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Milling area shorts to internal polygons

Former Member

Hi All

 

I have just had a board come back from manufacture where the top layer is joined to an internal layer around a through plated milling slot.  It seems there is no keepout layer for the internal layers when laying out a board or defining a component package.  It is also not picked up on a DRC check.  I have been using EAGLE for over 10 years and this is the first time the DRC has let me down.  Does anyone know how to put a slot in the board and have it treated like a pad so that it is isolated from the internal layers if it is on a different net?  I can provide a test .SCH and .BRD file to demonstrate if required.

 

Many thanks

 

John (who is about to do some delicate Dremmel work)

  • 0

    On 02/23/2012 06:20 AM, John Chambers wrote:

    Hi All

     

    I have just had a board come back from manufacture where the top

    layer is joined to an internal layer around a through plated milling

    slot.  It seems there is no keepout layer for the internal layers

    when laying out a board or defining a component package.  It is also

    not picked up on a DRC check.  I have been using EAGLE for over 10

    years and this is the first time the DRC has let me down.  Does

    anyone know how to put a slot in the board and have it treated like a

    pad so that it is isolated from the internal layers if it is on a

    different net?

     

    I don't use the milling layer for that very reason.  Everything I need

    cut after the plate-through process gets put on the dimension layer.

    You'll notice that when you add a hole to a board, it places a circle in

    the dimension layer, too.  Polygons get pulled back from dimension elements.

     

    On special boards that have holes that MUST NOT be plated through, I

    include notes to that effect in the README.txt file, and a follow it up

    with a phone call to the CAD department of the board fab house - just to

    make sure they actually open the freakin' file and read it!

     

    John (who is about to do some delicate Dremmel work)

     

    Enjoy the comforting whine of the Dremmel tool.

     

        - Chuck

     

     

  • 0 in reply to dukepro

    Cheers Chuck - I have redefined the slot as a dimension and it all works fine now.

     

    Seems like a fault that should be sorted though - I can see no use for the milling layer as it currently functions.

     

    Regards

     

    John