也还存在其它一些变量影响表面切削速度的最佳值。
There are also other variables that affect the optimal value of the surface cutting speed.
为了保证加工表面质量，数控车床一般都具有恒表面切削速度控制功能。
In order to guarantee the machining surface quality, numerical control lathe generally has constant surface cutting speed control function.
切削速度只有在对表面粗糙度不做要求的时候才不重要。
Cutting speed only in the surface roughness not required when it is not important.
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