Turns per day, or TPD, is the total number of rotations a watch winder gives a watch in twenty-four hours. Most modern automatic watches are happy somewhere between 650 and 800 TPD, and a setting in that band suits the large majority. If you do not know your watch's figure, start at around 750 TPD and only raise it if the watch is losing power.
What does turns per day mean?
TPD counts complete rotations of the cushion, not hours of running. A winder does not spin continuously. It turns for a short period, then rests, then turns again, spreading a fixed number of rotations across the day. A winder set to 750 TPD may spend well under an hour actually moving. The rest of the time it is still, which is closer to how a watch behaves on a wrist than constant motion would be.
The number matters because an automatic watch winds from a rotor that responds to movement. Too few rotations and the mainspring slowly runs down. Enough rotations and the watch stays running with a healthy reserve.
How do I find the right TPD for my watch?
In order of reliability:
- The manufacturer. Many brands publish a recommended TPD and direction in the manual or on their support pages. This is the only source that is authoritative for your specific movement.
- The movement, not the brand. Two watches from the same maker can use different calibres with different requirements. If you know the calibre number, search on that.
- Observation. If nothing is published, set a middle figure and watch what happens over a week. This works well and costs nothing.
The observation method is simple. Set the watch to the correct time, put it on the winder at 750 TPD, and leave it for seven days. Then take it off and compare it to a reliable clock. If it has kept running and is close to where it should be, the setting is fine. If it has stopped or is running visibly slow, increase the setting a step and repeat.
What TPD should I start with?
| Situation | Sensible starting point |
|---|---|
| Manufacturer publishes a figure | Use that figure |
| Modern automatic, no figure published | 750 TPD |
| Watch stops after several days at 750 | Raise one step and retest |
| Watch with a long power reserve | A lower setting is usually enough |
| Watch with a chronograph running | A higher setting, as the chronograph draws more power |
The reason the same figure does not suit everything is that movements differ in how efficiently the rotor winds and how much power the complications draw. A simple three-hand watch with a long reserve needs less help than a chronograph with the seconds hand running.
What happens if the TPD is too low?
The watch runs down. It may keep time for a few days and then stop, or it may run continuously but at the low end of its reserve, where accuracy on some movements is poorer. Neither outcome damages the watch. You simply have not achieved the thing you bought the winder for, so raise the setting.
What happens if the TPD is too high?
On a modern automatic, nothing harmful. The barrel contains a slipping bridle that lets the mainspring slip once it reaches full wind, so extra rotations are absorbed rather than stored. What a high setting does cost you is motor running time and, over years, wear on the winder itself. There is no benefit in setting 1,950 TPD for a watch that is content at 750. We cover the mechanics of this in more detail in our article on whether a winder can overwind an automatic.
The practical rule is to use the lowest setting that keeps the watch running reliably. It is quieter, it is gentler on the winder, and it achieves exactly the same result.
Does direction matter as much as TPD?
Sometimes more. A movement that only winds in one direction will ignore half the rotations of a bidirectional programme, so it effectively receives half the TPD you set. If your watch is unidirectional and it keeps stopping despite a reasonable setting, the direction is the likely cause rather than the number. Every Stillwood winder can be set to clockwise, anticlockwise or alternating, and our guide to bidirectional versus unidirectional winding explains how to work out which your watch needs.
How do I set the TPD on a Stillwood winder?
It depends on the range. On the walnut winders and the Harcourt, from the two-watch up, each rotor has a dial for 650, 750, 850, 1,000 or 1,900 turns a day and a second dial for direction. The Belgrave cabinets set each rotor, from 650 to 1,950 and in either direction, on the touch panel or the remote. The one-watch Whitmore and Hadley and the four-watch Marlow have no turns-per-day figure to set: each rotor runs one of four fixed programmes (clockwise, anticlockwise, alternating, or a long-rest programme), and the gentle ones suit most everyday automatics. Use the instructions supplied with yours rather than a figure you have read elsewhere. The method is the same across the range:
- Wind the watch by hand a few turns and set the time before you start.
- Fit the watch to the cushion so the strap is snug and the watch cannot slide.
- Choose the direction first, then the TPD.
- Leave it for a full week before judging the result. A single day tells you very little.
If you are running several watches with different requirements, choose a winder where each rotor can be set on its own. That is what makes a multi-rotor unit such as the Kingsley or the Ravenscourt more useful than it first looks: four or six watches rarely want the same programme. For two watches, the Camborne does the same job in a smaller footprint.
Do I still need to set TPD if I wear the watch often?
If you wear a watch most days, you probably do not need a winder at all. We say this plainly in our article on whether you actually need a watch winder. TPD only becomes a question worth answering for watches that spend most of their time off the wrist.
Frequently asked questions
Is 1,200 TPD too much for a watch?
Not harmful, but usually unnecessary. Modern automatics have a slipping mainspring that absorbs excess winding, so a high setting does not damage the movement. It runs the motor more than needed. Use the lowest setting that keeps the watch going.
What TPD do most automatic watches need?
Most modern automatic movements sit in the 650 to 800 TPD range, which is the band most manufacturers quote. Check your brand's documentation where it exists, because the correct figure depends on the calibre rather than the case.
Can I set different TPD for each watch on a multi-rotor winder?
On Stillwood multi-rotor winders each rotor is set independently, so watches with different requirements can share one unit. Confirm the controls on your specific model, as the number of available steps varies across the range.
How long does delivery take?
Orders are delivered within 5 to 8 business days.