It is also noted that the percentage of complex pulse increases monotonically with the depth of drilling.It starts to drop when the gap condition is deteriorated that drilling is no longer possible.

• 随著微细深孔加工深度渐增，复合波所佔波列之百分比重逐渐上升，而极间状况恶化时，复合波百分比停止上升而开始下降，其后加工程序即无法继续进行。