead is attached to it, the rate at the output will be 200 rpm. This speed decrease can improve system efficiency because many motors usually do not operate effectively at suprisingly low rpm. For example, look at a stone-grinding mechanism that requires the motor to perform at 15 rpm. This slow velocity makes turning the grinding wheel hard because the motor tends to cog. The variable resistance of the rock being surface also hinders its ease of turning. By adding a 100:1 gearhead and letting the engine run at 1,500 rpm, the engine and gear mind provides smooth rotation while the gearhead output provides a more constant power with its output rotating at 15 rpm.
Inertia matching. Servo motors generate more torque relative to frame size thanks to lightweight materials, dense copper windings, and high-energy magnets. The effect is better inertial mismatches between servo motors and the loads they want to control. The usage of a gearhead to better match the inertia of the electric motor to the inertia of the strain can enable the use of a smaller engine and outcomes in a far more responsive system that’s easier to tune.
To check out a full summary of servo motor gearbox go here.