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Backlash can be defined as a rotational arc clearance formed between a pair of mounted gears. A backlash (clearance) is crucial to any Gear set for checking the damages caused by the gear tooth interference. Lack of backlash causes the following problems: * Noise * Overloading * Overheating of gears and bearings * Seizing and failure Backlash amount gets measured by limiting the rotation of one member, that generally is the pinion, while measuring the other component's rotational movement at a reference radius. Backlash is usually defined in arc degrees (min/sec). The arc movement measurement thus obtained is converted to degrees by applying the following equation:

Backlash (degrees) = Arc Movement (inches) x 57.296/Radius (inches)

The following table gives the American Gear Manufacturer's Association specified Backlash range for Coarse pitch Spur, Helical and Herringbone type of gears.

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Q: What is gear backlash?
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