Watch wind down with watch winder

[tkyong1]

Hi guys,

I have a watch winder, using it with my Mido Commander and Seiko automatic.

The watch winder has 4 settings:
a. 2 min clockwise, rest 6 min, repeat.
b. 2 min anticlockwise, rest 6 min, repeat.
c. 2 min clockwise, rest 6 min, 2 min anticlockwise, rest 6 min, repeat.
d. 3 hours clockwide + anticlockwise, rest 9 hours.

I am using setting d for months.
I just acquired my seiko automatic (new) last week.
I noticed my seiko wind down if i left the watch in the winder for couple days. But my Mido doing fine.
I have no clue  all setting wind 6 hours in 24 hours, it should be allright. In fact, my Mido did not complain and never wind down for a year or so.
Need your advice..

[TheHobbit]

The ETA movement in the Mido has a more efficient automatic winding system as compared to the Seiko (I am assuming the movement is the 7S26 or 36). Basically it takes more rotation of the rotor in the Seiko to wind the mainspring arbor one rotation. I believe it is about 160 to 170 turns of the rotor. Basic ETA movement is about 150 turns. It may look little, but to you need to calculate this to how many turns of the mainspring arbor to fully wind the system.

Also the dead angle on a Seiko movement is larger on the Seiko. The dead angle is the angle of the back and forth movement of the rotor will go through without any winding energy transmitted to the barrel. So all these, and I am sure there are other, contribute to the fact that the Seiko can wind down faster compared to your Mido.

[takashi78]

Might be the Seiko is a uni directional winding only?

[TheHobbit]

Might be the Seiko is a uni directional winding only?

Maybe, but I suspect most Seiko would have the 'Magic Lever Winding System'.





How the system works.

When the gear (magic wheel) rotates clockwise, it will 'pull' the top lever and that lever will pull the winding wheel. When the gear rotates anti-clockwise, the lever will 'push' the winding wheel. So regardless the direction of rotor rotation, the winding wheel will turn and wind the mainspring.

[jacky8888]

wow Hobbit.... with the comic strip above, it is much easier to understand now....
thanks for sharing....