How to evaluate Holle Registration Accuracy in PCB drill

2018-11-26 16:21Writer: qyadminReading:
For the hole registration accuracy evaluation, the displacement of the drilled hole from the target is measured.All holes are measured using a PWB hole tester (AOI machine).All the holes are measured for each drill bit used.The exit side of the bottom panel is measured for the hole registration accuracy when stack drilling is carried out.The centroid method, shown below, is used.The measurement data is analyzed by "Maximum displacement (Max)", "Average value + 3s, (Ave+3s)", and "Cpk value", etc.In "Average value + 3s", "s" means standard deviation value.Centroid MethodTo counterbalance the amount of displacement caused by external factors of the drilling machine's registration accuracy, the center of the data group of the displaced drilled holes is set to origin (0,0) as shown in the figure below. The evaluation is carried out using the centroid method.L:The center displacement of the group data due to external factors.

  
How to evaluate Holle Registration Accuracy in PCB drill
  Raw Data Hole Distribution Chart


How to evaluate Holle Registration Accuracy in PCB drill
  Centroid Data Hole Distribution Chart


      Related articles
   
How to Evaluate Nail Heading in PCB drill
 
What is Wicking and how to test it
 
Compare burrs on market PCB with burrs of our company PCB
 
What is the correct resin smearing method
 
Compare Large bird nesting with Small bird nesting

The influence of increasing drilling frequency on drill wearing
   
Three standard PCB tools evaluation
pcb backup board
pcb backup board pcb backup board