Bill,

Here's a picture of a board that had 14-oz copper layers on layers 2 and
11 that I had to use the airbath on to rework PTH components:

 http://www.stevezeva.homestead.com/HeavyMetal2.jpg

-Steve Gregory-

-----Original Message-----
From: Steve Gregory 
Sent: Thursday, January 25, 2007 2:23 PM
To: 'TechNet E-Mail Forum'; 'Bill Dworak'
Subject: RE: [TN] Assemble question

Hi Bill!

You need to pre-heat the boards. If they are hand soldering them, one of
the pre-heat units that I've used in the past with very good results is
from Zephyrtronics...in fact unless I used it, there was no way I could
accomplish what I was trying to do. Take a look at:

 http://www.zeph.com/airbathseries.htm

-Steve Gregory-

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bill Dworak
Sent: Thursday, January 25, 2007 2:01 PM
To: [log in to unmask]
Subject: [TN] Assemble question

I am in need of some help with regards to assemble. I am a PCB
manufacture and have built a group of boards for one of my accounts and
they are having issues assembling and have asked me for help on the
issues they are having.  
 The product is 4 layer board power and ground planes with 2 OZ copper
inner layers the outer layers are 5 OZ copper. What is happening is that
because of the construction of the board it is acting like a big heat
sink and this is where the problems are coming from. These are old
through hole designs they are assembling them by hand they are heating
the irons way up causing surface issues on the boards and in some cases
lifting of pads is resulting when extreme heat is applied they are
heating them up a lot because of all the copper and as I am being told
the solder is not melting the way that it should. 
 Any suggestions to make this a smooth build ? 
 Thank you. 

Bill Dworak













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