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Primary-level calibration of pitch and runout artifacts require quantifying the measurement uncertainty on the artifact being calibrated by a method that does not rely on a transfer comparison. The measurement decomposition method, developed jointly by National Institute...

New relationships for involute spur gear geometry are introduced and integrated with new methods of orclating lubricant traction and windage test data. Compact math models for lubricant density and viscosity under contact pressure are proposed. A modem...

This paper will examine use of the sound intensity measurements to calculate sound power levels of enclosed gear drives under full load. Important characteristics of the test environment will be discussed. Acoustic intensity concepts and theory will...

In many tansmission types, the lubricant fuf1ls other functions apart from lubricating the gearing, for example in friction elements (synchronizer unit, clutch) in vehicle transmissions, or as a hydraulic fluid (torque converter, retarder, steering system). The moder...

This thermal rating method balances the sum of the load-independent losses and the load-dependent losses against the heat dissipation capability of the gear case. Empirical factors are determined which calibrate the calculations against the test results for...

As the power density of gear sets increases, mesh deflections increase, and the variations in those deflections, which result primarily from mesh stiffness variation, become increasingly significant. This is because these variations translate directly into transmission error...

The PTB (Physikalisch- -Technische Bundesantalt) is able to measure (calibrate) master gears for industry traceable to national gear standards and in compliance with the Intemational System of Units (SI). For thispurpose primary gear standards and standard measuring...

This paper studies the effect of machining parameters on the performance of worm gears using a special purpose finite element technique. Algorithms are presented to determine the worm and gear geometries by simulating the grinding action of...

Powder metallurgy (P/MD) is a precision metal forming technology for producing simple or complex parts to net shape or near net shape. In most cases, litle, if any machining is required. The mechanical properties of P/M materials...