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Scoring of planet carrier.

The edge of the planet gears rubs the carrier where arcs are marked at the diameter of the planet gear. The planet carrier is scored circumferentially, presumably to allow lubricant to flow into the interface between the carrier and the planet gears. As the edges of the planet gear teeth slide over the scoring, the gearbox makes noise.

2009/03/17 18:20:03

Exposure mode: program (auto)
Metering Mode: matrix
Exposure time: 0.0063 s (1/160)
Aperture: f/2.8
Focal length: 8.0mm (35mm equivalent: 37mm)
ISO: 800
Flash: No
File size: 2028086 bytes
Camera maker: FUJIFILM
Camera model: FinePix F10
Resolution: 2848 x 1894