TECHNET Archives

August 2002

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Earl Moon <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Sat, 10 Aug 2002 10:51:18 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (50 lines)
Karl,

I see where your comittee is going now. Realy don't understand, but wish to,
benefit to those like myself in the lowest of places where designers
struggle while attempting just to effect DFM/CE for "normal" boards.

I just finished readin on paper on CAF. It pointed to all you say with
respect to X/Y axis issues. It also pointed to Z axis problems that may
exist between, of course, two planes using a single ply of preg.

I have reviewed, almost everyday JIPC/IPC 2315 and can envision issues here
with CAF. However, in my wildest dreams, could I have cooked up the
omnipotent schemes, indicated in that guideline, regarding so many
variations as micro vias, buried vias, buried micro vias, very high aspect
ration interfacial vias, and multiple combinations thereof.

I'm really not carping about all this. I'm just wanting to get back to
normal 20 or 50 layer boards that have been around for many years without
regard to needing anything like CAF.

Just one other thing: There is talk of issues with hollow glass fibers. I'm
really missing something as these fibers are but 7-9 microns in diameter.
How can they be hollow or, even if they were how could they possibly affect CAF?

Oh heck, one other thing: I have admonished all those using resin poor glass
styles for years. Haven't we gotten past this stage. Most of my "relatively"
dense designs don't even allow 2116 glass styles. Is anyone really doing
four layer boards that are in any way interested in CAF

Just trying to broaden my horizons a bit while offering some considerable
years of experience doing this stuff at the "street" level. I realize the
difference, now, between cleanliness and CAF. However, the gap is much too
narrow for me to feel comfortable with what you all are doing by separating
the two.

Highest regards,

MoonMan

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------

ATOM RSS1 RSS2