火花机攻牙有二种方式，一种是锁定某个轴，XYZ任意一个轴，看你用那个轴加工，二是机床螺旋加工，前提是4轴机床，需装置C轴，如果你是单加工拧螺丝的牙就用平动加工就好，加工速度快，如果是精密螺旋斜齿那就要选用螺旋加工，

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　　一般是先打个小孔，就像手工攻牙一样，再用比小孔还小至少0.2（单边0.1）的跟目标螺纹牙距一样的小铜螺纹进行360度摇动放电，只适合较小螺纹放电操作。螺纹较大的可以像手工攻牙一样进行放电下刀，但那个火花机需要很先进，目前我只见过阿奇火花机可以这样做。