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May 2006

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Subject:
From:
"Stadem, Richard D." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Mon, 8 May 2006 08:50:44 -0500
Content-Type:
text/plain
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text/plain (75 lines)
Somewhere in the fabrication rules within the IPC specs is a .050"
minimum requirement from all unfinished edges.
This is to prevent exposed copper smears during routing of the PCB.  

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jeffrey Bush
Sent: Monday, May 08, 2006 7:25 AM
To: [log in to unmask]
Subject: Re: [TN] IPC Standard

Rule was a .010" sealed edge distance - I believe this comes from a
defunct MIL Spec - but I cannot recall the document #.  Also - this is
after the processing tolerances of the Fab house - you must add these to
the .010" design rule.

Jeffrey Bush
Director, Quality Assurance and Technical Support VERMONT CIRCUITS
INCORPORATED 
           76 Technology Drive - POB 1890 
              Brattleboro, Vermont 05302
                Voice - 802.257.4571 ext 21
                    Fax - 802.257.0011
                       <http://www.vtcircuits.com/> 
                           
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor G. Hernandez
Sent: Friday, May 05, 2006 2:46 PM
To: [log in to unmask]
Subject: [TN] IPC Standard

Fellow TechNetters
   Where can I locate a related guideline of how close a copper plane
and/or trace can come to the router edge of a PWB.

Victor,

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