Balance Wheel

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What is a Balance Wheel?

The balance wheel is a vital component in mechanical watches and serves as the regulating organ of the movement. It oscillates back and forth, driven by the mainspring's power, and controls the release of energy to ensure the watch's accuracy. The balance wheel's precise timing is achieved through the adjustment of its weight, length, and rate of oscillation. Its smooth and consistent motion, aided by the hairspring, contributes to the watch's stability and precise timekeeping.


What are the functions of Balance Wheels?

  • Regulation: The balance wheel regulates the release of energy from the watch's mainspring, controlling the speed at which the gears and hands move. This regulation ensures that the watch keeps accurate time.
  • Oscillation: The balance wheel oscillates back and forth, driven by the power of the mainspring. Its oscillations are controlled by the interaction between the balance spring (also known as the hairspring) and the balance wheel. The balance spring stores and releases energy, allowing the balance wheel to maintain a consistent and precise rhythm.
  • Isochronism: The balance wheel and the hairspring work together to achieve isochronism, which means the watch maintains consistent accuracy regardless of the power reserve level. This is essential for precise timekeeping.


Which types of Balance Wheels are there? 

  • Bimetallic Balance Wheel: The bimetallic balance wheel is made of two metals with different coefficients of thermal expansion, typically brass and steel. This design compensates for changes in temperature, maintaining more consistent timekeeping.
  • Glucydur Balance Wheel: Glucydur is a type of alloy commonly used in high-quality balance wheels. It consists of beryllium, copper, and iron. Glucydur offers excellent resistance to temperature changes and is known for its stability and low friction.
  • Inertia Balance Wheel: The inertia balance wheel focuses on weight distribution for enhanced timekeeping. By adjusting the weight and distribution of mass around the wheel, watchmakers can fine-tune its performance.


Which materials are used to make Balance Wheels?

  • Stainless Steel: Stainless steel balance wheels are commonly used in watches due to their resistance to corrosion and stability.
  • Brass: Brass balance wheels are cost-effective and widely used in mid-range and entry-level mechanical watches.
  • Titanium: Titanium balance wheels are lightweight, durable, and resistant to temperature variations. They are often found in high-end luxury watches.
  • Beryllium: Beryllium alloys, such as Glucydur, are known for their excellent stability and resistance to deformation. They are commonly used in high-quality and precision timepieces.


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