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Gerber files - mirror option

Former Member

 

When I use the default gerb274x cam processor for the solder side

layers the 'Mirror' option is set. This makes verifying the produced

gerbers difficult as the layers don't sit correctly on each other.

 

Is this required by board-houses ?

If I switch Mirror off for verification and forget to re-run the

cam processor with Mirroring on will I get a non-functional board ?

 

Markus

 

Parents

  • Markus Baertschi wrote:

    T.Strothmann wrote:

    Never had any problems with unmodified (non-mirrored) data. Many years

    ago I used to mirror the bottom layer, no problems either. In theory

    you should be able to send out anything you want as long as you

    describe all details of the chosen format to the boardhouse, and as

    long as they accept it. But maybe it reduces the likelihood of

    mistakes somewhat, if you stick to an "all layers in the same format"

    scheme.

     

    T.

     

    I can see your point. But the gerb274x.cam file by default does mirror

    the bottom layers. At the same time board houses say you should

    carefully examine the gerbers, which seems somewhat contradictory as you

    can not verify your gerbers if half of them are the wrong way round.

     

    Way back when eagle was started you would be using film and need the

    emulsion next to the PCB photo resist layer. So it needed to be printed

    mirrored. Most of the time the Gerbers (HPGL possibly) went from the

    disk to the photo/pen plotter without having (much of) a computer

    available to mirror the layer.

    I did not see any remarks about this in any of the tutorials and am just

    wondering if there is a consensus about thet.

     

    Markus

    This is more of a legacy default and I have unchecked the mirror on my

    cam files I use.

     

    Paul R.

     

Reply

  • Markus Baertschi wrote:

    T.Strothmann wrote:

    Never had any problems with unmodified (non-mirrored) data. Many years

    ago I used to mirror the bottom layer, no problems either. In theory

    you should be able to send out anything you want as long as you

    describe all details of the chosen format to the boardhouse, and as

    long as they accept it. But maybe it reduces the likelihood of

    mistakes somewhat, if you stick to an "all layers in the same format"

    scheme.

     

    T.

     

    I can see your point. But the gerb274x.cam file by default does mirror

    the bottom layers. At the same time board houses say you should

    carefully examine the gerbers, which seems somewhat contradictory as you

    can not verify your gerbers if half of them are the wrong way round.

     

    Way back when eagle was started you would be using film and need the

    emulsion next to the PCB photo resist layer. So it needed to be printed

    mirrored. Most of the time the Gerbers (HPGL possibly) went from the

    disk to the photo/pen plotter without having (much of) a computer

    available to mirror the layer.

    I did not see any remarks about this in any of the tutorials and am just

    wondering if there is a consensus about thet.

     

    Markus

    This is more of a legacy default and I have unchecked the mirror on my

    cam files I use.

     

    Paul R.

     

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