The movements of the individual joints need to be controlled in order for the manipulator to perform a desired waft its body, arm, motion and wrist. The is provided with the useful beneficial  aid of the usage of the pressure tool used to power the robot. 
Mechanical Drive Systems 
The stress device determines the charge of the arm motion, the power of the robotic, dynamic performance, and, to 3 extent, the kinds of application. 
A robotic ought to require a stress device for shifting their arm, wrist, and body. A stress device is commonly used to decide the functionality of a robotic. For actuating the robotic joints, there are 3 precise kinds of stress structures to be had such as:  
(i) Electric Drive System: 
The electric powered  stress structures are able to shifting robots with excessive power or pace. The actuation of this form of robotic may be finished with the  useful beneficial aid of the use of every DC servo automobiles or DC stepping automobiles. It may be well –superb for rotational joints and similarly to linear joints. The  stress device may be great for small robots and precise applications. Most importantly, it has had been given greater accuracy and repeatability. The one downside of this device is that it`s an extended manner barely costlier.
Hydraulic Drive System: 
The hydraulic pressure systems are really supposed for the large –sized robots. It can deliver immoderate electricity or pace than the electric pressure systems. This pressure tool can be used for every linear and rotational joints. The rotary motions are provided with the useful beneficial  resource of the use of the rotary vane actuators, on the identical time because of the reality the linear motions are produced with the useful beneficial  resource of the use of hydraulic pistons. The leakage of hydraulic oils is considered due to the truth the critical drawback of this pressure. 
Pneumatic Drive System: 
The pneumatic pressure systems are specifically used for the small type robots, which have masses masses masses masses a good deal much less than five stages of freedom. It has the capability to offer terrific accuracy and pace. This pressure tool can produce rotary movements with the useful beneficial resource of the use of actuating the rotary actuators. The translational movements of sliding joints furthermore may be provided with the useful beneficial useful resource of the use of walking the piston. The charge of this tool is a lot masses a good deal much less on the identical time as in evaluation to the hydraulic pressure.