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| Date: | Thu, 26 Oct 2006 14:21:44 +0100 |
| Content-Type: | text/plain |
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I'm curious as to why the notch was not created in the first place by
the PCB fabricator, as it appears on your drawing, it should have been
on the fabricators profile drawing too!
As the PCBA is to class 3, I would be conscious about loose fibres and
edge quality (ingress of moisture/delamination etc)which will be
dependant on the method of removal, and although you are not specific
about the removal of "surface resin" I suspect this may be accidental
damage where you are trying to take the notch out. This may have exposed
the weave of the glass, and have possible long term reliability issues.
Colin W.T. McVean M.Inst.C.T
Production Manager
Artetch Circuits Ltd
Direct Dial 01903 712926
Switch Board 01903 725365
www.artetch.co.uk
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Baine
Sent: 26 October 2006 14:06
To: [log in to unmask]
Subject: [TN] Resin removal from PCB Cutting
Hello all,
We are assembling some PCBs to a Customer Drawing. The
Drawing requires us to cut a notch at the edge of the PCB. Of
course this operation exposes the fibers, but on a few of the PCBs
we have also removed an area of resin (approx. 1.5 mm square)
from the top surface. The exposed area is well away from any
conductor and the PCB will be conformally coated after assembly.
I can't find anything in IPC-A-610 which applies to this situation.
We are building to Class 3 requirements. Is there any cause for
concern? Thanks in advance.
Best regards,
Paul Baine
Q.A. Manager
C-Tech Ltd.
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