Abstract
To prevent backlash for accurate motion control, ball screw has various types of the way to apply preload, and the friction torque characteristics on each types are different. The friction torque on double nut preloaded ball screw dynamically varies after motion direction change. The friction torque after motion direction change is lower than that in the steady state. It's quite different from backlash because the preload is not absorbed and rotational motion is perfectly converted into Linear motion. This paper clarifies the difference of friction torque characteristics between double nut preloaded ball screw and over-size ball preloaded ball screw.
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