Key takeaway: Watch winder settings involve two parameters: the number of turns per day (TPD) and the direction of rotation. Both depend on the watch’s movement and are found in its manual. Most automatic watches require 650 to 950 turns per day; if unsure about the direction, bidirectional mode suits almost all movements. More turns do not wind better: a correct setting is sufficient.
You’ve just placed your automatic watch on a winder, and the device asks you two things: how many turns per day, and in which direction. Default settings are not always suitable, and a watch stopping on its winder is almost always a matter of setting, not a malfunction.
The good news is that setting a watch winder takes only a few minutes. The correct values depend on your watch’s movement, its caliber, not its brand or price. Here’s how to interpret these two parameters, how to find your watch’s values, and what to check if it still stops.
TPD: What “Turns Per Day” Means
In an automatic watch, an oscillating weight, the rotor, pivots with every wrist movement. As it turns, it winds the mainspring, which stores the watch’s energy. When placed on a table, the watch no longer receives any movement: it runs on its power reserve, often 38 to 80 hours, then stops.
The winder replaces your wrist. It rotates the watch according to a program, and TPD indicates the number of complete rotations it performs in 24 hours. This is the first setting offered on most automatic watch winders, and the one that determines whether the watch stays on time or stops overnight.
Winder Settings: How Many Turns Per Day?
There is no universal value: each movement requires a specific number of rotations to stay wound. The most reliable approach is to start with your watch’s reference and the name of its movement, which can be found on the warranty card, in the booklet, or on the manufacturer’s website. The model’s manual often provides the recommended value; if not, the brand’s customer service can provide it based on the reference.
To give you an idea, the vast majority of automatic watches are content with 650 to 950 turns per day. Some movements, particularly certain chronographs or those with small rotors, require more, sometimes over 1,000. Start with the manufacturer’s indicated value, then observe the watch for a few days: if it keeps time normally and never stops, the setting is good.
However, there’s no need to choose the highest value “just to be safe.” A watch that is already wound does not store more energy just because it rotates more: excessive rotations only wear out the rotor and its bearings.
Clockwise, Counter-clockwise, or Bidirectional: Which Direction to Choose?
The second setting concerns the direction in which the rotor winds the spring. Some movements wind regardless of the rotor’s rotation direction, others in only one direction. Winders therefore offer three modes:
- Clockwise: the watch rotates clockwise, for movements that wind in this direction.
- Counter-clockwise: the reverse rotation, for movements that wind in the other direction.
- Bidirectional: the winder alternates between both directions; this is the case for many common movements, such as the ETA 2824-2.
The winding direction can be found in the manual or the movement’s documentation. Do not deduce it from the direction you turn the crown: manual winding and automatic winding are two distinct mechanisms. If you have no information, bidirectional mode is the safest choice: regardless of the movement, some of the rotations will wind it. Just remember to maintain a sufficient TPD, as only half of the turns are useful for a unidirectional movement.
Fixed Program or Programmable Winder
Not all winders are set in the same way. Fixed-program models rotate according to a predefined cycle, designed to suit the largest number of watches. The SwissKubik StartBox winder is a good example: it performs approximately 1,600 rotations per day, 800 clockwise then 800 counter-clockwise, with no settings required. It runs on batteries, allowing it to be placed in a safe or on a shelf without a power outlet.
This bidirectional program suits most automatic watches. For a unidirectional movement or a watch that requires a specific TPD, a programmable model is better. The SwissKubik MasterBox winder starts with the same 1,600 rotation program but can be adjusted via an app, Bluetooth, or USB-C: number of rotations, direction, and pause durations. This is the solution to consider if you own several watches with different needs, or a timepiece whose manual specifies a precise setting.
Can an automatic watch be overwound?
This is the most common fear, and it is unfounded. Automatic watches are equipped with a slipping bridle: when the spring is fully wound, this component slips in the barrel and prevents it from being tightened further. The spring therefore cannot break because the winder turns too much.
However, excessive TPD is still unnecessary: the oscillating weight and its bearings rotate for nothing, and wear out a little faster. This is why winders do not run continuously. They alternate between rotation phases and pauses, which mimic the moments when the watch is worn and then set down, distributing the turns throughout the day. On a programmable model, the duration of these pauses can also be adjusted.
Your watch stops on the winder: what to check?
A watch that stops while on its winder almost always lacks power, for one of these reasons:
- The direction does not match the movement: in clockwise or counter-clockwise mode, a movement that winds in the other direction receives nothing. Switch to bidirectional or check the manual.
- The TPD is too low: increase it in increments of about a hundred turns and observe the watch for a few days.
- The watch was already stopped: a winder maintains a reserve; it fills it slowly. First, manually wind the watch via the crown if its movement allows, or wear it for a few hours, then set the time before placing it on the winder.
If the watch still stops with a correct setting and a full power reserve, it probably needs servicing: in that case, consult a watchmaker, not the winder. Before reaching that point, always check these two settings: they explain the vast majority of stops.
When properly set, a winder keeps your watch on time, with its date and any complications, without you having to restart it every time. To find out when it’s truly worth it, read our article what is a watch winder for.
FAQ
Set the value indicated by the manufacturer for your watch’s movement, which can be found in the manual or from customer service. Most automatic watches are content with 650 to 950 turns per day; some movements require more. Then observe the watch for a few days to confirm the setting.
In the direction the movement winds: clockwise, counter-clockwise, or both directions. The watch manual indicates this. If you have no information, choose bidirectional mode with a sufficient number of turns: it suits almost all movements.
No, it cannot break the spring: a slipping bridle prevents it from being tightened beyond its maximum. However, a very excessive number of turns unnecessarily wears out the rotor and its bearings. A setting adapted to the movement is sufficient.
Most often, the direction of rotation does not match the movement, or the number of turns per day is too low. Check these two settings, manually wind the watch if it was stopped, then place it back. If it still stops, have it serviced.
Not always. A fixed-program, bidirectional winder suits most automatic watches. A programmable model becomes useful for a movement that winds in only one direction, a watch that requires a particular number of turns, or a collection with different needs.