Gears. Calculation of load capacity of worm gears1 Scope This document specifies formulae for calculating the load capacity of cylindrical worm gears and covers load ratings associated with wear, pitting, worm deflection, tooth breakage and temperature. Scuffing and other failure modes are not covered by this document. The load rating and design procedures are only valid for tooth surface sliding velocities, vg, less than or equal to 25 m s and contact ratios greater than 2,1. For wear, load rating

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