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Gears : Zero Backlash Gear

A Zero Backlash Gear is a specially designed to eliminate backlash, which is lost motion that is inherent in reversing mechanical connections. The typical zero backlash gear design consists of a gear split into two halves along its thickness. Each gear half is individually rotated in the opposite direction so it is in contact with the mating gear's teeth before being reattached to one another. This allows for non-binding gear meshing in either direction with zero backlash.