In order to do different jobs, a robotic arm get a special ‘hand’ for each job. There are many types of special ‘hands’ called ‘end effectors’. One common end effector can grasp and carry different objects. To give a robotic hand a sense of touch, it has built-in load cells that tell the computer how hard the industrial robot is gripping a particular object. This keeps the industrial robot from dropping or crushing whatever it’s carrying. Other end effectors include blowtorches, drills and spray painters. A robotic arm might twist the caps onto peanut butter jars coming down an assembly line or drill holes, or pick up a piece and put it on another piece. An industrial robot can often do this repetitive work more efficiently than human beings because they are so precise. A robot always drills in the exactly the same place, and always tightens bolts with the same amount of force, no matter how many hours it’s been working. Many industrial robots work in auto assembly lines, putting cars together. An industrial robot is very strong, lifting large car pieces easily, and never get tired. Even though an industrial robot is capable of great strength, it is also capable of performing very delicate operations as well. This makes them very useful in the computer industry which requires an incredibly precise hand to put together a tiny microchip.