Robotic motion is described in terms of degrees of freedom.
Some robots have more than six degrees of freedom, some less, depending on the kind of work they do.
Learn more about the basic six degrees of freedom and how they function. It can be used to activate robotic parts. The force of the contraction is surprisingly strong, approaching 22,000 pounds per square inch. Even a hair-thin nitinol wire six thousandths of an inch thick can lift 11 ounces. Not all robotic actuators are electric.