Abstract
Using a magnetized ball and hall elements arranged on the nut and the return tube, the authors measured the ball motion and the vibration of ball screw which incorporates resin retaining pieces between balls rotating at the shaft speed in the range of 120〜950rpm. The results were compared with not only the experimental results using the same type of normal ball screw but also the analytical results calculated based on the kinematic geometry of ball screw mechanisms. The ball motion in the ball screw became smooth by insertion of the retaining pieces and the vibration was fairly restrained. Especially, when the ball screw operated at a high speed, both the ball rotation and the ball circulation in the ball screw with retaining pieces were faster than those in the normal type without retaining pieces and the measured values well agreed with the analytical values.
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