The winding machine
According to the museum, "each cable has its own electric motor, which turns the driving sheave by means of a gear reducer. Each gear reducer contains three pairs of gears, which allow the sheave to turn at a slower speed than the motor.
The driving and idler sheaves work in conjunction to move the cable under the streets. The motor powers the driving sheave, which moves in the opposite direction from the idler sheave, which offers more surface contact for the cable, according to the museum. "As the cable loops in a figure-eight pattern, there is more friction on the cable, and the friction between the cable and sheaves allows the cable to move."
November 16, 2010 4:00 AM PST
Photo by: Daniel Terdiman/CNET
| Caption by: Daniel Terdiman
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