该方法和装置具有对误差源，即，重力、内部摩擦力和操作者干涉(不稳固地保持仪器)而言减小的灵敏度。

The method and apparatus have a reduced sensitivity to error sources, i. e. gravity, internal friction and operator interference (unsteady holding of the instrument).

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能使操作者及时发现工件加工中存在的误差，并反馈给数控系统，以改变机床的运动参数，更好地保证加工质量。

It can enable the operator to find the error during part machining and feedback the error to the CNC system to alter motion parameter to ensure the machining quality.

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