PCB Drilling Hole Location Accuracy and CPK
Good hole location accuracy makes the following processes easier and to some extent even makes up for weaknesses in downstream process control. But being too picky about accuracy lowers work efficiency and hurts both the company and the staff.
Published 2023-09-11 by Chengdu Jindali Technology Co., Ltd
Why CPK Is Used
CPK is the complex process capability index and it is the indicator used to evaluate modern manufacturing capability. A CPK of 1.33 or above means production capability is steady and matches the requirement. A CPK of 1.66 or above means production capability is beyond the requirement and input and output should be adjusted.
Factor One Equipment
Regular check and maintenance is necessary because it lets problems be detected and wiped out as early as possible which is vital for keeping working accuracy. This is why the maintenance schedule is treated as a quality document rather than a housekeeping list.
Factor Two Technics Parameters
Seven parameters have to be analysed together. Pile height rotation speed feed in and withdraw working life backup board material and hardness cover board material and hardness and workpiece material and hardness.
Factor Three Tool Status
Tool grinding and control pressure foot status pin situation and vacuum pressure. A machine in perfect condition will still miss the target with a worn tool or an incorrect pressure foot.
Factor Four Operator Skill
The skill level of the operators is a very important part of the whole process and is the factor most often left out of an equipment discussion.
Working Conclusion
Drilling precision is a sophisticated and highly technological process. It has to be guided by scientific reasonable precise and correct thinking rather than by feel.
