Hi Louis - we have set up  a couple of microscopes to accurately measure 
plated thru hole sizes so that method is acceptable provided you have 
utilized correct calibration/setup techniques (there is lots of software 
available to assist with this task). However - call me old fashioned but I 
think using pin gauges is just as good a method and it can be a faster 
measurement method. Unless there is some critical issue, we tend to use 
pin gauges as our first measurement method.

Dave Hillman
Rockwell Collins
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Louis Hart <[log in to unmask]> 
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[TN] hole sizes






Technetters, here is a real question, to replace the spurious one I just 
posted by mistake.

May I have some comments on measurement of hole sizes in printed circuit 
boards? For many years, I have  been using plug/pin gauges to check hole 
sizes. I recently noticed that the IPC test method 2.2.7 called for use of 
a microscope. My opinion is that the plug gauges are fine, and, if 
anything, better than a microscope, even a good 20X device. A small 
measurement quality study we did on some 40-100 x microscopes a while back 
suggested the error in using them is greater than the tolerance of a plug 
gage. But I don't want to get in trouble for using a non-recognized test 
method. Thanks for any comments.

Louis Hart
Compunetics
Monroeville, PA
USA
[log in to unmask]<mailto:[log in to unmask]>
412-858-1272

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