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August 2007

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Subject:
From:
Phil Nutting <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Phil Nutting <[log in to unmask]>
Date:
Thu, 16 Aug 2007 07:52:57 -0400
Content-Type:
text/plain
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text/plain (212 lines)
I guess this rules out Bazooka Bubble Gum.  

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey
(EHCOE)
Sent: Wednesday, August 15, 2007 5:21 PM
To: [log in to unmask]
Subject: Re: [TN] Drill Rework

I don't mean to sound holier than thou, but I don't like partial depth
drilling to cut traces and I don't advise filling a whole that is not
the sum of its parts. If this part went into John Burke's Refrigerator,
no one would care because the English like warm Beer anyway. However, if
there is integrity required or long term reliability, I would do
additional testing/cleaning of the hole before I applied a well
engineered epoxy with a structured process. Things to consider are as
follows:

*         Verify TCE compliancy with FR4 substrate

*         Verify ability to seal to prevent moisture/contamination
ingression

*         Verify the by-products of the cure are not a potential
contaminant

*         Verify the by-products of the cure are not potentially
corrosive

*         Verify the by-products of the cure are not a growth medium

*         Verify the by-products of the cure are not conducive to
forming an electrical migration path

*         Verify bullets 3 through 6 are still acceptable in the
presence of humidity and a DC bias voltage

*         Verify that the adhesive and it's by-products do no outgas

*         Verify there are no amines in the formulation

*         Verify that the adhesive does not create any occupational
hazards

 

Dewey

 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tony Steinke
Sent: Wednesday, August 15, 2007 2:28 PM
To: [log in to unmask]
Subject: Re: [TN] Drill Rework

 

Kerry,

A two part epoxy by 3M followed up with a 200F bake to fully cure should
be

fine.

 

Tony Steinke

 

-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of Kerry McMullen

Sent: Wednesday, August 15, 2007 2:28 PM

To: [log in to unmask]

Subject: [TN] Drill Rework

 

Hi,

I have a .062 FR406 board where I need to drill out a trace that is 

causing a problem.   The trace is .020" down in the board (Layer 4).
The 

drill size is .012.

After I have drilled out (opened) the trace, what do you suggest I fill 

the drill hole with? 

We have done the rework, and it works fine.  I am just curious as to if
I 

should fill the hole with epoxy.

 

Thanks in advance,

Kerry 

 

 Kerry McMullen

Principal New Product Mfg. Engineer

LTX Corporation

825 University Avenue

Norwood, MA 02062-2643

(T) 781-467-5468

(C) 508-631-1832

(F) 781-461-0993

 

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