图示是两张诺模图,是以标准刀具寿命方程式为基础而建立的。可以快速估算刀具的寿命或切削速度。要建立最佳加工条件,机加工人员必须要有一个刀具寿命的概念。对于这一点,可以用标准的刀具寿命方程式进行计算:VT~n=C式中:V——切削速度(米/分);T——刀具寿命(分);n——方程式的斜率;C——常数。n值可以由下列方程式确定: The illustration is a two-part nomogram based on a standard tool life equation. You can quickly estimate the tool life or cutting speed. To create the best machining conditions, the machinist must have a concept of tool life. For this it is possible to calculate with the standard tool life equation: VT ~ n = C where: V - cutting speed in meters per minute; T - tool life in minutes; n - slope of the equation; C --constant. The value of n can be determined by the following equation: