Matt,

I would be more conservative with the placement of the larger size
capacitors, and keep them significantly further from the edge. It doesn't
take much stress to induce internal fractures.

Thanks,
Robert Furrow
Printed Wiring Board Engineer
Strategic Supply Global Account Manager
Supply Chain Networks
Lucent Technologies
978-960-3224    [log in to unmask]

> -----Original Message-----
> From: Matt Sanders [SMTP:[log in to unmask]]
> Sent: Wednesday, March 14, 2001 10:11 PM
> To:   [log in to unmask]
> Subject:      [TN] v-groove (score and break) depanelization
>
> Hello,
>
> I searched through the archives, but couldn't find much in the way of
> specifics (although a few good summaries of positives and negatives of the
> processes). We're looking to use score and break depanelization on a new
> product, and I was interested in finding out what design rules people are
> using.
>
> Our CEM tells us .040" from board edge to component body and .020" to
> traces
> or pads when we use a "pizza cutter" type depanelization machine as this
> process doesn't cause too much stress on the board. Is this consistent
> with
> what others have used, and have the results been successful? Is this
> "pizza
> cutter" a standard tool that assembly shops have?
>
> What rules are used when just hand breaking the boards with a v-groove.
> How
> about with a breakaway tab ("mouse bite")?
>
> My main concern is not inducing any excess stress on the board or cracking
> any components/joints.
>
> Thanks for the assistance!
> Matt
>
> ~~~~~
> Matt Sanders - Trimble Navigation, Component Technologies
> [log in to unmask] <mailto:[log in to unmask]>
> Phone: 408.481.7965
> Fax: 408.481.2202
> Pager: 408.619.3899
>
> --------------------------------------------------------------------------
> -------
> Technet 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 Technet
> To temporarily halt delivery of Technet send the following message: SET
> Technet NOMAIL
> Search previous postings at: www.ipc.org > On-Line Resources & Databases >
> E-mail 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
> --------------------------------------------------------------------------
> -------

---------------------------------------------------------------------------------
Technet 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 Technet
To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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
---------------------------------------------------------------------------------