为了验证机床误差补偿系统的正确性，评定项目有三项：重复定位精度、定位精度、反向差值。
To verify the correctness of error compensation system, we have three evaluation items: repetition precision, position precision and reverse balance.
它的精度和各项性能直接影响数控机床的定位精度和重复定位精度，特别是滚珠丝杠的导程误差对机床定位精度的影响最为明显。
The precision and performance index of ball screw unit determine the positioning accuracy and the resetting accuracy of nc machines, especially its lead error.
转盘的转动及定位由伺服电机控制，本系统采用全闭环控制，定位精度高，无重复定位累积误差。
The rotation and location is under control of servo motor, the system adopts closed-loop control, so high precision for location, without repeating location accumulation error.
在对接面内与旁瓣转轴方向相垂直的方向上，重复定位误差对锁紧力位置误差最为敏感。
In the perpendicular direction to the rotation axis of the petal, the repeat position error is most sensitive to the position error of the locking force.
在对接面内与旁瓣转轴方向相垂直的方向上，重复定位误差对锁紧力位置误差最为敏感。
In the perpendicular direction to the rotation axis of the petal, the repeat position error is most sensitive to the position error of the locking force.
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