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top and bottom layers do not line up

autodeskguest

Hi all,

 

I printed out cam files using the cam processor. When I viewed the files in

gerbviewer i noticed that the layers do not line up. I am not sure why but

the board houses refuse to make the boards because the drills end up going

through the wrong place. For example, the bottom layer ends up reversed and

the top layer remains the same. So the drill holes and solder mask on the

bottom layer are not at the right location. Thanks a lot guys for your help.

Thanks in advance.

 

vp

 

 

 

Parents

  •  

    "Christen Fihl" <look_at_HSPascal.fihl.net@nospam.plz> wrote in message

    news:hhcq40$gql$1@cheetah.cadsoft.de...

    Ups, maybe I got my mind upside down, myself image

    Need to rethink when better time

     

    Christen

     

     

    Kind of gets confusing...!  Think looking through the top to the bottom.

    But YES, this board house in particular would love for that default to be

    changed.  We do check them coming in but would prefer the bottom (or any

    layer) not to be mirrored.

     

    Terri

     

     

     

Reply

  •  

    "Christen Fihl" <look_at_HSPascal.fihl.net@nospam.plz> wrote in message

    news:hhcq40$gql$1@cheetah.cadsoft.de...

    Ups, maybe I got my mind upside down, myself image

    Need to rethink when better time

     

    Christen

     

     

    Kind of gets confusing...!  Think looking through the top to the bottom.

    But YES, this board house in particular would love for that default to be

    changed.  We do check them coming in but would prefer the bottom (or any

    layer) not to be mirrored.

     

    Terri

     

     

     

Children
  • in reply to Former Member

    Terri Miller wrote on Tue, 29 December 2009 15:48

    Kind of gets confusing...!  Think looking through the top to the

    bottom.

    But YES, this board house in particular would love for that default to

    be

    changed.  We do check them coming in but would prefer the bottom (or

    any

    layer) not to be mirrored.

     

    The reason this is confusing is because you guys are not giving a reference

    for "mirrored".

     

    What board houses want is for all the Gerber files to have the same origin

    and the same orientation as if you are looking thru the board from the top

    with xray vision to see the stack of layers.  In other words, layer 1 is

    written to the Gerber file normally.  The bottom layer is written as it

    would appear looking thru the board from the top.  This is the mirror image

    of what it would look like if you were holding the board and looking at the

    bottom layer.  Whether you call this "mirrored" or not I have no idea.

     

    I just checked a canned CAM processor job I have, and apparently Eagle's

    reference is the same as what board houses want, meaning all layers are as

    if viewed thru the board with the top layer up.  You don't want any of the

    Mirror, Rotate, or Upside down boxes checked.  If any of these are the

    default, then that's just wrong.  It's been a long time since I set up

    template CAM jobs that I don't remember if the Eagle defaults had these

    boxes unchecked, or I unchecked them many years ago once.

     

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