Balance amplitude

Watchmakers measure amplitude to one side: 180° means that a point on the rim swings 180° to the right and 180° to the left. The red dot demonstrates this, with the degree ring below providing the scale.

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Amplitude (watchmaking convention) 270° Vibrations per hour Slow motion

Balance from the 3D model, with harmonic motion: fastest at the neutral position and slowest near each turning point. Escapement engagement in this model spans about 35° of balance angle per half-oscillation, from impulse-pin contact to drop.