The units painted on the dial of a scale are often mass units, not force units.

秤的刻度盘上所标单位是质量的单位，而不是力的单位。

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Since the parts' stiffness and precision of the spindle units are quit high, and the loads are usually not heavy, so the machining error caused by the cutting force is small.

在高速切削机床中，由于主轴单元系统各零件刚度和精度都较高，而负荷却不是很大，主轴因切削力引起的加工误差较小。

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The force unevenness between two driving units of the interface module is so small that force feedback control technique is not needed.

该冗余驱动接口模块刚度好，且其中各驱动单元间的力均衡误差小，可避免使用成本高、算法复杂的力反馈控制技术。

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