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July 2008

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Subject:
From:
Ken Bloomquist <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Ken Bloomquist <[log in to unmask]>
Date:
Mon, 7 Jul 2008 15:56:54 -0700
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Hi Werner,

I like your thinking but... 

I'm not in the quality department, no offense to those of you who are, but I
wouldn't want to be ;-) But thinking like an inspector, how would you verify
that you got the right size holes if you don't call out a finished hole
size? I guess you could do a cross section but a pin gage is a lot simpler.

Just thinking out loud,

KennyB

-----Original Message-----
From: Werner Engelmaier /* [mailto:[log in to unmask]] 
Sent: Monday, July 07, 2008 3:36 PM
To: [log in to unmask]
Subject: Re: [TN] Flex specifications - tolerance on hole size

Hi Graham,
Why do you care what the finished hole size is? Do you put component leads 
into 0.028"/+- 0.003" holes, that is 25 mils minimum?
The finished hole size specifications are an anachronism harking back to the

THT-days-today they only should be specified for componet lead holes. For
vias 
the drilled hole diameter should be specified-it is much more important.
Werner
Future workshops:
Pb-Free Soldering Processes-Survival, Quality, Reliability, July 17/18,
Thal, 
Switzerland
Pb-Free Soldering Processes-Survival, Quality, Reliability, July 21/22, Bad 
Segeberg, Germany
Pb-Free Soldering Processes-Survival, Quality, Reliability, August 18, 
Orlando
Reliability Issues with Lead-Free Soldering Processes, September 22, 
Schaumburg
Failure Mode and Root Cause Analyses Reliability (Fatigue, Brittle Fracture,

ENIG), September 22, Schaumburg
Solder Joint Reliability: Parts 1 & 4, Oct. 9, Moscow, Russia
Solder Joint Reliability: Parts 1 & 4, Oct. 17, Timisoara, Rumania
Solder Joint Reliability: Parts 1 & 4, Oct. 22, Tallinn, Estonia

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