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Science continues to make major advancements in mechanical energy. The science of how actuators convert potential energy into mechanical energy or motion continues to be a hot scientific topic. Many scientists believe that actuators hold the future not only for robotics, but for medical purposes as well. The more scientists discover about actuators, the more it helps all of mankind.

The way in which a linear actuator works is that there is a motor that rotates a drive screw using a synchronous timing belt drive. Some linear actuators can also use a worm gear drive or direct drive. Which ever the choice, the turning of the screw pushes a drive nut along the screw, which in turn pushes the rod out and rotating the screw in the opposite direction will retract the rod. According to the Association of Sciences, the drive screw is either an ACME or ball thread or is belt-driven which is what gives the machine its motion. A cover tube protects the screw nut from environmental elements and contamination thus allowing for the machines use continually without the chance of it getting gummed up. Radial thrust bearings permit the screw to rotate freely under loaded conditions and gives the linear actuator its strength.

Advanced motion control systems use actuators. Control systems are devices used to move or control objects and are found everywhere. These computer controlled systems are made possible by advancements in actuators.

There are various forms of energy that run actuators. These forms of energy include, hydraulic, pneumatic, mechanical and electrical. Linear actuators are used a lot in robotics and factory automation.

The type of actuator used depends on the need of motion. Linear actuators are used when an object needs to move in a straight line. Also, one needs to consider the stroke length (how far one rotation moves an object) and the load rating (how heavy the object that is being moved can be). Also, you probably want to get an actuator that can be programmed. One of the biggest things people over look when buying an actuator is space requirements. Make sure your project includes enough space for the actuator. Certain hackable robots will automatically include expanded space for various size actuators.

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