Smoothness and lack of ripple are essential for the printing of elaborate color pictures on reusable plastic cups offered by fast-food chains. The colour image is made up of an incredible number of tiny ink spots of many colours and shades. The complete cup is printed in one complete (unlike regular color separation where each color is certainly printed separately). The gearheads must operate efficiently enough to synchronize ink blankets, printing plates, and glass rollers without presenting any ripple or inaccuracies that may smudge the image. In cases like this, the hybrid gearhead reduces motor shaft runout error, which reduces roughness.
Sometimes a motor’s capability may be limited to the stage where it needs gearing. As servo manufacturers develop better motors that can muscles applications through more difficult moves and create higher torques and speeds, these motors need gearheads equal 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 therefore. Using a gearhead with a servo engine or using a built-in gearmotor can enable the use of a smaller motor, thereby reducing the system size and price. There are three major advantages of going with gears, each which can enable the use of smaller motors and drives and for that reason lower total system cost:
Torque multiplication. The gears and number of tooth on each gear create a ratio. If a engine can generate 100 in-pounds of torque, and a 5:1 ratio equipment head is attached to its output, the resulting torque will end up being close to 500 in-lbs.
When a motor is operating at 1,000 rpm and a 5:1 ratio gearhead is attached to it, the speed at the output will be 200 rpm. This speed reduction can improve system performance because 
many motors do not operate efficiently at suprisingly low rpm. For example, look at a stone-grinding mechanism that will require the motor to perform at 15 rpm. This slow swiftness makes servo motor gearbox turning the grinding wheel tough because the motor tends to cog. The variable resistance of the stone being ground also hinders its simple turning. With the addition of a 100:1 gearhead and letting the electric motor run at 1,500 rpm, the engine and gear head provides smooth rotation while the gearhead output provides a more constant force with its output rotating at 15 rpm.
Inertia matching. Servo motors generate more torque relative to frame size thanks to lightweight components, dense copper windings, and high-energy magnets. The result is better inertial mismatches between servo motors and the loads they want to control. The use of a gearhead to better match the inertia of the engine to the inertia of the load can enable the use of a smaller motor and outcomes in a far more responsive system that is easier to tune.