Why is precision parts processing so strict?

 

Precision parts processing is mainly standard requirements, such as how much the diameter of the cylinder is, there are serious requirements, positive and negative faults in the rule requirements planning is qualified parts, otherwise are unqualified parts; Precision parts processing length, width and height also have specific severe requirements, positive and negative faults have the same rules, such as an embedded cylinder, assuming that the diameter is too large, across the fault tolerance planning, it will constitute, can not be inserted into the situation, assuming that the practice diameter is too small, across the fault tolerance of the negative lower limit, it will constitute inserted too loose, not healthy problem.