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When Continuous high pressure force act on the surface of the gear teeth Pitting occurs.
Pitting in turn causes the gear Failures like Scoring.
Scoring can be identified by the radial scratch lines.

All other operation scoring occurs due to incorrect accuracy of the mating gears.It happens without pitting.

In high speed operation like aerospace gears the Gear scoring happens due to the vaporization of oil film and welding occurs between the gear tooth to form the Scoring

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Q: What is scoring in metal gears?
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