讨论了用球头铣刀进行曲面加工时共振安定界限的预测方法，重点分析了法向方向角对共振安定界限的影响。

An algorithm has been developed to predict stability lobes in ball end milling to investigate the influence of normal direction angle at cutting point on the stability.

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既然在y方向上,没有加速度，法向力也等于mgcosθ

Since there is no acceleration in the y direction, the normal force must be also mg cosine theta.

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法向： 使用法向量的方向作为坐标。这在创建某些特效时非常有用（见下文）。

Nor: Uses the direction of the normal vector as coordinates. This is very useful when creating certain special effects (see below).

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