Grandfather Clock

A swinging pendulum regulates a gear train visible behind the glass door, while the face hands tick in true real time. Mechanically, the pendulum's period sets the escapement rate that the gear train converts into steady rotational motion for the hands.

• 4-gear train with mixed ratios (10-24 teeth) driven off the pendulum rhythm
• Pendulum swings with simple harmonic motion, amplitude 0.35 rad
• Second/minute/hour hands driven by actual elapsed wall-clock time
• Procedural involute-style gear teeth via ExtrudeGeometry