Rotor
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The rotor feature is an example of form and function, especially in high-quality watchmaking.It is a semi-circular weight located in the heart of the automatic watch. It was the mechanism that wound the mainspring through the movements of the wearer's wrist. With every movement of the wearer, the rotor swings and pivots to convert kinetic energy into potential energy by tensing the mainspring. This self-winding method eradicated the need for hand-cranking, and as long as it was worn regularly, it would stay powered.
 
A rotor of gold or stainless steel can be visible through a transparent caseback or a sapphire crystal. This adds an element of mechanical beauty to the design of a watch. Efficiency and reliability are very important for a rotor as their constant performance is relied upon to ensure a stable working of an automatic watch-this is one of the most sophisticated points of engineering about this vital part.

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