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April 2011

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Subject:
From:
Chris Mahanna <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Chris Mahanna <[log in to unmask]>
Date:
Mon, 25 Apr 2011 10:04:23 -0400
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Louis,

The trouble is that they two techniques don't measure the same thing.  Pin gauges measure "maximum inscribed diameter".  AOI software sometimes has a feature to calculate such an animal, but it will only be at the surface.

What QA routine are you working against?

Chris

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Louis Hart
Sent: Thursday, April 21, 2011 7:25 PM
To: [log in to unmask]
Subject: [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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