Non-contact measurement of spindle stiffness by using magnetic loading device

摘要

The radial stiffness of a rotating spindle is investigated in this research. A magnetic loading device (magnet loader) that attracts a dummy tool attached to the spindle is developed for this investigation. The dummy tool is designed so that the eddy current generated at higher rotational speed is suppressed. The spindle stiffness was measured with the developed device and compared with the calculated value. From the measurement results, speed and thermal effects on the stiffness were clarified quantitatively.