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January 2007

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Subject:
From:
Dharma Kemp-Bresett <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Dharma Kemp-Bresett <[log in to unmask]>
Date:
Wed, 24 Jan 2007 14:24:18 -0500
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Hi All,
I received a call from one of my customers today on a subject I do not have
the answer for. I also do not have access to any of the IPC standards that
would have the answer to this question, as I am part of a design services
bureau and not a fabricator or assembler. I was hoping that one of the more
knowledgeable (than I) members on this forum would be able to give me some
sort of guidelines, even just a general one, if possible. 
The question is as follows:

"I'm trying to find out what the maximum recommended compression force would
be for bolting a circuit board to a metal bar, for the purpose of making a
70 amp electrical connection.  My concern is not damaging the board (an 8
layer board, in this case), and not causing  the TG170 FR4 material to flow
out from underneath the bolt and washer.  I realize that the answer may
depend on the total thickness of FR4 material and the total thickness of
copper in the stackup....."

I have already done some poking around in the archives but have not come
across the answer, as of yet. Therefore, I defer to the expansive knowledge
of those on this forum......
Thanks in advance,
Dharma


KAW/USA Ltd. 
39 Simon Street, #4 
Nashua, NH 03060 
603-886-8711 x212 
603-881-8763 fax 

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