BuberJLC
37
Unidirectional winding and rotor noises
I have the JLC Hometime for some time now. Its 975 cal. Movement uses a unidirectional automatic winding mechanism. When the rotor spins it produces a very specific sound (because of ceramic ball bearing I'd guess). After some time I noticed that certain arm movements send the rotor spinning freely on its pivot for several times producing a very audible noise - even a friend of mine noticed it. I started looking for an explanation. It happens only when the watch is fully wound. It also appears that only the winding direction of the rotor rotation has a resistance in it, while the other one does not. When the watch is fully wound and the rotor moves suddenly in rotating direction, the mainspring resistance propels the rotor back into the non winding direction and so it goes spinning freely. To me it appears like something that can cause an unnecessary wear to the rotor (although the ceramic bearing should be very wear-resistant). Has anyone else noticed the same phenomena with their JLC unidirectional movements (975,972 - any others that I don't know?)? Any thoughts on the subject?
