Deep Dive

The 101 on the Peripheral Rotor. And the watches that have it

Ever since with the introduction of the Calibre A1000 that featured a weighted geared ring by Carl F. Bucherer, peripheral rotors have become quite popular amongst timepiece manufacturers. Here’s a lowdown on the mechanism

Commonly made in stainless steel, the oscillating weight, or the rotor, is a key component in the winding mechanism of automatic watches. A semicircular disc, it turns freely to wind the mainspring through a pivoting movement, which in turn powers the watch. A traditional, typical rotor, it is set on the mainplate of the movement. What makes the peripheral rotor different, is that, as the name suggests, it is set on the periphery of the movement. It interacts with the gears set into the side of the movement to move the mainspring.



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