My bad, section 3.6.2.6 not 3.6.2.1
Sorry
Scott
From: Bowles, Scott @ SSG - PE - FOS
Sent: Thursday, February 28, 2013 10:01 AM
To: (Combined Forum of D-33a and 7-31a Subcommittees)
Subject: RE: [IPC-600-6012] Wicking Measurement
Matt and others are correct in that the specification shows in Figure
3-11 it is the aggregate of etchback and wicking. With that said,
section 3.6.2.1, second paragraph, states:
The sum of maximum "allowable" etchback .00315" plus the sum of the
maximum "allowable" wicking .00315" allows for a maximum "dielectric
removal" of .0063" measured from the edge of the drilled hole which
would be the end of the interconnect post. With that said, I interpret
that etchback and wicking should be measured separately and agree with
Joey that I would measure etchback first and from where it ends I would
start my measurement for wicking which cannot be more than .00315" past
where the positive etchback ends.
Don also makes a valid point regarding where nonfunctional pads have
been removed and the wicking is on the same plane or if you have donut
pads with a clearance to a plane layer, you cannot violate the minimum
spacing requirement. For example if you have a plane layer with a
minimum spacing of .005" between the edge of a nonfunctional pad and the
plane (and your drawing specifies minimum spacing at .005"), if due to
the pad size and misregistration you have .002" minimum annular ring
which is good, you cannot as I understand the requirement have wicking
past the end of the pad or you will violate the minimum spacing
requirement between the copper plating and the plane layer.
I hope my explanations make sense.
Regards,
Scott A. Bowles
Staff Engineer - Printed Circuit Designer IV
Engineering Services
L3 Fuzing & Ordnance Systems
3975 McMann Rd.
Cincinnati, OH 45245
Office: 513-943-2483
Mobile: 513-208-9009
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-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Byrne,
Matthew J (US SSA)
Sent: Thursday, February 28, 2013 8:12 AM
To: [log in to unmask]
Subject: Re: [IPC-600-6012] Wicking Measurement
Like Jim said, it's the aggregate per figure 3-11, attached.
Matt Byrne
607-953-9820
BAE Systems Controls Inc.
Huron Campus, Building 257
1098 Clark Street, Endicott, NY 13760
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-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]
<mailto:[log in to unmask]> ] On Behalf Of Russ Shepherd
Sent: Wednesday, February 27, 2013 5:56 PM
To: [log in to unmask] <mailto:[log in to unmask]>
Subject: [IPC-600-6012] Wicking Measurement
Question for the group.
At what points would you put the start and end of a wicking measurement
on the attached photo?
(the vertical scratch has nothing to do with where I would measure)
[cid:[log in to unmask]]
Sincerely,
Russ Shepherd
Laboratory Director
MICROTEK LABORATORIES
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Fax : +1 (714) 999-1636
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