2.2.1 Machinability of workpiece materials,2.2.2 Cutting fluid,2.2.3 Selection of the geometric parameters of cutting tool,2.2.4 Determination of cutting parameters,2.2 Application of the basic rules in metal cutting,2.2.1.1 Main indices to measure the machinability （1） Index related to Tool life,2.2.1 Machinability of workpiece materials,For cutting plain metal materials, the value of allowable cutting speed v60 when the tool life is 60 minutes, is taken as the judgement index,Usually, v060 is
