It is the question new watch winder owners ask most, and the one with the most contradictory answers online. Here is what you need to know to set yours correctly.
What turns per day means
TPD (turns per day) is the number of full rotations the winder gives your watch over twenty-four hours.
The figure is not arbitrary. It matches the energy the movement needs to keep its mainspring wound. A watch worn every day receives the equivalent of several hundred rotations from its owner's movements. The winder reproduces that.
One point to understand: the winder does not turn continuously. It alternates rotation sequences and rest periods spread across the day. A setting of 800 TPD therefore does not mean eight hundred turns in a row, but eight hundred turns spread over twenty-four hours.
The range that suits almost everything
Between 650 and 800 turns per day. This range covers the vast majority of automatic calibres on the market, whether an ETA 2824-2, a Sellita SW200, a Seiko NH35, a Miyota 9015 or a Rolex 3135.
If you do not know the exact recommendation for your movement, set your winder to 800 TPD, bidirectional. This setting carries no risk and will work for the overwhelming majority of watches.
A few calibres need more (some watches with multiple complications go up to 1,000 or 1,200 TPD), but they remain the exception.
Rotation direction matters as much as the number
Setting the right rate in the wrong direction is the same as not setting anything at all.
Most modern movements wind in both directions. But some only wind in one direction, and the mistake is then invisible: the winder turns, the watch seems looked after, and yet it stops after two days.
The most common cases to know:
| ETA / Valjoux 7750 | clockwise only |
| Sellita SW500 | clockwise only |
| Miyota 8215 and 821A | anticlockwise only |
For the others, alternating or bidirectional mode works. We publish the settings for thirty-nine movements on our Settings by calibre page.
Do too many turns damage the watch?
No, and it is worth saying clearly, because this fear leads many owners to under-set their winder.
All modern automatic movements have a slipping bridle: a device that lets the mainspring slip once it is fully wound. The mechanism cannot be forced, however long the watch stays on the winder.
The TPD setting is not there to prevent breakage. It is there so the mechanism does not work harder than necessary over years of use: a matter of slow wear, not immediate risk.
How to check your setting is right
The method is empirical and takes three days.
- Wind your watch by hand with about twenty turns of the crown, set the time and put it on the winder.
- Leave it running for three days without touching it.
- Take the watch off and set it down. If it holds its stated power reserve, your setting is correct.
If it stops early, increase the rate by one step. If it holds easily, you can lower it: the mechanism will work less.
When the question does not arise
If your watch is hand-wound, no setting will help: its mechanism has no oscillating weight, and no rotation will wind it. This is the case for the Speedmaster Professional, the Unitas 6497 and 6498 calibres, and most vintage pieces from before the 1960s.
In that situation, what you need is a watch box. A quartz watch does not need a winder either.
In short
Set 800 TPD, bidirectional, if you are not sure. Check the direction your calibre requires: it is the most costly and most common mistake. And do not worry about over-winding: it does not exist on a modern movement.
A question about your watch? Email us the reference at contact@maisonorvian.com. We reply within one working day, including to tell you when a winder is not necessary.