
1) Disk drive mechanism 2) He initiates 3) Mechanical controller 4) Mechanism
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https://www.crosswordclues.com/clue/actuator

An actuator is a type of motor that is responsible for moving or controlling a mechanism or system. It is operated by a source of energy, typically electric current, hydraulic fluid pressure, or pneumatic pressure, and converts that energy into motion. An actuator is the mechanism by which a control system acts upon an environment. The control sys...
Found on
http://en.wikipedia.org/wiki/Actuator

• (n.) One who actuates, or puts into action.
Found on
http://thinkexist.com/dictionary/meaning/actuator/

A device which transforms an electric signal into a measured motion using hydraulic, pneumatic or pyrotechnic (explosive) action.
Found on
http://www.braeunig.us/space/glossary.htm

functional unit that generates from the controller output variable the manipulated variable required to drive the final controlling element NOTE - If the final controlling element is mechanically actuated, it is controlled via an actuating drive. The actuator drives the actuating drive in this case.
Found on
http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=351-28-07

the part of the actuating system to which an external actuating force is applied NOTE - The actuator may take the form of a handle, knob, push-button, roller, plunger, etc.
Found on
http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=441-15-22

the integral part of a component to which an external force is to be applied. Movement of the actuator provides a mean for activating or desactivating the component
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=581-11-09

A device used to convert fluid energy into mechanical motion.
Found on
http://www.encyclo.co.uk/local/21121

A device for moving a control surface or throttle by electro-mechanical means
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http://www.encyclo.co.uk/local/22135

A mechanical assembly that positions the read/write head assembly over the appropriate tracks.
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http://www.encyclo.co.uk/visitor-contributions.php

An output device which can perform straightforward mechanical tasks, e.g. in Virtual Reality it provides a tactile feedback to the user.
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http://www.encyclo.co.uk/visitor-contributions.php
Ac'tu·a`tor noun One who actuates, or puts into action. [ R.]
Melville. Found on
http://www.encyclo.co.uk/webster/A/24

[
n] - a mechanism that puts something into automatic action
Found on
http://www.webdictionary.co.uk/definition.php?query=actuator

A device which controls or operates another device.
Found on
https://www.encyclo.co.uk/local/20687
noun a mechanism that puts something into automatic action
Found on
https://www.encyclo.co.uk/local/20974

A component such as a cylinder, motor, or rotary device that directly helps convert fluid energy into mechanical energy.
Found on
https://www.encyclo.co.uk/local/21004

A device operated either electrically, pneumatically, or hydraulically that acts as a motor to change the position of movable devices such as valves or dampers.
Found on
https://www.fieldwire.com/resources/construction-glossary/

a person or thing that actuates. · a servomechanism that supplies and transmits a measured amount of energy for the operation of another mechanism or system.
Found on
https://www.infoplease.com/dictionary/actuator
No exact match found.