The MG996R is a metal gear servo motor with a maximum stall torque of 11 kg/cm. Like other RC servos the motor rotates from 0 to 180 degree based on the duty cycle of the PWM wave supplied to its signal pin.
This is a Gear Motor w/Encoder, model No. GB37Y3530-12V-90EN. It is a powerful 12V motor with a 90:1 metal gearbox and an integrated quadrature encoder that provides a resolution of 16 counts per revolution of the motor shaft, which corresponds to 1440 counts per revolution of the gearbox’s output shaft.
These units have a 0.61″ long, 6 mm-diameter D- shaped output shaft. This motor is intended for use at 12V, though the motor can begin rotating at voltages as low as 1V.
The face plate has six mounting holes evenly spaced around the outer edge threaded for M3 screws. These mounting holes form a regular hexagon and the centers of neighboring holes are 15.5 mm apart.
This motor is an ideal option for your mobile robot project.
Note: Do not screw too far into the mounting holes as the screws can hit the gears. Manufacturer recommends screwing no further than 3mm (1/8″) into the screw hole.
6V 60Rpm Geared DC Motor is a mini geared motor with high torque capability despite its small size and because of that it is very suitable for small sized projects that require high torque such as sumo robots. The motor runs at 60rpm at 6V. It is suggested not to run the motor at voltages higher than 6V.
The TowerPro SG90 9g Mini Servo is 180° rotation servo. It is a Digital Servo Motor which receives and processes PWM signal faster and better. It equips sophisticated internal circuitry that provides good torque, holding power, and faster updates in response to external forces.
The CYS-S8218 is a well designed and high quality servo which is digital, fitted with metal gears for reliability. It is made of high quality material, which may make your operation much more remarkable.