Gears are toothed wheels used for transmission of rotary motion from one shaft to another. There are different types of gears including spur, helical, bevel and worm gears. Proper lubricants are required, depending on the type of gear and operating parameters to prevent the many possible types of failure modes which include surface fatigue, scoring, pitting, scuffing, abrasion, corrosive wear and tooth breakage.

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