Abstract
In a machining center with an offset preloaded ball screw, the quadrant glitch has two peaks, because the friction torque fluctuates due to the changing contact points between the balls and the grooves of the ball screws. In this study, a method for compensating the two peaks of quadrant glitches is proposed. This proposed compensation method uses a new mathematical friction model to cancel the friction torque changes generated in the ball screws. It is confirmed that the proposed method can correct the two peaks of quadrant glitches in a wide feed speed range with high accuracy. In addition, in circular motions with mass, such as the workpiece, it is confirmed that the proposed method can correct the quadrant glitches without deteriorating the mass effect.
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