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.
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.
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.
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.
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.
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.
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.
Machines Covered in This Guide
D2X PCB Drilling Machine
Independent Z axis structure on XYZ ball screw drive. The independent Z axis holds the vertical accuracy of the machine and improves th...
D3X PCB Drilling Machine
XYZ axis linear motor drive with high precision linear scale and guide. The fastest configuration in the DLCNC drilling range.
D4X PCB Drilling Machine
Linear motor drive with high precision linear scale and guide on a granite marble base frame. The D4X is the volume drilling configurat...
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Questions On This Guide
What CPK should a PCB drilling process hold
1.33 or above indicates steady capability that matches the requirement. Above 1.66 the capability exceeds the requirement and the input and output should be adjusted.
Is a more accurate machine always the answer
No. Equipment is only the first of four factor groups. Technics parameters tool status and operator skill all have to be controlled for the machine accuracy to reach the product.
Which parameters should be checked first when accuracy drifts
Start with the equipment check then review the seven technics parameters then the tool status and finally the operator method.
Have a Question This Guide Did Not Answer
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