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December 2011

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Subject:
From:
Steven Creswick <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Steven Creswick <[log in to unmask]>
Date:
Wed, 21 Dec 2011 08:48:39 -0500
Content-Type:
text/plain
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text/plain (81 lines)
Shawn,

The tech would have been better to clarify his response by, "Yes, I can
solder it if I absolutely have to, but others, with less skill, will have
difficulty and result in added rework.  From a Manufacturability standpoint,
this is not desired."  

This would have preserved his apparent skills, but would have also provided
valuable manufacturing insight.

The tech needs to know that he has a ally in the design department to whom
he can bring suggestions.

It is similar to, "I can do anything once, but that does not necessarily
make it 'manufacturable' "

Steve C

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Upton, Shawn
Sent: Wednesday, December 21, 2011 8:37 AM
To: [log in to unmask]
Subject: Re: [TN] QFP center slug over signal vias

The problem is that everyone wants to see it just from their vantage point.
It is much work to see it from anyone else's viewpoint, let alone attempt to
see a multitude of viewers.  It certainly helps to have to sit in someone
else's seat for a bit.

Another part of the problem is "push and take".  On a recent project I was
told to use two SMT connectors (that would receive edge fingers, so they
were rather tall).  I took one look at the spacing between them and said
nope--not for our hand-assembled boards.  A soldering tech was then asked if
he could solder it.  Yes he said.  I put my foot down and went through-hole
anyhow.  Later on the tech thanked me that he wouldn't be seeing those two
closed-spaced SMT connectors.  Thing is, he could have soldered it, with
much work, push come to shove.  After all, on his end, by the time he gets a
board it's too late to change the design--so he might as well claim to be
able to solder anything.

Shawn Upton, KB1CKT
Test Engineer
Allegro MicroSystems, Inc
[log in to unmask]
603.626.2429/fax: 603.641.5336


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