對于精密零部件來說，大連精密零部件加工是十分嚴格的，加工工序有進刀，出刀等。對于尺寸有具體要求，精度也有要求，比如1mm正負多少微米等，如果尺寸錯的太多就會成為廢品，這時就相當于得重新加工，費時費力，有時甚至會使得整個加工材料報廢，這就造成了成本的增加，同時，零件是肯定不能用了。

For precision parts, Dalian Precision Parts Processing is very strict, with machining processes such as cutting in and cutting out. There are specific requirements for size and accuracy, such as 1mm plus or minus micrometers. If there are too many errors in size, it will become a waste product, which is equivalent to reprocessing, time-consuming and laborious. Sometimes it may even cause the entire processing material to be scrapped, resulting in increased costs. At the same time, the parts are definitely unusable.