draw pimitives (lines) on the planes around the perimeter to exclude
copper in those areas
the keepout doesn't limit the plane copper
you generally want more than a few mils back off from the boundary, we
usually place a 50 mil line on the center of the outline on the plane
layer
we generally do not use the keepout for the outline, sometimes they
coincide, sometimes you want the keepout a little smaller or just
different
to avoid redrawing all the plane primitives just copy them and paste on
current layer (the other plane(s)
the keepout generally, at least for us, has no significance to the board
shop
good luck
Dennis Saputelli
Robison Michael R CNIN wrote:
>
> hello,
>
> we're duplicating some legacy boards. in order to avoid flight testing i
> hand-routed the traces to match the old artwork. i believe that i just
> came close to making a SERIOUS mistake. i used the pcb wizard to
> generate the board but then hand-editted the various notches in it. the
> keepout was in the way and i was going to hand rout everything so i
> deleted it.
>
> there is a power and ground plane on this board and there are machined
> metal card guides that get mounted to the board. does this sound ugly?
> i'm thinking (i know that's rare ;-) that by deleting the keepoutlayer i've
> let the planes come right out to the edge of the board. is this correct?
> if so, i've created a potential short between power and ground when the
> card guides are attached to the board.
>
> i put the keepoutlayer back on there, but i'm nervous. when i add the
> power plane to the viewable layers, the only place it is evident is around
> the pads and vias, where a dark green edge appears to isolate them.
> pads that are supposed to be tied to power have a broken circle out
> away from them a bit. but the dark green vcc "void" hasn't appeared
> outside my keepoutlayer. i get the feeling that putting the keepoutlayer
> back in there has not cured my problem.
>
> my questions:
>
> 1. the dark green i'm seeing represents the "negative", or holes, in the
> power plane, correct?
>
> 2. after simply drawing the keepoutlayer back in, i am not seeing the
> dark green power plane void outside the keepoutlayer. does this mean
> that i still have the power plane running right to the board edge?
>
> 3. without a keepoutlayer do the planes extend right to the board edge?
>
> 4. how do i recess the power and ground planes back in a few mils on
> this board?
>
> 5. can i visibly see the planes recessed back from the card edge in protel
> or do i need to generate gerbers and use camtastic to do that?
>
> thank you, miker
--
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