I've never heard anyone dispute the advice of Accusystems.
Without trying to find the archive from 2001, I would guess
Ed was generalizing for a "typical" board size when he said
.012 Your boards are rather small compared to most.
by the way,
That link is an older version of the article.
It has been expanded since then.
Here is the site of the original authors:
http://www.accusystemscorp.com/FAQ's%20-%20Index.htm
good luck,
Jack
On 8/16/07, Tempea, Ioan <[log in to unmask]> wrote:
>
> Matt,
>
> maybe you'll be luckier trying to print it from here
> http://www.vscore.biz/vsguide.html
>
> Regards,
>
> Ioan
>
> -----Original Message-----
> From: DesignerCouncil [mailto:[log in to unmask]]On Behalf Of
> Matthew Lamkin
> Sent: Thursday, August 16, 2007 12:22 PM
> To: [log in to unmask]
> Subject: Re: [DC] V-scoring and web thickness
>
>
> Cant help other than to say scoring has often been one of those "suck it &
> see" things because
> it's been done on 20 year old equipment & set-up by the rack of t'eye etc.
> But that article looks interesting, can anyone recommend how I'd go about
> printing it out & still
> keeping all the text within it?
>
> Even Fire fox is cutting the Rh edge off.
>
> Thank you,
> Matthew Lamkin
>
> -----Original Message-----
> From: DesignerCouncil [mailto:[log in to unmask]]On Behalf Of Gary
> M. Koven
> Sent: 16 August 2007 17:05
> To: [log in to unmask]
> Subject: [DC] V-scoring and web thickness
>
>
> 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=4.3.16for additional information, or contact Keach Sasamori at
> [log in to unmask] or 847-615-7100 ext.2815
>
> ---------------------------------------------------------------------------------
>
>
>
> ----------------------------------------------------------------------------------------------------------------------------------------------------
> This email, its content and any files transmitted with it are intended
> solely for the addressee(s) and may be legally privileged and/or
> confidential. If you are not the intended recipient please delete and
> contact the sender on the telephone number +44-(0)1282-717171 or via email
> return. Unless expressly stated otherwise, and subject to the disclaimer
> below, this email does not form part of a legally binding contract or
> agreement between the recipient and Protec Fire Detection Plc. (registered
> no. 1170489). Registered Office: Churchill Way. Nelson. BB9 6RT. Lancashire.
> United Kingdom.
> Messages sent via this medium may be subject to delays, non-delivery and
> unauthorised alteration. This email has been prepared using information
> believed by the author to be reliable and accurate, but Protec Fire
> Detection Plc. makes no warranty as to accuracy or completeness. In
> particular, Protec Fire Detection Plc. does not accept responsibility for
> changes made to this email after it was sent. Any opinions or
> recommendations expressed herein are solely those of the author.
>
> ----------------------------------------------------------------------------------------------------------------------------------------------------
>
>
> ---------------------------------------------------------------------------------
> 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=4.3.16for additional information, or contact Keach Sasamori at
> [log in to unmask] or 847-615-7100 ext.2815
>
> ---------------------------------------------------------------------------------
>
>
> ---------------------------------------------------------------------------------
> 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=4.3.16for additional information, or contact Keach Sasamori at
> [log in to unmask] or 847-615-7100 ext.2815
>
> ---------------------------------------------------------------------------------
>
---------------------------------------------------------------------------------
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
---------------------------------------------------------------------------------
|
