Abstract
This paper aims at establishing an accurate methodology to evaluate the friction torque of rolling bearing during the rotation of spindle. The technique adopted here basically depends upon the accurate measurement of change in the rotational spindle speed during free run by applying a reflective sensor system. The method developed here was adopted to evaluate the friction torque of angular contact ball bearing spindle under different operating conditions ; these are rotational speed, preload of bearing, amount of grease and misalignment of spindle. And it was clarified through experiments that the friction torque evaluated coincides with the measurement by torque transducer.
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