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How to Export Gerber files from Eagle

This article is originally from build-electronic-circuits.com, written by Øyvind Nydal Dahl. This article has explains how to export Gerber file from Eagle in a very simple and lucid manner. Thus we have utilized this article into our blog to provide better assistance to our customers. To visit the original article, please click here.

A Gerber file for each section of your electronic circuit design is what you need if you want to create a PCB.

In this Gerber tutorial, I will teach you how to create the files you need for a 2-layer board using Cadsoft Eagle. After you have completed this tutorial you will have all the necessary files needed to send to most PCB manufacturers.

Step 1: Open the CAM Processor

In Eagle, open Board view. Click the “CAM” button or choose “File->CAM Processor”. This will open the CAM Processor tool that is used to generate the files.

Here you can define the sections you want to create files for.

But you don’t really need to understand this. Actually I have never really thought about the details of this until I was writing this article. I have just been using ready-made configurations. And that is probably what you want to do as well.

Step 2: Open a predefined job

To simplify creating Gerber files, Eagle comes with a predefined job for this. It is called gerb274x.cam.

To open it in the CAM Processor click “File->Open->Job…”

Browse to your …/eagle/cam/ folder, and you should see a file called gerb274x.cam. Choose it and click “Open”.

You will now see five tabs in the CAM Processor. Each of these tabs will generate a Gerber file.

Step 3: Adding a second silk screen (Optional)

If you look at the tabs, you will see that you don’t have a file for the silk screen bottom. For simple boards, the silk screen is usually on the top layer so that you don’t need the bottom. Some of the cheap circuit board manufacturers don’t even allow bottom silk screen.

But if you need silk screen on bottom layer as well, follow these steps:

  • Click “Add”
  • Change Section to something like “Silk Screen SOL”
  • Change File to “%N.pls”
  • Deselect all layers
  • Select layers 20 “Dimension”, 22 “bPlace” and 26 “bNames”

There you go.

Step 4: Process the job

Select where you want to put the Gerber files by clicking on the “File” button and choosing a folder. Do this for all the tabs.

Then click “Process Job”. This creates your Gerber files.

Step 5: Adding file for drill holes

Even though drilling is supported by the Gerber format, manufacturers usually want the Excellon file format for specifying drill holes. Fortunately for the users, Eagle also comes with a predefined job for creating a drill file.

Open it in the CAM Processor by clicking “File->Open->Job…”

Browse to your …/eagle/cam/ folder, and open the file named “excellon.cam”.

Select where to put the output file by clicking on the “File” button.

Then click “Process Job” to create your Excellon file.

Step 6: Check output files

You should now have the following files:

  • *.cmp (Copper, component side)
  • *.drd (Drill file)
  • *.dri (Drill Station Info File) – Usually not needed
  • *.gpi (Photoplotter Info File) – Usually not needed
  • *.plc (Silk screen, component side)
  • *.pls (Silk screen, solder side)
  • *.sol (Copper, solder side)
  • *.stc (Solder stop mask, component side)
  • *.sts (Solder stop mask, solder side)

After you have created your files, you should always look at them using a Gerber viewer to make sure everything is fine.