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restrict not respected

autodeskguest

I have a 4 layer board that will have a large half inch hole drilled

through it for connector/wire pass through.  I have not placed a 'hole'

there because it is too large for the board house' I'll drill it myself.

  I've drawn circles in the tRestrict, bRestrict and vRestrict layers to

keep traces out of the hole area.  The GND layer is a pologon named GND

and grounds route around the hole fine.

 

The first few times I auto routed the board the restrict circles were

respected - no traces were placed inside them.  After working with the

board for a while the auto router now places traces and vias inside the

restrict circles.

 

I haven't changed the circles or layer definitions, just added parts and

moved things around.  It's a pretty dense board and routing is done in

top, bottom and vcc layers to get everything connected.

 

So I'm guessing either I've messed up some other parameter that turns

off the effect of the restrict circles or perhaps the board cannot be

routed without violating them??

Any thoughts appreciated.

 

Jim

 

Jim White

jim@coloradosatelite.com

 

Parents

  • The way I worked around this was to place z width circles in trestrict,

    vrestrict and brestrict. Then I put a circle in my ground plane, which

    was filled. Then routed the board and deleted that circle in the ground

    plane.  That gets me a nice clean spot in the board where I can drill

    the hole, or use a Dremel tool to mill it out.

    Jim

     

    Richard Hammerl wrote:

    Jim White schrieb:

    I've drawn zero width circles in top, bottom, vcc (used for routing) and

    GND. That prevents routing in the circle in all four layers.  However

    drawing a zero width circle in the GND layer which is filled with a

    polygon ground plane results in that hole (circle) being filled with

    copper.

    So the question now is how to make a large hole in a polygon ground plane?

     

    Jim

     

    Why not draw a circle with a very fine width of for example

    0.001 inch in the inner layer? The polygon keeps its clearance

    to the circumference and the inner part will be kept copper

    free, if the polygon parameter "orphans" is set "off".

     

    Basically bigger holes are not drilled but milled. You could

    draw the same circle in the Milling layer (46) and tell the

    board manufacturer that in layer 46 are milling contours to

    be taken in consideration.

     

     

     

     

Reply

  • The way I worked around this was to place z width circles in trestrict,

    vrestrict and brestrict. Then I put a circle in my ground plane, which

    was filled. Then routed the board and deleted that circle in the ground

    plane.  That gets me a nice clean spot in the board where I can drill

    the hole, or use a Dremel tool to mill it out.

    Jim

     

    Richard Hammerl wrote:

    Jim White schrieb:

    I've drawn zero width circles in top, bottom, vcc (used for routing) and

    GND. That prevents routing in the circle in all four layers.  However

    drawing a zero width circle in the GND layer which is filled with a

    polygon ground plane results in that hole (circle) being filled with

    copper.

    So the question now is how to make a large hole in a polygon ground plane?

     

    Jim

     

    Why not draw a circle with a very fine width of for example

    0.001 inch in the inner layer? The polygon keeps its clearance

    to the circumference and the inner part will be kept copper

    free, if the polygon parameter "orphans" is set "off".

     

    Basically bigger holes are not drilled but milled. You could

    draw the same circle in the Milling layer (46) and tell the

    board manufacturer that in layer 46 are milling contours to

    be taken in consideration.

     

     

     

     

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