I'm preparing a panel layout drawing.  
For purposes of this post, all dimensions are in inches.
Material is 0.062 FR-4
Panel size is 12.000 X 8.500
Board size is 1.000 x 0.625, 120 boards per panel

I want to v-score these boards for "easy manual singulation" and would like
to put a note on drawing to make sure the cuts are deep enough.  Now then,

READILY AVAILABLE REFERENCES

1) Apart from IPC-2222 Table 5 general parameters there appears to be no
other official IPC publications describing preferred web thicknesses.

2a) The best Internet reference I've been able to find is here:
http://www.tkb-4u.com/articles/other/vscore/vscore.php

2b) According to the matrix within this article, for a panel 10 to 15 inches
long and individual PCB 1.0 long, I should recommend 0.010 web thickness.

3) According to the LISTSERV archives, in message 006509 back in 2001, my
old colleague Ed Valentine (now retired) recommended 0.012 web thickness for
easy manual breakaway.

CONCLUSION

So if I didn't know any better and if nobody answers this, I'd end up with a
drawing note something like this:

"V-SCORE TO FINAL WEB THICKNESS OF 0.012" +/- 0.002" USING 30 DEGREE
CUTTERS"

I'm going to call some fab folk to get their take, but meanwhile, your
assistance here is kindly appreciated.

Thanks and Best Regards,

----------------------------
Gary M. Koven, C.I.D.
Dynazign, Inc.
Charlotte, NC, USA
704.405.1234
Veteran of the Marsh School

---------------------------------------------------------------------------------
DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF DesignerCouncil.
To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL)
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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
---------------------------------------------------------------------------------