Okay "You're Old Fashioned".
I agree with a caveat. Pin gauge measurements are as good and probably more accurate, however, they take more time because you have to take multiple pin gauges to find the right one that fits. A good optical measurement system is much faster and works well as long as you insure it is accurately calibrated.
Regards,
George
George M. Wenger
Senior Principal Reliability / FMA Engineer
Andrew Corporation - Wireless Network Solutions
40 Technology Drive, Warren, NJ 07059
(908) 546-4531 Office (732) 309-8964 Mobile
E-mail: [log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
Sent: Friday, April 22, 2011 8:38 AM
To: [log in to unmask]
Subject: Re: [TN] hole sizes
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
[log in to unmask]
Louis Hart <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
04/21/2011 06:24 PM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Louis Hart <[log in to unmask]>
To
<[log in to unmask]>
cc
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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