在加工端面、圆弧、圆锥以及蹊径直径相差较大的零件时，沿X轴方向进给时，固然进给速度不变，但切削线速度却不断地变化，导致加工表面质量变化。

In the end, arc, processing and ground is large diameter conical parts, along the X axis into to, is the same, but the linear cutting speed is constantly changing, the cutting surface quality changes.

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