Yea! Hi Mark! It is great to hear from you and to know that
you are continuing to chair both of these groups. Having you cover both
has been a real
blessing and the thought that someone else might have to come in just
as we were making progress was a little scary.
The
only clarification would be to number 2 - just make certain that we are
talking about internal lands and not external.
Susan
Greetings to all;
Wow! Judging by the volume of
unread messages in my email que, it looks like Susan has generated some
excellent discussion for the 600-6012 Forum! I apologize for my late
entry into the discussion, especially after so many people have provided
excellent proposals/counterproposals and clarifications to the existing Note
1 wording to IPC-6012A, Figure 3-5 and IPC-A-600F, section 3.1.1.
If
I understand the inputs correctly, these are the two differing inputs that
are being reviewed:
1. Mike Hill provided a proposal that would
add further clarification to the existing Note 1 wording found in
IPC-6012A. An improved Figure 3-5 would be needed to accurately depict
the "zigzag" or "staircase" interpretation that Mike provided. In the
case of less than perfect inner layer registration, you extend the vertical
boundary for Zone B delineation 0.08mm beyond the end of each land and
then halfway down into the dielectric spacing between that land and the next
land below it in the stack up.
2. Debora Obitz has
provided a recommended proposal that would change the IPC-6012A Note 1
wording to mirror what is currently found in IPC-A-600F. This would
result in the Zone B vertical boundary being extended 0.08mm beyond the end
of the land that extends the furthest into the laminate area.
If this
is a correct summary of what has been proposed, please let me know. I
welcome additional inputs and feedback from all members of this
forum.
I agree with Randy Reed's comments that the 600-6012
email forum is the correct means to discuss this issue as many committee
members will not be able to attend the interim meeting in Tempe or maybe not
even the IPC Expo in March.
After receiving additional feedback
regarding this issue, I think that I need John Perry's assistance in getting
the proposals into the appropriate format so that the forum can determine
which proposal goes into the updated drafts for IPC-6012B and
IPC-A-600G.
Thanks for your inputs / feedback regarding this
topic.
Mark Buechner
Chairperson for 7-31a and D-33a Task
Groups
Currently unemployed
Home phone (603)
595-0075
email:
[log in to unmask]
***For those of you who were not aware, I was
notified the week after returning from the IPC annual meeting in New Orleans
that I was included on Teradyne's most recent layoff list.
I informed John Perry at the time that I intended to continue on as the
Chairperson for both the IPC-6012 and IPC-A-600 committees during my job
search. If I do not land a future position within the electronics
industry, I will let John know immediately, so that he can begin the search
for a
replacement.