Center distance
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Center distance (operating) is the shortest distance between non-intersecting axes. It is measured along the mutual perpendicular to the axes, called the line of centers. It applies to spur gears, parallel axis or crossed axis helical gears, and wormgearing.1
[edit] Notes
1. ANSI/AGMA 1012-G05, "Gear Nomenclature, Definition of Terms with Symbols".

