Board outline clearance

[Joe]

Hi guys,

I am designing a PCB using Orcad. I need a minimum clearance between
the edge of the board and the closest copper. Supposedly, if I set the
width of the board outline to the double of this value, I would have
exactly my required distance, but I don't (the minimum gap is bigger).
Is it possible to adjust exactly this distance?

Thanks!

 

I am designing a PCB using Orcad. I need a minimum clearance between the edge
of the board and the closest copper. Supposedly, if I set the width of the
board outline to the double of this value, I would have exactly my required
distance, but I don't (the minimum gap is bigger). Is it possible to adjust
exactly this distance?

Use a keepout plane around the edge of the board, set to all layers.

Mark

 

[Roger Gt]

<mountains@iname.com> wrote in message
news:4134ad2b$2$woehfu$mr2ice@giganews.aros.net...
:
: >I am designing a PCB using Orcad. I need a minimum clearance
between the edge
: >of the board and the closest copper. Supposedly, if I set the
width of the
: >board outline to the double of this value, I would have exactly
my required
: >distance, but I don't (the minimum gap is bigger). Is it
possible to adjust
: >exactly this distance?
:
: Use a keepout plane around the edge of the board, set to all
layers.
:
: Mark


The Grid must allow you to hit the value too. If you use a .02
grid, you can't get a .003 clearance.

 

[Dave VanHorn]

Make certain that your board house knows to route to the CENTER of that
line, and not either edge!
--
KC6ETE Dave's Engineering Page, www.dvanhorn.org
Microcontroller Consultant, specializing in Atmel AVR

 

[Joe]

Thank you all guys for your feedback.

I think I'll finally create a free track at the due distance and,
after routing, I'll just delete it (idea taken from first post .

I will tell the manufacturer about the limit of the board.

Thank you all again.

 

I think I'll finally create a free track at the due distance and, after
routing, I'll just delete it (idea taken from first post .

Cool. Give us some feedback tho What version of OrCad are you using, and
doesn't it allow you to place a keepout layer? I am not that familiar with
all the latest itterations of OrCad.

Thanks,

Mark

 

[qrk]

On 31 Aug 2004 09:32:38 -0700, Bishionario@hotmail.com (Joe) wrote:

Hi guys,

I am designing a PCB using Orcad. I need a minimum clearance between
the edge of the board and the closest copper. Supposedly, if I set the
width of the board outline to the double of this value, I would have
exactly my required distance, but I don't (the minimum gap is bigger).
Is it possible to adjust exactly this distance?

Thanks!

Half of the board outline width sets the clearance distance on any
plane layer. Your DRC will check for objects that are half the board
outline thickness plus the clearance distance set in your route
spacing spreadsheet. If your using copper pours near the edge of the
board, then you will need to consider what you are using for the
copper pour clearance.

Mark