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I am from pcbgogo, a PCB manufacturer.

We make the PCBs from Gerber files and sometimes our customers send us Eagle files so we need to export the Gerber files from their Eagle PCB file.
Recently when I tried to export the Gerber I found that the Bottom Silkscreen was missing and I don't know why.
My client said that there is a Bottom Silkscreen layer in his Eagle document, but I am unable to get it to export.

Can anyone show me where I am going wrong, or what I am supposed to be doing?

Any help will be appreciated.

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    \$\begingroup\$ Why don't you ask your customer to generate the missing bottom silkscreen Gerber and send it to you? \$\endgroup\$ – Leon Heller Aug 19 '16 at 9:25
  • \$\begingroup\$ finaly he send me the gerber file with bottom silkscreen,but he said when exported gerber,he find the drilling data didn't match the pads......haha, so there i just want to know why ,why exist such a situation about the silkscreen. \$\endgroup\$ – gogoivy Aug 23 '16 at 6:40
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First, you need to select the CAM Processor I am sure you will know already (Kinda looks like a camera in the toolbar - see image below)
enter image description here
And then it should open a screen the same or similar to the one below:
enter image description here
Now you can either add each layer manually, or Eagle does have some default Gerber generators that you can use. If you click on File->Open->Job, you can select either 'Gerber' or 'Gerber274x' (see images below).
enter image description here enter image description here
If you create the layer yourself you just need to press 'Add' in the bottom right of the screen and give it a name that means something to you, and the correct extension (I assume you know this being a PCB house) but it typically is '.GBO' for the bottom silkscreen (gerber bottom overlay).
Then on the right hand side of the screen you need to select the layers that it will extract the Gerber from - in your case I imagine it will be something like 'bDocu' or 'bPlace' or 'bNames' or all of them. You might want to confirm with your client about this if you don't know, below is what it should look like.
enter image description here
Once you've done this, if you click on process job / process selection, it will create your Gerber file for you. This will be put in your project directory, and you can then view it using a Gerber viewer.

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  • \$\begingroup\$ the layer you are looking for is typically called bPlace in Eagle, customer really needs to specify though \$\endgroup\$ – vicatcu Aug 20 '16 at 2:01
  • \$\begingroup\$ yes, my customer told me the bottom silkscreen in the bPlace......,but i can't export it successfully anyway.. \$\endgroup\$ – gogoivy Aug 23 '16 at 6:43
  • \$\begingroup\$ @gogoivy is there actually anything on that layer though? Turn off all of the layers except that and check \$\endgroup\$ – MrPhooky Aug 23 '16 at 8:47

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