Mechanical Hi-Beat 36000
Caliber 9S85
The challenge of making a high-beat movement is one that only a few watchmakers choose to accept. With its higher oscillation rate of ten beats per second, greater accuracy is achievable, but this increased precision comes at a price because the faster rotational speed can take its toll on the power reserve and even the longevity of the whole movement. Grand Seiko's 10 beat movement meets these challenges and delivers an accuracy of +5 to –3 seconds a day, a power reserve of 55 hours and the durability for which every Grand Seiko watch is renowned. Caliber 9S85 is the result of many years of development and of advances both in the design and manufacture of components and in the materials themselves.
Especificações
| Mecanismo de corda | Automatic with manual winding mechanism |
|---|---|
| Índice médio diário | +5 to -3 seconds per day |
| Precisão com o uso normal | +8 to -1 seconds per day |
| Reserva de marcha | Approximately 55 hours |
| Vibrações | 36,000 vibrations per hour (10 beats per second) |
| Número de rubis | 37 jewels |
| Características | -Date display |
The Challenge of the 10 Beat Movement
Although the theoretical advantages of the 10 beat movement are well known, to produce a watch that is durable, reliable and precise is extremely difficult. The two main difficulties are driving time and movement durability. A rapidly oscillating balance wheel requires a lot of power from the mainspring. The mainspring must be able to supply the balance wheel with the energy it needs to move back and forth at high speed. The wound mainspring has to be able to deliver a high level of torque to be able to supply enough power to the balance wheel for long enough to ensure a high power reserve. At the same time, the escapement mechanism that transfers the oscillations from the balance wheel through to the gear wheel train has to be as durable as any other mechanical watch. A formidable challenge indeed.
THE HAIR SPRING
New Materials to Enhance Fundamental Performance
Using the experience accumulated over the 60 years of Grand Seiko’s history, a new generation of Spron alloys was developed for the hair spring, which is at the very heart of any watch movement and whose performance determines the precision of the watch over time.
After some five years of development, a new alloy was created. Compared with previous alloys, it had around twice the impact resistance, and a magnetic resistance more than three times higher.
THE ESCAPEMENT MECHANISM
MEMS Technology to Enhance Component Precision
Precision engineering is the route to greater accuracy in every watch, but most of all in a high beat caliber. Thanks to technologies developed in-house for semiconductor manufacturing, the escape wheel and pallet fork used in Caliber 9S85 are made with a precision of one ten thousandth of a millimeter and therefore deliver greatly enhanced performance. The secret is MEMS. MEMS (Micro Electro Mechanical System) is a technology that allows these critical components to be lighter, smoother and, in the case of the escape wheel of a more intricate design. The new design of the escape wheel featured oil reservoirs at the end of each gear tooth, improving the retention of oil, on which the smooth working of the gear depends.
THE MAINSPRING
Increased Torque for High-speed Oscillation and a longer Power Reserve
A 10 beat movement must have a mainspring that can ensure a high level of torque to supply the power required for the increased oscillating rate. After six years of development a new alloy was developed for the mainspring. It delivers about 6% more power than its predecessor and a power reserve of five more hours while maintaining the same degree of corrosion resistance, durability, and magnetic resistance. The new mainspring powers the Grand Seiko 10 beat movement for a remarkable 55 hours when fully wound.
