Abstract
The error of friction coefficient determination with Amsler-type machines depends strongly on the friction losses in the machine’s spindle unit. It is shown theoretically that the error is inversely proportional to the product of the lower roller diameter times the friction coefficient to be measured and directly proportional to the friction coefficient of the rolling bearings employed; the error can reach 100% or more. A method of static and dynamic torque sensor calibration is developed to ensure friction coefficient measurement accuracy within ±2%.
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