Hi Ted-
My $0.02:
If you located the singulation points to avoid stressing components when
separating the individual boards, and they have changed these locations,
you have a problem.
If ICT fixtures, solder paste screens, etc., have been tooled per your
original array drawing, you have a problem.
The fact that they made changes without communicating is a problem, but is
probably not insurmountable, if you are willing to change your
documentation and have their assurance that they won't do this sort of
thing again without you prior approval.
If you submit a complete drawing package with the job, they should submit a
request for change, which can be evaluated and complied with, or not, per
the merits of their request vs. your original intentions.
Happy New Year!
-Chris
P.S. The IPC guideline is just that; a guideline. Variance from it is no
problem if justified.
Ted Tontis
<[log in to unmask]> To: [log in to unmask]
Sent by: DesignerCouncil cc:
<[log in to unmask]> Subject: [DC] Assembly panels
12/29/2004 12:17 PM
Please respond to
"(Designers Council
Forum)"; Please respond to
Ted Tontis
The data package that I sent to our assembly house was in a three board
assembly panel. I used the IPC standard for choosing the size of the panel.
It was a panel 260mm x 180mm containing three boards. I talked to the
assembly house yesterday and was notified that the assembly panel size was
changed. There are still three boards in the panel, however the bare board
manufacture decreased the size of the assembly panel. First question I have
is per IPC-2221 5.2.2 Figure 5-1 I picked the correct size for the panel,
optimizing the manufacturing panel? The second question is that in my notes
"no changes where to be made to the board without first receiving written
permission of us." This now leaves me with a question mark over my head
what else was changed without me knowing it. Should I confront the Assembly
house for not following my notes? Have other designers faced similar
problems and what was your course of action?
Regards,
Ted Tontis CID
Engage Networks Inc.
1320 N. Dr. Martin Luther King Drive
River Level
Milwaukee, WI 53212
PH 414-918-4267
FX 414-273-7601
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