1. Dear Isaac,

    I have read your notes related to watch winders and took liberty to share with you some of my findings as well as with some of my conclusions.

    Initial statement – my small start-up VAYL Technologies has developed a watch winder which is able to determine the state of main spring and stop winding (turning) at the moment when mainspring is fully winded. Details may follow if you are interested.

    This development initially pursued the goal to eliminate unnecessary winding, causing excessive wear and tear of slipping clutch mechanism of expensive watch

    After hundreds if not thousands of experiments within last two years with several automatic watches several conclusions could be made. Here they are –

    1. Assuming watch is totally dead, it may take from 800 to 1800 turns to fully wind it. This result may be corrected, because it relates to 8 different watches we have experimented with. They are Blancpain, IWC, Longines, Hamilton, Chronoswiss, Seiko, Rolex, Raymond Weil.

    2. This total number of turns heavily depends on speed of rotation and on plane watch is located while rotating. As such, watch located in vertical plane requires significantly less turns then same watch placed on the plane at angle of 45 degrees.

    3. Each watch requires different number of turns, and as such, after 24 hours of full winding particular watch may require from 300 to 800 turns (depending on power reserve) It is clear that if any of existing winders is set up for 600 TPD, some of the watches will be exposed to unnecessary turns and some of them will stop in several days. 900 TPD will definitely cause excessive wear and tear, and I am not even talking about 1200. BTW these numbers will not guarantee full winding to all watches if initially watch was dead. Under no circumstances our winder performs extra turns or stops turning when desired level of tension is not achieved.

    4. Data bases related to number of turns on many different sites are very inaccurate, because they are not taking into account issues of 2) and 3)

    5. Our winder is capable to automatically determine the direction of turning and maintain the state of mainspring within certain limits established by owner. As an example one may want to keep expensive watch winded between 30% and 80% of full tension. In our opinion that may increase the longevity of watch.

    I will be glad to provide you with more info if you are interested.

    Best regards,

    Yuliy Lieb

    1. Author

      Hi Mr Lieb. That’s truly a fantastic product! I believe your company’s winder uses a sensor to determine the current tension in the mainspring?

      By the way, I’m interested with what you said about keeping the power reserve at most 80% to increase a watch’s longevity. Does this mean that wearing a watch for a long time (say from early morning to midnight, more than 15 hours) will has bad effect on it?

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