hi! How are you ?
----- Original Message -----
From: "John Burke" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, May 09, 2006 7:44 AM
Subject: (瑞星æ示-æ¤é‚®ä»¶å¯èƒ½æ˜¯åžƒåœ¾é‚®ä»¶)Re: [TN] IPC Standard / PWB Router edge clearance
> Yes it will.
>
> The interesting thing that I note is that no-one has commented on this from
> a CAF growth standpoint.
>
> For 48 volt internal planes I have been advised that 3 mils drill to copper
> is a good bet. If you only had 10 mils at the rout edge to copper on a slide
> in card such as an internet switch blade, you would effectively have 10 mils
> copper (internal) to ground (on the card guide external).
>
> Telecomms guys on the link what is your dimension for this?
>
> John
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor G. Hernandez
> Sent: Monday, May 08, 2006 1:46 PM
> To: [log in to unmask]
> Subject: Re: [TN] IPC Standard / PWB Router edge clearance
>
> Now the ball is rolling on this topic. This is what I wanted to hear
> on the different guidelines out there besides IPC STD. I will continue
> too solicit thoughts on this topic. I feel that it is critical and
> eventually cause failures on card .
>
> Victor,
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey
> (AZ75)
> Sent: Monday, May 08, 2006 3:14 PM
> To: [log in to unmask]
> Subject: Re: [TN] IPC Standard
>
> Yes and the conservative Aerospace approach added another .015 for all
> uses and routing-out( de-panelizing ) required a .015 profile tolerance
> so you ended up with an .040 design keep-out area from edge of PCB to
> any conductive edge.
> Dewey
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Jeffrey Bush
> Sent: Monday, May 08, 2006 12:39 PM
> To: [log in to unmask]
> Subject: Re: [TN] IPC Standard
>
> MSFC-STD-154 paragraph 5.1.1.3 - minimum edge clearance of conductors
> shall be .010". Just for trivia.
>
> MIL-STD-275 did call a .050" minimum or the use of a table based on
> voltage where inner and outer conductors have different criteria.
>
> 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 Stadem, Richard D.
> Sent: Monday, May 08, 2006 9:51 AM
> To: [log in to unmask]
> Subject: Re: [TN] IPC Standard
>
> 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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