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The method ofcutting teeth on a cylindrical gear by the hobbing process has been in existence since the late 1 800’s. Advances have been made over the years in both the machines and the cutting tools used...

It may not be widely recognized, that most of the inspection data supplied by inspection equipment following the practices ofAGMAStandard 201 5 and similar standards, are not ofElemental accuracy deviations but of some form of Composite deviations....

As well known in involute gearing, perfect involute gears never work perfectly in real world. Flank modifications are often made to overcome the influences oferrors coming from manufacturing and assembly processes as well as deflections ofthe system....

The total stresses in amating gearpairarise from two sources: 1 ) externallyinduced stresses associated with the transmission of power, and 2) residual stresses associated with the heat treatment and machining of the tooth profiles. The stresses due...

Asingle tooth bending (STB) test procedure has been developed to optimally map the AgustaWestland gear design parameters and a test program on case carburized, aerospace standard gears, has been conceived and performed in orderto appreciate the influence...

One of the most common failure mechanism of highly stressed case carburized gears is micropitting (gray staining). ,, The standard FZG gear test (FVA Work Sheet 54) is generally used to determine the micropitting load capacity of...

When gears are case--hardened it is known that some growth and redistribution of stresses will occur which result in geometric distortion. Aerospace gears require post case--hardening grinding of the gear teeth to achieve necessary accuracy. Tempering of...

Traditionally, gear rating procedures on directly consider manufacturing accuracy in the application of the dynamic factor, but only indirectly through the load distribution consider such errors in the calculation of stresses used in the durability and gear...

Non--uniform gear wear changes gear topology and affects the noise performance of a hypoid gear set. The aggregate results under certain vehicle driving conditions could potentially result in unacceptable vehicle noise performance in a short period of...

For several years predictive maintenance has been gaining popularity as a method for preventing costly and time--consuming machine breakdowns. Vibration analysis is the cornerstone of predictive maintenance programs, and theequationsforcalculating expected vibration frequenciesforbearingsand toothed gearsets are widely...