Of course -- just interesting that the fibre was sheared so far back
fairly cleanly -- this microsection section is not ground to the centre
of the hole though, so the degree of wicking (and apparent plating
thickness) is distorted.  Ian

-----Original Message-----
From: Stadem, Richard D. [mailto:[log in to unmask]] 
Sent: Monday, October 01, 2007 2:15 PM
To: TechNet E-Mail Forum; Ian Hanna
Subject: RE: [TN] Is This a BAD Thing?

If the drill process is not robust enough (sharp drill/clear lase) a
small resin or glass recession or tear will occur, and this in turn will
be plated up, resulting in the plated spur. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ian Hanna
Sent: Monday, October 01, 2007 1:16 PM
To: [log in to unmask]
Subject: Re: [TN] Is This a BAD Thing?

Assuming the design has a sufficient 'anti-pad' clearance on the plane
layers spacing to adjacent conductors should not be an issue.  Class III
allows .003" maximum.  Unusual though that the glass is sheared so far
back.  There is some indication of drill tear-out though.  I wonder if
the mystery material between layers 4 and 5 has anything to do with
this?  Ian
 

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0 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/contentpage.asp?Pageid=4.3.16 for
additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------