The crown, when turned all the way, transmits torque through the wheel system to the spiral spring, creating a reserve of energy that determines how long it will take until the movement next stops. It is this tense factory is the starting point for the entire complex kinematic chain, transforming the chaotic desire of the spring to unwind into a strictly regulated movement of the arrows. Without the initial mechanical impact of the user or the automatic rotor, not a single element of the system will move, since the mechanics do not have an external power source such as a battery.
Unlike quartz analogues, where the crystal sets the frequency, here all the magic lies in the physical interaction of metal parts, each of which is critically important. The working principle of a mechanical watch is based on the balance between accumulated energy and its dosed release through the stroke controller. Understanding these dynamics allows the owner not only to properly operate the accessory, but also to diagnose primary signs of wear or the need for lubrication.
Power source: mainspring and plant system
The heart of any mechanical chronometer is mainspring (mainspring), enclosed in a drum. This is a long strip of special steel or alloy that, when twisted, accumulates potential energy. Modern models often use alloy Nivaflex, which has high elasticity and resistance to magnetic fields, which ensures stable operation throughout the entire period of operation.
The process of energy transfer begins with the rotation of the crown, which, through the system winding lever and the wheel gear tightens the spring. It is important to understand that a spring cannot be stretched indefinitely; it has an elastic limit, after reaching which the friction sliding mechanism is activated, preventing metal rupture. This is why, when wound by hand, you feel a characteristic resistance at the end of the stroke.
⚠️ Attention: Never apply excessive force if you feel a sudden stop in the rotation of the head. In mechanisms without protection against rewinding, this can lead to breakage of gear teeth or deformation of the spring itself.
In automatic models (automic) an inertial load is added to the system - a rotor, which rotates when the owner’s hand moves. Through a system of reduction wheels, it transmits rotation to the drum shaft, winding the spring without the participation of human fingers. The effectiveness of this process depends on the design of the rotor bearings and the quality of the lubricant.
Wheel drive and torque conversion
The accumulated energy must not only be released, but also properly distributed. Responsible for this wheel drive (gear train), consisting of a sequence of gears of different diameters and numbers of teeth. The first gear, the center gear, is connected directly to the spring barrel and makes one full revolution per hour, driving the minute hand.
Next, the torque is transmitted to the intermediate wheels, which act as a gearbox, reducing the rotation speed and increasing the accuracy of impulse transmission. The end point of this chain is the seconds wheel, which rotates the fastest and is responsible for counting the seconds. All wheel axles are mounted on stones (ruby bearings), which minimizes metal-to-metal friction and prevents rapid wear.
- ⚙️ Center wheel: transmits rotation to the minute hand and is connected to the calendar module.
- ⚙️ Intermediate wheel: coordinates the rotation speed between the center and the seconds axis.
- ⚙️ Seconds wheel: has an elongated axis on which the second hand is mounted.
The quality of gear teeth processing directly affects the smoothness of operation. Expensive models use evolute tooth profiling, which ensures ideal engagement and minimizes energy loss due to friction. Any roughness or microscopic deformation can cause the mechanism to stop or lose accuracy.
Stroke control: balance and spiral
The most important node that determines precision, is an oscillator. It consists of a balance (flywheel) and a balance spring. A balance is a wheel with a heavy rim that oscillates back and forth. The spiral attached to its axis twists and unwinds, returning the balance to its original position.
The frequency of balance oscillations is the standard of time for the mechanism. In modern standards, the most common frequency is 28,800 vibrations per hour (4 Hz), although there are models with 18,000 (2.5 Hz) or high-frequency 36,000 (5 Hz). The higher the frequency, the higher the potential accuracy and resistance to external shocks, but the higher the wear of the lubricant.
Effect of temperature on the spiral
Alloys such as Glucydur and coil shapes (such as Breguet overcoil) are designed specifically to compensate for the thermal expansion of the metal, so that the watch does not rush in the heat or lag in the cold.
To adjust the speed, use a thermometer with movable pins or screws on the balance rim. By moving the pins, the master changes the effective length of the working part of the spiral, accelerating or slowing down the vibrations. This is a delicate setting that requires professional equipment and skills.
Anchoring mechanism: the heartbeat of time
The link between the continuous force of the spring and the intermittent oscillations of the balance is anchor mechanism (escapement). Its task is to “cut off” the energy of the wheel transmission, transferring it to the balance in small portions (impulses) exactly at the moment when it is necessary to maintain vibrations.
The main elements are the anchor fork and the anchor wheel (running wheel). The teeth of the travel wheel have a special shape that allows them to slide along the bevels of the fork pallets, transmitting momentum, and then lock, keeping the wheels from freely rotating. The characteristic “tick-tock” sound is the sound of the teeth hitting the anchor pallets.
| Parameter | Swiss anchor | Straight anchor | Cylinder escapement |
|---|---|---|---|
| Efficiency | High | Average | Low |
| Accuracy | Maximum | good | Low |
| Application | Modern watches | Pocket watch | Antiques |
Modern materials such as silicon are used to make anchor forks and spirals, as they do not require lubrication, are not magnetized and have ideal geometries obtained by photolithography. This significantly increases the reliability of the mechanism in the long term.
If your watch suddenly stops, do not shake it aggressively. Try 20-30 gentle rotations of your wrist to wind automatic models, or gently rotate the crown for manual ones.
Time display and additional functions
After the energy has passed from the spring through the wheels and regulator, it is transmitted to the dial. The pointer mechanism is a separate friction unit that allows you to move the hands without stopping the movement. The minute tube is mounted on the central tube with friction, and the hour tube is connected to the minute tube through a system of additional wheels.
Complex functions, or complications, such as a calendar, chronograph or moon phases, require the implementation of additional modules. For example, the date mechanism switches abruptly around midnight, using the stored energy of the spring to instantly reset the disc. A chronograph is an independent time keeping system with its own starting and stopping mechanism.
- 📅 Calendar: requires adjustment in months with fewer than 31 days.
- ⏱️ Chronograph: does not improve accuracy, but only serves as a stopwatch.
- 🌙 Moon phases: the longest-lasting mechanism, requiring correction every 2-3 years.
Each additional feature increases the number of parts and load on the mainspring, which can reduce power range. Therefore, watches with more complications often require better and more frequent maintenance.
☑️ Diagnosis of watch condition
Factors Affecting Accuracy and Durability
A mechanical watch is a living organism, sensitive to external conditions. Magnetic fields are one of the main enemies: they can magnetize the spiral, sticking the turns of which will lead to a strong rush. Current ISO 764 standards require a robustness of up to 60 gauss, but powerful speakers, tablets and magnetic bag clasps can produce stronger fields.
Shocks and vibrations are also dangerous. A sharp impact can shift the balance, break the axis or damage the anchor pallets. While everyday walking or clapping is safe, playing golf, tennis or working with a hammer drill is strongly discouraged for mechanics. High frequency vibration destroys the lubricant structure and loosens the fasteners.
⚠️ Attention: Water getting into the mechanism is a critical situation. Even if a watch is labeled as waterproof, the rubber seals will age over time. Check the seal once a year, especially before contact with water.
Temperature changes affect the viscosity of oils and the dimensions of metal parts. Sudden cooling can condense moisture inside the case, causing corrosion. Ideal storage conditions are room temperature, no direct sunlight and low humidity.
Regular maintenance (every 3-5 years) is the only way to maintain manufacturer's stated accuracy and prevent costly wear and tear.
Comparison of types of mechanical mechanisms
When choosing a watch, it is important to understand the differences between the different types of movements. In-house calibers are developed and produced by the watch company itself, which guarantees high quality and uniqueness. Reference mechanisms (eg ETA or Sellita) are purchased from specialized manufacturers and can be customized by the brand.
Chinese movements (Seagull, Hangzhou) have shown tremendous progress in recent years, offering reliable solutions with turbillon functions at an affordable price. Japanese mechanics (Miyota) are famous for their utilitarianism and durability, although they are often inferior in fine finishing to their Swiss counterparts.
The choice between manual and automatic winding is a matter of preference. Manual winding gives a tactile feeling of connection with the movement and allows for thinner watches. Automatic winding is more convenient for daily wear, but makes the case more massive and requires wearing even when the watch is lying on a shelf (or using a watch box).
Why can mechanical watches be fast or slow?
The main reason is a change in the viscosity of the lubricant, demagnetization of the spiral, wear of parts or a violation of the adjustment of temperature compensators. The position of the clock in space (vertical or horizontal) also affects, which creates different loads on the axes.
How often should you wind your automatic watch when you're not wearing it?
If you do not wear your watch every day, it is better to use a special watch winder or wind it manually every 2-3 days so that the lubricant does not stagnate and the spring does not lose elasticity.
What is power reserve and what does it depend on?
The power reserve is the operating time of a fully wound watch before stopping. It depends on the length and strength of the spring, the amount of energy consumed by the mechanism (especially if there are complications), and the efficiency of torque transmission. The standard is 38-42 hours, modern models can reach 7-10 days.