Board outline clearance

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!

 

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

Mark

 

:
: >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.

 

Make certain that your board house knows to route to the CENTER of that
line, and not either edge!

 

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.

 

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

 

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