So the object goes down, the velocity changes and when it is at position minus one it has come to a grinding halt and now it is returning.

因此物体向下运动时，速度是变化的,当它到达位置-1时,会猛的停下,然后返回。

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The grinding principle of crankshaft journal is introduced, the formation reason of position error is analyzed in detail, and the corresponding measures are proposed as well.

介绍了曲轴连杆轴颈磨削的原理，对其常见的位置误差现象的形成原因进行了分析，并提出了相应对策和办法。

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Finally, the position of the ultrahigh speed wheels in ultrahigh speed grinding and our research direction in future are pointed out.

最后，指出超高速磨削砂轮在超高速磨削中的地位，并指出努力方向。

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