当进给速度不恒定时，会造成许多问题。
When the velocity (feed rate) is not constant, several problems can result.
进给速度对钻削力的影响最为明显。
The effect of the feedrate to drilling force is the most significant.
切削用量三要素包括切削速度、进给量和（或叫吃刀量）。
Thee three factors of cutting include cutting speed, feed and the depth of cut.
提高切削速度，降低进给量。
提高切削速度，降低进给量。
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