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EAGLE User Chat (English) top and bottom layers do not line up
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Related

top and bottom layers do not line up

autodeskguest
autodeskguest over 15 years ago

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

 

 

 

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  • autodeskguest
    autodeskguest over 15 years ago

    You set whether the bottom layer is mirrored in the cam job,

    The default is reversed.

     

    Happy Monday,

     

    Doug

     

     

    "vadryn P" <vadrynpierre@gmail.com> wrote in message

    news:hhbdg5$lcs$1@cheetah.cadsoft.de...

    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

     

     

     

     

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  • autodeskguest
    autodeskguest over 15 years ago in reply to autodeskguest

    Quote:

    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.

     

    You set whether the bottom layer is mirrored in the cam job,

    The default is reversed.

     

     

    It could also be an offset in either layer.  Make sure that offset is set

    to zero.

     

    Cheers,

     

    James.

    --

    James Morrison  ~~~  Stratford Digital

     

    email:  james@eaglecentral.ca

    web: http://www.eaglecentral.ca

     

    Specialising in CadSoft EAGLE

    • Online Sales to North America

    • Electronic Design Services

    • EAGLE Enterprise Toolkit

    --

    Browser access to CadSoft Support Forums at http://www.eaglecentral.ca

     

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  • autodeskguest
    autodeskguest over 15 years ago

    Doug schrieb:

     

    You set whether the bottom layer is mirrored in the cam job,

    The default is reversed.

     

    That's a very bad default. Obviously it has not been fixed, though it's

    an issue since several years (and an FAQ meanwhile).

     

    Board houses actually prefer (or even demand) a simple layer stack,

    viewed from the top.

     

    Tilmann

     

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  • autodeskguest
    autodeskguest over 15 years ago

    You set whether the bottom layer is mirrored in the cam job,

    The default is reversed.

    ...

    Board houses actually prefer (or even demand) a simple layer stack,

    viewed from the top.

     

    That is a good reason for having default as mirrored for bottom layer

     

     

     

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  • autodeskguest
    autodeskguest over 15 years ago

    Christen Fihl schrieb:

     

    You set whether the bottom layer is mirrored in the cam job,

    The default is reversed.

    ...

    Board houses actually prefer (or even demand) a simple layer stack,

    viewed from the top.

     

    That is a good reason for having default as mirrored for bottom layer

     

    Hä??

     

    I am explaining why it is better to not mirror anything at all, and you

    answer that's a good reason for mirroring the bottom layer... Does that

    make any sense?

     

    Tilmann

     

     

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  • autodeskguest
    autodeskguest over 15 years ago

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

    Need to rethink when better time

     

    Christen

     

     

     

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  • Former Member
    Former Member over 15 years ago

     

    "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

     

     

     

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  • autodeskguest
    autodeskguest over 15 years ago 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.

     

    --

    Browser access to CadSoft Support Forums at http://www.eaglecentral.ca

     

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  • autodeskguest
    autodeskguest over 15 years ago

    Olin Lathrop schrieb:

     

    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.

     

    That's exactly the problem. The CAM job that comes with EAGLE has

    "mirrored" checked for the bottom layer. Though this has been discussed

    here for several years now, and every then and now people ask this same

    question, that default has not been corrected yet. People simply take

    the CAM job provided with EAGLE and then run into problems.

     

    Tilmann

     

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  • autodeskguest
    autodeskguest over 15 years ago in reply to autodeskguest

    Tilmann Reh wrote on Wed, 30 December 2009 02:31

    The CAM job that comes with EAGLE has "mirrored" checked for the bottom

    layer.

     

    That's a really dumb default since it's opposite of what board houses want.

    It should be the other way around, although it's not a big deal since it's

    easy to change, and you only have to do it once over the lifetime of using

    Eagle.

     

    Quote:

    People simply take the CAM job provided with EAGLE and then run into

    problems.

     

    Well, duh!  Someone who can't be bothered to read the docs or even check

    their gerber files with a free viewer deserves to get the bottom layer of

    their board flipped.

    --

    Browser access to CadSoft Support Forums at http://www.eaglecentral.ca

     

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