G74--数控车床代码:轴向切槽多重循环G74RG74X()Z()P()Q()F()R为间歇退刀量XZ为终点坐标P为X轴进刀量Q为Z轴间歇进刀量F为速度G74--数控铣床代码：左旋攻丝循环G74X()Y()Z()R()P()F()XY为孔坐标Z为孔深R减速点P为暂停F为速度
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